Heat Transfer and Pressure Drop in Flow Boiling in Microchannels

63 Pages·2016·2.657 MB·English

by  Sujoy Kumar Saha, Gian Piero Celata (auth.)

SPRINGER BRIEFS IN APPLIED SCIENCES AND TECHNOLOGY
THERMAL ENGINEERING AND APPLIED SCIENCE
Sujoy Kumar Saha
Gian Piero Celata
Heat Transfer and
Pressure Drop in
Flow Boiling in
Microchannels
123
SpringerBriefs in Applied Sciences
and Technology
Thermal Engineering and Applied Science
SeriesEditor
FrancisA.Kulacki,Minnesota,USA
More information about this series at http://www.springer.com/series/8884

Sujoy Kumar Saha (cid:129) Gian Piero Celata
Heat Transfer and Pressure
Drop in Flow Boiling
in Microchannels
SujoyKumarSaha GianPieroCelata
IndianInstituteofEngineering ENEADivisionofAdvancedTechnologies
ScienceandTechnology,Shibpur forEnergyandIndustry
Howrah,India Rome,Italy
ISSN2191-530X ISSN2191-5318 (electronic)
SpringerBriefsinAppliedSciencesandTechnology
ISBN978-3-319-20284-6 ISBN978-3-319-20285-3 (eBook)
DOI10.1007/978-3-319-20285-3
LibraryofCongressControlNumber:2015942518
SpringerChamHeidelbergNewYorkDordrechtLondon
©SpringerInternationalPublishingSwitzerland2016
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Preface
This book discusses heat transfer and pressure drop in flow boiling in
microchannels. The state-of-the-art review has been made. Investigations on heat
transfer and pressure drop in flow boiling in microchannels have been dealt with.
Predictionsofheattransferandpressuredrop,models,andcorrelationshavebeen
discussed in detail. The book ends with conclusion and delineation of further
research.
Howrah,India SujoyKumarSaha
Rome,Italy GianPieroCelata
v

Contents
1 Introduction. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.1 CoolingMethods. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
1.2 TypesofTwoPhaseConvectionModeofHeatTransfer. . . . . . . . 2
1.3 DimensionlessParametersinTwo-Phase. . . . . . . . . . . . . . . . . . . . 2
References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
2 SignificanceofFlowVisualizationinMicrochannels. . . . . . . . . . . . . 5
2.1 Two-PhaseHeatTransferStudies. . . . . . . . . . . . . . . . . . . . . . . . . 7
References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 24
3 PressureDropStudies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
3.1 Micro-ChannelPressureDropBasicEquations. . . . . . . . . . . . . . . 27
3.2 Two-PhasePressureDropPredictionBased
onHomogeneousFlowModel.. . . . .. . . . .. . . .. . . . .. . . . .. . . 29
3.3 Two-PhasePressureDropPredictionBased
onSeparatedFlowModel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
3.4 MitigatingPressureDropOscillations. . . . . . . . . . . . . . . . . . . . . . 40
3.5 VoidFractionSignificance. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 49
3.6 ModelsforPredictingVoidFraction. . . . . . . . . . . . . . . . . . . . . . . 49
References. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
4 ConclusionandFurtherResearch. . . . . . . . . . . . . . . . . . . . . . . . . . . 55
vii

Nomenclature
A Innerarea(m2)
inner
AMP Oscillationamplitude
Cp Thermalcapacity(J/kg(cid:1)C)
D Diameter(mm)
D Innerdiameter(cm)
inner
DP Themaximuminstantpressuredrop(kPa)
max
DP Minimuminstantpressuredrop(kPa)
min
f Frequency(Hz)
f Frictionfactorinlaminarflow
L
f Frictionfactorinturbulentflow
T
FS Fullscale
G Massflux(kg/m2s)
i Theliquidenthalpyatthechannelinlet(J/kg)
in
i Theenthalpyofsaturatedliquidatthesystempressure(J/kg)
l
i Thelatentheatofevaporationatthesystempressure(J/kg)
lv
i i–i (J/kg)
sub l in
i Theenthalpyofsaturatedvaporatthesystempressure(J/kg)
v
I Current(A)
L Tubelength(mm)
L(t) Instantbubblelengthinslugflowattimet(μm)
L(t ) Bubblelengthinslugflowatthereferencetime,t (μm)
0 0
L Heatedlength(cm)
heated
L Bubblelengthratio,L(t)¼L(t )
r 0
M Totalnumberofrecordeddatapoints
MAX Maximumvalue (cid:1) (cid:3)
Npch Subcoolingnumber, Qcvlv
W(cid:1)ilvvl (cid:3)
N i v
sub Phasechangenumber, sub lv
i v
lv l
P Pressure(kPa)
Q00 Heatflux(W/cm2)
ix