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Second Thermal and Fluids Engineering  Conference

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

PARTICLE SIZE AND SPEED EFFECTS ON THE SWEEPING CONVECTION IN STRAIGHT, ISOFLUX CHANNELS

Amir Kiaee
Southern Methodist University, Department of Mechanical Engineering, POBox 750337, Dallas, TX 75275-0337, USA

Jose Lage
Southern Methodist University

Abstract

The transient start-up flow of a liquid (water) and a solid spherical particle through a straight heated channel is considered here using numerical simulations. The convection process begins with the quiescent fluid and particle in the channel at a set uniform temperature, and the surfaces of the channel set to an isoflux heating condition. The fluid velocity and temperature at the inlet of the channel are kept constant throughout the simulations, being respectively, fully developed and uniform. The study aims at determining the effects of the particle on the sweeping of the boundary layers that forms along the channel surfaces. The particle is considered adiabatic, allowing for the isolation of the sweeping effect from the particle heat capacity effect on the convection process. Preliminary results reported here compare the convection effects of a single particle flowing with the fluid to the results obtained for the clear (of particles) fluid flow case. The results reveal the particle effect on the convection process to be localized and yet very significant, with the surface-averaged Nu number increasing by up to 12%, and with negligible pressure drop effect across the channel. This somewhat unexpected result supports the expectation of sweeping convection being a very effective new convection mechanism with tremendous practical potential.

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