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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Experimental and numerical analysis of heat transfer in the helically coiled heat exchanger
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Experimental and numerical analysis of heat transfer in the helically coiled heat exchanger

机译：螺旋盘绕热交换器中传热的实验性和数值分析

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Purpose The knowledge of the heat transfer coefficient is important for the proper design of heat exchangers as well as for the determination of the working medium outlet temperatures. This paper aims to present a method of simultaneous determination of coefficients in correlation formulas for the Nusselt number on both sides of the heat transfer surface. Design/methodology/approach - The idea of the developed method is based on determining such a values of the coefficients in Nusselt number correlations that fulfill the condition of equality between the measured and calculated temperature at the outlet of heat exchanger in terms of least squares method. To test the proposed method, a special experimental installation was built. The heat transfer in helically coiled tube-in-tube heat exchanger was examined for the wide range of temperature changes and volumetric flow rates of working fluid. Findings - The simulation results were validated with an experimental data. The results show that the heat transfer coefficient of the counter-current is higher than the co-current flow in helically coiled heat exchanger. This phenomenon can be beneficial particularly in the laminar flow regime. Research limitations/implications - The correlation for the Nusselt number as a function of the Reynolds and Prandtl numbers for hot and cold liquid was obtained with the least squares method for the experimental data. Practical implications The presented method allows for the simultaneous determination of heat transfer coefficient on both sides of the wall without the necessity of indirect calculation of the overall heat transfer coefficient. The presented method can be used in the thermal design of various type heat exchangers. Originality/value - This work presents the new methodology of determination correlations for the helically coiled tube-in-tube heat exchanger for co-current and counter-current arrangement, which can be used in thermal design.
机译：目的，传热系数的知识对于换热器的适当设计以及用于确定工作介质出口温度的重要性是重要的。本文旨在提出一种同时测定传热表面两侧的营养数的相关公式中的系数。设计/方法/方法 - 开发方法的思想是基于确定在最小二乘法的热交换器出口处的测量和计算温度之间的良好良好数量相关的系数中的这些系数的值。为了测试所提出的方法，建立了一个特殊的实验装置。检查螺旋盘绕管内热交换器的热传递，用于宽范围的温度变化和工作流体的体积流速。调查结果 - 使用实验数据验证仿真结果。结果表明，逆流的传热系数高于螺旋盘绕热交换器的相同流动。这种现象可以特别有利于层流变制度。研究限制/含义 - 用最小二乘法为实验数据的规范方法获得作为热和冷液的雷诺和普朗特数的恢复数和普朗特数的努力的相关性。实际意义呈现的方法允许同时确定墙壁两侧的传热系数，而无需间接计算总传热系数。所提出的方法可用于各种型热交换器的热设计。原创性/值 - 该工作介绍了用于螺旋盘绕管 - 管式热交换器的确定相关性的新方法，用于控制热电流和逆流装置，可用于热设计。

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