Air at atmospheric pressure and temperature of 25 oC flows at a speed of 10 m/s along a flat plate that is 4 m long and has a uniform surface temperature of 140 oC. If critical Reynolds number of 200,000: a) the local heat transfer kingdom at x = 2; 3; and 4 m from the front rim. b) the average heat transfer balance is 4 m long. c) the rate of heat transfer from the surface of the plate to the air if the width of the plate surface is 2 m.

Air at atmospheric pressure and temperature of 25 oC flows at a speed of 10 m/s along a flat plate that is 4 m long and has a uniform surface temperature of 140 oC. If critical Reynolds number of 200,000: a) the local heat transfer kingdom at x = 2; 3; and 4 m from the front rim. b) the average heat transfer balance is 4 m long. c) the rate of heat transfer from the surface of the plate to the air if the width of the plate surface is 2 m.

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)

8th Edition

ISBN:9781305387102

Author:Kreith, Frank; Manglik, Raj M.

Publisher:Kreith, Frank; Manglik, Raj M.

Chapter8: Natural Convection

Section: Chapter Questions

Problem 8.56P

See similar textbooks

Similar questions

7. Two parallel plates separated by 15.5 cm move with a relative velocity of 7 m/s. How much force per unit area is required to maintain the velocity difference if the fluid separating the plates is (a) water with µ = 1 cP (b) SAE 30 motor oil with µ = 200 cP and (c) honey with µ = 10,000 cP?
A spherical rain drop of diameter D falls at its terminal velocity V in air of density ρa and viscosity µa. The raindrop has a drag coefficient given by where FD is the drag force acting on the drop and Re is the Reynolds number based on the drop diameter. What is V when ρa = 1.2 kg/m3 , µa = 18 × 10−6 N.s/m2 , and the density of water ρw = 1000 kg/m3 ? The volume of a sphere is given by πD3/6. State all your assumptions.
A wind stress of 0.2 N m-2 blows over an initially stationary freshwater lake, 20 km long, and moves water downwind in the upper 10 m of the 20 m deep lake. (a) Estimate the difference in lake level between the ends of the lake in the direction of the wind one would expect when the wind force is balanced by the opposing pressure force in the upper 10 m (assuming no Coriolis influence in the dynamical balance) (b) The current driven in the lower 10 m by the pressure force which is balanced by the vertical frictional forces characterized by a coefficient of vertical turbulent eddy viscosity Az=0.02 m2 s -1 .
In the flow of air at 20°C and 1 atm past a flat plate inFig. , the wall shear is to be determined at position x bya floating element (a small area connected to a strain-gageforce measurement). At x = 2 m, the element indicates ashear stress of 2.1 Pa. Assuming turbulent flow from the leadingedge, estimate (a) the stream velocity U, (b) the boundarylayer thickness δ at the element, and (c) the boundary layervelocity u, in m/s, at 5 mm above the element.
A paramecium is an elongated unicellular organism with approximately 50 μmin diameters and 150 μmin lengths. It swims through water by whip-like movements of cilia, small hairs on the outside of its body. Because it moves "head first" through the water, drag is determined primarily by its diameter and only secondarily by its length, so it's reasonable to model the paramecium as a 70-μm diameter sphere. A paramecium uses 2.0 PW of locomotive power to propel itself through 20∘C water, where 1 pW = 1 picowatt = 10−12W. What is its swimming speed in μm/s? Express your answer in micrometers per second.
Example: A fan of diameter 0.7 m running 1500 rpm delivers 140 m3/min of air at 15C against 75 mm of water total pressure when the total effeciency is 86%. Determine the volume of air delivered, total pressure and power consumed, if (a) the air temperature is 50C. (b) the air temperature is 50C and the fan speed is 1700 rpm. (c) the same conditions as (b) but a 0.6 m diameter, geometrically similar fan is used.
Two endlessly long flat plates, separated by 3 inches in distance but with a thickness of 5 inches, each transport alcohol (5 m/s, 1 Pa·s, S.G. 0.89 (ref. water at 4 degrees Celsius) to a given location with a specific velocity. Prove that the Reynold's number of the following problem is a value approximately around 90-100.
1-The wind blows with velocity 0.4 m/s parallel to the both sides of a flat plate with rectangular area 10m×10 m. The plate temperature is T0=60◦C, and the temperature of the air free stream is 20◦C. Assume laminar flow and calculate: (a) maximum boundary layer thickness, (b) the total force experienced by the plate, (c) estimate the total heat transfer rate by laminar forced convection (d) Make a qualitative sketch of how the local heat flux qx and τx varies along the length L.
You are being tasked as a wind tunnel engineer to investigate the performance of newly designed high-speed wind tunnel in UPNM. An exhaust gas flows through a nozzle where the inlet area is 5,000 cm2.At this inlet, the gas has a velocity of 1,200 m/s, temperature of 1,500oC,and pressure of 6,000 kPa. Initial measurement revealed that the pressure at the exit of the wind tunnel is 100 kPa. Based on this information, analyze and investigate ; i. Mach number at inlet of the nozzle ii. The velocity of gas at exit iii. The area of the nozzle at exit Take specific heat ratio for the exhaust gas, ? to be 1.7 and the gas constant, R to be 205 J/kg.
A fluid (Prandtl number, Pr = 1) at 500 K flows over a flat plate of 1.5 m length, maintained at 300 K. The velocity of the fluid is 10 m/s. Assuming kinetic viscosity, v = 30 x 10-6 m²/s, the thermal boundary layer thickness (in mm) at 0.5 m from the leading edge is (up to three decimal)?
Solve part a. in Matlban with the following changes please: Flow Speed U_inf = 0.5 m/s Plate Surface Temperate Ts = 77 C Describe what each case represents in terms of the boundry layer
Topic: Heat transfer Completely solve and box the final answer. A 20degC water flows to 50cmx60cm flat plate with velocity of 6m/s . The flat plate surface temperature is maintained at 40deg 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=0.72 W/m deg C, Re=3840000, and Pr=0.7)?