In this theoretical study, a fully developed laminar convective water flow in a circular tube is “convectively overloaded” toward the microscale, by decreasing the tube diameter below 1 mm. The entropy generation rate () is obtained (with and without the viscous dissipation term) for a given rate of heat removal using a fixed rate of coolant (water) flow. The uniform wall heat flux and mass flux in a tube increase toward the micro-scale, which is “thermal and flow overloading,” respectively. The variations of— due to fluid friction, fluid conduction heat transfer, and their total (), toward the micro-scale, are analyzed. Since remains more or less the same toward the microscale, it is worth overloading a tube for miniaturization up to the laminar-flow limit.
Entropy Generation in Laminar Forced Convective Water Flow Due to Overloading Toward the Microscale
Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF ENERGY RESOURCES TECHNOLOGY. Manuscript received August 4, 2017; final manuscript received February 24, 2018; published online April 9, 2018. Assoc. Editor: Reza Sheikhi.
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Rastogi, P., and Mahulikar, S. P. (April 9, 2018). "Entropy Generation in Laminar Forced Convective Water Flow Due to Overloading Toward the Microscale." ASME. J. Energy Resour. Technol. August 2018; 140(8): 082002. https://doi.org/10.1115/1.4039608
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