J.J. BARKER
HEAT TRANSFER IN FLUIDIZED BEDS Part 2 of a review of the significant literature dealing with particle-to-fluidheat transfer coefficients. In addition to critical comment on some of the problems involved with designing fluidized systems, the author provides a graphical SUMmary of existing correlations extracted f rom an extensive bibliography t is impossible to “understand” particle-to-fluid heat transfer in fluidized beds without “understanding” their flow behavior. Evidently no one has mastered this subject, least of all the present author. The best short papers on the subject of fluidized beds and their peculiarities are those by Frantz (B69, B70), Bannister (B78, B79), and Rowe (B769, B770). More extensive discussion of the subject is given by Davidson and Harrison (B49). For general background, the book by Zenz and Othmer (B240) is recommended. The information found in the literature is summarized in Table 11 and in Figure 1. The largest part of the variation evident in Figure 1 disappears when it is realized that the heat transfer coefficients in the various correlations are not all the same, but depend upon the definitions chosen by the investigator for the temperature difference and the heat transfer surface area. , I n general, those results indicating low j , s (
