A way to explain the thermal boundary effects on laminar convection through a square duct

doi:10.1007/s11708-010-0020-2

Front Energ Power Eng Chin

2010, Vol. 4

Issue (4) : 496-506 https://doi.org/10.1007/s11708-010-0020-2

RESEARCH ARTICLE

A way to explain the thermal boundary effects on laminar convection through a square duct

Liangbi WANG(

), Xiaoping GAI, Kun HUANG, Yongheng ZHANG, Xiang YANG, Xiang WU

Department of Mechanical Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

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Abstract

A way using the reformulation of the energy conservation equation in terms of heat flux to explain the thermal boundary effects on laminar convective heat transfer through a square duct is presented. For a laminar convection through a square duct, it explains that on the wall surface, the velocity is zero, but convection occurs for uniform wall heat flux (UWHF) boundary in the developing region due to the velocity gradient term; for uniform wall temperature (UWT) boundary, only diffusion process occurs on the wall surface because both velocity and velocity gradient do not contribute to convection; for UWHF, the largest term of the gradient of velocity components (the main flow velocity) on the wall surface takes a role in the convection of the heat flux normal to the wall surface, and this role exists in the fully developed region. Therefore, a stronger convection process occurs for UWHF than for UWT on the wall surface. The thermal boundary effects on the laminar convection inside the flow are also detailed.

Keywords convective transport heat transfer mass transfer laminar flow thermal boundary effects

Corresponding Author(s): WANG Liangbi,Email:lbwang@mail.lzjtu.cn

Issue Date: 05 December 2010

Cite this article:

Liangbi WANG,Xiaoping GAI,Kun HUANG, et al. A way to explain the thermal boundary effects on laminar convection through a square duct[J]. Front Energ Power Eng Chin, 2010, 4(4): 496-506.

URL:

https://academic.hep.com.cn/fie/EN/10.1007/s11708-010-0020-2
https://academic.hep.com.cn/fie/EN/Y2010/V4/I4/496

1	Shah R K, London A L. Laminar flow forced convection in ducts. In: Hartnett J P, Irvine T F. eds. Advances in Heat Transfer , New York: Academic Press, 1978, 78-384
2	Kays W M, Crawford M E, Weigand B. Convection Heat and Mass Transfer. 4th ed. New York: Mc Graw Hill, 2005
3	Schlichting H. Boundary Layer Theory. 6th ed. New York: McGraw-Hill, 1968
4	Wang L B, Li X X, Lin Z M, Yang X, Wang X H. Additional description of laminar heat convection in tube with uniform wall temperature. Journal of Thermalphysics and Heat Transfer , 2009, 23: 200-205 doi: 10.2514/1.37067
5	Li Z Y, Tao W Q. A new stability-guaranteed second-order difference scheme. Numerical Heat Transfer, Part B , 2002, 42: 349-365 doi: 10.1080/10407790190053987
6	Patankar S V. Numerical Heat Transfer and Fluid Flow. Washington: Hemisphere, 1981

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