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首页> 外文期刊>International journal of numerical methods for heat & fluid flow >Numerical study of surface radiation and combined natural convection heat transfer in a solar cavity receiver
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Numerical study of surface radiation and combined natural convection heat transfer in a solar cavity receiver

机译：太阳腔接收器表面辐射和自然对流联合传热的数值研究

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Purpose - The purpose of this paper is to present the numerical solutions of surface radiation and combined natural convection heat transfer in a solar cavity receiver. The paper aims to discuss sundry issues that take place in the saidmodel. Design/methodology/approach - The numerical solutions are developed by means of second-order upwind scheme using the SIMPLE algorithm. Findings - The effects of physical factors such as Rayleigh number (10~4 ≤ Ra ≤ 10~6), inclination angels of insulated walls (0° ≤ θ ≤ 10°) and the wall surface emissivity (0° ≤ ϵ ≤ 1) on natural convection-surface radiation heat transfer rate are analyzed. Impact of sundry parameters on flow quantities are discussed and displayed via graphs and tables. Stream lines and isothermal lines have also been drawn in the region of cavity. The numerical results reveal that increasing the Rayleigh number, wall surface emissivity and inclination angels of insulated walls in an open cavity enhances the mean total Nusselt number. The variations of the surface radiation and natural convection heat transfer mean Nusselt numbers are very small to the inclination angle of θ, while a significant change is noted for the case of Rayleigh number and emissivity. Originality/value - To the best of authors' knowledge, this model is reported for the first time.
机译：目的-本文的目的是提出太阳辐射接收器中表面辐射和自然对流组合传热的数值解。本文旨在讨论上述模型中发生的各种问题。设计/方法/方法-使用SIMPLE算法，通过二阶迎风方案开发数值解。结果-诸如瑞利数（10〜4≤Ra≤10〜6），绝缘墙的倾斜角度（0°≤θ≤10°）和壁面发射率（0°≤ϵ≤1）等物理因素的影响对自然对流面辐射的传热速率进行了分析。讨论并通过图形和表格显示各种参数对流量的影响。在腔体区域也画出了流线和等温线。数值结果表明，增加开放腔中隔热壁的瑞利数，壁面发射率和倾斜角度可提高平均总Nusselt数。表面辐射和自然对流传热的平均努塞尔数的变化相对于θ的倾斜角非常小，而瑞利数和发射率的情况则有明显变化。原创性/价值-据作者所知，该模型是首次报道。

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