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Natural convection heat transfer using water-based nanofluid in a shell and helical coil heat exchanger
Chemical Papers ( IF 2.2 ) Pub Date : 2021-01-10 , DOI: 10.1007/s11696-020-01490-x
T. Srinivas , A. Venu Vinod

Industry is looking for more efficient ways to use nanomaterials to decrease water consumption. The addition of greater thermal conductivity nanoparticles to the water enhances the fluid's thermal conductivity and, thus, increases the coefficient of heat transfer. In this work, water-based nanofluids were used to perform heat transfer enhancement studies in a shell and helical coil heat exchanger. Natural convection heat transfer using three water-based nanofluids (Al2O3, CuO and TiO2/water) was investigated in shell and helical coil heat exchanger. Experiments were performed at different hot water flow rates through coil (Dean number) and hot water feed temperatures (40, 50 and 60 °C). The use of water-based nanofluid led in a greater coefficient of shell-side heat transfer compared to the use of pure water on the shell side. The Nusselt number improved due to an increase in nanoparticle concentration. It was observed that with a rise in nanofluid concentration, Dean number and greater coil-side fluid feed temperature, the Rayleigh number increased.



中文翻译:

在壳体和螺旋盘管热交换器中使用水基纳米流体进行自然对流换热

工业界正在寻找使用纳米材料来减少水消耗的更有效方法。向水中添加更大的热导率纳米颗粒可增强流体的热导率,从而增加热传递系数。在这项工作中,使用水基纳米流体在壳管和螺旋盘管热交换器中进行传热增强研究。使用三种水性纳米流体(Al 2 O 3,CuO和TiO 2)的自然对流换热/水)在壳管和螺旋盘管热交换器中进行了研究。实验是通过盘管的不同热水流量(Dean数)和热水进料温度(40、50和60°C)进行的。与在壳侧使用纯水相比,水基纳米流体的使用导致壳侧传热系数更大。由于纳米粒子浓度的增加,Nusselt数得到了改善。观察到随着纳米流体浓度,迪安数的增加和线圈侧流体进料温度的升高,瑞利数增加。

更新日期:2021-01-10
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