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Natural convection heat transfer from two horizontal cylinders using a large lateral shearing interferometer

机译：使用大的侧向剪切干涉仪从两个水平滚筒的自然对流传热

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摘要

Natural convection heat transfer from two horizontal cylinders in the air was investigated experimentally and numerically. Two cylinders were spaced at 1.3, 1.8, and 2.7 cylinder diameters horizontally. The experiments were carried out by large lateral shear interferometry (LSI) for various Rayleigh numbers in the range of 10~3 to 10~4. Large LSI is common path interferometry with the advantages of simple structure, strong antivibration, and fewer required optical components. It is not necessary for LSI to perform a complex algorithm to restore wavefront with a large shear amount. Simple and infinite fringe interferograms of the cylinders heated from ambient temperature 282.15 to 723.15 K were obtained. A numerical simulation was carried out with ANSYS-Fluent 18.0. The influence of two factors, the distance between the cylinders, and the Rayleigh number, on the heat transfer of two horizontal cylinders was examined. The average Nusselt number and local Nusselt number were determined from the experimental results and numerical results, respectively, and the two results were in good agreement. The rising direction for the plume flow pattern of each horizontal cylinder was no longer simply vertically upward but was inclined toward the central symmetry axis of the two cylinders. In addition, the heat transfer from a cylinder increased with the cylinder spacing at any Rayleigh number.
机译：通过实验和数值研究来自空气中的两个水平圆筒的自然对流热传递。两个气缸水平地间隔1.3,1.8和2.7缸直径。通过大的横向剪切干涉测定法（LSI）进行实验，其各种瑞利数在10〜3至10〜4的范围内。大型LSI是普通路径干涉测量，结构简单，防振强，所需的光学元件较少。 LSI没有必要执行复杂的算法，以恢复具有大剪切量的波前。获得了从环境温度282.15至723.15k加热的气缸的简单且无限的条纹干涉图。使用ANSYS-FLUENT 18.0进行数值模拟。检查了两个因素，气缸与瑞利数之间的距离的影响，在两个水平圆柱体的传热上进行了影响。分别从实验结果和数值结果确定了平均营养数和局部营养数，两项结果非常一致。每个水平圆筒的羽流量图案的上升方向不再垂直向上，但朝向两个汽缸的中央对称轴线倾斜。另外，来自圆柱体的热传递随着纱线的任何瑞利数而增加。

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  • 来源
    《Heat transfer》 |2021年第4期|3025-3046|共22页
  • 作者

    Jinrong Zhu; Lingyue Wang; Hui Lv; Chunfu Cheng; Jinye Zhang;

  • 作者单位

    School of Science Hubei University of Technology Wuhan Hubei China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan Hubei China;

    School of Science Hubei University of Technology Wuhan Hubei China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan Hubei China;

    School of Science Hubei University of Technology Wuhan Hubei China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan Hubei China;

    School of Science Hubei University of Technology Wuhan Hubei China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan Hubei China;

    School of Science Hubei University of Technology Wuhan Hubei China Hubei Engineering Technology Research Center of Energy Photoelectric Device and System Hubei University of Technology Wuhan Hubei China;

  • 收录信息 美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    lateral shearing interferometry; natural convection heat transfer; numerical analysis; two cylinders;

    机译：横向剪切干涉测量;自然对流传热;数值分析;两个气缸;

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