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Sarit Kumar Das
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Sarit Kumar Das
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Sarit Kumar Das
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Das, Sarit
Das, S. K.
Das, Sarit Kumar
Kumar Das, Sarit
Das, Sarit K.
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2 results
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- PublicationParticle and thermohydraulic maldistribution of nanofluids in parallel microchannel systems(01-07-2016)
;Maganti, Lakshmi Sirisha ;Dhar, Purbarun ;Sundararajan, T.A deep understanding of fluidic maldistribution in microscale multichannel devices is necessary to achieve optimized flow and heat transfer characteristics. A detailed computational study has been performed using an Eulerian–Lagrangian twin-phase model to determine the concentration and thermohydraulic maldistributions of nanofluids in parallel microchannel systems. The study reveals that nanofluids cannot be treated as homogeneous single-phase fluids in such complex flow situations, and effective property models drastically fail to predict the performance parameters. To comprehend the distribution of the particulate phase, a novel concentration maldistribution factor has been proposed. It has been observed that the distribution of particles does not entirely follow the fluid flow pattern, leading to thermal performance that deviates from those predicted by homogeneous models. Particle maldistribution has been conclusively shown to be due to various migration and diffusive phenomena such as Stokesian drag, Brownian motion and thermophoretic drift. The implications of particle distribution on the cooling performance have been illustrated, and smart fluid effects (reduced magnitude of maximum temperature in critical zones) have been observed for nanofluids. A comprehensive mathematical model to predict the enhanced cooling performance in such flow geometries has been proposed. The article clearly highlights the effectiveness of discrete phase approach in modeling nanofluid thermohydraulics and sheds insight on the specialized behavior of nanofluids in complex flow domains. - PublicationExperimental study of two phase flow boiling heat transfer and pressure drop of water in a minitube(01-01-2014)
;Aravinthan, M.; Balakrishnan, A. R.The present work focuses on two phase heat transfer and flow boiling pressure drop in a horizontal circular minitube with deionized water as a working fluid. The experiments were conducted in a 316 stainless steel tube with 1.21 mm inside diameter and a heated length of 276 mm. The present study analyzed the two phase heat transfer and two phase pressure drop at various values of mass flux and heat flux. The operating parameters used were mass flux from 1077 kg/m2s to 1915 kg/m2s and degree of inlet subcooling of 30 °C, 35 °C, 40 °C with heat flux from 20 to 200 kW/m2. The experimental results of two phase heat transfer coefficient were compared with micro-scale and conventional correlations from the literature. It was found that the heat transfer is distinctly different from those predicted by conventional correlations and is closer to minichannel correlations available in the literature.