Transport Phenomenon of Simultaneously Developing Flow and Heat Transfer in Twisted Sinusoidal Wavy Microchannel under Pulsating Inlet Flow Condition

Abstract

Heat transfer operations in microchannel are of special relevance in designing micro-devices involving accumulation of high heat flux. The current study explores simultaneously developing, unsteady laminar flow inside a twisted sinusoidal wavy microchannel and heat transfer involved. A square cross-sectioned channel is taken for the study. The channel is wavy in nature as well as twisted about the flow axis. The modified geometry helps in enhancing out of plane mixing of the fluid and formation of recirculation inside the flow. The evaluation is performed for a Reynolds number range of 1–100. A sinusoidal (varying with time) normal velocity component is employed at the inlet. The study was conducted over a range of pulsation amplitude and frequency. To solve the governing equations, a finite volume based method was employed. The Nusselt number data shows significant enhancement for the sinusoidal inlet velocity as compared to that of a steady case. In terms of pressure drop, the proposed design shows that at different frequencies and amplitudes, it can keep the pressure drop within admissible limits. Entropy generation is used as the measure of dissipated energy. Performance in terms of entropy generation is also reported.

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Notes on contributors

Sampad Gobinda Das

Sampad Gobinda Das is pursuing Ph.D. in Mechanical Engineering Department, from Jadavpur University, West Bengal, India. He has completed his Master’s degree in Mechanical Engineering from Jadavpur University, Kolkata, India. He received his B.Tech degree from Kalyani Government Engineering College, Kalyani, West Bengal, India in Mechanical Engineering. His research interest lies in CFD in fluid flow and heat transfer, specializing on laminar, turbulent, steady, unsteady separated flows and convective heat transfer enhancement.

Suvanjan Bhattacharyya

Suvanjan Bhattacharyya is currently working as an Assistant Professor in the Department of Mechanical Engineering of Birla Institute of Technology and Science Pilani, Pilani Campus, Rajasthan, India. He completed his post-doctoral research from University of Pretoria, South Africa. He completed his Ph.D. in Mechanical Engineering from Jadavpur University, Kolkata, India. He received his Master’s degree from Indian Institute of Engineering, Science and Technology, India (Formerly, Bengal Engineering and Science University), on Heat-Power Engineering. His research interest lies in CFD in fluid flow and heat transfer, specializing on laminar, turbulent, steady, unsteady separated flows and convective heat transfer, experimental heat transfer enhancement. He is the author and coauthor of 85 papers in high ranked journals and prestigious conference proceedings with an H-index of 12. He has bagged best paper award in a number of International conferences as well. He is also on editorial boards of 11 international journals and reviewer of more than 25 prestigious journals.

Himadri Chattopadhyay

Himadri Chattopadhyay is Professor of Mechanical Engineering of Jadavpur University, Kolkata, India. He has served at CSIR-Central Mechanical Engineering Research Institute, Durgapur as Scientist before joining the current faculty position. He was the Director of School of Bioscience and Engineering of Jadavpur University for two years. He has more than 220 papers in journals and conferences and edited two proceedings. He has more than 2500 citations with an H-index of 29. His research domain of interest includes thermo-fluid science, CFD, turbulence, heat transfer augmentation, jet impingement, bio-engineering, materials processing and energy. He is a recipient of DAAD fellowship and DAAD Re-invitation Fellowship. He is fellow of Institution of Engineers, India and West Bengal Academy of Science and Technology.

Ali Cemal Benim

Ali Cemal Benim received his B.Sc. and M.Sc. in Mechanical Engineering from the Bosphorus University of Istanbul, Turkey, and Ph.D. degree from the University of Stuttgart, Germany in1988. Following his Postdoctoral period at the University of Stuttgart, he joined ABB Turbo Systems Ltd. in Baden, Switzerland in 1990. He was the Manager of the Computational Flow and Combustion Modeling group. Since 1996, he is a Professor for Flow Simulation and Energy Technology at the Düsseldorf University of Applied Sciences, Germany.