摘要
为研究超临界二氧化碳(S-CO_(2))在水平管道中加热流动时产生的浮升力效应对其流动传热特性的影响,进行了相同工况下光管与内插螺旋丝管的流动传热实验。研究了壁面热流密度与质量流速对浮升力效应的影响,并且讨论了管道中插入螺旋丝后对壁面温度分布、传热模式等的影响。结果表明:由于浮升力的作用,S-CO_(2)在水平加热流动中,会沿重力方向产生温度分层,导致顶部、底部的壁面温度产生较大的温度差值,最大壁面温度差值达到48 K;管内插入螺旋丝后有效抑制了浮升力导致的温度分层现象,底部传热系数提高了60%以上,顶部传热系数提高了140%以上。根据实验结果对4种传热关联式进行验证,发现Bishop公式的综合表现最好。
For the supercritical carbon dioxide(S-CO_(2))with heated flow in a horizontal tube,to research the influence of the buoyancy effect on flow and heat transfer characteristics,experiments were conducted on flowing and heating in optical and inner coiled wire tubes under the same condition.Investigations were carried out for the influence of the wall heat flux density and mass velocity on the buoyancy effect,while discussions were given for the influence of the inserted coiled wires on the wall temperature distribution,heat transfer mode,etc.Results show that the temperature stratification caused by the buoyancy effect occurs along the gravity direction during SO_(2)horizontal flowing with heating,which leads to the severe wall temperature divergence at the top and bottom,with a maximum wall temperature difference of up to 48 K.The inserted coiled wires in tube can effectively inhibit the temperature stratification caused by the buoyancy effect,while the heat transfer coefficients at the bottom and top are increased by more than 60%and more than 140%,respectively.Based on the validation of experimental results with four heat transfer correlations,it is found that Bishop correlation has the best comprehensive performance.
作者
高明
张帮辉
崔文斌
杨其国
任燕
GAO Ming;ZHANG Banghui;CUI Wenbin;YANG Qiguo;REN Yan(School of Energy and Power Engineering,University of Shanghai for Science and Technology,Shanghai 200093,China)
出处
《动力工程学报》
CAS
CSCD
北大核心
2024年第11期1663-1671,共9页
Journal of Chinese Society of Power Engineering
基金
国家自然科学基金资助项目(51976127)
上海市科技计划资助项目(20060502000)。
关键词
超临界二氧化碳
水平流动
传热
浮升力
supercritical carbon dioxide
horizontal flow
heat transfer
buoyancy
作者简介
高明(1982-),男,黑龙江海林人,教授,工学博士,研究方向为强化传热传质。电话(Tel.):021-55272106,E-mail:gaoming@usst.edu.cn。
