Heat transfer characteristics of supercritical n-decane in horizontal circular tubes with circumferentially non-uniform heating

被引：0

作者：

Wang Y. ^{[1
]}

Lu Y. ^{[1
]}

Li S. ^{[2
]}

Dong M. ^{[2
]}

机构：

[1] School of Energy and Power Engineering, Northeast Electric Power University, Jilin

[2] School of Energy and Power Engineering, Dalian University of Technology, Dalian

来源：

Huagong Xuebao/CIESC Journal | 2021年 / 72卷 / 03期

关键词：

Buoyancy; Heat transfer; N-decane; Prediction; Secondary flow; Supercritical fluid;

D O I：

10.11949/0438-1157.20200377

中图分类号：

学科分类号：

摘要：

Aiming at the problem of heat protection for scramjet regenerative cooling, a simulation study on the heat transfer of supercritical pressure n-decane in a horizontal tube with top heating and bottom heating was carried out. The heat transfer characteristics and differences under these two heating conditions have been analyzed. The influence mechanisms of outer-wall heat flux, mass flux, operating pressure and tube thermal conductivity on heat transfer were investigated. The prediction of average heat transfer in the circumferential direction was obtained. The results show that the different inner-wall temperature and heat flux distributions under the two heating conditions have been observed because of the different buoyancy effects. The heat transfer deterioration is gradually weakened with the increase of circumferential angle when the top is heated. The secondary flow is more significant under the bottom heating condition, the heat transfer deterioration always occurs in the circumferential direction. The pseudo-film thermal resistance of high-temperature fluid is the cause of this heat transfer deterioration. Using the high thermal conductivity channel, increasing the operating pressure, and decreasing the heat-to-mass ratio can reduce the differences of inner-wall temperature and heat flux in the circumferential direction. The proposed correlation can reasonably predict the average heat transfer in the circumferential direction, and meet the engineering application of thermal protection design. © 2021, Editorial Board of CIESC Journal. All right reserved.

引用

页码：1342 / 1353

页数：11

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