Solution
= Solution
The relative coefficient change is $t/\alpha$, so for $t\ll\alpha$ the flow is approximately steady and its <streamlines> are $\alpha y^2/2-x=C$.
= Solution
The relative coefficient change is $t/\alpha$, so for $t\ll\alpha$ the flow is approximately steady and its <streamlines> are $\alpha y^2/2-x=C$.