Numerical Investigation of Thermal Performance of Minichannels with Transversely Patterned Non-slip/Slip Surfaces (Superhydrophobic Surfaces) in Turbulent Regime
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Date
2021-12-10
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Abstract
This study focuses on investigating the thermal performance of superhydrophobic surfaces in turbulent channel flow. The superhydrophobic surface consisted of slip and non-slip bands arranged transverse to the flow direction. A numerical investigation using CFD software Star-CCM+ was implemented on a minichannel for a Reynolds number of 5600. The turbulence model with coupled solver was used for simulating the flow. Several numerical cases were simulated to understand the effect of non-slip to slip ratio and width of non-slip bands on pressure drop and thermal performance of circular minichannels. Two non-slip to slip ratios and three different non-slip band widths were used in the simulation process. Parameters representative of the flow and heat transfer behavior such as boundary layer thickness, friction factor, slip length, shape factor, Nusselt number and performance evaluation criterion (PEC) were calculated to better understand the effects of non-slip to slip ratio and width of non-slip bands on thermal performance. The study concluded by investigating the impact of Reynolds number on thermal performance. In summary, the decrease in non-slip to slip ratio and increase in non-slip width led to reduction in pressure drop and enhancement of heat transfer. Furthermore, the configuration with non-slip to slip ratio of 1/3 and nonslip width of xxx was found to be the optimal design, achieving a 40% reduction in pressure drop and a PEC value of 3.39.
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Superhydrophobic surface, turbulent flow, heat transfer enhancement, minichannels,