Progress and Trends in Rheology II: Proceedings of the Second Conference of European Rheologists, Prague, June 17–20, 1986

513 Pages·1988·15.601 MB·English

by  Prof. Dr. C. Huet (auth.), Prof. Dr. Hanswalter Giesekus, Mark Francis Hibberd Ph. D. (eds.)

Progress and Trends in Rheology II
ro
SUPPLEMENT RHEOWGICA ACTA (1988)
Editor: H. Giesekus (Dortmund)
Progress and Trends in Rheology II
Proceedings of the Second Conference of
European Rheologists, Prague, June 17 - 20, 1986
Editors: H. Giesekus, M. F. Hibberd (Dortmund, FRG)
in co-operation with
P. Mitschka, R. Ibba, and J. Sestâk (Prague, CSSR)
Springer-Verlag Berlin Heidelberg GmbH
ISBN 978-3-642-49339-3 ISBN 978-3-642-49337-9 (eBook)
DOI 10.1007/978-3-642-49337-9
ISSN 0035-4511
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Preface
Following an invitation from the Czechoslovakian The scientific programme consisted of 14 plenary
delegates at the First Conference of European Rheo lectures as weIl as 310 short presentations, which were
logists at Graz in 1982 and adecision by the European held in six parallel sessions in seven half-day sittings.
members of the International Committee of Rheology The provision of a reading room containing submitted
at the 1983 "Conference of Engineering Rheology" in manuscripts of talks presented at the meeting proved
London, the Rheology Group of the Czechoslovak to be popular and seems a worthwhile addition to any
Chemical Society (Chairman: Doz. lug. l. Sestak meeting, at least those holding parallel sessions. There
CSc.) was entrusted with the organization of the Sec was also a display by nine companies of a wide variety
ond Conference of European Rheologists. For an of current rheological instruments.
outline of the process leading to the decision to hold The programme for accompanying persons befitted
such European meetings, see the Introduction to the the historical significance of the region. The evening
Proceedings of the First Conference of European programme included an opening ceremony and recep
Rheologists; Rheol Acta 21:355-356 (1982). tion on Monday and an informal banquet on Thurs
This Conference was held in the Prague Palace of day as weIl as a visit to the opera. The warm
Culture from the 17th to 20th of lune 1986 und er the Czechoslovakian hospitality encouraged many smaller
auspices of the Institute of Hydromechanics of the get-togethers; an important aspect of such meetings.
Czechoslovak Academy of Sciences, Prague (Director: The desirability of further European activities was
lug. A. Curev DrSc., President of the Conference). discussed at a meeting of the representatives of Euro
lug. P. Riha CSc. and lug. P. Stern CSc. from the same pean Rheology Societies in the International Commit
institute were responsible for the planning and tee of Rheology (Chairman: Dr. Petrie, Newcastle
preparation of the meeting, ably aided by many upon Tyne, u.K.), at which it was decided that the
assistants. The Programme Committee was headed by Third European Rheology Conference should be held
lug. P. Mitschka CSc. from the Institute of Chemical in England in 1990.
Process Fundamentals of the Czechoslovak Academy These proceedings contain seven invited papers in
of Sciences, Prague. full and two in abriqged form, and short versions of
More than 400 scientists from 30 co.untries as weIl 166 contributed papers. Because of the necessity to
as 45 accompanying persons participated in the Con restrict the number of pages, as a rule, no papers are
ference and associated social events. In contrast to the added which were only submitted but not presented at
First European Conference, there was happily a strong the conference, and we have also not appended a list
participation by scientists from Eastern European of those papers presented as lectures but not included
countries and in particular from the host country. in this volume.
Prof. Dr. Hanswalter Giesekus Mark Francis Hibberd, Ph. D.
Executive Editor Co-Editor
lug. Pavel Mitschka CSc. lug. Pavel Riha CSc. Doz. lug. Jifi Sestlik CSc.
Programme Secretary Secretary General Chairman of the
of the Conference of the Conference Czechoslovak rheology Group
Contents
v
Preface ............................................................................................
Contents ........................................................................................... VII
INVITED PAPERS
Huet C: Some basic principles in the thermorheology of heterogeneous materials
Petrie CJS: Some remarks on the stability of extensional flows ........................................... 9
Giesekus H, Hibberd MF: On the structure of turbulent flow of drag reducing fluids ........................ 15
Metzner AB: Rheology of liquid crystalline polymers .................................................... 17
Sestak J: Phenomenological rheology of thixotropic liquids: a contribution to the needs of engineering science. 18
Malkin AYa: Rheology of oligomer curing .............................................................. 25
Leblanc JL: Recent progress in understanding rubber processing through a rheological approach .............. 32
Sherman P: Rheological evaluation of the textural properties of foods ..................................... 44
Stoltz J-F: Hemorheology: from theory to c1inical practice ............................................... 54
CONTRmUTED PAPERS (SHORT VERSIONS)
1. Constitutive theory
Betten J: Tensorial generalization of uniaxial constitutive relations ........................................ 62
Mainardi F, Bonetti E: The application of real-order derivatives in linear viscoelasticity ...................... 64
Kosek M: Rheological applications of the electrical-mechanical analogy .................................... 68
Berka L: Mechanics of continuous media with interfaces ................................................. 70
Kafka V: Micromechanics of rheological processes in heterogeneous solids ................................. 73
Sobotka Z: Three kinds of shear asymmetry in rheological bodies ......................................... 76
Borovinskii SV, Mazurin OV: On the concept of volume viscosity ......................................... 79
Konupek J: A new method of c1assifying rheological curves .............................................. 81
Ziabicki A, Jarecki L: Non-linear theory of stress-optical relations in polymer fluids ........................ 83
Otten B, Schümmer P: The influence of hydrodynamic interaction on the constitutive equation of the elastic
dumbbell model ................................................................................... 86
Öttinger HC: The consistently averaged hydrodynamic interaction: a numerical investigation of long chains in
steady shear flow ................................................................................. 89
Carreau PJ, Ait Kadi A, Grmela M: A conformation model for polymer solutions .......................... 91
Maugin GA, Drouot R: Stability of conformations of polye1ectrolytes in flows and electric fields ............. 94
Volkov VS, Vinogradov GV: Non-Markovian dynamics of macromolecules and viscoe1astic phenomena in linear
polymers ......................................................................................... 96
Jongschaap RJJ: Some comments on reptation theories .................................................. 99
Friedrich C, Heymann L: A few remarks on rheological constitutive equations of the network-rupture type .... 102
Mills P, Snabre P: The fractal concept in the rheology of concentrated suspensions .......................... 105
VIII Progress and Trends in Rheology II (1988)
Quemada D, Flaud P: Temperature dependence of characteristic times in rheologieal models of concentrated
suspensions 108
° 0 0 0 0 0 0 000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 0 000 0 0 0 0 0 0 0 0 0 0 000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 0 0 0 0 0 °
Flaud P, Quemada D: Thermorheological properties of dispersions with solid-liquid transition of one component 111
2. Theory of waves, cracks and non-Newtonian fluid f10w
Marinov P, Kiriazov P: On the propagation of temperature with finite wave speed in two-composite linear ther-
moelastie materials 114
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Konczak Z: Propagation of waves due to the action of heat sources in a porous fluid-saturated medium 117
° 0 0 0 0 0 °
Dahan M, Predeleanu M: A ductile crack in an anisotropie solid 120
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Sigli D, Kaddioui N: Combined influence of elasticity and inertia on the flow around a rigid sphere 122
° 0 0 0 0 0 0 0 0 0 °
Bosch HW, Schümmer P: Numerical simulation of Newtonian and non-Newtonian flow through axisymmetric
hyperbolic contractions 124
° 0 0 0 0 0 0 0 0 0 0 0 0' 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
<;aglar ~, Heiter T, Spengler W: Flow of shear-thinning fluids in gaps ° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 0 000 000 0 000 ° 126
Flaman AAM, Veltman B: Injection moulding experiments, achallenge to numerieal simulation programs 129
° 0 0 0 °
Mitsoulis E: Extrudate swell in multilayer polymer flows 131
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
TekiC MN, Petrovic D, Posarac D: Flow of laminar falling films along an inclined wall 134
000000000000000000000 °
Tekic MN, Jovanovic S: The effect of angle on free coating of pseudoplastic liquids 136
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Chan Man Fong CF, Cai F, Xu Y: Flow of a Casson fluid on a rotating disk 138
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Zhu J, Chan Man Fong CF: Flow of Carreau fluids through packed beds 141
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Vincent M, Germain Y, Agassant JF: Numerical and experimental study of the fiber motion in reinforced ther-
moplastic flows 144
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Bossis G, Brady JF: Diffusion of Brownian hard spheres in shear flow 147
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
Stacharska-Targosz J, Gryglaszewski P: Heat transfer in laminar flow of non-Newtonian fluids 148
3. Rheometry
Moos K-H: Mieroprocessors in rheological testing for increasing safety and quality in rubber and plastics pro-
duction and processing 152
000 0 0 0 0 0 0 0 000 0 0 0 0 000 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 0 0 0 0 0 0 0 000 0 000 0 000 0 0 0 0 000 0 0 000 0 0 °
Möller Do The flow behaviour of polymer solutions at high shear rates 154
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Schneider J: Rheometry under non-isothermal conditions 157
00000000000000000000000000000000000000000000000 °
Colmenero J, Alegria A, Macho E: Parallel-plate viscometry of amorphous polymers in the range 104 to 1010 Pa s 159
Bohlin L: New instrumentation for advanced rheometry 161
000000000000000000000000000000000000000000000000 °
Reher E-O, Kärrner R: Rheological characterization of polymer solutions using a disc rheometer 164
° 0 0 0 0 0 0 0 0 0 0 0 0 °
Tomis F, Stoklasa K, Sudnik W: Effect of energy dissipation on flow characteristics 167
° 0 0 0 0 0 0 0 000 0 000 0 0 0 0 0 0 0 0 0 °
Brodkey RS, Cha S-M, Zakin JL: Visual rheologieal studies of slurries 169
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 000 0 0 000 0 0 000
Schlegel D: A new method for determining the wall effects with a Couette viscometer 172
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Mitschka P: Conversion of Brookfield L.YoTo readings into viscosity functions 175
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Kemblowski Z, S<;k J, Budzynski P: Continuous measurements of viscous properties of suspensions with settling
particles 177
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Kramarz J, Porzycka-Semczuk K: Determination of the pour point of lubricating oils using the Mini Rotary
Viscometer 179
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Bauer H, Meerlender G, Stern P: Viscoplastic flow of ternary polymer solutions: applieation as a non-Newto-
nian standard material 181
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Heinz W: Continuous on-line measurement of viscoelastic materials 183
00000000000000000000000000000000000000 °
Van den Brule BHAA, Dijksman JF, Zander PJ: Rheometry of viscoplastie dispersions 186
000000000000000000000 °
Potesil A, Humen V: Transient rheological functions in some plasties 189
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Koyama K, Ishizuka 0: Elongational viscosity of polymer melts using a constant stress rheometer 191
00000000000 °
Schümmer P, Thelen H-G: History effects in elongational flow of polymer solutions 192
00000000000000000000000 °
Holweg J, Brunn PO, Durst F: Investigations of an aqueous surfactant solution by means of a porous medium
rheometer 195
° 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 °
Contents IX
Laven J, Janeschitz-Kriegl H: A calorimetric capillary for the measurement of viscous heating in tube flow of
molten polymers .................................................................................. 197
4. Solid materials
Rehage H, Veyssie M: Rheological properties of two-dimensional model-networks 200
Havranek A: Viscoelastic behaviour of rubbers in the main transition zone ................................. 202
Link G: Creep and recovery of anionkand technical polystyrenes ......................................... 205
Koskova B, Kosek M: Rheological properties of polyester textile fibres ..................................... 210
Privalko VP, Mirontsov LI, Vorona VV: Thermodynamics of deformation of segmented polyurethaneureas ..... 213
Dumoulin MM, Utracki LA, Carreau PJ: Rheological properties of LLDPE/PP blends 1. Dependence of tensile
properties on composition .......................................................................... 215
Yanovsky YuG, Vinogradov GV, Barancheeva VV: Peculiarities of the rheological behaviour of linear flexible
chain polymers with various fillers .................................................................. 218
Hristova J: Creep of dispersely filled composites: influence of concentration and specific surface of the filler ... 221
Milewski G, Mazurkiewicz S: Influence of fatigue, ageing and structure damage of polyamide on its stress relax-
ation behaviour ................................................................................... 223
Malac J: Properties of polymers and compaction of polymeric particulate materials ......................... 226
Muria Vila D, Hamelin P: Polymer concrete under impact loading ........................................ 228
Torrenti JM: An incremental non-linear constitutive model for concrete .................................... 231
Salmen L: Directional viscoelastic properties of wood ................................................... 234
Helinska-Raczkowska L, Poliszko St, Raczkowski J: Stress relaxation in wood under unsteady penetration of
physically active liquids ............................................................................ 236
Kokocinski W, Poliszko St: Prediction of rheological behaviour of wood-polystyrene composites .............. 238
Rigdahl M, Lindström T, Koiseth P: Mechanical properties of filled paper ................................. 240
5. Pure Iiquids and solutions
Migoun NP, Prokhorenko PP: On polar fluid viscosity increase in porous media 244
Hoffmann H, Löbl M, Rehage H: Viscoelastic surfactant solutions: kinetically controlled viscosities ........... 246
Schmitt K, Brunn PO, Durst F: Scaling-up correlations for drag reducing surfactants ........................ 249
Vißmann K: Extensional flow behaviour of dilute polymer solutions after simple shear flow .................. 252
Shibanuma H, Kato H: Energy coefficient in diverging flows of dilute polymer solutions ..................... 255
Rathousky J, Svec J, Klimt P, Brych K: Newtonian and non-Newtonian flow through a bottom orifice ......... 257
Entov VM: Elastic effects in flows of dilute polymer solutions ............................................ 260
Cruz-Mena J, Serrania F, Mena B: Deformation and break-up of viscoelastic drops in creeping flow ........... 262
Cakl J, Machac I, Lecjaks Z: Flow of viscoelastic liquids through fixed beds ............................... 266
Machac I, Mikulasek P, Lecjaks Z: Flow of non-Newtonian liquids through fluidized beds of spherical particles 268
Vatai Gy, Tekic MN: Effect of pseudoplasticity on hydrodynamic characteristics of airlift loop contactors 271
Oliver DR: Load enhancement and friction for polymer solutions lubricating rotating cylindrical surfaces 273
Nikolova AM, Peev GA: Mass transfer in Couette flow of a power-Iaw liquid 277
6. Liquid crystals, dispersions and emulsions
Mufioz J, Rodriguez Garcia JM, Flores V, Gallegos C: Rheology of lyotropic liquid crystals for binary polyoxy-
ethylene fatty a1cohollwater systems. 1. The lamellar mesophase ........................................ 280
Gallegos C, Mufioz J, Rodriguez Garcia JM, Flores V: Rheology of lyotropic liquid crystals for binary polyoxy-
ethylene fatty a1cohollwater systems. II. The hexagonal mesophase ...................................... 282
Vinogradov GV, Deinega YuF: Electrorheology of disperse and polymer systems ............................ 284
Laun HM: Rheological properties of polymer dispersions with respect to shear-induced particle structures ...... 287
Bryk MT, Ageeva IA, Iliyna ZT: Rheological properties of polystyrene dispersions in solutions of polydimethyl-
siloxane in heptane ................................................................................ 290
x Progress and Trends in Rheology II (1988)
Kastanek A, Snuparek J, Pilny M: Flow behaviour of thickened acrylate copolymer dispersions ............... 292
Ryabokon NV, Yemelyanov DN, Myasnikova LI: Rheology of filled polymethacrylates ....................... 295
Simonik J, Drag J, Drexler J: Rheology of dispersions of poly(vinyl chloride) with liquid rubbers ............. 298
Yemelianov DN, Smetanina IYe, Barsukov IA, Volkova NV: The rheology of polymerization processes followed
by phase transition ................................................................................ 300
Giordano JP, Plegue TH, Frank SG, Fruman DH, Zakin JL: A study of concentrated viscous crude oil-in-water
emulsions ........................................................................................ 302
Titkova LV, Yanovsky YuG: Viscoelastic and thixotropie parameters of highly structured grades of petroleum ... 305
Zielinski J, Bukowski A: Application of some rheological methods for determining the properties of polymer-
asphalt composites ................................................................................ 307
Nikolova S, Ivanov Y: Rheological properties of polymer-modified penetration-grade bitumens ................ 309
Attane P, Soucemarianadin A, Prud'Homme JB: Shear and extension al properties of asphalt-polymer binders .. 311
Kotsilkova R, Gidikova M, Ivanov Y: Rheological investigation of compositions of thixotropie disperse systems
for cosmetic purposes .............................................................................. 314
7. Suspensions, slnrries and pastes
Windhab E: A new method for describing the time-dependent rheological behaviour of concentrated suspensions 317
Schreuder FWAM, Stein HN: Rheology of non-coagulating suspensions .................................... 320
MarcinCin A, Zemanova E, Beniska J: Rheological properties and filtration ability of organic pigment disper-
sions in polypropylene ............................................................................. 323
Czaban S, Parzonka W, Havlik V: Non-Newtonian behaviour of kaolin suspensions ......................... 325
Chen ZQ, Xin YCh, Lu ChX: Negative thixotropie behaviour of montmorillonite and hydrolyzed polyacrylamide
system ........................................................................................... 328
Sobolik V: Flow enhancement of non-Newtonian liquids by superposed oscillations ......................... 330
Wein 0, Tovchigrechko VV, Pokryvaylo NA: Wall effects in non-Newtonian fluids ........................... 332
Bouguechal JE, Perrot P, Quemada D: Study of fiber-suspension jets submerged in Newtonian and non-Newto-
nian fluids ....................................................................................... 334
Oolman T, Yu D, Walitza E, Chmiel H: Rheological properties of microbial broths .......................... 336
Pil<it P, Bezdek K: Rheological characterization of the penicillin production process ......................... 339
Rudis M, Jezdinsky V, Seichert L, Ujcova E: Rheometry of Aspergillus niger suspension during fermentation of
citric acid ........................................................................................ 341
Horsley RR, Snow RJ: The rheology of some Australian mine tailings ..................................... 344
Stoyanova G, Ivanov Y, Stoilova L: Rheological properties of raw cement slurries ........................... 347
Rudzinski L, Piasta J: The rheological behaviour of expansive cement pastes ............................... 349
Benbow JJ, Bridgewater J: Recent results on the rheology of particulate pastes ............................. 352
Ivanov Y, Manova S, Kotsilkova R, Krusteva E: Technological classification of toothpaste precipitated silicas 355
8. Polymer melts
Karnis J, Pechoc V: Master flow curve for fibre-forming polypropylenes ................................... 358
Aleman JV: Molecular mechanism of polymer bulk flow ................................................. 360
Valenza A, La Mantia FP, Acierno D: Influence of molecular parameters on the elongational behaviour of dif-
ferent polyethylenes and their blends ................................................................ 365
Diogo AC, Marin G, Monge Ph: Viscoelastic behaviour of a styrene-butadiene-styrene block copolymer melt ... 367
Bye DJ, Miles IS: Rheology of two-phase polymer blends ................................................ 370
Kozlowski M, Wlasinska L: Rheometry of vinyl polymers ............................................... 373
Ki'ivanek J: The influence of polymer matrix viscosity on the relative viscosity of filled polymer melts ......... 375
Gleißle W, Mukherjee D: Measurement of transient and steady-state shear and normal stresses in filled polymers
379
Contents XI
Vinogradov GV, Plotnikova EP, Zabugina MP, Borisenkova EK: Peculiarities of the rheological behaviour of
filled materials in steady shear flow ................................................................. 382
9. Polymer processing
Gurbanov RS, Bakhtiyarov SI, Suleymanov TS: Drag coefficient of viscoelastic flow in channel with cavity 385
Fischer K, Sendner H, Büchner R, Schlesinger A: On the wet spinning process of viscose fibres .............. 388
Kuncova G, Vlcek J, Kubeckova M, Götz J: Flexible self-centering die for coating fibres ..................... 391
Bartos 0, Vlcek J, Plesek M, Kral V: Use of the generalized Maxwell codeformational model for describing
plastic melt behaviour during some flow situations .................................................... 394
Kral V, Vlcek J, Bartos 0, Lednicky Z, Kouba K: Modelling of flow in flat film extrusion heads .............. 397
Grom J, Oravcova A, Cigas P, Krb R: Evaluation of the pipe extrusion process by a rheometrical method ..... 400
Muras J, Janacek Z, DostaJ J: Influence of repeated extrusion on viscoelastic properties and molecular parame-
ters of polyethylene ................................................................................ 402
Tuleshkov N, Djumaliyski S: Extrudate swell of polyvinylchloride melts containing gas bubbles ............... 404
Saha P, Tomis F, Stratil J: Instability phenomena in polymer extrusion .................................... 407
Kozlowski M, Piglowski J: Prediction of thermoforming properties of high-impact polystyrene ................ 409
Kouba K, Bartos 0: Biaxial deformation of viscoelastic membranes in relation to thermoforming ............. 411
Titomanlio G, Piccarolo S, Levati G: Analysis of the packing stage in injection molding of thermoplastic
polymers ......................................................................................... 414
Piccarolo S, Rallis A, Titomanlio G, Brucato V: Effect of some injection molding processing conditions on weid
lines characteristics ................................................................................ 416
Vaganov DA, Zhirkov PV, Malkin AYa: Curing oligomer movement with wall slip in a pipe 418
10. Food rheology and processing
Moldenaers P, Mewis J, Berghmans H: Rheological aspects of gelation in weak gels 420
Lapasin R, Paoletti S, Zanetti F: Rheological investigation of the formation of ionic polysaccharide gels ....... 422
Brownsey GJ, Ridout MJ: The interpenetrating network structure of food gels .............................. 424
Dahme A: Influence of concentration and average molecular weight of high-methoxyl citrus pectin on the elastic
behaviour of pectin gels ............................................................................ 426
Andersson 0, Rubbert H, Schmandke H: Analysis of creep compliance curves of food gels .................. 429
MacInnes WM, Roulet Ph: Dynamic-mechanical properties of starch gels .................................. 431
Senouci A, Siodlak GDE, Smith AC: Extensional rheology in food processing .............................. 434
Isherwood DP, Lai-Fook RA, Senouci A, Smith AC: So me studies on the conveying of foodstuffs in the meter-
ing section of self-wiping co-rotating twin screw extruders .............................................. 437
Tayeb J, Vergnes B: Flow of a molten starch through tpe reverse flight element of a twin screw extrusion cooker 440
Lewicki PP, Skierkowski K: Flow of fruit and vegetable purees through pipelines ............................ 443
Kemblowski Z, Dziubinski M, Pruska-K~dzior A: Recovery of non-Newtonian pastes from a pipeline based on
two-phase flow of gas and liquid in a horizontal pipe ............................................... ,. 446
Filkova I: Optimization of velo city in heat exchangers for power-Iaw fluids ................................. 448
Tscheuschner H-D, Markov E: Rheological properties of chocolate masses and chocolate ..................... 451
Tuma J, Ranny M: Emulsifier's influence on rheology of chocolate ....................................... 453
Stern P, Pokorny J, Davidek J, Cmolik J: Relations between rheological and sensory properties of fat foams ... 457
Masi P, Acierno D: The influence of testing conditions on the compression behaviour of cheese .............. 458
Houska M, Sestak J, Jeschke J, Adam M, Pi'idal J: Rheology of minced meat transportation in pipes ......... 460
Sinevic V, Pipek P, Fort I, Brchelova L: Rheological properties of coarsely minced beef 463
11. Biorheology
Sobotkova E, Hruba A, Kiefman J, Sobotka Z: Rheological behaviour of bone marrow 467
Flaud P, Quemada D: Non-linearviscoelastic model of soft tissue ......................................... 469
XII Progress and Trends in Rheology II (1988)
Geiger D: Mechanical properties of ligaments under uniaxial stresses 473
Stoytchev St, Alexandrov I, Savova A: "In vivo" determination of the rheological properties and atherosclerotic
changes of human aorta ........................................................................... 476
Zeggwagh G, Bellet D: Pulsating flows of non-Newtonian fluids in slowly varying porous tubes of small diameter 478
Reher EO, Vogel R: On modelling the thixotropic-viscoelastic behaviour of human blood .................... '4.ß.}
Antonova N: Relation between the rheological parameters of constitutive equations for blood and its hematocrit 483
Schneditz D, Kenner Th: The influence of red blood cell aggregation and deformability on the viscoelasticity,
erythrocyte sedimentation-rate and density of blood ................................................... 485
Donner M, Caporal P, Siadat M, Muller S, Stoltz J-F: Relations between microrheological and molecular
rheological properties of red blood cells .............................................................. 488
Caprani A, Thmisier L: Behaviour of inert and biological suspensions in a Couette flow: optical and electro-
chemical investigations ............................................................................. 490
Matrai A, Ernst E: Surface rheology of human plasma: observations in conditions with increased blood cell ag-
gregation ......................................................................................... 494
Author Index 497
Subject Index 499