文献类型：期刊文献

中文题名：固定床内错流传热——Ⅱ．床层对壁给热系数的经验关联式

英文题名：Heat Transfer in the Fixed Bed Embedded with a Cylinder in Cross Flow--Ⅱ. Overall Wall Heat Transfer Coefficient Correlations

作者：刘玉兰[1];吴勇强[1];朱中南[1];朱子彬[1]

机构：[1]华东理工大学化工学院

年份：2005

卷号：5

期号：1

起止页码：6

中文期刊名：过程工程学报

外文期刊名：The Chinese Journal of Process Engineering

收录：CSTPCD;;Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：中国石化集团公司科技开发中心资助项目(编号:499043)

语种：中文

中文关键词：固定床;错流传热;床层对壁的平均给热系数

外文关键词：fixed bed; cross-flow heat transfer; overall wall heat transfer coefficient

摘要：采用3种导热性能不同的固体颗粒为填充物,以空气为介质,在床层被加热的情况下,研究了固定床中内置圆管的错流传热. 采用最小二乘法对实验数据进行拟合,得到以床层对壁的平均给热系数、气体的导热系数和床层中被加热圆管的管径计算的Nusselt准数经验关联式: Nuf=31(λb0/λs)1.4(Db/Dp)0.2Rep0.33Pr0.62, Rep=10～180, Db/Dp=28～116,λb0/λs=0.5～0.2. Reynolds数以固体颗粒的等外表面积当量直径进行计算. 结果表明,在错流传热过程中,表征气体流动特性的参数Rep仍是错流传热的重要影响因素,Nusselt准数除与床层的结构参数Db和颗粒的当量直径Dp有关外,还与颗粒的导热系数λs和床层的导热系数λbo密切相关.
The cross-flow heat transfer was discussed on a cylinder tube embedded in the fixed bed. The bed was packed with different kinds of particles which have dissimilar thermal conductivity. The medium of heat transfer was air, and the tube was heated. Under the conditions of Rep=10~180, Db/Dp=28~116, lbo/ls=0.5~0.2, the following correlation was obtained by means of the least square method:Nuf=31(lbo/ls)1.4(Db/Dp)0.2Rep0.33Pr0.62. Here the Reynolds number is based on the particle surface-equivalent diameter, Nusselt number is calculated by the overall wall heat transfer coefficient, the gas thermal conductivity and the diameter of heated tube embedded in the fixed bed. It is found that for cross-flow heat transfer, Reynolds number is still an important factor affecting heat transfer. Nusselt number has relations with bed characteristic parameter Db, particle equivalent diameter in outer surface Dp and thermal conductivity of packed bed.