Heating and cooling of flocculated and non-flocculated slurries in tubular heat exchangers

The distinctly different turbulent heat transfer characteristics of flocculated kaolin slurries are compared with nonflocculated coal slurries via modified J-factor correlation forms for tubular exchangers. Both slurry types were statistically best-fitted with the approximate solution Bingham plastic flow model in preference to the local shear power law. In addition, the first known turbulent slurry heat transfer cooling results are presented along with the heating results. No distinction was made between heating and cooling correlation forms because of a random scatter of experimental points. Experimental results were interpreted as follows A. Flocculated kaolin slurries J_H = (h/C_pG) (C/K₁)^2;3= 0.027(DVρ/μLe^B?)^0.2 11%ω < %ω Solids < 24%ω Maximum Deviations: + 19.3%, ? 17.8% B. Non-flocculated coal slurries J_w = (h/C_pG)(C_pμLe^B?/k_w)^2/3e^?B?/4) =0.0285 (DVρ/ μLe^B?)^?0.2 13%_w > %w Solids < 33.5%. Maximum Deviations: + 17.8%, - 11.1%