Effects of heat flux, mass flux, vapor quality, and saturation temperature on flow boiling heat transfer in microchannels

被引：141

作者：

Bertsch, Stefan S. ^{[1
,2
]}

Groll, Eckhard A. ^{[1
,2
]}

Garimella, Suresh V. ^{[1
]}

机构：

[1] Purdue Univ, Sch Mech Engn, Cooling Technol Res Ctr, W Lafayette, IN 47907 USA

[2] Purdue Univ, Sch Mech Engn, Ray W Herrick Labs, W Lafayette, IN 47907 USA

来源：

INTERNATIONAL JOURNAL OF MULTIPHASE FLOW | 2009年 / 35卷 / 02期

基金：

美国国家科学基金会;

关键词：

PRESSURE-DROP; 2-PHASE FLOW; DIAMETER; REFRIGERANT; EVAPORATION; R-134A; TUBES; INSTABILITIES; WATER;

D O I：

10.1016/j.ijmultiphaseflow.2008.10.004

中图分类号：

O3 [力学];

学科分类号：

08 ; 0801 ;

摘要：

Flow boiling heat transfer with the refrigerants R-134a and R-245fa in copper microchannel cold plate evaporators is investigated. Arrays of microchannels of hydraulic diameter 1.09 and 0.54 mm are considered. The aspect ratio of the rectangular cross section of the channels in both test sections is 2.5. The heat transfer coefficient is measured as a function of local thermodynamic vapor quality in the range -0.2 to 0.9, at saturation temperatures ranging from 8 to 30 degrees C, mass flux from 20 to 350 kg m(-2) s(-1), and heat flux from 0 to 22 W cm(-2). The heat transfer coefficient is found to vary significantly with heat flux and vapor quality, but only slightly with saturation pressure and mass flux for the range of values investigated. It was found that nucleate boiling dominates the heat transfer. In addition to discussing measurement results, several flow boiling heat transfer correlations are also assessed for applicability to the present experiments. (C) 2008 Elsevier Ltd. All rights reserved.

引用

页码：142 / 154

页数：13