Example 2: Suppose that an external pressure-drop along x-direction is applied across the channel, in addition to the conditions mentioned in example 1. Now, calculate the velocity profiles in the channel.
X-momentum balance is now modified to
Y–momentum balance:
But is a function of y only. This implies that (constant)
is a function of y only. This implies that 
(constant)
(Same as in example 1)
, where, 
