Experimental investigation of carbon dioxide flow boiling in a single microchannel

被引：13

作者：

Keniar, Khoudor ^{[1
]}

Mazzelli, Federico ^{[2
]}

Garimella, Srinivas ^{[1
]}

机构：

[1] Georgia Inst Technol, GWW Sch Mech Engn, Sustainable Thermal Syst Lab, Atlanta, GA 30332 USA

[2] Univ Firenze, Dept Ind Engn, Via S Marta 3, Florence, Italy

来源：

INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER | 2020年 / 159卷

关键词：

Evaporation; Microchannels; Carbon dioxide; Experiments; HEAT-TRANSFER; GENERAL CORRELATION; VERTICAL TUBES; PRESSURE-DROP; MODEL;

D O I：

10.1016/j.ijheatmasstransfer.2020.120100

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

Carbon dioxide (CO2) is an ideal low Global Warming Potential (GWP) working fluid, and has the potential to increase the efficiency of heat pumps and other thermal systems. Further benefits can be harnessed by using microchannel components to realize compact systems. Saturated flow boiling of CO2 in a single microchannel with a hydraulic dimeter of 1.55 mm is investigated here. The effects of mass flux, quality, heat flux, and reduced pressure on evaporation are considered over the range 100 < G < 500 kg m(-2) S-1; P-red = 0.70, 0.81; 15 < q '' < 72 kW m(-2) and 0.15 < x(v) < 0.8. Heat transfer coefficients increase with an increase in reduced pressure and heat flux, an indication that nucleate boiling may be an important mechanism for the conditions tested. Good agreement of the data (absolute average deviation of 8.8%) was achieved with a correlation developed in this study for these conditions. (C) 2020 Elsevier Ltd. All rights reserved.

引用

页数：9

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