Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470501979
Author: Frank P. Incropera, David P. DeWitt, Theodore L. Bergman, Adrienne S. Lavine
Publisher: Wiley, John & Sons, Incorporated
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Textbook Question
Chapter 1, Problem 1.16P
A square silicon chip
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A chip that is of length L = 5.5 mm on a side and thickness t = 2.0 mm is encased in a ceramic substrate, and its exposed surface is
convectively cooled by a dielectric liquid for which h = 150 W/m² K and To
= 20°C.
.
Th
Chip,
q, T₁, P, Cp
The time is
Substrate
In the off-mode the chip is in thermal equilibrium with the coolant (T; = T). When the chip is energized, however, its temperature
increases until a new steady state is established. For purposes of analysis, the energized chip is characterized by uniform volumetric
heating with a = 9 x 106 W/m³. Assuming an infinite contact resistance between the chip and substrate and negligible conduction
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The steady-state chip temperature Tf is i
S.
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The temperature of the outer surface of a vertical tube through which hot water is flowing is 275 K. The temperature of the external environment where the tube is located is 232K. The outer diameter of the tube is 30 mm and the length is 150 mm. Its work simply disappears from the side surfaces of the cylinder.a. Calculate the loss, ignoring the radiation losses.b. Calculate the loss from the pipe with the increase of natural convection(s=0.55 for steel tube)
Chapter 1 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 1 - The thermal conductivity of a sheet of rigid,...Ch. 1 - The heat flux that is applied to the left face of...Ch. 1 - A concrete wall, which has a surface area of 20m2...Ch. 1 - The concrete slab of a basement is 11 in long. 8...Ch. 1 - Consider Figure 1.3. The heat flux in the...Ch. 1 - The heal flux through a wood slab 50 mm thick,...Ch. 1 - The inner and outer surface temperatures of a...Ch. 1 - A thermodynamic analysis of a proposed Brayton...Ch. 1 - A glass window of width W=1m and height H=2m is 5...Ch. 1 - A freezer compartment consists of a cubical cavity...
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