Fluid flow and heat transfer mechanisms in the spray deposition of tubular preforms

Abstract

A combined experimental and numerical investigation into the fluid flow and heat transfer processes that take place in the spray deposition of tubular preforms is presented. The work is concerned principally with impingement mechanisms at jet diameter to target distances that are large in comparison with previous reported studies. The experimental investigation required the design of a novel heat transfer meter that was capable of resolving the heat transfer coefficient within 2.5 per cent. The experiments gave a new correlation for stagnation heat transfer, similar in form to correlations that have been published for small jet diameter to target distance values. The experiments also showed the presence of skewing of the heat transfer coefficient in the deposition zone due to its tapered nature. A finite volume based model of the deposition chamber was developed and run to compare with the experimental data. This model was found to yield trends similar to those measured experimentally, thus confirming its qualitative capability. However the absolute values of heat transfer coefficient that were computed were significantly lower than measured values. This points to the requirement to consider alternative computing schemes and to investigate the methods of representing the heat transfer mechanisms at the physical boundaries, particularly at the preform surface.

Citation

Sperring, T.P., Gethin, D.T. and Medwell, J.O. (2000), "Fluid flow and heat transfer mechanisms in the spray deposition of tubular preforms", International Journal of Numerical Methods for Heat & Fluid Flow, Vol. 10 No. 3, pp. 268-285. https://doi.org/10.1108/09615530010318008