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4. Figure 3 illustrates a steady-state incompressible laminar cold flow entering the horizontal channel between two infinite vertical parallel plates with a distance, 2L. The flow keeps the forced convection manner in hydrodynamically and thermally fully-developed conditions. The gravity effect for the internal flow can be negligible. Wall 1 is attached on the heaters and has the uniform heat flux, qi, while Wall 2 is heated by the convective flow with a uniform heat flux, q2. We have the heat flux 9.=2.522. Twi is the temperature at Wall 1 and Tw2 is the temperature at Wall 2. The flow has the constant heat capacity, Cp, and the viscosity, u. Please show the coordinate to solve the problem. Using the non-slip boundary conditions, express the velocity distribution between the two walls with the mean velocity. (6 marks) (b) Determine the skin friction coefficient for the internal flow from the steady-state Navier-Stokes equation. (5 marks) (c) The heat input from the heating wall can be assumed to change the internal energy of the fluid under the steady state condition, determine the Nussle number, Nu, with the derivation procedure. (14 marks) Warm convective flow to heat Wall 2 with a Wall 2 Tw2 L L 11 mean TWI Heat conduction from heaters to Wall I with a Wall 1