Annals of the Assembly for International Heat Transfer Conference 13

ISBN 1-56700-225-0 / CD 1-56700-226-9

Year 2006

M. Xue
University of Toronto, Toronto, Canada

Javad Mostaghimi
Centre for Advanced Coating Technologies, University of Toronto, 5 King's College Road, Toronto, Ontario M5S-3G8, Canada

Sanjeev Chandra
Department of Mechanical and Industrial Engineering, University of Toronto, Toronto, Ontario, Canada

A three-dimensional, time-dependent numerical model of free-surface flows and heat transfer including phase change has been developed to simulate the coating formed by hundreds of thermally sprayed alumina droplets landing on a solid stainless steel surface. Fluid flow in the droplets was modelled using a finite difference solution of the Navier-stokes equations in 3D Cartesian coordinates assuming laminar, incompressible flow. Heat transfer was simulated by solving the energy equation, assuming densities of liquid and solid to be constant and equal to each other. The free surface of the droplet was assumed to be adiabatic. Values of contact resistance between the droplet and the substrate were supplied as a constant input to the model. We conducted two simulations, one with assigned droplet deposition positions and impact parameters, and the other with randomly generated droplet properties. The process parameters of both two schemes, such as the droplet velocity, diameter and temperature, are based on the experimental measurements of thermally sprayed alumina particles. The model generated simulated coatings, from which properties such as thickness, porosity and roughness can be measured.

MTH-16 pages DOI: 10.1615/IHTC13.p9.160 Download article

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