Consider atmospheric air at 20°C and a velocity of 30 m/s flowing over both surfaces of...
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
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Consider atmospheric air at 20°C and a velocity of 30 m/s
flowing over both surfaces of...
7.10 Consider atmospheric air at 25°C and a velocity of 25 m/s flowing over both surfaces...
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.
Problem 1: Atmospheric air at 25°C flows over both surfaces of 2 m long flat plate...
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...
RCES Problem 7.002 Engine oil at 100°C and a velocity of 0.20 m/s flows over both...
RCES Problem 7.002 Engine oil at 100°C and a velocity of 0.20 m/s flows over both surfaces of a 1-m-long flat plate maintained at 20°C 001 Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. 02 Determine the velocity boundary layer thickness 6 at the trailing edge, in m....
4) Air at 101 kPa and 360 K flows at 15 m/s over a flat plate...
4) Air at 101 kPa and 360 K flows at 15 m/s over a flat plate maintained at 300 K Assume that the transition Reynolds number is 5x10 (0.332R 12Pr1/3 Re < 5 x 105 0.029Repr0:43 5 x 105 < Re <3 x 107 Assume that k-0.03 W/( mK), 20x10* m?ls, Pr-0.7.p=1.16 kg/m a) If the plate is 2 m long, sketch the local heat transfer coefficient over the plate. Specify the functional form of h with respect tox b)...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
Problem 7.019 Steel (AISI 1010) plates of thickness δ 18 mm and length L-1 m on...
Problem 7.019 Steel (AISI 1010) plates of thickness δ 18 mm and length L-1 m on a side are conveyed from a heat treatment process and are concurrently cooled by atmospheric air of velocity u. 5 m/s and T.20°C in parallel flow over the plates. Conveyor For an initial plate temperature of Ti =300°C, what is the rate of heat transfer from the plate? what is the corresponding rate of change of the plate temperature? The velocity of the air...
Air at atmospheric pressure and temperature of 565 C flows with velocity of 0915 m/sec along...
Air at atmospheric pressure and temperature of 565 C flows with velocity of 0915 m/sec along a flat plate which is kept at a uniform temperature of 121.1 C. Determine the local heat transfer coefficient hk) at a distance of 0,61 meter from the leading edge of the plate and the total heat transfer coefficient hm over the length of x 0 to x= 0.61m peer feet of plate width. Air at average temperature has Pr 0.62, k-0.0313 W/m. C...
Unused engine oil at 27°C flows with a free stream velocity of 0.1 m/s over a...
Unused engine oil at 27°C flows with a free stream velocity of 0.1 m/s over a 20 cm square plate. The plate temperature is maintained at 67°С. Consider the following: ii) iii) Determine the Reynolds number based on plate length Rel. Calculate the average Nusselt number based on plate length Nuu. Evaluate the heat transfer (W) from the plate.
7.34 Consider the following fluids, each with a velocity of V- 3 m/s and a temperature of T 20°C,...
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...
1. A very smooth flat plate of length L-1 m and width b 3 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids [5 marks] Show that the flow is completely...
1. A very smooth flat plate of length L-1 m and width b 3 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids [5 marks] Show that the flow is completely laminar over the entire plate. a. b. Determine the drag force on one side of the plate. Determine the thicknesses δ, δ*, and θ at the end of the plate (x L). [6 marks] C. For air use,...
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.
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...
RCES Problem 7.002 Engine oil at 100°C and a velocity of 0.20 m/s flows over both surfaces of a 1-m-long flat plate maintained at 20°C 001 Determine: (a) The velocity and thermal boundary layer thicknesses at the trailing edge. (b) The local heat flux and surface shear stress at the trailing edge. (c) The total drag force and heat transfer per unit width of the plate. 02 Determine the velocity boundary layer thickness 6 at the trailing edge, in m....
4) Air at 101 kPa and 360 K flows at 15 m/s over a flat plate maintained at 300 K Assume that the transition Reynolds number is 5x10 (0.332R 12Pr1/3 Re < 5 x 105 0.029Repr0:43 5 x 105 < Re <3 x 107 Assume that k-0.03 W/( mK), 20x10* m?ls, Pr-0.7.p=1.16 kg/m a) If the plate is 2 m long, sketch the local heat transfer coefficient over the plate. Specify the functional form of h with respect tox b)...
Exercise 2 Air at 20 °C and 1 atm flows over a flat plate at 50 m/s. The plate is 300 cm long and is maintained at 60C. The width of the plate is 2 m. The critical Rec = 5 x 105 The properties are Conductivity k = 0.0263 W/mK, kinematic viscosity nu = v = 15.89 x 10-6 m²/s, Prandtl number is Pr=0.707 Density rho = p = 1.128 kg/m3 1. Determine the critical length Xc 2. Determine...
Problem 7.019 Steel (AISI 1010) plates of thickness δ 18 mm and length L-1 m on a side are conveyed from a heat treatment process and are concurrently cooled by atmospheric air of velocity u. 5 m/s and T.20°C in parallel flow over the plates. Conveyor For an initial plate temperature of Ti =300°C, what is the rate of heat transfer from the plate? what is the corresponding rate of change of the plate temperature? The velocity of the air...
Air at atmospheric pressure and temperature of 565 C flows with velocity of 0915 m/sec along a flat plate which is kept at a uniform temperature of 121.1 C. Determine the local heat transfer coefficient hk) at a distance of 0,61 meter from the leading edge of the plate and the total heat transfer coefficient hm over the length of x 0 to x= 0.61m peer feet of plate width. Air at average temperature has Pr 0.62, k-0.0313 W/m. C...
Unused engine oil at 27°C flows with a free stream velocity of 0.1 m/s over a 20 cm square plate. The plate temperature is maintained at 67°С. Consider the following: ii) iii) Determine the Reynolds number based on plate length Rel. Calculate the average Nusselt number based on plate length Nuu. Evaluate the heat transfer (W) from the plate.
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...
1. A very smooth flat plate of length L-1 m and width b 3 m is immersed parallel to a stream of velocity 2 m/s. For both air and water as the working fluids [5 marks] Show that the flow is completely laminar over the entire plate. a. b. Determine the drag force on one side of the plate. Determine the thicknesses δ, δ*, and θ at the end of the plate (x L). [6 marks] C. For air use,...
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