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

I {)D
The generalized Reynolds n~mber, NR~' is expressed as
N t D a 2 -r\T (.)
Re:: 1, I
(2-22
a::A
Jia
where Da is the agitator diameter expressed in feet.
N
is the rotational speed of the impeller expressed
in rev./sec.
P is the fluid density expressed in Ibsom/ft.3.
jUa is the apparent viscosity expressed in Ibsf/seco ft.
as calculated by equation 2-25a.
A more theoretical Reynolds number can be calculated
using the apparent viscosity, #d:, defined by equation 1.~-19.
In this case
(4-20
Generalized Prandtl Number
The generalized Pr8..c'1.dtl number, N pl !.' is
(4-21
Hhere C p is the heat capacity of the fluid.
k
is the thermal conductivity of the fluid.
1>Jhere C p
is expressed in Btu .. /l"bm°F •
fia is expressed in Ibf/ft .. sec ..
k is expressed in Btu/ft 2 OF sec./ft.