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International Journal of Fluid Mechanics Research
ESCI SJR: 0.206 SNIP: 0.446 CiteScore™: 0.9

ISSN Print: 2152-5102
ISSN Online: 2152-5110

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International Journal of Fluid Mechanics Research

DOI: 10.1615/InterJFluidMechRes.v25.i4-6.210
pages 689-698

Heat Transfer Characteristics of a Finned Horizontal Tube in a FBC

Tae Yong Chung
Department of Mechanical Engineering, Kookmin University, Seoul 132-720, KOREA
Jae Ou Chae
Department of Mechanical Engineering, Inha University, Inchon 420-020, KOREA
Pyung Sam Ji
New Energy Section, Power Generation Department, Research Center, KEPCO, 117-15, Yongjeon-Dong, Dong-ku, Taejon 300-200, KOREA

ABSTRACT

This study is to investigate the characteristics of heat transfer of a horizontal tube, equipped with radial fins of triangular profile, immersed in a high-temperature fluidized bed. The heat transfer variations are compared with those of a smooth tube experimentally.
The finned tubes and smooth tube, with outside and inside diameters of 48.6 mm and 30.6 mm, are made of steel. The depth of the fin is 5 mm and the angles of fin are 25°, 30°, 35°, 40°, 45°, and 50°. Experiments are conducted at three different bed temperatures of 720, 800 and 880°C. A granular refractory (silica sand) is used as bed material with mean particle diameters of 0.96 mm and 1.37 mm.
The maximum heat transfer coefficient is achieved by the rake angle of 25° for the particle size 0.96 mm of bed material, and by the rake angle of 30° for the particle size 1.37 min. These coefficients are about 2 and 1.8 times higher than the case for the smooth tube, respectively. The heat transfer coefficient for the finned tube is greater than that for the smooth tube. Also the rake angle of the finned tube for the maximum heat transfer coefficient changes depending on the particle size of bed material, and the effect of the rake angle becomes more distinct as the bed temperature increases.


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