the maximum surface temperature on the circuit board (°C)?
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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Question
![A circuit board is cooled by passing
cool helium gaş "C,= 5193 J/kg.C, v
=1.233×10 m /s, p= 0.1635 kg/m Pr
= 0.669, k = 0.1565 W/m.°C " through a
channel [0.46 cm x14 cm×20 cm ]
drilled into the board. Helium enters at
15°C and 6.8 m/s and leaves at
63.7 °C. The heat flux at the top surface
of the channel can be considered to be
uniform, and heat transfer through
other surfaces is negligible. Assume
fully developed flow for the whole
channel length and (if flow is NOT
Laminar use Dittus-Boelter
equation:Nu=0.023 Re Pr) What is
the maximum surface temperature on
the circuit board (°C)?
Electronic components,
T, °C
Не
15°C
L=20 cm
Channel](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fb8233b2b-6a1d-4da4-a7d1-d39c4073803e%2F31bc94b9-ee95-4a8c-a0aa-eb4fa8b04fbf%2Flrz0d3l_processed.jpeg&w=3840&q=75)
Transcribed Image Text:A circuit board is cooled by passing
cool helium gaş "C,= 5193 J/kg.C, v
=1.233×10 m /s, p= 0.1635 kg/m Pr
= 0.669, k = 0.1565 W/m.°C " through a
channel [0.46 cm x14 cm×20 cm ]
drilled into the board. Helium enters at
15°C and 6.8 m/s and leaves at
63.7 °C. The heat flux at the top surface
of the channel can be considered to be
uniform, and heat transfer through
other surfaces is negligible. Assume
fully developed flow for the whole
channel length and (if flow is NOT
Laminar use Dittus-Boelter
equation:Nu=0.023 Re Pr) What is
the maximum surface temperature on
the circuit board (°C)?
Electronic components,
T, °C
Не
15°C
L=20 cm
Channel
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