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Heat Transfer Research
Импакт фактор: 1.199 5-летний Импакт фактор: 1.155 SJR: 0.267 SNIP: 0.503 CiteScore™: 1.4

ISSN Печать: 1064-2285
ISSN Онлайн: 2162-6561

Выпуски:
Том 51, 2020 Том 50, 2019 Том 49, 2018 Том 48, 2017 Том 47, 2016 Том 46, 2015 Том 45, 2014 Том 44, 2013 Том 43, 2012 Том 42, 2011 Том 41, 2010 Том 40, 2009 Том 39, 2008 Том 38, 2007 Том 37, 2006 Том 36, 2005 Том 35, 2004 Том 34, 2003 Том 33, 2002 Том 32, 2001 Том 31, 2000 Том 30, 1999 Том 29, 1998 Том 28, 1997

Heat Transfer Research

DOI: 10.1615/HeatTransRes.2012002036
pages 259-284

INVESTIGATING THE NATURAL CONVECTION HEAT TRANSFER FROM TWO ELLIPTIC CYLINDERS IN A CLOSED CAVITY AT DIFFERENT CYLINDER SPACINGS

Seyyed Mohammad Ali Noori Rahim Abadi
University of Pretoria
Arian Jafari
School of Mechanical Engineering, College of Engineering, University of Tehran, Tehran, Iran

Краткое описание

A numerical investigation is presented to survey the laminar natural convection heat transfer around two elliptic cylinders with different vertical spacings relative to each other in a closed cavity. The numerical model used in this paper is based on a 2D Navier-Stokes incompressible flow momentum and energy equations solver on an unstructured grid. Discretization of the governing equations that include the continuity, momentum, and energy equations is achieved through a finite element scheme based on the Characteristic Based Split (CBS) algorithm. The working fluid is assigned a Prandtl number of 0.71 (air) and assumed to be incompressible with constant physical properties. The radiation, viscous dissipation, and pressure work are also assumed to be negligible throughout this investigation. Fluid flow and heat transfer characteristics are examined in the range of the Rayleigh number, cylinders spacing, and cylinders' orientation such that: 103 ≤ Ra ≤ 106, 1 ≤ s/a ≤ 4, and b/a = 0.67, 1.5. It is also assumed that cylinders' location can be changed vertically along the square cavity centerline. The local and average Nusselt numbers streamlines, and isotherms are presented for various relevant dimensionless groups. The obtained results reveal that the Rayleigh number and cylinders' position would change magnitude and patterns of streamlines and isotherms.


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