Abstract
AbstractFlow visualization of flowing particles around a tube of various types of tube arrangements in a moving bed was studied using X‐ray video films to obtain a relation between particles behavior and local heat‐transfer coefficients. A stagnant part of solid particles was observed on the tube in the case of a staggered arrangement. This part did not appear in the case of the single tube and the single row of tubes. The measured local heat‐transfer coefficients around a tube was decreased in this stagnant part. Furthermore, influences of different tube arrangements both on flow patterns of particles and on local heat‐transfer coefficients between tubes and bed were examined.
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