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.
Highlights
In the modern era of high speed computing and intensive use of integrated circuits, the thermal management of devices has become a key area where improvements can be brought
The current study investigates numerically the simultaneously developing unsteady laminar flow and heat transfer inside a twisted sinusoidal wavy microchannel
This is caused by the weak swirl generation at low Reynolds number (Re) as the viscous force predominates in that case over the effect of the channel geometry
Summary
In the modern era of high speed computing and intensive use of integrated circuits, the thermal management of devices has become a key area where improvements can be brought. An experimental and theoretical investigation on single-phase heat transfer in micro channels was done by Hetsroni et al [9] They discussed several aspects of flow in micro-channels as pressure drop, transition from laminar to turbulent etc. They analysed the data of heat transfer in micro-channels with hydraulic diameters ranging from 60 μm to 200 μm They discussed the effects of geometry, axial heat flux due to thermal conduction through the working fluid and channel walls as well as the energy dissipation. Gogineni et al [13] investigated for laminar convective heat transfer co-efficient in a rectangular micro-channel under constant wall heat flux They worked on Reynolds Number ranging between 100 – 400. The main aim was to enhance heat transfer rate by increasing recirculation and mixing of the flowing fluid
Sign-in/Register to view highlights & summary Sign-in/Register to access full text options 
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
