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can be modeled as a cir one end of the duct pus ure of 105 kPa, temperat ere is a heating element C t the air to a temperatur

can be modeled as a cir one end of the duct pus ure of 105 kPa, temperat ere is a heating element C t the air to a temperatur

Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
Principles of Heat Transfer (Activate Learning with these NEW titles from Engineering!)
8th Edition
ISBN:9781305387102
Author:Kreith, Frank; Manglik, Raj M.
Publisher:Kreith, Frank; Manglik, Raj M.
Chapter6: Forced Convection Over Exterior Surfaces
Section: Chapter Questions
Problem 6.8P
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Problem 3 A hair dryer can be modeled as a circular duct of constant diameter equal to 30 mm in which a small fan on one end of the duct pushes ambient air inside the duct. Right after the fan the air has a pressure of 105 kPa, temperature of 20°C and a velocity of 8 m/s entering the duct. Inside the duct there is a heating element (a resistor dissipating heat) in the path of air flow that is used to heat the air to a temperature of 50°C with atmospheric pressure of 100 kPa at the exit of the hair dryer. Determine: The volumetric flow rate of air measured at the exit of the hair dryer, in m³/s. A. 7.1x10-4 m³/s B. 6.5x10-³ m³/s C. 0.93 m³/s D. 6.0x10-³ m³/s The mass flow rate of air leaving the hair dryer, in kg/s A. 7.1x10-4 kg/s B. 6.5x10³ kg/s C. 0.93 kg/s D. 7.1x10³ kg/s The velocity of the air at the exit, in m/s. A. 7.1x10 ³ m/s B. 10 m/s C. 9.3 m/s D. 6.0x10 ³ m/s The amount of heat rate taken by the air. A. 0.213 kW B. 213 kW C. 0.290 kW D. 290 kW
Transcribed Image Text:Problem 3 A hair dryer can be modeled as a circular duct of constant diameter equal to 30 mm in which a small fan on one end of the duct pushes ambient air inside the duct. Right after the fan the air has a pressure of 105 kPa, temperature of 20°C and a velocity of 8 m/s entering the duct. Inside the duct there is a heating element (a resistor dissipating heat) in the path of air flow that is used to heat the air to a temperature of 50°C with atmospheric pressure of 100 kPa at the exit of the hair dryer. Determine: The volumetric flow rate of air measured at the exit of the hair dryer, in m³/s. A. 7.1x10-4 m³/s B. 6.5x10-³ m³/s C. 0.93 m³/s D. 6.0x10-³ m³/s The mass flow rate of air leaving the hair dryer, in kg/s A. 7.1x10-4 kg/s B. 6.5x10³ kg/s C. 0.93 kg/s D. 7.1x10³ kg/s The velocity of the air at the exit, in m/s. A. 7.1x10 ³ m/s B. 10 m/s C. 9.3 m/s D. 6.0x10 ³ m/s The amount of heat rate taken by the air. A. 0.213 kW B. 213 kW C. 0.290 kW D. 290 kW
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