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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.

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.

Elements Of Electromagnetics
Elements Of Electromagnetics
7th Edition
ISBN:9780190698614
Author:Sadiku, Matthew N. O.
Publisher:Sadiku, Matthew N. O.
ChapterMA: Math Assessment
Section: Chapter Questions
Problem 1.1MA
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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
Using the Nusselt numbers provided in the table, estimate the surface temperature of the fourth device. Report the temperature in °C. Nux=12.5mm =30.62 Nux = 12.5mm = [38.27 Nux=15.0mm =35.42 Nu, = 144.28 = 15.0mm Nux=17,5mm =40.07 Nuy = 17.5mm = 50.09
Transcribed Image Text:Using the Nusselt numbers provided in the table, estimate the surface temperature of the fourth device. Report the temperature in °C. Nux=12.5mm =30.62 Nux = 12.5mm = [38.27 Nux=15.0mm =35.42 Nu, = 144.28 = 15.0mm Nux=17,5mm =40.07 Nuy = 17.5mm = 50.09
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