An optimization of grooves structure for thermal performance enhancement in microchannel heat sink

ABSTRACTIn the current work, the thermal performance of a grooved microchannel heat sink is evaluated at different offset positions inside the channel. For this purpose, the Eulerian – Eulerian approach-based mathematical model is developed and is numerically solved using the finite volume approach. Water is the base fluid to which alumina nanoparticles were added to enhance heat transfer. The effect of the Reynolds number (100-1000), particle diameter (10 nm- 50 nm), the number of grooves (10-80), offset between the grooves (0-1), and particle volume fraction (0% -5%) on the dimensionless pressure drop, Nusselt number, and coefficient of performance are investigated, and their impact on the microchannel's thermal characteristics is quantified. Most importantly, the microchannels with symmetric (Offset = 0) and asymmetric grooves (Offset ≠ 0) were compared, and it was found that offsetting the grooves has an insignificant effect on the microchannel performance. Furthermore, an empirical correlation is proposed to evaluate the coefficient of performance of both symmetric and asymmetric microchannels as a function of the output variables.DisclaimerAs a service to authors and researchers we are providing this version of an accepted manuscript (AM). Copyediting, typesetting, and review of the resulting proofs will be undertaken on this manuscript before final publication of the Version of Record (VoR). During production and pre-press, errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal relate to these versions also. Additional informationNotes on contributorsPankaj Kumar Pankaj Kumar is a Research Assistant Professor in the Department of Mechanical Engineering, SRM Institute of Science and Technology, Kattankulathur, Chennai-603203, Tamilnadu, India. He has been working in two-phase flow and heat transfer for the past ten years. He has published 16 research papers in international journals focusing on cavitation, two-phase flows, and flow past a circular cylinder.Vishnu Teja Mantripragada Vishnu Teja Mantripragada is an Assistant Professor in the Department of Fuel, Minerals and Metallurgical Engineering, IIT (ISM) Dhanbad, Jharkhand. India. He has been working in multiphase flows and computational fluid dynamics for the past seven years. He has published 12 research papers in international journals focusing on multiphase flows, transport phenomena, droplets, and bubbles.