numerical investigation of convective heat transfer and friction factor of laminar air flow in a perforated trapezoid-shaped plate-fin channel in 3 dimensions with geometric analysis (a new achievement)

The aim of this study is to develop a unique perforated trapezoid-shaped plate-fin channel. so, a numerical simulation is performed on the mentioned plates with different geometries. the laminar airflow (10≤re≤1000) passes through the inter-fin passages with perforated fins, whose perforations are distributed equally throughout the duct. the effects of corrugation angle (ϕ), cross-section aspect ratio (α=h/savg), and cross-section inclination angle (ψ) are studied. this study has identified the improved performance of the nusselt number and the fanning friction factor (f) in a variety of reynolds. a quantitative assessment of the improvement is done by measuring the area goodness factor (j/f) compared with a plain flat channel. based on the results, with increasing ϕ from 30˚ to 45˚, the mentioned channel’s performance improves. however, as the angle increases more, performance begins to decrease. the channel’s performance improves with increasing α. also, the performance improves by changing ψ from 90˚ to 76.60˚. based on the results, for a perforated case with ϕ=45˚, α=10, and ψ=90˚ at re=200, versus the non-perforated fin, f decreases ~9%, and j/f increases ~61%. also, for the above-mentioned perforated case, when ψ is changed from 90˚ to 76.60˚, at re=200, f decreases ~1.3%, and j/f increases ~8.2%.