Dryout characteristics during flow boiling of R134a in vertical circular minichannels

被引：38

作者：

Ali, Rashid ^{[1
]}

Palm, Bjorn ^{[1
]}

机构：

[1] Royal Inst Technol, Dept Energy Technol, KTH, SE-10044 Stockholm, Sweden

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2011年 / 54卷 / 11-12期

关键词：

Microchannels; Critical heat flux; Dryout; Flow boiling; Heat transfer; R134a; CRITICAL HEAT-FLUX; LOW-PRESSURE; CHANNEL; BURNOUT; TUBES; WATER;

D O I：

10.1016/j.ijheatmasstransfer.2011.02.018

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

In this paper, the experimental results of dryout during flow boiling in minichannels are reported and analysed. Experiments were carried out in vertical circular minichannels with internal diameters of 1.22 mm and 1.70 mm and a fixed heated length of 220 mm. R134a was used as working fluid. Mass flux was varied from 50 kg/m(2) s to 600 kg/m(2) s and experiments were performed at two different system pressures corresponding to saturation temperatures of 27 degrees C and 32 degrees C. Experimental results show that the dryout heat flux increases with mass flux and decreases with tube diameter while system pressure has no clear effect for the range of experimental conditions covered. Finally, the prediction capabilities of the well known critical heat flux (CHF) correlations are also tested. (C) 2011 Elsevier Ltd. All rights reserved.

引用

页码：2434 / 2445

页数：12

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