7.34 Consider the following fluids, each with a velocity of V- 3 m/s and a temperature of T 20°C, in cross flow over a 10-mm-diameter cylinder maintained at 50°C: atmospheric air, saturated water, and engine oil. (a) Calculate the rate of heat transfer per unit length, q, using the Churchill-Bernstein correlation. (b) Generate a plot ofq as a function of fluid velocity for o.5 s Vs 10 m/s. 7.34 Consider the following fluids, each with a velocity of V- 3...
7.10 Consider atmospheric air at 25°C and a velocity of 25 m/s flowing over both surfaces of a 1-m-long flat plate that is maintained at 125°C. Determine the rate of heat transfer per unit width from the plate for values of the critical Reynolds number corresponding to 105 5 X 105, and 106.
A circular pipe, with an outside diameter of 30 mm and a wall thickness of 4 mm, is held stationary in a stream of air for which T-30°C, F-1 atm , and V-25 m/s . The pipe, which is made of PVC, experiences cross-flow conditions in the moving air 1) The temperature at the inner surface of the pipe is maintained at 90°C. The outer surface of the pipe is smooth. Also, assume that steady-state conditions exist. Since the outer...
QUESTION 3 Air at atmospheric pressure flows with an inlet velocity of 1 m/s across a bank of tubes 10 rows deep in the direction of flow. The tubes have an outside diameter of 10 mm and are arranged in a staggered manner with a longitudinal pitch of Si-15 mm and a transverse pitch of ST- 15 mm. The surface temperature of the tubes is maintained at 77°C by hot water flowing in the tubes. Determine the mean heat transfer...
Problem 1: Atmospheric air at 25°C flows over both surfaces of 2 m long flat plate maintained at 125°C. For upper surface, velocity of air is 1 m/s and for lower surface, velocity is 10 m/s. (Rex,c = 5x105) (a) Determine the flow condition for upper and lower surfaces. (Laminar, or turbulent). If the condition is that laminar to turbulent is taking place, calculate the position where transition from the laminar to turbulent happens. (b) Determine the rate of heat...
Consider atmospheric air at 20°C and a velocity of 30 m/s flowing over both surfaces of a 1-m-long flat plate that is maintained at 130°C. Determine the rate of heat transfer per unit width from the plate for values of the critical Reynolds number corresponding to 105, 5 × 105, and 106
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 30 m/s, while the surface of the sphere is maintained at 75°C. What is the rate of heat transfer from the sphere?
Forced air at T = 25°C and V = 13 m/s is used to cool electronic elements on a circuit board. One such element is a chip, 4 mm x4 mm, located 120 mm from the leading edge of the board. Experiments have revealed that flow over the board is disturbed by the elements and that convection heat transfer is correlated by an expression of the form Nuz = 0.04 Re0.85 Pp1/3 V.T. 3 V,T 1 = 4 mm Chip...
2) (35 pt) Atmospheric air at 25 Centers a duct having a cross section of an equilateral triangle 2 cm on a side with a velocity of 1.5 m/s. The length of the duct is 10 m. A constant heat flux is imposed on the duct wall. The mean temperature of the air at the duct exit is 75 °C. a. Is the flow at the duct exit hydrodynamically and thermally fully developed? Show. T-75 °C b. Calculate the convection...
Problem 7.054 Air at 25°C flows over a 9-mm-diameter sphere with a velocity of 20 m/s, while the surface of the sphere is maintained at 75°C. What is the rate of heat transfer from the sphere? tPatheaticalsnctions