Heat transfer enhancement in pillow-plate type heat exchanger with SCWSCs using an entropy and exergy generation approximation technique

Abstract

The design and development of the Pillow-plate heat exchanger (PPHE) are attracting more interest in the research and scientific communities in recent years. In this manuscript, a new investigation is performed to examine the heat transfers and fluid flow characteristics for different streamwise lengths with Staggered Circular Welding Spot Configurations. To analyze the heat transfer and friction factor parameters total of 25 different designs of is considered, 1000 Re 16,000. In addition, to optimizing the exergy efficiency and thermal evaluation factor, some dimensional and non-dimensional thermodynamic and thermal-hydraulic influencers, including thermal and frictional entropy generation, thermal and frictional exergy destruction, Nusselt number, friction factor, Bejan, entropy generation number are calculated by considering the second law efficiency approach based on thermo-dynamics for turbulent single-phase water flow in PPHE as wavy surface using SST transition method and entropy and exergy approximation technique. Based on the computational results obtained, increasing the streamwise lengths with SCWSPs, the ‘elliptical recirculation vortex’ is essential and significantly enhances the thermal performance factor. The maximum exergy and thermal performance factor are improved by 41.58% and 1.54 in the = 0.078 and 0.044 at Re = 1000, respectively.