Flow boiling of halogenated olefins inside a square cross-section microchannel

被引：11
作者：
Bortolin, Stefano [1 ]
Azzolin, Marco [1 ]
Del Col, Davide [1 ]
机构：
[1] Univ Padua, Dipartimento Ingn Ind, Via Venezia 1, I-35131 Padua, Italy
来源：
SCIENCE AND TECHNOLOGY FOR THE BUILT ENVIRONMENT | 2016年 / 22卷 / 08期
关键词：
HEAT-TRANSFER; PRESSURE-DROP; R1234YF; DEPARTURE; MIXTURE; DRYOUT; MODEL; R134A; TUBE;
D O I：
10.1080/23744731.2016.1229530
中图分类号：
O414.1 [热力学];
学科分类号：
摘要：
New experimental heat transfer coefficients measured during flow boiling of HFO-1234ze(E) and HFO-1234yf inside a square cross-section microchannel having a hydraulic diameter of 1.23mm are presented. The test runs have been performed with mass flux ranging between 200 and 500kg m(-2) s(-1) and heat flux between 20 and 170 kW m(-2). The local heat transfer coefficients are compared against the values previously measured using the same refrigerants in a 1mm diameter tube, with the aim of highlighting the effect of the noncircular shape of the cross-section. The experimental data are compared against predicting models available in the literature to suggest possible design methods for evaporators adopting hydrofluoroolefins in microchannels.
引用
收藏
页码：1238 / 1253
页数：16
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