期刊
INTERNATIONAL JOURNAL OF HEAT AND MASS TRANSFER
卷 177, 期 -, 页码 -出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijheatmasstransfer.2021.121470
关键词
Supercritical; Carbon dioxide; Heat transfer; Single wall heating; Turbulent flow; Microchannel; Infrared thermography
资金
- National Science Foundation [1604433]
- Directorate For Engineering
- Div Of Chem, Bioeng, Env, & Transp Sys [1604433] Funding Source: National Science Foundation
This study characterized the thermal-hydraulic behavior of carbon dioxide near the critical point in rectangular microchannels with uniform heating limited to a single wall. The experiments revealed that existing supercritical heat transfer correlations developed for uniform wall heating conditions did not accurately predict heat transfer for single wall heating boundary conditions.
This paper characterizes the thermal-hydraulic behavior of carbon dioxide near the critical point in rectangular microchannels with uniform heating limited to a single wall of the flow channel. Experiments were conducted in a horizontal, bottom heated channel with a hydraulic diameter of 923 mu m and an aspect ratio (AR = W-ch/H-ch) of 3.33. Experimental variables included the mass flux (430 <= G <= 800 kg m(-2) s(-1)), heat flux (5.7 <= q <= 14.12 W cm(-2)), inlet temperatures (31 <= T-in <= 32.9 degrees C), and a reduced pressure (P-R) of 1.04. To limit the heating to a single wall of the flow channel, a novel test section was designed and built using Inconel-718, Torlon 4203, and stainless steel. Infrared thermography was used to obtain local heat transfer data. Existing supercritical heat transfer correlations, developed for uniform wall heating conditions, did not accurately predict the heat transfer for single wall heating boundary conditions. (C) 2021 Elsevier Ltd. All rights reserved.
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