Two immiscible incompressible fluids are flowing between two horizontal
flat plates of length L, width W and vertical separation 2δ. The flow rates
are adjusted such that the thickness of each layer is δ. The fluid in the
lower layer is more dense and more viscous than the fluid in the upper layer.
Calculate,
a)      the variation of υx with y in both layers of fluid,
b)      the variation of τxy with y in both layers.

The value of ΔP/L is the same in both layers.

我想請問的是boundary condition有哪些？
我能確定的只有在fluid跟flat plates的作用處，速度會是０

我感到疑惑的地方是，兩個液體的介面有什麼樣的關係。

對於shear stress，我的想法試上面那層容易給下面那層溶液的應該要等於下面那
層給上面那層的大小，但是要掛負號。

而對於速度的話，我認為速度在這邊應該要是連續的，因為要達到穩定的狀態。

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