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

momentum" mass" and energy may be ~'Iritten.
the z direction the equation of motion is (21)
( (J Y ~ + 'VA. J V
z + V g J Vz -+ V z ) V
z L _ d?
)1; )A. A, Je Jz )- cJz
(
~ J (.-2 1A.z) -+.-! J l"sz + J Izz. L.,L ~ q z
-..-i. .J A.. --i. d- e j z j -J
For flow in
(3-1
For the model being considered in the region near the wall:
1. The flmv is as slLrned to be cons tan t 1-li th
time, therefore j ;z ~ tJ
2. The velocity gradients in the 8 and z
directions are assumed to be zero.
3. The velocity in the 8 direction is assumed
to be zero.
?t.
For a power 1m·] fluid r::: K;; .
Therefore,
1.4z = _Kr.:!!k -f- ~ 7 ~ - K [d h. J~ (3-2
L)/t.. dz..l "d4
2. Tzz ~ - ;:(}:) ~ 0 U-3
3· I;z"-;;'lj1 +1 jf1: 0 (H
The equation of motion for this model is thus
The continuity equation is (21)
/
-r - h-
-f
I
(3-5
For the model vJi th negligible velocity gradients in the z