Abstract
This paper presents an experimental study of heat transfer between a shallow fluidized bed and the surface of a single horizontal tube and a tube bundle, which is immersed in it. Carbon, which is prepared from the Date stones, is used as a solid to be fluidized and a compressed air as an external fluid. The results showed that the overall heat transfer coefficient of tubes bundle, which immersed in fluidized bed is lower than single tube. The modified correlations and analysis are offered by experimental work, which shows the relations between heat transfer coefficient and superficial mass velocity. Key word: heat transfer - heat exchangers - fluidized bed heat exchangers
Highlights
The results showed that the overall heat transfer coefficient of tubes bundle, which immersed in fluidized bed is lower than single tube
The over all heat transfer coefficient is obtained and is variation its shown with superficial mass velocity in figures (3,4 )
Figure (3) shows that the heat transfer coefficient varies with the velocity approaching to an optimum for single tube, and fig ( 4 ) for the tube bundle
Summary
The results showed that the overall heat transfer coefficient of tubes bundle, which immersed in fluidized bed is lower than single tube. ¿»ƁŔ řŸƔƈƈ řƂŗų Ɠž ŘũƏƈżƈƅŔ ŖƔŗŕƊƗŔ Ɖƈ řŷƏƈŠƈƅ ƓƆƄƅŔ ŘũŔũţƅŔ ¿ŕƂśƊŔ ¿ƈŕŸƈ ƉŌ ƑƆŷ şœŕśƊƅŔ Śƅŧ Several measurements have been reported for heat transfer to or from a tube immersed horizontally in a fluidized bed [ 2-8 ]. The effects of fluidizing velocity, particle size, shape and density, tube diameter and the bed temperature on the heat transfer coefficient were investigated.
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