Water is contained between two infinite parallel plates separated by a small distance h. The bottom plate is stationary and the top is moved at a constant velocity U so that a simple, parallel shear flow is generated. A dilute plug of solute wi th a diffusivity D is placed in the channel. Neglecting the effects of diffusion in the x - direction, find the effective dispersion coefficient for this problem

Liquid flows at steady state at a rate of 2 lb/'s through a pump, which operates to raise the elevation of the liquid 100 ft from control volume inlet to exit. the liquid specific enthalpy at the inlet is 40.09 btu/lb and at the exit is 40.94 btub. the pump requires 3 btu/s of power to operate. if kinetic energy effects are negligible and gravitational acceleration is 32.174 tt/s, the heat transfer rate associated with this steady state process is most closely 1)-2,02 btu/s from the liquid to the surroundings 2)-3.98 btu/s from the surroundings to the liquid. 3)-4.96 btu/s from the surroundings to the liquid. 4)-1.04 btu/s from the liquid to the surroundings.