Abstract
Mixed convection over horizontal heated plate was simulated with four numerical models based on Reynolds stress, large eddy simulation (LES) and eddy viscosity approximations. Temperature distributions over plate and in adjacent volume of fluid were the main criteria of results assessment. Three-dimensional computational domain was considered with symmetry boundary conditions. Simulation was performed with Code_Saturne software package in unsteady formulation. Three orthogonal meshes were evaluated to validate initial guess about optimal cell size. u2-f and Smagorinsky LES models appeared to yield the most adequate results. However, temperature distribution in high-buoyancy region, located in the middle of heated plate, was reproduced much more accurate with classical LES and elliptic blending Reynolds stress models. Obtained results are suitable for industrial applications (e.g. cooling jackets) and might be a base ground for further research.
Highlights
Efficient heat exchange is usually associated with highly forced convection, while natural convection is negligible
U2-f and large eddy simulation (LES) models reproduced slight oscillations of hot crests, which were distributed over heated plate in mostly stationary manner
Hot crests modeled with Elliptic blending RSM (EBRSM) were moving with approximately constant speed of 0.01 m/s from the center of the plate towards side walls of the duct
Summary
Efficient heat exchange is usually associated with highly forced convection, while natural convection is negligible. Maintenance of forced convection might be too expensive and complex, especially with liquid heat carriers. Many industrial heat exchangers (e.g. cooling jackets) tend to operate in mixed convection mode, when pressure and buoyant forces contribute to convection at approximately the same rate. Prediction of flow patterns and temperature distribution is crucial for effective implementation of mixed convection in heat exchange equipment. Understanding of flow affected by mixed convection can minimize thermal stresses and eliminate stagnation zones. Nikitin M.N. Simulation of mixed convection over horizontal plate. ISP RAS, vol 29, issue 6, 2017, pp. ISP RAS, vol 29, issue 6, 2017, pp. 245-252
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