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首页> 外文期刊>International Journal of Engineering Research and Applications >Heat Transfer & Periodic Flow Analysis of Heat Exchanger by CFD with Nano Fluids
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Heat Transfer & Periodic Flow Analysis of Heat Exchanger by CFD with Nano Fluids

机译：纳米流体CFD对换热器的传热与周期性流动分析

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Many heat transfer applications such as steam generators in a boiler or air cooling coil of an air conditioner, can be modelled in a bank of tubes containing a fluid flowing at one temperature that is immersed in a second fluid in a cross flow at different temperature. CFD simulations are a useful tool for understanding flow and heat transfer principles as well as for modelling these types of geometries. Both the fluids considered in the present study are CUO Nano fluids, and flow is classified as laminar and steady with Reynolds number between 100- 600.The mass flow rate of the cross flow and diameter has been varied (such as 0.05, 0.1, 0.15, 0.20, 0.25, 0.30 kg/sec and 0.8, 1.0.1.2 &1.4cm) and the models are used to predict the flow and temperature fields that result from convective heat transfer. Due to symmetry of the tube bank and the periodicity of the flow inherent in the tube bank geometry, only a portion of the geometry will be modelled and with symmetry applied to the outer boundaries. The inflow boundary will be redefined as a periodic zone and the outflow boundary is defined as the shadow. The various static pressures, velocities, and temperatures obtained are reported. In this present project tubes of different diameters and different mass flow rates are considered to examine the optimal flow distribution. Further the problem has been subjected to effect of materials used for tubes manufacturing on heat transfer rate. Materials considered are copper and Nickle Chromium alloys. Results emphasize the utilization of alloys in place of copper as tube material serves better heat transfer with most economical way.
机译：许多传热应用（例如锅炉中的蒸汽发生器或空调的空气冷却盘管）可以在一组管中建模，这些管包含在一种温度下流动的流体，该流体在另一种温度下以横流的形式浸入第二种流体中。 CFD模拟是了解流动和传热原理以及对这些类型的几何模型进行建模的有用工具。本研究中考虑的两种流体均为CUO纳米流体，其流分类为层流和稳态，雷诺数在100-600之间。横流的质量流率和直径已发生变化（例如0.05、0.1、0.15 ，0.20、0.25、0.30 kg / sec和0.8、1.0.1.2＆1.4cm），并且这些模型用于预测对流换热产生的流场和温度场。由于管束的对称性和管束几何形状固有的流动周期性，将仅对几何形状的一部分进行建模，并且将对称性应用于外部边界。流入边界将重新定义为周期性区域，流出边界将被定义为阴影。报告了获得的各种静态压力，速度和温度。在本发明中，考虑不同直径和不同质量流率的项目管以检查最佳流量分布。此外，该问题还受到用于管制造的材料对传热速率的影响。考虑的材料是铜和镍铬合金。结果强调了用合金代替铜，因为管材以最经济的方式提供了更好的传热效果。

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