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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.5

ISSN Imprimir: 2152-5102
ISSN On-line: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v43.i3.30
pages 218-233

Numerical Simulation of Heat Transfer on Simultaneously Developing Flow in Microchannel under Inlet Pulsation

Tapas K. Nandi
Department of Mechanical Engineering, Techno India College of Technology Kolkata, 700156, India
Himadri Chattopadhyay
Department of Mechanical Engineering, Jadavpur University, Kolkata − 700032, West Bengal, India

RESUMO

The present work investigates the effect of inlet pulsation on the transport process in two types of microchannel as circular and wavy microchannel. The flow was both thermally and hydrodynamically developing while the channel walls were kept at a uniform temperature. The inlet velocity varies sinusoidally in time for a range of dimensionless frequencies (St = 1, 5, 10) up to an amplitude of 0.8. The transient solution of two-dimensional Navier−Stokes equation was obtained using the SIMPLE algorithm with the momentum interpolation technique of Rhie and Chow. The simulations were performed in the laminar regime within the Reynolds number range between Re = 0.1 to 100 and Prandtl number 0.7 for both circular and wavy channels. The results of pulsating flow simulation have been analysed and compared with steady flow simulations. It is observed that the effect of pulsation in circular channel is significant only at low Reynolds number (Re ≤ 10) beyond which pulsation has little effect. On the contrary, wavy passage does not provide any significant heat transfer enhancement when the flow is steady, particularly at very low Reynolds number. Significant increase in heat transfer is observed when the flow is made unsteady. Further, non-dimensional pressure difference, friction factor and performance are analysed in this study.


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