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首页> 外文期刊>Journal of thermal analysis and calorimetry >Flow confinement effect and heat transfer around square cylinder with downstream control cylinders
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Flow confinement effect and heat transfer around square cylinder with downstream control cylinders

机译：Flow confinement effect and heat transfer around square cylinder with downstream control cylinders

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A two-dimensional numerical investigation on flow past a heated square cylinder at different confinements has been carried out in the presence of two control cylinders placed on the rear side of the cylinder near the wake to control the shedding phenomena. The confined flow has been simulated with a blockage ratio from 4 to 8 (i.e., ratio of the computational domain height to the diameter of the square). The effects of Reynolds number (Re) range 100 <= Re <= 150 on various flow and heat transfer characteristics are studied and analyzed in the form of streamline plots, variations of pressure and viscous drag coefficients, Strouhal number (St), total pressure drop and Local and average Nusselt number. Different varieties of flow pattern were observed under laminar conditions with different combinations of Re, Blockage ratio (BR), size of the control cylinder and placement of the control cylinder. The St for geometry with control cylinder of size d-30% decreases by 6.5% when shifted from L = 0.6 to L = 1.6 for least BR 4 and maximum Reynolds number 150. The pressure difference decreases by 10.2% for further control cylinder position from 0.6 to 1.6, size from 20 to 30% at BR 4 and Re 100. The control cylinder closer to the bluff body maintains the pressure difference in increasing BR. The convective heat transfer is higher for L = 1.6 for lower BR. An increase of 8.6% observed for Re 150 at d-30%. The increase in BR reduces the effect of the positioning of the control cylinder and its size becomes the decisive factor.

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