Numerical simulation of flow and heat transfer of n-decane in sub-millimeter spiral tube at supercritical pressure  

作　　者：Jiahao Xing Huaizhi Han Ruitian Yu Wen Luo 

机构地区：[1]School of Chemical Engineering,Sichuan University,Chengdu 610065,China [2]Engineering Research Center of Combustion and Cooling for Aerospace Power,Ministry of Education,Sichuan University,Chengdu 610065,China

出　　处：《Chinese Journal of Chemical Engineering》2023年第8期173-185,共13页中国化学工程学报（英文版）

基　　金：support by the Scientific Research Start-up Funds for introducing Talent in the Sichuan University (20822041C4014);National Science and Technology Major Project of China (2017-I-0004-0004)。

摘　　要：The flow and heat transfer characteristics of n-decane in the sub-millimeter spiral tube(SMST) at supercritical pressure(p = 3 MPa) are studied by the RNG k-ε numerical model in this paper. The effects of various Reynolds numbers(Re) and structural parameters pitch(s) and spiral diameter(D) are analyzed.Results indicate that the average Nusselt numberNu and friction factorNu increase with an increase in Re, and decrease with an increase in D/d(tube diameter). In terms of the structural parameter s/d, it is found that as s/d increases, the Nu first increase, and then decrease. and the critical structural parameter is s/d = 4. Compared with the straight tube, the SMST can improve Nu by 34.8% at best, while it can improve Nu by 102.1% at most. In addition, a comprehensive heat transfer coefficient is applied to analyze the thermodynamic properties of SMST. With the optimal structural parameters of D/d = 6 and s/d = 4, the comprehensive heat transfer factor of supercritical pressure hydrocarbon fuel in the SMST can reach 1.074. At last, correlations of the average Nusselt number and friction factor are developed to predict the flow and heat transfer of n-decane at supercritical pressure.

关 键 词：Sub-millimeter spiral tube Supercritical pressure Numerical simulation Heat transfer performance 

分 类 号：V231[航空宇航科学与技术—航空宇航推进理论与工程]