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Three dimensional numerical study on a trapezoidal microchannel heat sink with different inlet/outlet arrangements utilizing variable properties nanofluid | ||
| Challenges in Nano and Micro Scale Science and Technology | ||
| مقاله 7، دوره 6، شماره 2، مهر 2018، صفحه 133-151 اصل مقاله (1.59 M) | ||
| نوع مقاله: Original Research Paper | ||
| شناسه دیجیتال (DOI): 10.22111/tpnms.2018.16509.1100 | ||
| نویسندگان | ||
| Hossien Khorasanizadeh* 1؛ Mojtaba Seperhnia2 | ||
| 1University of Kashan | ||
| 2Uni. of Kashan | ||
| چکیده | ||
| Nowadays, microchannels as closed circuits channels for fluid flow and heat removal are an integral part of the silicon-based electronic microsystems. Most of previous numerical studies on microchannel heat sinks (MCHS) have been performed for a two-dimensional domain using constant properties of the working fluid. In this study, laminar fluid flow and heat transfer of variable properties Al2O3-water nanofluid in a trapezoidal MCHS, consisted of five trapezoidal microchannels have been studied. The three dimensional solution domains include the whole flow field and the complete MCHS solid parts. Four inlet/outlet arrangements, three pressure drops of 5, 10 and 15 kPa and nanoparticles volume fractions between 0 and 4% are assumed and the effects of these arrangements, properties variations and the Brownian motion on the heat sink performance quantified. The results indicate that the A-type heat sink, for which the inlet and outlet are placed horizontally at the center of the north and the south walls, has a better heat transfer performance, smaller thermal resistance and provides more uniform substrate temperature distribution. Temperature-dependent properties increases the heat transfer between 2.7% and 3.39%, decreases the thermal resistance between 3.49% and 6.29 % and decreases the ratio of difference between the maximum and minimum substrate temperatures to the heat flux between 3.3% and 7.19%. Presence of the Brownian motion showed a similar trend but with a slighter importance. | ||
| کلیدواژهها | ||
| Trapezoidal microchannel؛ Trapezoidal heat sink؛ Variable properties nanofluid؛ Inlet/outlet arrangements؛ KKL Brownian motion model | ||
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