Fluid Flow Through Packed and Fluidized Systems

From Introduction: "Examination of published correlations revealed that considerable uncertainty existed in the correlation of the operating variables of such equipment with the pressure drops which could be expected through packaged and fluidized systems; correlations proposed in the literature differed from each other frequently by as much as 75 to 100 percent. The following study was begun in 1946 to develop correlations that would be suitable for the design of new equipment in which fluids are brought into contact with granular materials."