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首页> 外文期刊>International Journal of Heat and Mass Transfer >The water based Al_2O_3 nanofluid flow and heat transfer in tangential microtube heat sink with multiple inlets
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The water based Al_2O_3 nanofluid flow and heat transfer in tangential microtube heat sink with multiple inlets

机译：多入口切向微管散热器中水基Al_2O_3纳米流体的流动和传热

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摘要

Micro thermal systems are convenient cooling devices for high heat flux applications. Besides, the nano-fluids are used to improve the cooling capabilities. The suspended nanoparticles in the base fluid increase the thermal conductivity, fluid viscosity and fluid density but decrease the effective heat capacity. To analyze the suitability of using the nanofluids for cooling applications, the numerical simulations are made for nanofluid heat transfer and fluid flow in micro-heat sink with straight microtubes and multiple tangential inlet jets. The configurations with five inlet jets is considered and numerical simulations are based on a finite volume method. The Al_2O_3 water based nanofluid was used in simulations. The heat flux spread through the bottom surface of the heat sink was q = 50 W/cm~2. Re from 15 to 100 was considered to simulate the laminar fluid flow. The analysis is based on thermal and hydrodynamic results obtained for nanofluid and compared with results obtained for water. The results are analyzed on a fixed pumping power, Re or mass flow rate basis. It is observed that the conclusions are strongly dependent on the analysis constraint. Moreover the surface temperature difference is not very much improved by using the nanofluid.
机译：微型热系统是用于高热通量应用的便捷冷却设备。此外，纳米流体用于提高冷却能力。基础流体中悬浮的纳米颗粒增加了导热率，流体粘度和流体密度，但降低了有效热容量。为了分析使用纳米流体进行冷却应用的适合性，对具有直的微管和多个切向入口射流的微型散热器中的纳米流体传热和流体流动进行了数值模拟。考虑具有五个入口射流的配置，并且基于有限体积法进行了数值模拟。模拟中使用了Al_2O_3水性纳米流体。散布在散热器底部表面的热通量为q = 50 W / cm〜2。从15到100的Re被认为模拟了层流。该分析基于对纳米流体获得的热和流体动力学结果，并与对水获得的结果进行了比较。在固定泵浦功率，Re或质量流量的基础上分析结果。可以看出，结论在很大程度上取决于分析约束。而且，通过使用纳米流体，表面温差没有太大改善。

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