Ta. Ozbelge et Tg. Somer, A HEAT-TRANSFER CORRELATION FOR LIQUID-SOLID FLOWS IN HORIZONTAL PIPES, Chemical engineering journal and the biochemical engineering journal, 55(1-2), 1994, pp. 39-44
Heat transfer from a solid surface to a fluid-solid suspension in vert
ical or horizontal transport is of importance in the design of heat-ex
changers, driers, fluidized beds, and slurry pipeline reactors. There
are fewer studies on heat transfer in liquid-solid flows than on gas-s
olid flows. In this paper, a correlation for heat transfer to dilute l
iquid-solid flows in a horizontal pipe is presented. Suspension proper
ties were used to derive the following equation: Nu(s) = 0.202Res0.6Pr
s0.675(D/d(p))0.092(mu(s)/mu(w))-1.95 This correlation can be used to
estimate the heat transfer coefficients of liquid-solid two-phase flow
s for the following ranges of variables: Reynolds number Re(s), 27 000
-120 000; Prandtl number Pr(s), 2.1-3.4; the ratio of suspension visco
sity to the viscosity of water at the wall temperature mu(s)/mu(w), 1.
17-1.83; the ratio of pipe diameter to the particle diameter D/d(p), 1
82-512; volume fraction of solids in the feed slurry C(f), 0.005-0.03.
The accuracy of the correlation is approximately +/-20%.