Effect of Relative Waviness on Low Re Wavy Microchannel Flow

A 3-D, steady, conjugate numerical model is used to study the effect of waviness on laminar fluid flow and heat transfer characteristics associated with microsized wavy channels. The numerical model has been validated against available experimental data. It is observed that transition Re and average...

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Bibliographic Details
Published in:Journal of the Institution of Engineers (India) Series C 2020-08, Vol.101 (4), p.661-670
Main Authors: Krishna, Mithun, Deepu, M., Shine, S. R.
Format: Article
Language:English
Subjects:
Aerospace Technology and Astronautics
Computational fluid dynamics
Engineering
Fluid flow
Friction factor
Industrial and Production Engineering
Laminar flow
Laminar heat transfer
Mathematical models
Mechanical Engineering
Microchannels
Numerical models
Original Contribution
Secondary flow
Three dimensional flow
Three dimensional models
Vorticity
Waviness
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Summary:A 3-D, steady, conjugate numerical model is used to study the effect of waviness on laminar fluid flow and heat transfer characteristics associated with microsized wavy channels. The numerical model has been validated against available experimental data. It is observed that transition Re and average Nu are functions of waviness of the channel; however, friction factor remained constant at higher waviness. The augmentation of Nu with waviness is found to be resulting from increased levels of recirculation and secondary flows. Peak vorticity levels showed an increase of six times when relative waviness increased from 0.03 to 0.3 and is about 2.5 times when Re increased from 100 to 200. The effect of chaotic advection is not observed even for higher waviness channels at Re = 100.
ISSN:2250-0545
2250-0553
DOI:10.1007/s40032-020-00575-6