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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Experimental study of nanofluid flow and heat transfer over microscale backward- and forward-facing steps
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Experimental study of nanofluid flow and heat transfer over microscale backward- and forward-facing steps

机译：纳米流体向前和向后微步流动和传热的实验研究

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This paper investigates experimentally the effects of laminar nanofluid flow over the microscale backward-facing step (MBFS) and forward-facing step (MFFS) on the heat transfer characteristics. The experiments were implemented on MBFS and MFFS with a step height of 600 mu m. Both MBFS and MFFS have the upstream and downstream lengths of 0.1 m and 0.15 m respectively. The Reynolds number ranged of 280-480. The concentrations of SiO2 nanoparticle valued at 0.005 and 0.01 with a diameter of 30 nm were immersed in a distilled water. The experimental results revealed that the concentration of 0.01 water-SiO2 nanofluid recorded the highest Nusselt number. The comparison between MBFS and MFFS revealed that the highest Nusselt number is obtained through the use of the MFFS, which is approximately twice that of MBFS. However, the friction factor recorded a higher value for MFFS. The experimental results were in a good agreement with the numerical published results. (C) 2015 Elsevier Inc. All rights reserved.
机译：本文实验研究了层状纳米流体在微尺度向后步骤（MBFS）和向前步骤（MFFS）上对传热特性的影响。实验在MBFS和MFFS上进行，步高为600微米。 MBFS和MFFS的上游和下游长度分别为0.1 m和0.15 m。雷诺数范围为280-480。将浓度为0.005和0.01，直径为30nm的SiO 2纳米颗粒的浓度浸入蒸馏水中。实验结果表明，浓度为0.01的水-SiO2纳米流体的Nusselt数最高。 MBFS和MFFS的比较显示，通过使用MFFS可获得最高的Nusselt值，大约是MBFS的两倍。但是，摩擦系数记录了较高的MFFS值。实验结果与数值结果吻合良好。 （C）2015 Elsevier Inc.保留所有权利。

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