Document Type : Research Paper


1 Department of Mechanical Engineering, Collage of Engineering, University of Al-Qadisiyah, Ad-Diwaniyah, Iraq.

2 Mechanical Engineering Department, College of Engineering, University of Al-Qadisiyah , Al-Diwaniyah, Iraq.


Improving the thermal design of geometric Heat Sinks (HSs) reduces their size and weight and improves heat dissipation, hence enhancing the speed of electronic devices. In this numerical study, a novel thermal design of HSs is proposed by inserting various forms in order to obtain the optimum thermal design for this type of HSs. This study has two primary objectives: determining the influence of varying types of HSs while maintaining the volume of fins, and introducing new geometries such as circular fin and circular cut fin. The tests were conducted with a heat flux of 11.1 kW/m2 and a Reynolds number (Re) ranging from 2418.56 to 819.19. For forced convection, three-dimensional numerical simulations utilising the Navier–Stokes equations laminar model and energy equation are acquired using the commercially available COMSOL Multi-physics version 5.6a CFD software. The results indicate that. A comparison analysis of HSs with different geometries revealed that the circular-cut shape exhibited the highest thermal efficiency, as measured by the Nusselt number about 153 as well as the heat transfer coefficient and the minimum thermal resistance.