科研之友
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摘要
Dimensionless correlations for estimating heat transfer coefficients (U and h(fp)) in canned high viscosity Newtonian liquids (with and without particles) were developed using stepwise multiple nonlinear regressions of statistically significant dimensionless groups using tangent as an estimate and Newton as search method. Data on overall heat transfer coefficient U and fluid-to-particle heat transfer coefficients h(fp) were obtained for several processing conditions and were analyzed separately for particle and particle-free conditions. In free axial mode, a newly developed form, combining natural and forced convection, Nu = A(1)(GrPr)A(2) + A(3)(Re)A(4)(Pr)A(5) (F(r))A(6)(rho(p)/rho(l))A(7)(e/100-e)A(8)(d(p)/D(c))A(9)(K(p)/K(l))A(10) provided higher R(2) = 0.93. In the absence of particles in end-over-end mode, introducing natural convection term (Gr x Pr), improved R(2) from 0.81 to 0.97. Combination of the reel radius, radius of the can and radius of the particles was chosen as characteristics length.
- 出版日期2010-2
