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기체유동상과 수평관 사이의 열전달

Heat Transfer between Gas Fluidized Bed and Vertical Tubes

HWAHAK KONGHAK, April 1979, 17(2), 85-98(14), NONE
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Abstract

유동층과 유동층내에 삽입된 수직 열전달관 사이의 발표된 총괄열전달계수식들을 종합하였다. 유체의 속도, 입자의 크기, 입자의 농도, 입자와 유체의 열물리적 특성, 수직 열전달관의 위치, 유동층의 압력, 충진물의 특성 등이 총괄 열전달계수에 미치는 영향을 검토하였다. 열전달의 기본과정을 이해하기 위하여 유동층과 유동층 벽사이의 열전달에 관하여 조사하였다. 이제까지 보고된 유동층과 유동층내의 수직관 사이의 총괄 열전달계수식들을 조사 비교한 결과 Tamarin과 Khasanov의 실험식이 가장 유용하게 사용될 수 있음을 알았다.
Overall heat transfer coefficient correlations are given for fluidized bed in which vertical tubes are immersed. Correlations available in the literature are surveyed and compared on a consistant basis. Effects of mass flow rate, particle size, solid concentration, solid and fluid thermophysical properties, immersed tube location, bed pressure and packing materials on heat transfer coefficients were summarized. In order to understand the fundamental mechanisms of heat transfer, wall to fluidized bed heat transfer is also reviwed. Those correlations on overall heat transfer coefficients are evaluated and find that the most appropriate one for predicting overall heat transfer coefficients between fluidized bed and vertically immersed tubes is one of Tamarin and Khasanov.

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