Numerical investigation of convective heat transfer and Friction factor of laminar airflow in a perforated trapezoid-shaped plate-fin channel in 3 dimensions with geometric analysis (A new achievement)

Document Type : Article


Department of Mechanical Engineering, Faculty of Engineering, Urmia University, Urmia, Iran


The aim of this study is to develop a unique trapezoid-shaped perforated fin design. Due to surface transpiration, the fin surface perforation is associated with the uncommon phenomenon of increased heat transfer along with reduced frictional coefficient, in comparison to its non-perforated surface. in order to show the importance of the subject, a numerical simulation has been performed on trapezoidal perforated plates with a specific geometry. The laminar airflow (10≤𝑅𝑒≤1000) passes through the inter-fin passages with perforated fins, whose perforations are distributed equally throughout the duct. The effect of duct geometry, which includes corrugation angle (𝜙), cross-section aspect ratio (𝛼=𝐻𝑆𝑎𝑣𝑔⁄), and cross-section inclination angle (𝛹) is parametrically studied. This study has identified the improved performance of the Nusselt number and the Fanning friction factor in a variety of Reynolds numbers. 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 plate-fin 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°.


Main Subjects