Effect of Taper and Perforation on Heat Transfer Coefficient of a Passive Horizontal Heat Sink

Abstract

The present study focuses on the numerical investigation of a passive horizontal base heat sink with perforated fins. Fins of the rectangular and trapezoidal cross-section are considered for the study. A detailed parametric numerical study is carried out considering the thickness ratio range (0.33–1); 4–6 mm size of square perforation; 6, 12, and 18 number of perforation and Rayleigh number 592–3044. Significant effect of thickness ratio, size of square perforation, and the number of perforations is observed on the heat transfer coefficient. The heat transfer coefficient increases with the decrease in the thickness ratio and increases with the number of perforation and size of square perforation in trapezoidal cross-section fins. 11.7% of increment in heat transfer coefficient was observed in perforated heat sink when it is compared to the non-perforated heat sink. Mass of the passive heat sink decreases with an increase in the size of perforation, number of perforations, and decrease in the thickness ratio. Mass reduction of up to 58% is observed in perforated heat sinks. A significant improvement in the performance factor is observed for the present study parameters range of Rayleigh number, the thickness ratio, size of perforation, and the number of perforations.

Additional information

Notes on contributors

Dushyant Singh

Dushyant Singh did his bachelor’s degree in mechanical engineering and master’s degree in specialization of mechanical engineering: computational fluid dynamics and heat transfer. He finished his doctorate’s degree in mechanical engineering from Indian Institute Technology, Delhi in 2014. He was postdoctoral researcher in joint research industrial project work with BHEL industry in IIT Delhi. He has been a faculty member in the Department of Mechanical Engineering at National Institute of Technology Manipur-India, since 2015. His research interests include experimental and computational fluid flow – heat transfer, turbulence, and two-phase heat transfer enhancement.

Ayush Kumar Rao

Ayush Kumar Rao is a master’s degree program Thermal and Fluids Engineering student in the Department of Mechanical Engineering at National Institute of Technology Manipur, India. He obtained his Diploma in Engineering from G.B. Pant Polytechnic Delhi, India and Bachelor’s in Engineering from S.L.I.E.T. Punjab, India. His topic of research is heat transfer enhancement.

Udayraj

Udayraj is an Assistant Professor in the Department of Mechanical Engineering at the Indian Institute of Technology Bhilai, India. He received his Ph.D. degree from the Indian Institute of Technology Delhi in 2017. He has worked with the Institute of Textile & Clothing, The Hong Kong Polytechnic University, Hong Kong, as a postdoctoral fellow. His research areas are computational fluid dynamics, heat transfer through thermal protective fabric, thermal comfort and building heat transfer. He has authored more than 40 international journal and conference papers.