Effect of Mandrel Rotation on the Accuracy of Computed Temperature Profile during Near Net Shape Forming by Plasma Spraying

Near net shape processing by plasma spray forming (PSF) is a rapid prototyping technique that involves deposition of ceramic coating on the mandrel and its removal as a free-standing structure. This process requires a precise control of the temperature attained by the mandrel during spraying. This article describes the improvement in the accuracy of the temperature prediction of the mandrel by considering the effect of solid rotation inside fluid during conjugate heat transfer. The computation model was modified by incorporating no-slip interface boundary condition instead of tangential slip condition. The transient temperature profiles of the mandrel computed with tangential slip and noslip interface conditions were validated by experimentally measured temperature profiles. The accuracy of the computed temperature results increased to 95% for no-slip condition as compared to 79% for the tangential slip condition. * Corresponding Author: Arvind Agarwal, Ph: 305-348-1701, Fax: 305-348-1932 Email: [email protected]