In a circular piping, water flows with 2 m/s at 298 K and 1 atm. The...
In a circular piping, water flows with 2 m/s at 298 K and 1 atm. The piping has a diameter of 0.025 m. Determine the mass transfer coefficient and the Schmidt number of water in the air inside with a length of 3 m.
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In a circular piping, water flows with 2 m/s at 298 K and 1 atm.
The...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water i...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
1. Water flows over a cylinder perpendicular to its axis (in cross flow) at 3 m/s....
1. Water flows over a cylinder perpendicular to its axis (in cross flow) at 3 m/s. The water is at 300 K and the cylinder surface is at 350 K. The cylinder diameter is 50 mm. 1. Identify the characteristic length 2. The temperature at which properties must be evaluated 3. Calculate the Reynolds number 4. Identify the Nusselt correlations for this problem 5. Calculate the average convective heat transfer coefficient
Water (p=998kg/m^3, u=0.001Pa*s) flows from reservoir A to reservoir B through the piping system shown. Each...
Water (p=998kg/m^3,
u=0.001Pa*s) flows from reservoir A to reservoir B through the
piping system shown. Each elbow has a minor loss coefficient of
1.2. Each valve has a minor loss coefficient of 3.2. The entrance
and exit are both sharp edged. Determine the flow rate L/min. You
now need to modify the piping system to increase the flow rate to
100L/min by reducing the length of the 25mm pipe. What must new
length of the 25mm pipe be?
86. Water...
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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...
Gasoline enters a combustion chamber, at 1 atm, 298 K and a rate of 0.08 kg/min, where it burns s...
Gasoline enters a combustion chamber, at 1 atm, 298 K and a rate of 0.08 kg/min, where it burns steadily and completely, with 70% excess air that enters the chamber at 1 atm, 200 K. The exit temperature of the combustion products is 800 K. Use the IG mixture model for gases. Represent gasoline with liquid octane. a. Determine the mass flow rate, [kg of air/min], of air. b. Determine the rate of heat transfer, . c. What is the...
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5.37 Water at 300 K overflows the inside of a vertical open pipe of diameter 1 m and forms a smooth film of thickness 0.05 cm. Pure carbon dioxide, at a pressure of 1 atm, flows slowly through the inside of the pipe. If the pipe is 2.5 m long, and the water enters free of carbon dioxide, at what rate (mol/h) can carbon dioxide be removed from the system in the exiting water stream? The Henry's law constant for...
At 298 K, the Henry's law constant for oxygen is 0.00130 M/atm. Air is 21.0% oxygen....
At 298 K, the Henry's law constant for oxygen is 0.00130 M/atm. Air is 21.0% oxygen. At 298 K, what is the solubility of oxygen in water exposed to air at 0.892 atm? If atmospheric pressure suddenly changes from 1.00 atm to 0.892 atm at 298 K, how much oxygen will be released from 4.60 L of water in an unsealed container?
1. The critical temperature and pressure of water are 647.1 K and 217.7 atm. For a...
1. The critical temperature and pressure of water are 647.1 K and 217.7 atm. For a sample of steam just below its critical point, 600.0 K and 200.0 atm, a. Calculate the number density. b. Calculate the mean free path. Assume the diameter of a water molecule is 0.15 nm. c. Compare these results to those for air at 1 atm and 298 K. d. Calculate the average speed of water molecules under these conditions, e. Calculate the collision frequency...
4 Air (with density 6.08 k3 and viscosity coefficient 2.95 x 10 Pa.s) at an average pressure of 10 bar and a bulk temperature of 600 K flows through a 0.5 m long, 20 mm internal diameter circular tub...
4 Air (with density 6.08 k3 and viscosity coefficient 2.95 x 10 Pa.s) at an average pressure of 10 bar and a bulk temperature of 600 K flows through a 0.5 m long, 20 mm internal diameter circular tube at 3.0 m3 hr1. The heat flux from the tube wall is 10 kW m2. Calculate the heat transfer coefficient and the inside wall temperature of the tube. [Nu0.023 Re08 Pr04; Pr 0.69] [20 marks]
4 Air (with density 6.08 k3...
For heat transfer class convectuve heat transfer 320 K and i) it is immersed in still air at 300 K. 2 atm pressure...
For
heat transfer class
convectuve heat transfer 320 K and i) it is immersed in still air at 300 K. 2 atm pressure? (i) it is immersed in still water at 300 K? -0.5 m 4-71. A 100 liter covered tank full of water at 290 K is to be heated to 340 K by means of steam condensing inside a1 cm-O.D. copper tube coil having 10 turns of 0.5 m diameter. If the steam-side thermal resistance is negligible and...
6 Water is heated in a pipe by exchanging heat with a warmer fluid that flows outside the pipe. Inside diameter of the pipe is dn 0.045 m and outside diameter dour0.05 m. Mean velocity of the water in the pipe is um-0.31 m/s and the bulk temperature is 323 K (density 988 kg m-3; viscosity 0.00055 kg m' sı. Pr 3.56, thermal conductivity k 0.64 W m1 Kt). The material of the pipe has thermal conductivity k 0.61 W...
1. Water flows over a cylinder perpendicular to its axis (in cross flow) at 3 m/s. The water is at 300 K and the cylinder surface is at 350 K. The cylinder diameter is 50 mm. 1. Identify the characteristic length 2. The temperature at which properties must be evaluated 3. Calculate the Reynolds number 4. Identify the Nusselt correlations for this problem 5. Calculate the average convective heat transfer coefficient
Water (p=998kg/m^3,
u=0.001Pa*s) flows from reservoir A to reservoir B through the
piping system shown. Each elbow has a minor loss coefficient of
1.2. Each valve has a minor loss coefficient of 3.2. The entrance
and exit are both sharp edged. Determine the flow rate L/min. You
now need to modify the piping system to increase the flow rate to
100L/min by reducing the length of the 25mm pipe. What must new
length of the 25mm pipe be?
86. Water...
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...
5.37 Water at 300 K overflows the inside of a vertical open pipe of diameter 1 m and forms a smooth film of thickness 0.05 cm. Pure carbon dioxide, at a pressure of 1 atm, flows slowly through the inside of the pipe. If the pipe is 2.5 m long, and the water enters free of carbon dioxide, at what rate (mol/h) can carbon dioxide be removed from the system in the exiting water stream? The Henry's law constant for...
1. The critical temperature and pressure of water are 647.1 K and 217.7 atm. For a sample of steam just below its critical point, 600.0 K and 200.0 atm, a. Calculate the number density. b. Calculate the mean free path. Assume the diameter of a water molecule is 0.15 nm. c. Compare these results to those for air at 1 atm and 298 K. d. Calculate the average speed of water molecules under these conditions, e. Calculate the collision frequency...
4 Air (with density 6.08 k3 and viscosity coefficient 2.95 x 10 Pa.s) at an average pressure of 10 bar and a bulk temperature of 600 K flows through a 0.5 m long, 20 mm internal diameter circular tube at 3.0 m3 hr1. The heat flux from the tube wall is 10 kW m2. Calculate the heat transfer coefficient and the inside wall temperature of the tube. [Nu0.023 Re08 Pr04; Pr 0.69] [20 marks]
4 Air (with density 6.08 k3...
For
heat transfer class
convectuve heat transfer 320 K and i) it is immersed in still air at 300 K. 2 atm pressure? (i) it is immersed in still water at 300 K? -0.5 m 4-71. A 100 liter covered tank full of water at 290 K is to be heated to 340 K by means of steam condensing inside a1 cm-O.D. copper tube coil having 10 turns of 0.5 m diameter. If the steam-side thermal resistance is negligible and...
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