Heat transfer characteristics of supercritical CO2 cooled in horizontal helically coiled tube

doi:10.11949/j.issn.0438-1157.20161357

Abstract

Abstract:

The convection heat transfer characteristics of supercritical CO₂ cooled in horizontal helically coiled tube is studied experimentally and numerically.The effects of mass flux, heat flux and pressure on heat transfer for helically coiled tube are analyzed.The comparisons of the heat transfer coefficients are made between the straight tube and the helically coiled tube.And, the heating and cooling conditions for the helically coiled tube are compared.Results show that the heat transfer coefficient is lager in helically coiled tube than straight tube under the same condition.With the decrease of the mass flux and the increase of pressure, the heat transfer enhancement of the helically coiled tube is improved compared to the straight tube.For a given heat flux, the heat transfer coefficients are larger at cooling conditions than that at heating conditions in helically coiled tube.Furthermore, the heat transfer coefficients at heating conditions experience drastically oscillation due to the buoyancy force.

Key words: supercritical CO₂, numerical study, experimental study, horizontal helically coiled tube, heat transfer

摘要：

采用数值模拟和实验结合的方法研究超临界CO₂在水平冷却螺旋管内的换热特性。研究了质量流量、热通量及压力对传热系数的影响，并比较了直管和螺旋管在加热和冷却条件下的换热特性。结果表明，与直管相比，螺旋管对换热的强化作用随着质量流量的减小和压力的增加而增加。在相同热通量条件下，螺旋管的冷却换热的传热系数比加热的传热系数高，且由于浮升力的影响，加热条件下传热系数存在较大的振荡。

关键词: 超临界CO₂, 数值模拟, 实验研究, 水平螺旋管, 换热

CLC Number:

TK124

LIU Xinxin, YE Jian, XU Xiaoxiao, LIU Chao, WANG Kaizheng, LI Hongrui, BAI Wanjin. Heat transfer characteristics of supercritical CO₂ cooled in horizontal helically coiled tube[J]. CIESC Journal, 2016, 67(S2): 120-127.

刘新新, 叶建, 徐肖肖, 刘朝, 王开正, 李洪瑞, 白万金. 超临界CO₂在水平螺旋管内的冷却换热特性[J]. 化工学报, 2016, 67(S2): 120-127.

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Heat transfer characteristics of supercritical CO₂ cooled in horizontal helically coiled tube

超临界CO₂在水平螺旋管内的冷却换热特性

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