Air at a temperature of 25°C is blown across a flat plate at a mean velocity of 10 m/s. If the plate surface temperature is 525°C, make calculations for the heat transferred per metre width from both sides of plate over distance of 30 cm from the leading edge. The local value of Nusselt number is given by: ja.17 Nu, =0.332| 9R ² ( Pr) Where T, and T, are the absolute temperature of the plate surface and the free stream of air respectively. The properties of air at the mean film temperature are : p = 0.615 kg/ m ; C, = 1.0465 kJ/ kg.K ; k = 0.046 W/ mk ; p = N.s/ m?

Air at a temperature of 25°C is blown across a flat plate at a mean velocity of 10 m/s. If the plate surface temperature is 525°C, make calculations for the heat transferred per metre width from both sides of plate over distance of 30 cm from the leading edge. The local value of Nusselt number is given by: ja.17 Nu, =0.332| 9R ² ( Pr) Where T, and T, are the absolute temperature of the plate surface and the free stream of air respectively. The properties of air at the mean film temperature are : p = 0.615 kg/ m ; C, = 1.0465 kJ/ kg.K ; k = 0.046 W/ mk ; p = N.s/ m?

Elements Of Electromagnetics

7th Edition

ISBN:9780190698614

Author:Sadiku, Matthew N. O.

Publisher:Sadiku, Matthew N. O.

ChapterMA: Math Assessment

Section: Chapter Questions

Problem 1.1MA

See similar textbooks

Similar questions

Air at 20 C is flowing over a flat plate ( 6m long and 1.5m wide). The plate is maintained at 140 C. Find the heat loss from the plate if the air is flowing parallel to 6m side with a velocity of 2 m/s. What is the percentage change in heat transfer if the air flow is parallel to 1.5m side. The properties of air are: p=1.06 kg/m v 2.548x10 m/s, k=0.0295 W/mK and Pr-0.7. Nu =0.664Res Pr1 for laminar flow Nu, = (0.037RE-871)Pr for turbulent flow
A stream of Air flows over the upper surface of a flat plate having a length of 10 m. Variation of temperatures measurements in the boundary layer is correlated by an expression of the form T = 785 + 50 exp (-712xy), where x and y are in meters and T in K. The thermal conductivity of air is evaluated at the arithmetic mean of the free stream and surface temperatures to be k = 0.03 W/m.K. If the air temperature is equal to 45 C and the temperature of the plate is equal to 105 C. Determine The average convection coefficient for the entire plate. Select one: O a. 89 W/m^2.K O b. 78 W/m^2.K O c. 66.2 W/m^2.K O d. 98.6 W/m^2.K
Air at a temperature of 25oC flows parallel over a flat plate with free-stream velocity of 2 m/s. The plate surface temperature is uniform at 86oC. Calculate: a) Thermal boundary layer thickness at x = 8 cm from leading edge; b) Local heat flux on x = 8 cm from leading edge; c) Total heat transfer rate in the area of plate L = 8 cm from the leading edge and width w = 10 cm.
Consider two cases involving parallel flow of dry air at V = 1.5 m/s, T=45°C, and atmospheric pressure over an isothermal plate at T = 20°C. In the first case, Rex, = 5 x 105, while in the second case the flow is tripped to a turbulent state at x = 0 m. At what x -location, in m, are the thermal boundary layer thicknesses of the two cases equal? What are the local heat fluxes, in W/m², at this location for the two cases? x = 9jam 9 turb II = i i m W/m² W/m²
The answer options have been included
I need correctly
I need it urgently thank you
Air at 295 K flows at 3 m/s over a flat plate at 390 K. The air properties are as follows: density =1.1 kg/m3, viscosity =18.1×10−6 Pa.s, specific heat capacity =1005 J/kgK, and thermal conductivity =0.024 W/mK. The velocity and temperature profiles are assumed to be linear, giving the local Nusselt number to be Nux = 0.289 Rex1/ 2Pr1/3. The flow will become turbulent at a Reynolds number of 5×105. Assume the width of the plate perpendicular to the air flow is 1 m. At what distance from the leading edge does the flow become turbulent? ________m What is the heat transfer at the point of transition? ___________W What is the total heat transfer along the length of the plate where the flow is laminar? __________W
A stream of Air flows over the upper surface of a flat plate having a length of 10 m. Variation of temperatures measurements in the boundary layer is correlated by an expression of the form T = 785 + 50 exp (-712xy), where x and y are in meters and T in K. The thermal conductivity of air is evaluated at the arithmetic mean of the free stream and surface temperatures to be k = 0.03 W/m.K. If the air temperature is equal to 45 C and the temperature of the plate is equal to 105 C. Determine The average convection coefficient for the entire plate. Select one: O a. 98.6 W/m^2.K O b. 78 W/m^2.K O c. 89 W/m^2.K d. 66.2 W/m^2.K
O. Air with free stream temperature of 10 C is flowing over a flat plate (1.5m long and Im wide). The air is flowing along 1.5m side of the plate. The plate is maintained at 90'C. Find the velocity of air required to have a rate of heat dissipation as 3.75 kW. Use the correlations: Nu =0.664Reos Pro33 for laminar flow Nu, = (0.037RE-871)Pr3 for turbulent flow Take the properties p = 1.0877 kg/m u=2.029×10 m/s, k=0.028 W/mK, C,-1.007KJ/kg.K and Pr-0.703
i need the answer quickly