PARTIUE FLOW AND CONTACf HEAT TRANSFER CHARACTERISTICS OF STIRRED GRANULAR BEDS

This paper presents a new contact heat transfer model for estimation of wallto- bed heat transfer rates based exclusively on information on particle flow and mixing within a stirred granular bed. The effects of solids flow ability, bed height, blade rotational speed, size of the annular wall-to-blade clearance, vessel diameter and aeration of the bed on the overall solids mixing patterns, particle renewal rates and contact heat transfer in vessels agitated with flat paddles are presented and discussed. The model is shown to yield satisfactory agreement With expenrnental data.