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TRANSIENT CONJUGATED UPWARD AND DOWNWARD MIXED CONVECTION IN A PARTIALLY HEATED THICK PIPE

卷 3, 册 1, 2011, pp. 1-14
DOI: 10.1615/ComputThermalScien.v3.i1.10
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摘要

Transient conjugated downward and upward laminar mixed-convection heat transfer in a vertical pipe, partially submitted to a constant heat flux, has been investigated computationally. The governing Navier-Stokes and energy equations were solved by a code developed using the finite volume method and Boussinesq's assumptions. Solutions were obtained for (Pr, Re, Gr) = (5,100, 5 × 105), wall-to-fluid conductivity ratio K = 10, 50, and 100, and pipe thickness-to-diameter ratios Δ = 0.05 and 0.25. From a parametric study, transient distribution of the normalized interfacial heat flux and of the friction coefficient ratio as a function of the axial coordinates as well as transient evolution of the vector velocities were obtained and the effect of K and Δ investigated. It was found that the magnitude and the extent of upstream and downstream heating increase monotonically with an increase of Δ or K. In turn, this heat flux redistribution significantly affects the friction coefficient ratio and velocity field in the downstream and upstream adiabatic sections for the downward and upward mixed-convection cases.

对本文的引用
  1. Yang G., Wu J.Y., Conjugate mixed convection in the entrance region of a symmetrically heated vertical channel with thick walls, International Journal of Thermal Sciences, 98, 2015. Crossref

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