Abstract
The objective of this work is to evaluate the convective heat transfer and flow characteristics around three heated spheres in a tandem arrangement. Numerical simulation and Experimental verification were performed using stationary copper spheres located inside a cylindrical channel with constant channel-to-sphere diameter ratio. Numerical simulation is done for three-dimensional steady-state flow using ANSYS-FLUENT by solving the Reynolds-Averaged Navier Stokes (RANS) equations. Over the test range of Reynolds numbers (2500-55000), the numerical results of the average surface temperature and heat transfer coefficient obtained are a reasonably good agreement with those obtained by experimental measurements. The distributions of the heat transfer coefficient, temperature profiles, velocity field and pressure coefficient around the sphere’s surface are calculated and analyzed.
Highlights
The heat transfer and flow structure passing around multiple heated bluff bodies are widely investigated problems due to their importance in several engineering such as high temperature gas-cooled nuclear reactor - HTGR [1], bio-film reactor [2] and solar receivers [3], etc. applications such as nuclear power plants, food and chemical processing, and so on
Numerical simulation is done for three-dimensional steady-state flow using ANSYS-FLUENT by solving the ReynoldsAveraged Navier Stokes (RANS) equations
Over the test range of Reynolds numbers (250055000), the numerical results of the average surface temperature and heat transfer coefficient obtained are a reasonably good agreement with those obtained by experimental measurements
Summary
The heat transfer and flow structure passing around multiple heated bluff bodies are widely investigated problems due to their importance in several engineering such as high temperature gas-cooled nuclear reactor - HTGR [1], bio-film reactor [2] and solar receivers [3], etc. applications such as nuclear power plants, food and chemical processing, and so on. Numerical and experimental investigations have been conducted to analyze and understand the wake flow structure around a single-sphere and various arrangements of two spheres [4,5,6,7]. For example in space between the spheres all local values of relevant variables, such as velocity field, pressure drop, temperature profiles, and so on, is determined by solving the Navies Stokes equations. Such parameters considered to be important details to predict and understanding of the phenomena that occur in such packed spheres.
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