Numerical analysis of natural convective and radiative heat transfer in an arbitrary shaped enclosure

Journal Article · Thu Oct 01 04:00:00 EDT 1998 · Numerical Heat Transfer. Part A, Applications

OSTI ID:669870

Pak, H Y ^[1]; Park, K W ^[2]

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1. Hanyang Univ., Seoul (Korea, Republic of). Dept. of Mechanical Engineering
2. LG Industrial Systems Co., Ltd., Incheon (Korea, Republic of). Building Systems Research Center

Combined natural convection and radiation heat transfer in arbitrarily shaped enclosures has received considerable attention because of its importance in various high-temperature systems such as heat exchangers, nuclear reactors, furnaces and boilers, and solar collectors. Here, the flow and thermal characteristics of the interactions of natural convection and radiation in an enclosure containing circular ducts are analyzed numerically. For calculation of flow fields, the SIMPLE algorithm originally developed in Cartesian coordinates is extended and modified to apply to the curvilinear coordinates system. The radiation part of the problem for an arbitrarily shaped domain is solved by using the finite volume method (FVM). Cartesian velocity components are used as the dependent variables in momentum equations, and a nonstaggered grid system is employed. The flow and thermal fields for an irregular geometry are investigated for the variation of such parameters as scattering albedo, optical thickness, and Planck number. The test problem is compared with both the exact solutions and the discrete ordinates method solution. The results show that the FVM is an effective method to predict radiative heat transfer processes in irregular geometries and that the change of spatial thickness has more effect than that of scattering albedo on flow and thermal fields.

• OSTI ID: 669870
• Journal Information: Numerical Heat Transfer. Part A, Applications, Journal Name: Numerical Heat Transfer. Part A, Applications Journal Issue: 5 Vol. 34; ISSN 1040-7782; ISSN NHAAES
• Country of Publication: United States
• Language: English

Related Subjects

42 ENGINEERING
COMPARATIVE EVALUATIONS
COORDINATES
FLUID FLOW
GEOMETRY
NATURAL CONVECTION
NUMERICAL ANALYSIS
RADIANT HEAT TRANSFER
TEMPERATURE GRADIENTS