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Heat transfer
PROBLEMM #2 (75 pts.) TASKSTREAM espenment, a hot air stream is blown over a...
In an experiment, the temperature of a hot air sS stream is to be measured by...
In an experiment, the temperature of a hot air sS stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99 percent of the initial temperature difference must be within 5s. The properties of the thermocouple junction are k 35 W/m-K, T 8500 kg/m3, and cp 320 J/kg-K The hot air has a free stream velocity and temperature of 3 m/s and 140°C,...
The temperature T (K) of a steel ball in a hot stream of air can be modeled with the tollowing t ...
The temperature T (K) of a steel ball in a hot stream of air can be modeled with the tollowing t order ordinary differential equation of temperature T (K) with respect to time t (seconds) dT where p is the mass density (7854 kg/m3) c is the specific heat (434 J/(kg-K) Lc is the characteristic length (m) havg is the average convection heat transfer coefficient (25 W/(m2-K) Tin is the temperature of the surrounding fluid (75 K) The characteristic length...
value 12.50 points 1 out of 3 attempts Hot air at 85°C is blown over a...
value 12.50 points 1 out of 3 attempts Hot air at 85°C is blown over a 1.9-mx 3.9-m flat surface at 21°C. If the convection heat transfer coefficient is 51 W/㎡.oC, determine the rate of heat transfer from the air to the plate. kW
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in...
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is i...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
2) Hot air enters a heat exchanger at 350°C and exits at 153°C. The heat extracted...
2) Hot air enters a heat exchanger at 350°C and exits at 153°C. The heat extracted is used to boil 0.277 kg/s of 100°C water (from saturated liquid to saturated steam). The heat exchanger is a single-shell shell-and-tube heat exchanger with two tube passes. The overall heat transfer coefficient for the hot side is 240 W/(m2). Assume a constant specific heat for air of cp = 1.005 kJ/(kg°C). The pressure of the hot air and the boiling water is P...
Problem X3-5, Heat Transfer, Spring 2018 A single-pass, double-tube counterflow heat exchanger will be used to...
Problem X3-5, Heat Transfer, Spring 2018 A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.14 kg/s stream of water nowing in the 12-mm diameter inside tube. The water in the inside tube enters the heat exchanger at 25 C. The water will be heated with a 0.12 kg/s m of hot water flowing in the annulus between the inside and outside tube that enters the heat exchanger at 80°C. UP the hot and cold streams, and...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing...
The heat transfer coefficient for hydrogen flowing over a sphere is to be determined by observing the temperature–time history of a sphere fabricated from pure copper. The sphere, which is 20.0 mm in diameter, is at 70°C before it is inserted into the gas stream having a temperature of 27°C. A thermocouple on the outer surface of the sphere indicates 50°C 97 s after the sphere is inserted into the hydrogen. Find a) What is the value of the specific...
2) Hot air enters a heat exchanger at 350°C and exits at 155°C. The heat extracted...
2) Hot air enters a heat exchanger at 350°C and exits at 155°C. The heat extracted is used to boil 0.283 kg/s of 100°C water (from saturated liquid to saturated steam). The heat exchanger is a single-shell shell-and-tube heat exchanger with two tube passes. The overall heat transfer coefficient for the hot side is 240 W/(m²°C). Assume a constant specific heat for air of Cp = 1.005 kJ/(kg °C). The pressure of the hot air and the boiling water is...
In an experiment, the temperature of a hot air sS stream is to be measured by a thermocouple with a spherical junction. Due to the nature of this experiment, the response time of the thermocouple to register 99 percent of the initial temperature difference must be within 5s. The properties of the thermocouple junction are k 35 W/m-K, T 8500 kg/m3, and cp 320 J/kg-K The hot air has a free stream velocity and temperature of 3 m/s and 140°C,...
The temperature T (K) of a steel ball in a hot stream of air can be modeled with the tollowing t order ordinary differential equation of temperature T (K) with respect to time t (seconds) dT where p is the mass density (7854 kg/m3) c is the specific heat (434 J/(kg-K) Lc is the characteristic length (m) havg is the average convection heat transfer coefficient (25 W/(m2-K) Tin is the temperature of the surrounding fluid (75 K) The characteristic length...
value 12.50 points 1 out of 3 attempts Hot air at 85°C is blown over a 1.9-mx 3.9-m flat surface at 21°C. If the convection heat transfer coefficient is 51 W/㎡.oC, determine the rate of heat transfer from the air to the plate. kW
Waste heat of exhaust hot air from a manufacturing process may be recovered by passing water through a thin-walled tube of 1.00 cm diameter as shown. Assume the temperature of the hot air is 177℃ in cross flow with a velocity of 20 m/s over the tube. The inlet and outlet temperature of water are 20C and 60 C, rospectively, and the ilow rate is 0.2 k/s. Deiemine (a) the total heat transfer rate from air to water, (b) The...
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...
Problem 1 (35 pts) The gold sphere, which is 20 mm in diameter, is located at 75°C before it is inserted into water stream having a temperature of 25°C. A thermocouple on the outer surface of the sphere indicates 55°C, 100 sec after the sphere is inserted into the water. Assume the sphere behaves as an isothermal object. (Pure gold: k = 400 W/m K, ρ = 9000 kg/m3,G-400 J/kg K, Volume of sphere (V)--, Lc = (3) Determine total...
2) Hot air enters a heat exchanger at 350°C and exits at 153°C. The heat extracted is used to boil 0.277 kg/s of 100°C water (from saturated liquid to saturated steam). The heat exchanger is a single-shell shell-and-tube heat exchanger with two tube passes. The overall heat transfer coefficient for the hot side is 240 W/(m2). Assume a constant specific heat for air of cp = 1.005 kJ/(kg°C). The pressure of the hot air and the boiling water is P...
Problem X3-5, Heat Transfer, Spring 2018 A single-pass, double-tube counterflow heat exchanger will be used to heat a 0.14 kg/s stream of water nowing in the 12-mm diameter inside tube. The water in the inside tube enters the heat exchanger at 25 C. The water will be heated with a 0.12 kg/s m of hot water flowing in the annulus between the inside and outside tube that enters the heat exchanger at 80°C. UP the hot and cold streams, and...
2) Hot air enters a heat exchanger at 350°C and exits at 155°C. The heat extracted is used to boil 0.283 kg/s of 100°C water (from saturated liquid to saturated steam). The heat exchanger is a single-shell shell-and-tube heat exchanger with two tube passes. The overall heat transfer coefficient for the hot side is 240 W/(m²°C). Assume a constant specific heat for air of Cp = 1.005 kJ/(kg °C). The pressure of the hot air and the boiling water is...
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