Abstract:
Heat transfer characteristics for the heating of the dilute,
solutions of different types of Cellofas in straight tubes are
studied ,numerically in laminar condition with constant wall
temperature considering viscous dissipation. The scope of this
study is limited to numerical prediction of velocity profile,
temperature profile and the rate of heat transfer at steady fully
developed condition.
"TEACH-T", a general computer program has been used for this
purpose. After sufficient testing against bench-mark experimental
and analytical data, the computer program was used for the
prediction of flow and heat transfer data.
The present study is confined to a tube of fixed diameter 17.4
mm. Power law model describes the flow behaviour of the fluids
and the fluid consistency, K is temperature dependent. To study
the effect of heating on velocity profile, temperature profile
and the rate of heat transfer, three different temperature ratio
T./T., namely, 1.068, 1.13 and 1.233 were considered.
Present study indicates that velocity profile becomes flatter
with the increase of pseudoplasticity and temperature ratio, The •
effect of pseudopastici ty on temperature profi Ie is small but the
effect of temperature ratio is significant. Effect of
pseudoplasticity and viscous dissipation on heat transfer rates
are interrelated. This combined effect is small because the
fluids considered do not have large values for consistency, K.
