Heat transfer enhancement by the suppression of the stratified stagnant core in a rectangular differentially heated cavity

被引：3

作者：

Huerta, P. ^{[1
]}

Gers, R. ^{[2
]}

Skurtys, O. ^{[1
]}

Moreau, F. ^{[3
]}

Saury, D. ^{[3
]}

机构：

[1] Univ Tecn Federico Santa Maria, Dept Mech Engn, Ave Vicuna Mackenna 3939, Santiago, Chile

[2] Univ Tecn Federico Santa Maria, Dept Mech Engn, Ave Espana 1680, Valparaiso, Chile

[3] Univ Poitiers, Inst Pprime UPR CNRS 3346, Dept FTC, CNRS,ENSMA, Teleport 2, 1 Ave Clement Ader, BP40109, Futurosc, F-86961 Poitiers, France

来源：

INTERNATIONAL JOURNAL OF THERMAL SCIENCES | 2023年 / 186卷

关键词：

Differentially-heated cavity; Natural convection; Heat transfer modification; DIRECT NUMERICAL SIMULATIONS; NATURAL-CONVECTION; HORIZONTAL ENCLOSURE; FLOW; TRANSITION;

D O I：

10.1016/j.ijthermalsci.2022.108137

中图分类号：

O414.1 [热力学];

学科分类号：

摘要：

This work investigates numerically a natural convection flow in a rectangular differentially heated cavity. The aspect ratio of the cavity (height over width) is 4, the working fluid is air and the Rayleigh number based on the height of the cavity is 9 x 107. A large rectangular obstacle is placed in the center of the cavity. The influence of the size of that obstacle and the effect of a new geometry (obtained by extrusion of two rectangular forms from the obstacle) on the flow dynamics and heat transfers are investigated. The global and local heat transfers modifications, compared to the case without obstacle, are highlighted for several configurations. In such a flow regime, an optimal geometry and a solid-to-fluid conductivity ratio are determined. This geometry leads, for an adiabatic obstacle, to a global heat transfer increase of 4.39% with a local heat transfer increase up to 80%.

引用

页数：11

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