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Experimental heat transfer behavior of graphite-water microfluid in a coiled agitated vessel

机译：盘绕搅拌容器中石墨水微流体的实验传热行为

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摘要

Agitation is one of the widely used engineering operations in all of the chemical industries, which involves both material transport and heat transfer in the system. In order to conserve energy spent in heat transfer systems, enhancements to heating and cooling in industrial processes can be achieved by dispersing small-sized particles having high thermal conductivity in a base fluid. This article reports an experimental study on the heat transfer characteristics of graphite-water microfluid in a coiled agitated vessel equipped with propeller and six bladed disc turbine impellers. The heat transfer coefficient for the graphite-water microfluid is found to be higher than that for the base fluid (water) and increased with higher volume concentrations of graphite and higher impeller speed. Comparison of the graphite-water microfluid and water is found to demonstrate a significant enhancement in the con-vective heat transfer coefficient. Empirical correlations for the calculation of Nusselt numbers are performed, and the calculated Nusselt number is found to be in good agreement with experimental values within ±10% deviation.
机译：搅拌是所有化学工业中广泛使用的工程操作之一，涉及系统中的物料运输和热传递。为了节省在传热系统中花费的能量，可以通过将具有高导热率的小尺寸颗粒分散在基础流体中来实现工业过程中加热和冷却的增强。本文报道了在装有螺旋桨和六个叶片盘式涡轮叶轮的盘绕搅拌容器中石墨-水微流体传热特性的实验研究。发现石墨-水微流体的传热系数高于基础流体（水）的传热系数，并且随着石墨的较高体积浓度和更高的叶轮速度而增加。发现石墨-水微流体与水的比较表明对流传热系数显着提高。进行了用于计算Nusselt数的经验相关性，发现计算出的Nusselt数与±10％偏差以内的实验值高度吻合。

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