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首页> 外文期刊>International Journal of Heat and Mass Transfer >Natural convection heat transfer from a bundle of in-line heated circular cylinders immersed in molten solar salt
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Natural convection heat transfer from a bundle of in-line heated circular cylinders immersed in molten solar salt

机译：从一束在线加热圆柱体浸入熔融太阳盐中的自然对流热传递

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摘要

A two-dimensional steady-state natural convection heat transfer from a bundle of closely spaced isother-mally heated cylinders in the in-line arrangement was investigated in this study for a laminar flow regime using numerical analysis. It was determined that flow patterns and heat transfer are strongly affected by the transverse and longitudinal cylinder-to-cylinder spacing S_T and S_L. Rayleigh number, and thermo-physical properties of the heat storage fluid. Performance maps in the form of contour diagrams for the average Nusselt number Nu and dimensionless heat transfer volumetric density q_τ and corresponding correlations are presented for an in-line bundle of 9 × 5 horizontal cylinders immersed in a molten solar salt. The variation of the heat transfer enhancement for the in-line bundle of horizontal cylinders shows that there is an optimal cylinder spacing resulting in the highest heat transfer enhancement. The heat exchanger geometry was optimized by determining the optimal set of the tube (cylinder) spacings Sl/D and S_T/D in the bundle resulting in the maximum volumetric heat transfer rate q_τ and smallest size and lowest cost of a heat exchanger. A set of correlations were developed for the maximum and optimum dimensionless heat transfer volumetric densities as functions of the Rayleigh number Ra_D. The analyzed geometries are important in the solar heating and storage technology, nuclear reactor safety, and waste heat recovery applications.
机译：在本研究中研究了使用数值分析的层流动状态，研究了在线布置中的一束紧密间隔等离子加热圆柱体的二维稳态自然对流热传递。确定流动模式和传热受横向和纵向圆柱 - 缸间隔S_T和S_L的强烈影响。瑞利数，以及储质液的热物理性质。对于平均篮板数Nu和无量纲传热体积密度Q_τ的轮廓图形式的性能图示出了9×5水平圆柱体的线束束缚在熔融太阳盐中的线束上。水平汽缸内束的传热增强的变化表明，存在最佳的汽缸间隔，从而产生最高的传热增强。通过在束中确定最佳的管（圆柱）间隔SL / D和S_T / D来优化热交换器几何形状，导致最大体积传热率Q_τ和热交换器的最小尺寸和最低成本。为最大和最佳的无量度的传热体积体积，作为瑞利数RA_D的功能开发了一组相关性。分析的几何形状在太阳能加热和储存技术，核反应堆安全和废热回收应用中很重要。

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