Estimate the value of the mass-transfer coefficient in a stream of air at 325.6 K flowing in a duct by the following sh...
Estimate the value of the mass-transfer coefficient in a stream of air at 325.6 K flowing in a duct by the following shapes made of solid naphtalene. The velocity of the air is 1.524 m/s at 325.6 K and 202.6 kPa. The DAB of naphtalene in air is 5.16x10-6 m2/s at 273 K and 101.3 kPa.
a) For air flowing parallel to a flat plate 0.152 m in legth
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Estimate the value of the mass-transfer coefficient in a stream of air at 325.6 K flowing in a duct by the following sh...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
A thin, flat plate of 0.6 m square is immersed in a parallel stream of air at atmospheric pressure and 15 ºC flowing at a velocity of 6 m/s. Neglect edge effects. a) Determine the drag force exerted o...
A thin, flat plate of 0.6 m square is immersed in a parallel stream of air at atmospheric pressure and 15 ºC flowing at a velocity of 6 m/s. Neglect edge effects. a) Determine the drag force exerted on the plate. b) Determine the boundary layer thickness and the local drag coefficient at a distance 0.3 m from the leading edge.
Heat Transfer Please be neat and organized for a thumbs up! Problem 3 Atmospheric air at...
Heat Transfer
Please be neat and organized for a thumbs up!
Problem 3 Atmospheric air at T 300 K and a free stream velocity of u 10 m/s flows over a flat plate L = 2 m long that is maintained at a uniform temperature T-320 K. (a) Calculate the average heat transfer coefficient over the region where the boundary layer is laminar. What is the boundary layer thickness at this location? plate as well as the velocity boundary layer...
Air at 32oC is humidified by flowing over a 1.2 m long container filled with water....
Air at 32oC is humidified by flowing over a 1.2 m long container filled with water. The interfacial temperature is 20°C. The initial temperature of the air is 25% and its velocity is 0.1 5 m/s. 1. Calculate the average mass transfer coefficient for water in the air in m/s. 2. Calculate the molar concentration of water in the air at the water-air interface in mol H20/m3 Calculate the molar concentration of water in the air far from the interface...
Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity...
Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x), in °C, and the local convection coefficient, hx(x ), in W/m2.K. at x = 0.2 m. (b) Calculate the...
A) Determine the convection heat transfer coefficient for the flow of air. [W/m2·°C] B) Determine the...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
7.9-1 7.9-1. Mass Transfer and Turbulence Models. Pure water at a velocity of 0.11 m/s is flowing at 261°C past...
7.9-1
7.9-1. Mass Transfer and Turbulence Models. Pure water at a velocity of 0.11 m/s is flowing at 261°C past a flat plate of solid benzoic acid where L = 0.40 m. Do as follows: (a) Assuming dilute solutions, calculate the mass-transfer coefficient k. Use physical-property data from Example 7.3-2. (b) Using the film model, calculate the equivalent film thickness. (c) Using the penetration model, calculate the time of penetration. (d) Calculate the mean surface renewal factor using the modified...
Heat transfer 1 Normal 1 No Spac.. Heading 1 Heading2 Title Subt Paragraph Styles Heat Transfer...
Heat transfer
1 Normal 1 No Spac.. Heading 1 Heading2 Title Subt Paragraph Styles Heat Transfer - Assignment 1 An ideal gas is heated from 50 C to 80 C, (a) at constant volume and (b) at constant pressure. For which case do you think the energy required will be greater? Why? 1. 2. Consider a house with a floor space of 200 m2 and an average height of 3 m at sea level essure is 101.3 kPa. Initially the...
Solve asap 3. During an experiment involving the flow of dry air at 30°C and 1...
Solve asap
3. During an experiment involving the flow of dry air at 30°C and 1 atm (101.325 kPa) at a free stream velocity of 5 m/s over a body covered with a layer of naphthalene. The incoming air is free of naphthalene, and thus the mass fraction of naphthalene in the free stream is zero (WAC). The vapor pressure of naphthalene at 30°C is 18.5 Pa and the diffusion coefficient of naphthalene in air at 30°C is 0.86 x...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case is the rate of heat transfer higher? How does the convection heat transfer coefficient differ from the thermal conductivity of a fluid? (ii) Explain the physical significance of Nusselt number (ii) By definition, discuss hydraulic diameter. Obtain an expression for hydraulic diameter of a circular tube of diameter, D (b) The local atmospheric pressure in Gboko, Benue State Nigeria (elevation 1610 m), is 834...
Cold conditioned air at 10°C is flowing inside a 1.5 cm thick square aluminum (k = 240 w/mK) duct of inner cross section of 25x25cm at a mass flow rate of 1.0 kg/s. The duct is exposed to air at 35°C with a combined convection-radiation heat transfer coefficient of 15 W/m2K. The convection heat transfer coefficient at the inner surface is 75 W/.m2.K. If the air temperature in the duct should not increase by more than 1°C determine the maximum...
Heat Transfer
Please be neat and organized for a thumbs up!
Problem 3 Atmospheric air at T 300 K and a free stream velocity of u 10 m/s flows over a flat plate L = 2 m long that is maintained at a uniform temperature T-320 K. (a) Calculate the average heat transfer coefficient over the region where the boundary layer is laminar. What is the boundary layer thickness at this location? plate as well as the velocity boundary layer...
Air at 32oC is humidified by flowing over a 1.2 m long container filled with water. The interfacial temperature is 20°C. The initial temperature of the air is 25% and its velocity is 0.1 5 m/s. 1. Calculate the average mass transfer coefficient for water in the air in m/s. 2. Calculate the molar concentration of water in the air at the water-air interface in mol H20/m3 Calculate the molar concentration of water in the air far from the interface...
Air at atmospheric pressure and a temperature of 25°C is in parallel flow at a velocity of 5 m/s over a 1-m-long flat plate that is heated from below with a uniform heat flux of 1250 W/m2. Assume the flow is fully turbulent over the length of the plate. Evaluate properties at 325 K. (a) Calculate the plate surface temperature, Ts(x), in °C, and the local convection coefficient, hx(x ), in W/m2.K. at x = 0.2 m. (b) Calculate the...
A) Determine the convection
heat transfer coefficient for the flow of air.
[W/m2·°C]
B) Determine the convection heat transfer coefficient for water.
[W/m2·°C]
The velocity of the fluid is 9 m/s in an 8-cm diameter and 7-m-long tube when the tube is subjected to uniform heat flux from all surfaces. Use fluid properties at 25°C. Water or Air D 8 cm L=7 m Given: The properties of air at 25°C are: k 0.02551 W/m."C v 1.562 10-5 m2/s Pr =...
7.9-1
7.9-1. Mass Transfer and Turbulence Models. Pure water at a velocity of 0.11 m/s is flowing at 261°C past a flat plate of solid benzoic acid where L = 0.40 m. Do as follows: (a) Assuming dilute solutions, calculate the mass-transfer coefficient k. Use physical-property data from Example 7.3-2. (b) Using the film model, calculate the equivalent film thickness. (c) Using the penetration model, calculate the time of penetration. (d) Calculate the mean surface renewal factor using the modified...
Heat transfer
1 Normal 1 No Spac.. Heading 1 Heading2 Title Subt Paragraph Styles Heat Transfer - Assignment 1 An ideal gas is heated from 50 C to 80 C, (a) at constant volume and (b) at constant pressure. For which case do you think the energy required will be greater? Why? 1. 2. Consider a house with a floor space of 200 m2 and an average height of 3 m at sea level essure is 101.3 kPa. Initially the...
Solve asap
3. During an experiment involving the flow of dry air at 30°C and 1 atm (101.325 kPa) at a free stream velocity of 5 m/s over a body covered with a layer of naphthalene. The incoming air is free of naphthalene, and thus the mass fraction of naphthalene in the free stream is zero (WAC). The vapor pressure of naphthalene at 30°C is 18.5 Pa and the diffusion coefficient of naphthalene in air at 30°C is 0.86 x...
(a) (iWhen is heat transfer through a fluid by conduction or by convection? For what case is the rate of heat transfer higher? How does the convection heat transfer coefficient differ from the thermal conductivity of a fluid? (ii) Explain the physical significance of Nusselt number (ii) By definition, discuss hydraulic diameter. Obtain an expression for hydraulic diameter of a circular tube of diameter, D (b) The local atmospheric pressure in Gboko, Benue State Nigeria (elevation 1610 m), is 834...
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