Fundamentals of Heat and Mass Transfer
7th Edition
ISBN: 9780470917855
Author: Bergman, Theodore L./
Publisher: John Wiley & Sons Inc
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Chapter 10, Problem 10.34P
(a)
To determine
The boiling regime for operation of chip after power dissipation return to its designed value.
(b)
To determine
The reduction in clock speed relative to design value to return to nucleate boiling regime.
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1. Water at atmospheric pressure is to be boiled in polished copper pan. The diameter of the pan is 300
mm and is kept at 111°C. Calculate the following :
() Power of the burner to maintain boiling;
(i) Rate of evaporation in kg/h.
Take the properties of water at 100°C as follows:
P, = 958 kg/m"; p, = 0.597 kg/m²; µ,= 278 × 10ʻ kg/ms; c= 4216 JkgK;
= 2257 kJ/kg ; Pr= 1.723, o = 58.9 x 10-³ N/m
%3D
[Ans. (1) 13.664 kW, (i) 21.8 kg/h]
Explain the cooling effect of evaporation in terms of latent heat of vaporization.
*** 32. A double-chambered container contains one mole of helium in one of its 1000 cm³
Pull to
volume chambers. The container is well-insulated, and of low specific heat, so that no appre-
remove
ciable heat is added to the gas during the process we describe. The gas is initially at a tempera-
ture of 300 K and a pressure of 1 atmosphere. The partition between the two chambers is then
quickly raised, and the gas expands freely to fill the entire container. Whenever a monatomic
gas like helium doubles its volume adiabatically like this, the pressure in the gas will drop to
0.315 of what it was before (for reasons that we did not explain in this chapter), so the final
1000 cm3
1000 cm³
pressure of the expanded gas will be 0.315 atmospheres.
a) What is the temperature of the gas after the expansion?
b) What is the change in the internal energy of the gas?
c) How much heat is added to the gas? [Hint: Maybe read the problem again.]
d) How much work is done by the gas as it expands? [Hint:…
Chapter 10 Solutions
Fundamentals of Heat and Mass Transfer
Ch. 10 - Show that, for water at 1-atm pressure with...Ch. 10 - The surface of a horizontal. 7-mm-diameter...Ch. 10 - The role of surface tension in bubble formation...Ch. 10 - Estimate the heat transfer coefficient, h,...Ch. 10 - Prob. 10.5PCh. 10 - Prob. 10.6PCh. 10 - Prob. 10.7PCh. 10 - Prob. 10.8PCh. 10 - Calculate the critical heat flux on a large...Ch. 10 - Prob. 10.11P
Ch. 10 - Prob. 10.12PCh. 10 - Prob. 10.13PCh. 10 - Prob. 10.15PCh. 10 - Prob. 10.16PCh. 10 - Consider a gas-fired boiler in which five coiled,...Ch. 10 - Prob. 10.18PCh. 10 - Prob. 10.19PCh. 10 - Prob. 10.20PCh. 10 - Prob. 10.22PCh. 10 - Prob. 10.24PCh. 10 - Prob. 10.25PCh. 10 - A small copper sphere, initially at a uniform,...Ch. 10 - Prob. 10.28PCh. 10 - A disk-shaped turbine rotor is heat-treated by...Ch. 10 - A steel bar, 20 mm in diameter and 200 mm long,...Ch. 10 - Electrical current passes through a horizontal....Ch. 10 - Consider a horizontal. D=1 -mm-diameter platinum...Ch. 10 - Prob. 10.34PCh. 10 - Prob. 10.35PCh. 10 - Prob. 10.36PCh. 10 - Prob. 10.37PCh. 10 - A polished copper sphere of 10-mm diameter,...Ch. 10 - Prob. 10.39PCh. 10 - Prob. 10.40PCh. 10 - Consider refrigerant R-134a flowing in a smooth,...Ch. 10 - Determine the tube diameter associated with p=1...Ch. 10 - Saturated steam at 0.1 bar condenses with a...Ch. 10 - Prob. 10.45PCh. 10 - Prob. 10.46PCh. 10 - Prob. 10.47PCh. 10 - Prob. 10.48PCh. 10 - Prob. 10.50PCh. 10 - Prob. 10.53PCh. 10 - The condenser of a steam power plant consists of...Ch. 10 - Prob. 10.56PCh. 10 - Prob. 10.61PCh. 10 - Prob. 10.62PCh. 10 - A technique for cooling a multichip module...Ch. 10 - Determine the rate of condensation on a 100-mm...Ch. 10 - Prob. 10.66PCh. 10 - Prob. 10.67PCh. 10 - Prob. 10.70PCh. 10 - Prob. 10.71PCh. 10 - Prob. 10.74PCh. 10 - Prob. 10.75PCh. 10 - A thin-walled cylindrical container of diameter D...
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