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首页> 外文期刊>International journal of nanoscience >Heat Transfer Enhancement Analysis of Al_2O_3-Water Nanofluid Through Parallel and Counter Flow in Shell and Tube Heat Exchangers
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Heat Transfer Enhancement Analysis of Al_2O_3-Water Nanofluid Through Parallel and Counter Flow in Shell and Tube Heat Exchangers

机译：壳管热交换器平行和逆流Al_2O_3水纳米流体的传热增强分析

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摘要

Heat exchanger plays an essential part in industrial sector in transferring the heat energy. Heat is exchanged between fluids in convection and conduction mode through the walls of the heat exchanger. If the heat transfer medium has low thermal conductivity, it will greatly limit the efficiency of the heat exchanger. Whenever the system acts subjected to an increase in the heat load, heat fluxes caused by more power and smaller size, cooling is one of the technical challenges faced by the industries. The objective of this research work is to evaluate the overall heat transfer coefficient through an experimental analysis on the convective heat transfer and flow characteristics of a nanofluid. In our experiment, the nanofluid consists of water and one percentage volume concentration of Al_2O_3-water nanofluid flowing through parallel and counter flow in shell and tube heat exchangers. About 50nm diameter of Al_2O_3 nanoparticles was used in this analysis and found that the overall heat transfer coefficient and convective heat transfer coefficient of nanofluid were slightly higher than those of the base liquid at same mass flow rate and inlet temperature. Here, there are three samples of dissimilar mass flow rates, which have been identified for conducting the experiments and their results are continuously monitored and reported. Finally, the observed results through an experimental investigation were presented and concluded that the enhancement of overall heat transfer coefficient is likely to be feasible by means of increasing the mass flow rate of base fluid and prepared nanofluid on the proportional basis.
机译：热交换器在工业领域起到转移热能的重要组成部分。通过热交换器的壁在对流和导通模式中的流体之间交换热量。如果传热介质具有低导热率，它将极大地限制热交换器的效率。每当系统作用在热负荷增加时，通过更大的功率和更小的尺寸引起的热量，冷却是行业面临的技术挑战之一。该研究工作的目的是通过对纳米流体的对流传热和流动特性进行实验分析来评估整体传热系数。在我们的实验中，纳米流体由水和一个百分比体积浓度的Al_2O_3-水纳米流体流过并平行流动，并在壳管和管热交换器中进行逆流。在该分析中使用约50nm直径的Al_2O_3纳米颗粒，发现纳米流体的总传热系数和对流传热系数略高于基础液体在相同的质量流速和入口温度下的热传递系数。这里，存在三种不同的质量流速样品，已经鉴定用于进行实验，并且它们的结果是连续监测和报道的。最后，提出并结论是通过实验研究的观察结果通过提高基础流体的质量流量并以比例增加纳米流体来增强整体传热系数的增强可能是可行的。

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