Investigation of evaluation criterion of axial wall heat conduction under two thermal boundary conditions
发布时间：2025-04-30
点击次数：
- 发布时间：
- 2025-04-30
- 论文名称：
- Investigation of evaluation criterion of axial wall heat conduction under two thermal boundary conditions
- 发表刊物：
- Applied Energy
- 摘要：
- The influence of axial wall heat conduction has been investigated in circular tube laminar flow and heat transfer under two classical thermal boundary conditions. Moreover, the effect of heat losses through the tube end is also considered beside of the adiabatic boundary conditions of the tube end. Three-dimensional numerical simulations are conducted with wall materials, wall thicknesses and tube lengths. A wide range of Peclet number is considered from 7 to 14000. Three parameters including the modified axial conduction number, the so-called axial conduction number and the temperature gradient number are comprehensively studied. Meanwhile, under the thermal boundary condition of uniform outside heat flux, the criterion for judging whether the axial wall heat conduction can be negligible is also discussed and modified. Under the constant outside wall temperature boundary condition, the temperature gradient number is presented to assess the relevance of the axial wall heat conduction. The approximate range of effect of axial wall heat conduction on the local Nusselt number for fully developed flow is obtained to provide a reference for judging whether the axial heat conduction can be negligible.
- 合写作者：
- Mei. Lin, Qiu Wang Wang, Zhi Xiong Guo
- 卷号：
- 162
- 页面范围：
- 1662-1669
- 是否译文：
- 否
- 发表时间：
- 2016-06-05