Correlation of Curtis and Gullett equation for viscosity of non-Newtonian suspensions and Franks and Rinaldi equation for heat transfer coefficients

Author

Irene S. Wisla, Newark College of Engineering
John L. Kukowski, Newark College of Engineering

Document Type

Thesis

Date of Award

Spring 5-31-1956

Degree Name

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

Department

Chemical Engineering

First Advisor

Jerome J. Salamone

Second Advisor

C. L. Mantell

Third Advisor

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/μ_w=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/K_f=^.131(DV_bP_b/ μ_b)^.62(C_s/C_f)^.35(C_fμ_b/K_f)^.72(D/D_s)^.05(K_s/K_f)^.05

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

HD/K_f=^.0138(DV_bP_b/ μ_b)^.8(C_s/C_f)^.42(C_fμ_b/K_f)^.79(D/D_s)^.106(K_s/K_f)^.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.

Recommended Citation

Wisla, Irene S. and Kukowski, John L., "Correlation of Curtis and Gullett equation for viscosity of non-Newtonian suspensions and Franks and Rinaldi equation for heat transfer coefficients" (1956). Theses. 1527.
https://digitalcommons.njit.edu/theses/1527