EBK NUMERICAL METHODS FOR ENGINEERS
7th Edition
ISBN: 8220100254147
Author: Chapra
Publisher: MCG
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Chapter 21, Problem 6P
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A group of 23 power transistors, dissipating 2 W each, are to be cooled by attaching them to a black-anodized square aluminum plate and mounting the plate on the wall of a room at 30°C. The emissivity of the transistor and the plate surfaces is 0.9. Assuming the heat transfer from the back side of the plate to be negligible and the temperature of the surrounding surfaces to be the same as the air temperature of the room, determine the length of the square plate if the average surface temperature of the plate is not to exceed 50°C. Start the iteration process with an initial guess of the size of the plate as 43 cm.
The properties of air at 1 atm and the film temperature of (Ts + T)/2 = (50 + 30)/2 = 40°C are k = 0.02662 W/m·°C, ν = 1.702 × 10–5 m2 /s, Pr = 0.7255, and β = 0.003195 K–1.
Multiple Choice
0.473 m
0.284 m
0.513 m
0.671 m
A 40-cm-diameter, 127-cm-high cylindrical hot water tank is located in the bathroom of a house maintained at 20°C. The surface
temperature of the tank is measured to be 44°C and its emissivity is 0.4. Taking the surrounding surface temperature to be also 20°C,
determine the rate of heat loss from all surfaces of the tank by natural convection and radiation.
The properties of air at 32°C are k=0.02603 W/m-K, v=1.627 x 10-5 m²/s, Pr = 0.7276, and ẞ = 0.003279 K-1
The rate of heat loss from all surfaces of the tank by natural convection is
The rate of heat loss from all surfaces of the tank by radiation is
W.
W.
A 2.5-m-long thin vertical plate is subjected to uniform heat flux on one side, while the other side is exposed to cool air at 5°C. The
plate surface has an emissivity of 0.73, and its midpoint temperature is 55°C. Determine the heat flux subjected on the plate surface.
Uniform
heat flux
-Plate, € = 0.73
Cool air
5°C
7
TSUIT
Given: The properties of water at Tf,c= 30°C.
k=0.02588 W/m.K,
v=1.608 x 10-5 m²/s
Pr = 0.7282
The heat flux subjected on the plate surface is
W/m²
Chapter 21 Solutions
EBK NUMERICAL METHODS FOR ENGINEERS
Ch. 21 - 21.1 Evaluate the following...Ch. 21 - 21.2 Evaluate the following...Ch. 21 - Evaluate the following integral: 24(1x4x3+2x5)dx...Ch. 21 - Integrate the following function analytically and...Ch. 21 - 21.5 Integrate the following function both...Ch. 21 - Integrate the following function both analytically...Ch. 21 - 21.7 Integrate the following function both...Ch. 21 - 21.8 Integrate the following function both...Ch. 21 - 21.9 Suppose that the upward force of air...Ch. 21 - 21.10 Evaluate the integral of the following...
Ch. 21 - Prob. 11PCh. 21 - 21.12 Determine the mean value of the...Ch. 21 - 21.13 The function can be used to generate the...Ch. 21 - Evaluate the following double integral:...Ch. 21 - Evaluate the following triple integral...Ch. 21 - Develop a user-friendly computer program for the...Ch. 21 - Develop a user-friendly computer program for the...Ch. 21 - Develop a user-friendly computer program for...Ch. 21 - The following data was collected for a...Ch. 21 - 21.20 The outflow concentration from a reactor is...Ch. 21 - 21.21 An 11-m beam is subjected to a load, and the...Ch. 21 - The work produced by a constant temperature,...Ch. 21 - Determine the distance traveled for the following...Ch. 21 - 21.24 The total mass of a variable density rod is...Ch. 21 - 21.25 A transportation engineering study requires...Ch. 21 - Determine the average value for the data in Fig....
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Need a deep-dive on the concept behind this application? Look no further. Learn more about this topic, mechanical-engineering and related others by exploring similar questions and additional content below.Similar questions
- Hot water is flowing at an average velocity of 5.82 ft/s through a cast iron pipe (k=30 Btu/h-ft-°F) whose inner and outer diameters are 1.0 in and 1.2 in, respectively. The pipe passes through a 50-ft-long section of a basement whose temperature is 60°F. The emissivity of the outer surface of the pipe is 0.5, and the walls of the basement are also at about 60°F. If the inlet temperature of the water is 150°F and the heat transfer coefficient on the inner surface of the pipe is 30 Btu/h-ft².°F, determine the temperature drop of water as it passes through the basement. Evaluate air properties at a film temperature of 105°C and 1 atm pressure. The properties of air at 1 atm and the film temperature of (Ts+ T∞)/2 = (150+60)/2 = 105°F are k=0.01541 Btu/h-ft-°F. v=0.1838 × 10-3 ft2/s, Pr = 0.7253, and ẞ = 0.00177R-1arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forward
- ! Required information Consider a flat-plate solar collector placed horizontally on the flat roof of a house. The collector is 1.3 m wide and 2.8 m long, and the average temperature of the exposed surface of the collector is 42°C. The properties of air at 1 atm and the film temperature are k=0.02551 W/m-°C, v = 1.562 × 10-5 m²/s, Pr = 0.7286, and ẞ= 0.003356 K-1 Determine the rate of heat loss from the collector by natural convection during a calm day when the ambient air temperature is 8°C. The rate of heat loss from the collector by natural convection is W.arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forwardhand-written solutions only, please. correct answers upvoted!arrow_forward
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