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Analysis and Optimization of Trapezoidal Grooved Microchannel Heat Sink Using Nanofluids in a Micro Solar Cell

School of Mechanical Engineering, Hangzhou Dianzi University, Hangzhou 310018, China
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Entropy 2018, 20(1), 9; https://doi.org/10.3390/e20010009
Received: 15 November 2017 / Revised: 7 December 2017 / Accepted: 20 December 2017 / Published: 25 December 2017
(This article belongs to the Special Issue Non-Equilibrium Thermodynamics of Micro Technologies)
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Abstract

It is necessary to control the temperature of solar cells for enhancing efficiency with increasing concentrations of multiple photovoltaic systems. A heterogeneous two-phase model was established after considering the interacting between temperature, viscosity, the flow of nanofluid, and the motion of nanoparticles in the nanofluid, in order to study the microchannel heat sink (MCHS) using Al2O3-water nanofluid as coolant in the photovoltaic system. Numerical simulations were carried out to investigate the thermal performance of MCHS with a series of trapezoidal grooves. The numerical results showed us that, (1) better thermal performance of MCSH using nanofluid can be achieved from a heterogeneous two-phase model than that from single-phase model; (2) The effects of flow field, volume fraction, nanoparticle size on the heat transfer enhancement in MCHS were interpreted by a non-dimensional parameter NBT (i.e., ratio of Brownian diffusion and thermophoretic diffusion). In addition, the geometrical parameters of MCHS and the physical parameters of the nanofluid were optimized. This can provide a sound foundation for the design of MCHS. View Full-Text
Keywords: micro solar cell; nanofluid; microchannel heat sink; heat transfer enhancement; numerical simulation micro solar cell; nanofluid; microchannel heat sink; heat transfer enhancement; numerical simulation
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Wang, R.; Wang, W.; Wang, J.; Zhu, Z. Analysis and Optimization of Trapezoidal Grooved Microchannel Heat Sink Using Nanofluids in a Micro Solar Cell. Entropy 2018, 20, 9.

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