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Second Thermal and Fluids Engineering  Conference

ISSN: 2379-1748
ISBN: 978-1-56700-430-4

A COMPUTATIONAL STUDY OF NATURAL CONVECTION HEAT TRANSFER BETWEEN TWO HORIZONTAL PARALLEL PLATES IN A THERMOFORMING PROCESS

Gustavo Urquiza-Beltrán
Centro de Investigación en Ingenieria y Ciencias Aplicadas (CIICAp), Autonomous University of Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, México

Jaime B. Alanis-Martinez
Centro de Investigación en Ingenieria y Ciencias Aplicadas (CIICAp), Autonomous University of Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, México

Laura L. Castro-Gómez
Centro de Investigación en Ingenieria y Ciencias Aplicadas (CIICAp), Autonomous University of Morelos (UAEM), Av. Universidad 1001, Col. Chamilpa, C.P. 62209, Cuernavaca, Morelos, México

Abstract

The purpose of this study is to analyze the natural convection heat transfer between horizontal parallel plates in a thermoforming process. Natural convection in a narrow cavity space formed by two horizontal plates is very different from that of an almost infinite space. For an efficient application of natural convection to cooling processes, it is necessary to fully understand the mechanisms of heat dissipation inside parallel-plate channels. Basic knowledge on the flows and heat transfer of natural convection in such configurations is needed for the thermal design of free convection oven. In the present work, numerical simulations were conducted with an input condition for a heat transfer computer code with laminar flow in a rectangular cavity with free atmospheric wall where the initial temperature of ceramic parts and atmospheric air were 373.15 K and 300 K, respectively. The Rayleigh numbers is fixed at Ra = 4 × 104 without considering solar radiation. The air inside the cavity was assumed radiatively non-participant.

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