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International Heat Transfer Conference 13

ISSN: 2377-424X (online)
ISSN: 2377-4371 (flashdrive)

NUMERICAL SIMULATIONS OF HEAT TRANSFER IN SUPERCRITICAL CARBON DIOXIDE

Z. Lei
Drexel University, Philadelphia, PA, USA

Y. Lin
Drexel University, Philadelphia, PA, USA

Bakhtier Farouk
Department of Mechanical Engineering and Mechanics, Drexel University, Philadelphia, Pennsylvania 19104, USA

Elaine S. Oran
Laboratory for Computational Physics and Fluid Dynamics, Naval Research Laboratory, Washington DC, 20375, USA

DOI: 10.1615/IHTC13.p2.20
10 pages

Abstract

Heat transfer in supercritical fluids is a challenging problem. In addition to conduction and convection, thermomechanical conversion of acoustic energy to heat is significant in fluids near their critical point. Supercritical fluids also exhibit a number of specific interesting properties such as large density, high compressibility, non-zero bulk viscosity, low viscosity and low thermal diffusivity - which make them quite different from gases and liquids. In this paper, thermally generated wave induced convection in a supercritical carbon dioxide filled square enclosure is investigated. The right, top and bottom walls of the enclosure are thermally insulated and the left wall is heated (either rapidly or gradually). Rapid heating causes stronger acoustic waves within the enclosure that enhance mixing and homogenization. The role of the thermally induced acoustic waves in enhancing mixing, and heat transfer in supercritical fluids is examined. The time-dependent flow and temperature fields within the enclosure are obtained by solving a fully compressible form of the Navier-Stokes equations. A highly accurate numerical scheme (flux-corrected transport) is used to discretize the convective terms while the central difference scheme is used to discretize the viscous and the conduction terms. The equations of state describing the p-ρ-T relations and speed of sound in supercritical carbon dioxide are obtained from the NIST Standard Reference Database 12.

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Measurement of fluid temperature with an arrangement of three thermocouples