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1. Find or calculate the thermal conductivity of air at T = 52°C and atmospheric pressure. Report the property value in W/m-K. 2. Find or calculate the kinematic viscosity of air at T = 52°C and atmospheric pressure.  Report the property value in m2/s. 3. Find or calculate the Prandtl number of air at T = 52°C and atmospheric pressure

1. Find or calculate the thermal conductivity of air at T = 52°C and atmospheric pressure. Report the property value in W/m-K. 2. Find or calculate the kinematic viscosity of air at T = 52°C and atmospheric pressure.  Report the property value in m2/s. 3. Find or calculate the Prandtl number of air at T = 52°C and atmospheric pressure

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.
Chapter5: Analysis Of Convection Heat Transfer
Section: Chapter Questions
Problem 5.42P
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1. Find or calculate the thermal conductivity of air at T = 52°C and atmospheric pressure. Report the property value in W/m-K.

2. Find or calculate the kinematic viscosity of air at T = 52°C and atmospheric pressure.  Report the property value in m2/s.

3. Find or calculate the Prandtl number of air at T = 52°C and atmospheric pressure.

The next 8 questions are all related to the following problem statement and figure. Air at 27°C with a free stream velocity of u» = 10 m/s is used to cool electronic devices mounted on a printed circuit board (PCB). Each device dissipates 40 mW (rate of conversion of electrical energy into thermal energy), is thin, and can be modeled as isothermal with a square top that is 5 mm by 5 mm. Due to the low thermal conductivity of the PCB, all of the dissipated energy can be assumed to be transferred out of the devices from their tops. A turbulence promoter (turbulator) is located at the leading edge of the board, causing the boundary layer to be turbulent over the entire length of the PCB. Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board. Use properties of air at T= 52°C and atmospheric pressure. Air Turbulator Fourth device X = 15 mm Printed circuit board Itt
Transcribed Image Text:The next 8 questions are all related to the following problem statement and figure. Air at 27°C with a free stream velocity of u» = 10 m/s is used to cool electronic devices mounted on a printed circuit board (PCB). Each device dissipates 40 mW (rate of conversion of electrical energy into thermal energy), is thin, and can be modeled as isothermal with a square top that is 5 mm by 5 mm. Due to the low thermal conductivity of the PCB, all of the dissipated energy can be assumed to be transferred out of the devices from their tops. A turbulence promoter (turbulator) is located at the leading edge of the board, causing the boundary layer to be turbulent over the entire length of the PCB. Estimate the surface temperature of the fourth device located 15 mm from the leading edge of the board. Use properties of air at T= 52°C and atmospheric pressure. Air Turbulator Fourth device X = 15 mm Printed circuit board Itt
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