A numerical solution of the thermal entry length problem for circular pipes with constant temperature boundaries and with a prescribed dependence of viscosity on temperature and viscous dissipation of some specified order are presented. The results indicate a significant effect of these factors. The results for both heating and cooling processes are presented and compared with the available analytical results. They are useful in the design of heat exchangers with high Prandtl number fluids as the working media. © 1978 Springer-Verlag.

V. M.K. Sastri

HEAT EXCHANGERS - DESIGN

Heat transfer

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IIT Madras

Numerical solution of thermal entry length problem with variable viscosities and viscous dissipation

Wärme- und Stoffübertragung

The effect of time-dependent pressure pulsations on heat transfer in a pipe flow with constant temperature boundaries is analysed numerically when the viscosity of the pulsating fluid is an inverse linear function of the temperature. The coupled differential equations are solved using Crank-Nicholson semi-implicit finite difference formulation with some modifications. The results indicate local variations in heat transfer due to pulsations. They are useful in the design of heat exchangers working under pulsating flow conditions. The analytical results are presented for both heating and cooling. The conditions under which pulsating flows can augment the heat transfer are discussed. The results are applicable for heat exchangers with fluids of high Prandtl number. © 1989 Springer-Verlag.

Journal	Data powered by TypesetWärme- und Stoffübertragung
Publisher	Data powered by TypesetSpringer-Verlag
ISSN	00429929
Open Access	No