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Study on the Heat Transfer Characteristics of Supercritical CO2in Helical Tube Gas Cooler(PDF)

南京师范大学学报(工程技术版)[ISSN:1006-6977/CN:61-1281/TN]

Issue:
2020年02期
Page:
1-6
Research Field:
动力工程及工程热物理
Publishing date:

Info

Title:
Study on the Heat Transfer Characteristics of Supercritical CO2in Helical Tube Gas Cooler
Author(s):
Guan WanyanChen WeiweiLu Shihua
School of Energy and Mechanical Engineering,Nanjing Normal University,Nanjing 210023,China
Keywords:
supercritical CO2helical tubegas coolerheat transfer characteristics
PACS:
TK124; TK11+4
DOI:
10.3969/j.issn.1672-1292.2020.02.0001
Abstract:
With compact structure and high heat exchange efficiency,helical tube is widely used in CO2 gas cooler. The thermophysical properties of supercritical CO2 change dramatically which makes the heat transfer characteristics of supercritical CO2 in helical tubes more complicated. Through the numerical simulation of different conditions of cooling heat flux and mass flux,it is found that the distribution of heat transfer coefficient of supercritical CO2 in the helical tube is approximately parabolic along the flow direction. The peak value of heat transfer coefficient(PV-HTC)increases with the increase of cooling heat flux,while where the PV-HTC appeared,the flow swirl angle shows the opposite tendency. The PV-HTC increases with the increase of mass flux,and where PV-HTC appeared,the flow swirl angle shows the same tendency. Since the ratio of heat flux to mass flux determines the distribution of heat transfer coefficient along the flow direction,a correlation suitable for supercritical CO2 heat transfer calculation in uniformly cooled helical tube is proposed,which can provide a reference for optimization and design of helical tube gas cooler.

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Last Update: 2020-05-15