Calculate the convective heat transfer rate from a 40-cm diameter horizontal pipe whose surface is maintained at 95°C. This pipe is transporting hot water in a steam power plant. The temperature of air around the pipe is 25°C and the air is blowing across the pipe with a velocity of 0.2 mph. 1 mile = 1609 m.
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- Determine the rate of heat loss from the wall of a building resulting from a 16 km/h wind blowing parallel to its surface. The wall is 24 m long and 6 m high, its surface temperature is 27C, and the temperature of the ambient air is 4C.1.21 In an experimental set up in a laboratory, a long cylinder with a 5-cm diameter, and an electrical resistance heater inside its entire length is cooled with water flowing crosswise over the cylinder at and a velocity of 0.8 m/s. For these flow conditions, 20 kW/m of power is required to maintain a uniform temperature of at the surface of the cylinder. When water is not available, air at is used with a velocity of 10 m/s to maintain the same surface temperature. However, in this case, the cylinder surface heat dissipation rate is reduced to 400 W/m. Calculate the convection heat transfer coefficients for both water and air, and comment on the reason for the differences in the values.7.43 Liquid sodium is to be heated from 500 K to 600 K by passing it at a flow rate of 5.0 kg/s through a 5-cmID tube whose surface is maintained at 620 K. What length of tube is required?
- Air at 27 ⁰C and 1 atm flows over a flat plate at a velocity of 3m/s, assuming the plate is heated its entire length to a temperature of 70⁰C. Heat transferred in first 25 cm of the plate is?Determine the convection heat transfer coefficient (in W/m?.K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.Determine the convection heat transfer coefficient (in W/m²-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x105 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x105 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round vour answer to2 decimal nlaces
- Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516×10-5 0.7309 25°C 0.02551 1.562x105 0.7296Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 3 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 10°C and leaves at 20°C, i.e. air is heated. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places.Determine the convection heat transfer coefficient (in W/m2-K) for air flowing at a velocity of 8 m/s in a 10-cm diameter and 10-m long tube. Air enters the tube at 30°C and leaves at 20°C, i.e. air is cooled. Take the property of air at 1 atm and assume flow to be fully developed. For air at 1 atm: Temperature k, W/m-K v, m?/s Pr 15°C 0.02476 1.470x10-5 0.7323 20°C 0.02514 1.516x10-5 0.7309 25°C 0.02551 1.562x10-5 0.7296 Hint: When the fluid temperature changes, we use its properties at mean temperature, unless otherwise specified. Round your answer to 2 decimal places. Add vour answer
- Air at 300°C flows over a flat plate of dimensions 0.50m by 0.25m. If theconvection heat transfer coefficient is 250 W/m2K, determine the heat transferrate from air to one side of the plate when the plate is maintained at 40°C.(ans.8.125 KW)An electric resistance heater is embedded in a long cylinder ofdiameter 30mm. When water with a temperature of 25 C and velocityof 1m/s flows crosswise over the cylinder, the power per unit lengthrequired to maintain the surface at a uniform temperature of 90 C is28kW/m. When air, also at 25 C, but with a velocity of 10m/s isflowing, the power per unit length required to maintain the samesurface temperature is 400W/m. Calculate and compare the convectioncoefficients for the flows of water and air.Engine oil at 54oC54oC flows over the upper surface of a 5m5m long plate whose temperature is 20oC20oC with a velocity of 2m/s2m/s. What is the heat transfer rate per unit width of the plate?