Between two very long and very wide conveyor belts, which are horizontal and parallel, there is a fluid (Newtonian) with density and viscosity . The distance between the two conveyor belts is 2B, while the length and width of the conveyor belts are L and W, respectively (L and W >>> 2B). At first the fluid and conveyor belt are at rest, then the upper conveyor belt moves to the right with a constant speed of V, while the lower conveyor belt moves to the left at a constant speed of 2V, as a result, the fluid will be dragged by the two conveyor belts. By using the equation of motion table and ignoring end effects, get an equation that expresses the velocity profile of a liquid fluid in a steady state.

V 2B 2V