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Heating and cooling of flocculated and non‐flocculated slurries in tubular heat exchangers
Author(s) -
Crewe G. F.,
Simons H. P.
Publication year - 1973
Publication title -
the canadian journal of chemical engineering
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.404
H-Index - 67
eISSN - 1939-019X
pISSN - 0008-4034
DOI - 10.1002/cjce.5450510505
Subject(s) - slurry , turbulence , heat exchanger , materials science , thermodynamics , flocculation , heat transfer , chemistry , physics , organic chemistry
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 p G) (C pμLe Bϕ/K 1 ) 2;3 = 0.027(DVρ/μLe Bϕ ) 0.2 11%ω < %ω Solids < 24%ω Maximum Deviations: + 19.3%, − 17.8% B. Non‐flocculated coal slurries J w = (h/C p G)(C p μLe Bϕ /k w ) 2/3 e −Bϕ/4 ) =0.0285 (DVρ/ μLe Bϕ ) −0.2 13% w > %w Solids < 33.5%. Maximum Deviations: + 17.8%, ‐ 11.1%