Flow Boiling in Expanding Microchannels

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Beschreibung

This Brief presents an up to date summary of details of the flow boiling heat transfer, pressure drop and instability characteristics; two phase flow patterns of expanding microchannels. Results obtained from the different expanding microscale geometries are presented for comparison and addition to that, comparison with literatures is also performed. Finally, parametric studies are performed and presented in the brief. The findings from this study could help in understanding the complex microscale flow boiling behavior and aid in the design and implementation of reliable compact heat sinks for practical applications.



Explains the effect of expanding microchannel geometries on flow boiling instabilities and hotspot mitigation;

Improves fundamental understanding of flow boiling behavior in microscale geometries;

Performs parametric studies with systematic high speed visualizations;

Presents an evaluation of the effect of expanding microchannel heat sink for scaled up geometries.



Autorentext

Poh-Seng Lee is Associate professor in the Department of Mechanical Engineering, at the National University of Singapore, Singapore.

Tamanna Alam is a Post-doctoral research fellow in the Department of Mechanical Engineering, University of South Carolina, SC, USA.



Inhalt
Chapter 1: Introduction 1.1 Background 1.2 Objectives References Chapter 2: Flow Boiling Heat Transfer and Pressure Drop Characteristics in Expanding Microgap Channel 2.1 Experimental Setup and Procedure <2.2 Bubble characteristics in flow boiling expanding microgap heat sink 2.3 Comparison of pressure drop between expanding microgap heat sinks 2.4 Comparison of boiling curves between expanding microgap heat sinks 2.5 Comparison of local flow boiling heat transfer coefficient between expanding microgap heat sinks 2.6 Comparison of microgap heat transfer coefficient data with literature 2.7 Comparison of wall temperature uniformity between expanding microgap heat sinks 2.8 Conclusions References Chapter 3: Flow Boiling Instabilities in Expanding Microgap Channel 3.1 Mass flux effects on flow boiling instabilities in expanding microgap channel 3.2 Heat flux effects on flow boiling instabilities in expanding microgap channel 3.3 Microgap size effects on flow boiling instabilities in expanding microgap channel 3.4 Conclusions References Chapter 4: Flow Boiling Heat Transfer, Pressure Drop and Instabilities in Straight and Expanding (Sloping Fin) Microchannels - A Comparative Study 4.1 Experimental Setup and Procedure 4.2 Flow boiling regimes and bubble dynamics in straight and sloping fin microchannels 4.3 Comparison of boiling curves between straight and sloping fin microchannels 4.4 Comparison of heat transfer coefficients between straight and sloping fin microchannels 4.5 Comparison of pressure drops between straight and sloping fin microchannels 4.6 Comparison of instabilities between straight and sloping fin microchannels 4.7 Conclusions References Chapter 5: Flow Boiling Performance in Scaled Up Expanding Channel Geometries: Stepped Fin Minichannels 5.1 Experimental Setup and Procedure 5.2 Comparison of boiling curves between straight and stepped fin minichannels 5.3 Comparison of heat transfer coefficients between straight and stepped fin minichannels 5.4 Comparison of pressure drops between straight and stepped fin minichannels 5.5 Comparison of wall temperature uniformity between straight and stepped fin minichannels 5.6 Conclusions References Chapter 6: Closure Appendix A: Uncertainty Analysis Appendix B: Data Reduction

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Produktinformationen

Titel
Flow Boiling in Expanding Microchannels
Autor
EAN
9783319550312
ISBN
978-3-319-55031-2
Format
Kartonierter Einband
Herausgeber
Springer, Berlin
Genre
Technik
Anzahl Seiten
82
Gewicht
162g
Größe
H5mm x B237mm x T165mm
Jahr
2017
Untertitel
Englisch
Auflage
1st ed. 2017
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