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Full-Text Articles in Engineering
Dendrite Tip Radii In Directionally Solidified Pb-8.4-Atmospheric-Percent-Au, Surendra N. Tewari
Dendrite Tip Radii In Directionally Solidified Pb-8.4-Atmospheric-Percent-Au, Surendra N. Tewari
Chemical & Biomedical Engineering Faculty Publications
The cell/dendrite tip radii in directionally solidified Pb-8.4at.%Au have been investigated as a function of the growth speed and thermal gradient in the liquid at the tip. Dendrite growth models are not able to predict quantitatively the tip radii and tip compositions separately because of the occurrence of thermosolutal convection during growth. However, the relationship between the destabilizing solutal gradient, the stabilizing thermal gradient and the capillarity at the tip assumed using the ''marginal stability'' criterion is supported by the experimental data.
A Numerical Solution For The Turbulent Flow Of Non-Newtonian Fluids In The Entrance Region Of A Heated Circular Tube, Prapat Wangskarn, Bahman Ghorashi, Rama Subba Reddy Gorla
A Numerical Solution For The Turbulent Flow Of Non-Newtonian Fluids In The Entrance Region Of A Heated Circular Tube, Prapat Wangskarn, Bahman Ghorashi, Rama Subba Reddy Gorla
Chemical & Biomedical Engineering Faculty Publications
Numerical solutions of conservation equations are obtained for turbulent flow of non-Newtonian fluids in a circular tube. The forward marching procedure of Patankar and Spalding^1 was implemented in order to obtain the simultaneous development of the velocity and temperature fields by using the apparent viscosity of fluids. Prandtl's mixing length concept is used to determine the apparent turbulent shearing stress. Furthermore, local and average Nusselt numbers are obtained in the entrance region, as well as in the fully developed region. For the case of the fully developed region, values of the Nusselt numbers …
Asymptotic Boundary-Layer Solutions For Mixed Convection From A Vertical Surface In A Micropolar Fluid, Rama Subba Reddy Gorla, Paul P. Lin, An-Jen J. Yang
Asymptotic Boundary-Layer Solutions For Mixed Convection From A Vertical Surface In A Micropolar Fluid, Rama Subba Reddy Gorla, Paul P. Lin, An-Jen J. Yang
Mechanical Engineering Faculty Publications
Using the theory of micropolar fluids due to Eringen, asymptotic boundary layer solutions are presented to study the combined convection from a vertical semi-infinite plate to a micropolar fluid. Consideration is given to the region close to the leading edge as well as the region far away from the leading edge. Numerical results are obtained for the velocity, angular velocity and temperature distribution. The missing wall values of the velocity, angular velocity and thermal functions are tabulated. Micropolar fluids display drag reduction and reduced surface heat transfer rate when compared to Newtonian fluids.