Prediction of batch heat transfer coefficients for pseudoplastic fluids ...

96
vThere N is in rev./sec ..
and S is measured in po1..mds.
The heat equivalent, qlvI' of this pOvJer input can be calculated
by multiplying by the proper conversion factor ..
1.286 x 10- 3 Btu = 1 ft. Ib ..
60 sec .. "" 1 min.
Therefore
:: 1.286 x 10-3 P (60)
!'!: 7.72 x 10- 2 P (4-5
Hhere qr1 is measured in Btu/min. and the pOHer is expressed
in ft. Ibs./sec.
The rate of heat transfer into the batch of fluid,
Ql-2' is measured by the fluid's gain in heat content per
unit time.
ql-2 :: HOp dTjdt (4-6
ql-2 is expressed in Btu/min. if
\1 is the 'vJeight of the batch measured in pounds
T
t
is the batch temperature in of
is time in minutes
The net heat transfer rate in the heating cycle is
(L~-7
In the cooling cycle the mech~Ylical
heat as "'Jell as the
sensible heat must be transfered th.-rough the Hall and