首页> 外文期刊>International Journal of Heat and Mass Transfer >Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water-ethylene glycol nanofluids
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Backward-facing step heat transfer of the turbulent regime for functionalized graphene nanoplatelets based water-ethylene glycol nanofluids

机译:功能化石墨烯纳米片基水-乙二醇纳米流体的湍流形式的向后步进传热

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摘要

Herein, an experimental study on thermo-physical properties of ethylene glycol-functionalized graphene nanoplatelets/water-ethylene glycol nanofluids (EGGNP-WEG) and a numerical study on the convective heat transfer over a backward-facing step are performed. Accordingly, EGGNP was first synthesized cova-lently to achieve a stable colloidal solution in water-ethylene glycol mixture. Some characterizations were applied to analyze the surface functionality and morphology of EGGNP-flakes. To study the convective heat transfer coefficient in turbulent regime, a numerical study is performed at different weight fractions of EGGNP. According to the results, a higher weight concentration of EGGNP in basefluid indicates a greater extent of convective heat transfer coefficient and thermal conductivity, implying higher heat transfer rate over a backward-facing step.
机译:在这里,进行了乙二醇官能化的石墨烯纳米片/水-乙二醇纳米流体(EGGNP-WEG)的热物理性质的实验研究和对流传热在向后步骤的数值研究。因此,EGGNP首先被共价合成以在水-乙二醇混合物中获得稳定的胶体溶液。一些表征被应用于分析EGGGP薄片的表面功能和形态。为了研究湍流状态下的对流换热系数,对EGGNP的不同重量分数进行了数值研究。根据结果​​,EGGNP在基液中的重量浓度越高,表示对流传热系数和热导率的程度越高,这意味着在朝后的步骤中传热速率更高。

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