Truncated Double Layer Microchannel Heat Sink and Its Performance Improvement by Implicating Secondary Channel Combined along with Appropriate Cavities and Ribs in Channel Flow

Abstract

The reliability of double layer microchannel heat sink can be upgraded if the top liquid channel is made shorter or truncated. Because heating effect on the bottom channel coolant caused by top the channel’s hot coolant is relieved for truncated double layer microchannel heat sink. In the present study, the performance parameters of truncated double layer microsinks have been improved by utilizing secondary sub-channel, appropriate cavities, and ribs in their flow channels. In the primary analysis, before utilizing appropriate secondary sub-channel, cavities, and ribs, truncation effect of the upper channel is evaluated by varying design variable, i.e., truncated length ratio from 0.5 to 1, where truncated length ratio = 0.8 has been found as optimum value. In the second analysis, the design variable, i.e., cavity width–depth ratio of 2.4, 3.2, 3.6 for the optimally truncated double layer microsinks possessing secondary channel, cavities, and ribs, are compared. In this study of total eight cases, 43% and 29% enhancement in Nusselt number ratio and thermal performance factor respectively are optimally predicted in the heat sink designs by implicating the appropriate secondary channel, cavities, and ribs into the flow channel.

Aknowledgements

The authors gratefully acknowledge the organizing committee and all other committees of International Conference on Futuristic Advancement in Materials, Manufacturing and Thermal Sciences (ICFAMMT-2022).

Additional information

Notes on contributors

Dipak Debbarma

Dipak Debbarma is a PhD scholar in the Department of Mechanical Engineering at National Institute of Technology, Silchar, Assam, India. He completed his Bachelor of Engineering in Mechanical Engineering in 2003 and Master in Thermal Science and Engineering in 2017 from National Institute of Technology, Agartala (erstwhile Tripura Engineering College), Tripura, India. He is currently an Assistant Professor in the Department of Mechanical Engineering, Tripura Institute of Technology, India. He had also worked as a Lecturer in National Institute of Technology, Agartala. His research interests include study of heat transfer characteristics of heat exchange devices, such as microchannels and radiators.

Krishna Murari Pandey

Krishna Murari Pandey is serving as a Professor in Mechanical Engineering Department at National Institute of Technology (NIT), Silchar, Assam, India, since June 2006. He has also served as Head of the Department for two terms of three years each. He has acted as member of BOG of NIT Silchar in two terms, i.e., for a total period of four years. He is serving in NIT Silchar since January 6, 1987. He has also worked as Faculty Consultant in Colombo Plan Staff College, Manila, Philippines as Seconded faculty from Government of India in the year 2002. He obtained his B.Tech. in Mechanical Engineering from BHUIT, Varanasi, in 1980. He did M.Tech. in Heat Power from the same Institute in 1987. He did his PhD in Mechanical Engineering in 1994 from IIT Kanpur. He has publications of more than 80 research papers in SCI/SCIT/SCIE journals and he has got 212 Scopus indexed research papers. He is also Academic Editor of SCIE Journal “Mathematical Problems in Engineering” of Hindawi Publication, USA, for more than one year. His research area includes computational fluid mechanics, computational combustion, high speed flows, aerodynamics, numerical and experimental heat transfer and human resource management.

Abhishek Paul

Abhishek Paul is an Assistant Professor in Mechanical Engineering Department at National Institute of Technology, Silchar, Assam, India. He had received his B.E. in Mechanical Engineering in 2008, M.Tech. in Thermal Science and Engineering in 2011 and PhD in 2015 from National Institute of Technology (NIT), Agartala. His primary research area is internal combustion engine and alternative fuels. He has 17 research articles in his research field till date in various prestigious international journals. He is a regular reviewer of various energy-related SCI indexed journals.