Confined bubble growth during flow boiling in a mini/micro-channel of rectangular cross-section Part I: Experiments and 1-D modelling

被引：56

作者：

Gedupudi, S. ^{[1
]}

Zu, Y. Q. ^{[2
]}

Karayiannis, T. G. ^{[1
]}

Kenning, D. B. R. ^{[1
]}

Yan, Y. Y. ^{[2
]}

机构：

[1] Brunel Univ, Sch Engn & Design, London UB8 3PH, England

[2] Univ Nottingham, Sch Built Environm, Nottingham NG7 2RD, England

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2011年 / 50卷 / 03期

基金：

英国工程与自然科学研究理事会;

关键词：

Confined bubble growth; Flow boiling; Microchannel; Pressure fluctuation; HEAT-TRANSFER; PRESSURE-DROP; MICROCHANNELS; PREDICTION; DIAMETER; SIZE; TUBE;

D O I：

10.1016/j.ijthermalsci.2010.09.001

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Heat sinks using evaporation in arrays of parallel microchannels have potential for the removal of high heat fluxes from small areas. They suffer from flow instabilities and uneven distribution between channels that may cause local dryout and overheating. The current state of the art is reviewed critically. A simple 1-D model for bubble growth in a single channel with a compressible volume in its upstream plenum is developed as a tool for the rational design of measures known to reduce flow instabilities, namely inlet resistance and enhanced nucleation in every channel. The model considers two stages of partially and fully confined bubble growth in a single channel of rectangular cross-section, suggested by experimental observations, followed by venting of vapour to the downstream plenum. The experiments also show the influence of apparently minor changes in rig design and operation on upstream compressibility and flow reversal. The model considers upstream compressibility due to subcooled boiling in a preheater or trapped non-condensable gas and the reduction of flow reversal by inlet resistance. The feasibility of measuring transient axial variations in pressure within small channels using inexpensive transducers is demonstrated. (C) 2010 Elsevier Masson SAS. All rights reserved.

引用

页码：250 / 266

页数：17

共 32 条

[1]

Agostini B, 2008, INT J HEAT MASS TRAN, V51, P5400, DOI 10.1016/j.ijheatmasstransfer.2008.03.006

[2]

BOGOJEVIC D, INT J THERM IN PRESS

[3] A novel time strip flow visualisation technique for investigation of intermittent dewetting and dryout in elongated bubble flow in a microchannel evaporator [J].

Borhani, Navid ;

Agostini, Bruno ;

Thome, John Richard .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2010, 53 (21-22) :4809-4818

[4] Pressure drop and heat transfer analysis of flow boiling in a minichannel: influence of the inlet condition on two-phase flow stability [J].

Brutin, D ;

Tadrist, L .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2004, 47 (10-11) :2365-2377

[5] Experimental study of unsteady convective boiling in heated minichannels [J].

Brutin, D ;

Topin, F ;

Tadrist, L .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2003, 46 (16) :2957-2965

[6] The effect of tube diameter on vertical two-phase flow regimes in small tubes [J].

Chen, L. ;

Tian, Y. S. ;

Karayiannis, T. G. .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2006, 49 (21-22) :4220-4230

[7] A heat transfer model for evaporation of coalescing bubbles in micro-channel flow [J].

Consolini, L. ;

Thome, J. R. .

INTERNATIONAL JOURNAL OF HEAT AND FLUID FLOW, 2010, 31 (01) :115-125

[8]

GEDUPUDI S, 2009, P 7 ASME C NAN MICR

[9] A comprehensive flow regime map for microchannel flow boiling with quantitative transition criteria [J].

Harirchian, Tannaz ;

Garimella, Suresh V. .

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER, 2010, 53 (13-14) :2694-2702

[10] Scale effects on flow boiling heat transfer in microchannels: A fundamental perspective [J].

Kandlikar, Satish G. .

INTERNATIONAL JOURNAL OF THERMAL SCIENCES, 2010, 49 (07) :1073-1085

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