Chapter 5, Problem 5.11P

A 20  °C water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40  °C The water flows parallel to the 50cm side of the plate. If the kinematic viscosity of water is 78x10-8 m2/s, What is the local heat flux (Q/A) at the end of the plate (k=0.86 W/m deg C, Re=3840000, and Pr=0.7)?

Air ( density :1,2 kg /m3 viscosity : 1.5x10-5 m2 /s ) flows over a flat plate of length 2,5 m and width 1 m at a test speed of 1,5 m/s. Determine the approximate magnitude of frictional force, F . (Flat plate is totally submerged in air and both surfaces of it are of same surface quality )ANSWER: F = 0,017955 N

Consider Couette flow for two plates separated by a 6 inch-thick layer of 10W-30 oil. The top plate is pulled with a constant velocity of 3 m/s while the bottom plate is held stationary. What is the velocity of the fluid at a location 4 inches above the bottom plate?

FLUID DYNAMICS   Discuss the factors that influence pressure drop due to friction both for laminar flow and for turbulentflow in fluid flow in pipes.

Swamee's equation provides an approximate solution for virtually any usual relative roughness and Reynolds number values. Despite being an approximation that combines the equation for the laminar regime with the Colebrooke-White equation, it presents results that are more applicable than the latter for the critical region (2000 < Re < 4000). Choose an option:(  ) Real(  ) False

Explain and discuss the significance of (i) Rayleigh number and (ii) Nusselt number in natural convection

What is turbulent viscosity? What causes it?

An expression for the laminar velocity profile on a flat plate is u=C1sin(C2y)+C3 Where the argument of the sine function is in radians. Using the three common physicalconditions that the velocity profile should satisfy, determine  a) the constants C1, C2, and C3.b) the nondimensional velocity profilec) the boundary thickness (δ/x) as a function of lengthd) the skin friction coefficient, Cf as a function of lengthe) displacement thickness (δ*/x) as a function of lengthf) the momentum thickness (θ/x) as a function of lengthg) the drag force (FD) on both sides of the plate

A 6 cm diameter shaft rotates at 3000 rpm in a 20 cm long bearing with a uniform play of 0.2 mm. Under stable operating conditions, both the bearing and the shaft in the vicinity of the oil gap are at 50 ° C, and the viscosity and thermal conductivity of the lubricating oil are 0.05 Ns / m 2 and 0.17 W / mK. Simplifying and solving the equations for continuity, momentum, and energy, determine (a) the maximum oil temperature, (b) the rates of heat transfer to the bearing and shaft, and (c) the mechanical power wasted by viscous dissipation in Oil. Answers: (a) 53.3 ° C, (b) 419 W, (c) 838 W