## Theses

Spring 5-31-1956

Thesis

#### Degree Name

Master of Science in Chemical Engineering - (M.S.)

#### Department

Chemical Engineering

Jerome J. Salamone

C. L. Mantell

Joseph Joffe

#### Abstract

Curtis and Gullett (7) developed an equation correlating the effect of velocity, concentration and particle size on apparent viscosity of non-Newtonian water slurries.

μ/μw=1.02(AK/GC).105

The object of this paper was to determine the validity of using the viscosity, as determined by the Curtis-GulLett (7) equation, in predicting the heat transfer coefficient of non-Newtonian fluids, where the suspending medium is something other than pure water . The authors used various concentrations of sugar solutions as the dispersion medium, for the slurries.

A dimensionless equation resembling the flittusBoelter equation with modified exponents and additional dimensionless groups has been developed by J.J. Salamone (14):

HD/Kf=.131(DVbPb/ μb).62(Cs/Cf).35(Cfμb/Kf).72(D/Ds).05(Ks/Kf).05

Franks and Rinaldi (8) found the magnitude of the exponents to be as follows:

HD/Kf=.0138(DVbPb/ μb).8(Cs/Cf).42(Cfμb/Kf).79(D/Ds).106(Ks/Kf).05

Experimentally determined heat transfer coefficients deviated from the values calculated by the Franks and Rinaldi (8) equation by 16%.

This is what was expected, since the Curtis and Gullett (7) equation is accurate to 14.4%, the authors of this paper feel this equation may be used to obtain the viscosity of a slurry in predicting the magnitude of the heat transfer coefficient.

The authors feel that a sufficient amount of experimental data has been obtained in determining the validity of the Franks and Rinaldi(8) equation for predicting heat transfer coefficients of' non-newtonian fluids, but additional work of a statistical nature is recommended in re-evaluating the exponents of the Franks and Rinaldi(S) equation. in the light of all available data. Closer agreement between experimental and calculated values for heat transfer coefficients would result.

COinS
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