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Problem 7.054 Air at 25°C flows over a 9-mm-diameter sphere with a velocity of 20 m/s,...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 30 m/s, while the...
Air at 25°C flows over a 10-mm-diameter sphere with a velocity of 30 m/s, while the surface of the sphere is maintained at 75°C. What is the rate of heat transfer from the sphere?
T,= 75 °C T= 25°C V = 10 m/s Air 3. (25 pts) Atmospheric air at...
T,= 75 °C T= 25°C V = 10 m/s Air 3. (25 pts) Atmospheric air at 25 °C flows across a long pipe at a uniform velocity of 10 m/s. The pipe has an external diameter of 120 mm and its surface temperature is maintained at 75 °C. Determine the rate of heat transfer per unit length of the pipe and the drag force exerted per unit length of the pipe. Hint: You can use the information on the next...
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...
heat and mass transfer (20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average conv...
heat and mass transfer
(20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average convective heat transfer coefficient. (b) If the battery's internal heat generation is 5W and its thermal conductivity is 0.6 w/m-k, the determine the battery surface temperature and the maximum temperature in battery
(20 points) Air at 25°C cools a 2170 cylindrical battery...
A circular pipe of 25-mm outside diameter and 500-mm length is placed in an airstream at...
A circular pipe of 25-mm outside diameter and 500-mm length is placed in an airstream at 25°C and 1-atm pressure. The air moves in cross flow over the pipe at 15 m/s, while the outer surface of the pipe is maintained at 100 °C, what is the rate of heat transfer from the pipe? submit you answer in W.
8) Air flows over a flat plate at a velocity of 20 m/s and a temperature...
8) Air flows over a flat plate at a velocity of 20 m/s and a temperature of 20C. The surface temperature of the plate is 134C, and the length of the plate in the direction of flow is 1.5 m. Properties of air may be taken as A-0.030 W/m-C, Pr-0.700, and a/p 2.092E-5 m/s (5% ) What is the location from the leading edge, X, where the flow becomes turbulent Re (20)15 a l Ve30s T20 T LaLS 523 m...
QUESTION 3 Air at atmospheric pressure flows with an inlet velocity of 1 m/s across a...
QUESTION 3 Air at atmospheric pressure flows with an inlet velocity of 1 m/s across a bank of tubes 10 rows deep in the direction of flow. The tubes have an outside diameter of 10 mm and are arranged in a staggered manner with a longitudinal pitch of Si-15 mm and a transverse pitch of ST- 15 mm. The surface temperature of the tubes is maintained at 77°C by hot water flowing in the tubes. Determine the mean heat transfer...
Problem 1: Air at 20°C and 1 atm flows over a spherical object at 1 m/s....
Problem 1: Air at 20°C and 1 atm flows over a spherical object at 1 m/s. The sphere has a diameter of 10mm and its initial temperature is 134°C. If the density, specific heat, and conductivity of the sphere are 7832 kg/m , 549 J/kg.K, and 49.2 W/m.K, respectively, calculate the temperature at the center of the sphere after 100 seconds. Problem 3: Consider the sphere that was described in problem 1. If we place that hot sphere in a...
A 25-mm-diameter hot surface at is cooled by an air jet exiting a 5-mm-diameter round nozzle wi...
A 25-mm-diameter hot surface at
is cooled by an air jet exiting a 5-mm-diameter round nozzle with
a velocity of 35 m/s and temperature of 25. The
nozzle exit is 25 mm from the hot surface. Determine the percentage
change in average heat transfer coefficient at the hot surface if
the air is replaced with carbon dioxide or helium. Use material
properties from reputable tables.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable...
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.
T,= 75 °C T= 25°C V = 10 m/s Air 3. (25 pts) Atmospheric air at 25 °C flows across a long pipe at a uniform velocity of 10 m/s. The pipe has an external diameter of 120 mm and its surface temperature is maintained at 75 °C. Determine the rate of heat transfer per unit length of the pipe and the drag force exerted per unit length of the pipe. Hint: You can use the information on the next...
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...
heat and mass transfer
(20 points) Air at 25°C cools a 2170 cylindrical battery (with a diameter of 21 mm and a length of 70 mm) with a cross flow velocity of 6 m/s. a) Determine the average convective heat transfer coefficient. (b) If the battery's internal heat generation is 5W and its thermal conductivity is 0.6 w/m-k, the determine the battery surface temperature and the maximum temperature in battery
(20 points) Air at 25°C cools a 2170 cylindrical battery...
A circular pipe of 25-mm outside diameter and 500-mm length is placed in an airstream at 25°C and 1-atm pressure. The air moves in cross flow over the pipe at 15 m/s, while the outer surface of the pipe is maintained at 100 °C, what is the rate of heat transfer from the pipe? submit you answer in W.
8) Air flows over a flat plate at a velocity of 20 m/s and a temperature of 20C. The surface temperature of the plate is 134C, and the length of the plate in the direction of flow is 1.5 m. Properties of air may be taken as A-0.030 W/m-C, Pr-0.700, and a/p 2.092E-5 m/s (5% ) What is the location from the leading edge, X, where the flow becomes turbulent Re (20)15 a l Ve30s T20 T LaLS 523 m...
QUESTION 3 Air at atmospheric pressure flows with an inlet velocity of 1 m/s across a bank of tubes 10 rows deep in the direction of flow. The tubes have an outside diameter of 10 mm and are arranged in a staggered manner with a longitudinal pitch of Si-15 mm and a transverse pitch of ST- 15 mm. The surface temperature of the tubes is maintained at 77°C by hot water flowing in the tubes. Determine the mean heat transfer...
A 25-mm-diameter hot surface at
is cooled by an air jet exiting a 5-mm-diameter round nozzle with
a velocity of 35 m/s and temperature of 25. The
nozzle exit is 25 mm from the hot surface. Determine the percentage
change in average heat transfer coefficient at the hot surface if
the air is replaced with carbon dioxide or helium. Use material
properties from reputable tables.
We were unable to transcribe this imageWe were unable to transcribe this imageWe were unable...
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.
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