文献类型：期刊文献

中文题名：外伴管伴热系统传热特性及优化的数值研究

英文题名：NUMERICAL ANALYSIS OF HEAT TRANSFER CHARACTERISTICS AND OPTIMIZATION OF EXTERNAL TUBE HEAT TRACING SYSTEM

作者：戚学贵[1];谭晓勇[1];徐宏[1]

机构：[1]华东理工大学机械与动力工程学院化机所,上海市200237

年份：2006

卷号：36

期号：3

起止页码：43

中文期刊名：炼油技术与工程

外文期刊名：Petroleum Refinery Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；

语种：中文

中文关键词：蒸汽伴热;管道;传热特性;动态;数值计算;优化;自然对流

外文关键词：steam tracing, pipe, heat transfer characteristics, dynamics, numerical calculation, optirnization, natural convection

摘要：利用FLUENT软件,对外伴管伴热体系传热特性及其优化进行了数值分析与讨论。分析表明系统中存在传导、对流及辐射传热,其中封闭空气夹层又存在层流自然对流。计入空气对流的模拟表明,工艺管受热不均匀,而伴管布置在其正下方、保持空气层不被保温层挤占可提高伴热效果。伴热平衡时,伴热介质温度、热损失随物料温度近似线性增加。空气层均温假设导致工程设计不合理,而降低工艺管与伴管之间的热阻是提高伴热能力的关键。
The heat transfer characteristics and optimization of external tube heat tracing system are numerically analyzed with the help of software FLUENT. The analysis demonstrates that the conduction, convection and radiation heat transfers occur in the system while the laminar flow and natural flow exist in the closed space. The simulation with consideration of air convection shows that there is an uneven heat reflux of the process pipe. The installation of heat tracing tubes directly under the pipe and keeping an air space will improve heat tracing efficiency. In equilibrium, the temperature of heat tracing media and heat loss rise linearly with flow media temperature. The improper assumption of mean temperature of closed air space will result in improper design. The reduction of heat resistance between process pipe and heat tracing tube is critical for improving heat tracing efficiency.