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 10.56P
To determine
The expression for time
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Use the Kedzierski (2003) refrigerant/lubricant mixture pool boiling model to predict the boiling
heat transfer coefficient (hm) for a range of superheats (4T, = 8 K to 40 K) and Ts = 277.6 K:
5.9×107(1−x,)ph ATk, (1-e*)
x, To
Where
1₂
%₁ =
=
9m
T-T
Г
x Τσ
PL-Pbx 5.9×107(1-x₂)ph AT
0.755lp₁ (1-x₁) _ 18.75õ₁ (1—x₁) _ 18.75×10¯¹º[m]p, (1-x₂)
Xp Prv
XpPrv
XpPrv
Assume that λ = 1.34 for xb=0.005 and that λ = 0.3 for Xb = 0.02.
The properties of the refrigerant (R123) at the film temperature are:
KL
(W/mK)
0.139
R123
Or
(N/m)
179692.3 0.01764
hfg
(J/kg)
The properties of the mineral oil (lubricant) are:
PL
(kg/m³)
917.8
York-C
VL
(cSt)
60
Prv
(kg/m³)
2.701
VL
(m²/s)
6 × 10-5
OL
(N/m)
0.026
1.) Plot hm vs ATs and le vs ATs for two lubricant mass fractions: x = 0.005 (use 2 = 1.34 for
Xb = = 0.005) and x = 0.02 (use λ = 0.3 for xb = 0.02). Compare the predicted ro for the
two mass fraction cases. Provide a plausible reason for why the boiling heat transfer
coefficient for a given AT's for…
AH of vaporization of water is 439.2 cal/g at the normal boing point. Since virus can survive at 404.39 K by forming
spores. Most virus spores die at 851.9 K. Hence, autoclaves used to sterilize medical and laboratory instruments are
pressurized to raise the boiling point of water to 851.9 K. Find out at what InP (torr) does water boil at 851.9 K?
O a. 8460.435
O b. 940.048
c. 1880.097
O d. 2.474
need soon all parts
don't copy I will downvote
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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