1. To a good approximation, the dynamic viscosity µ,, the top surface for g = 1 mm, D= 150 rad/s? What is the total electric power requirement? What can you say thermal conductivity k, and the specific heat cp are inde about the nature of the flow between the disks?
2. Consider airflow over a flat plate of length L = 1m under conditions for which transition occurs atxc = 0.5 m based on the critical Reynolds number, Rex,c = 5 X 105.
(a) Evaluating the thermophysical properties of air at 350 K, determine the air velocity.
(b) In the laminar and turbulent regions, the local con- vection coefficients are, respectively, hlam(x) = Clam x-0.5 and hturb = Cturb x-0.2 pendent of pressure. In what manner do the kinematic viscosity v and thermal diffusivity a vary with pressure for an incompressible liquid and an ideal gas? Deter- mine a of air at 350 K for pressures of 1, 5, and 10 atm. Assuming a transition Reynolds number of 5 X 105, determine the distance from the leading edge of a flat plate at which transition will occur for air at 350 K at pressures of 1, 5, and 10 atm with uoo = 2 m/s.