Introduction to Chemical Engineering Thermodynamics
Introduction to Chemical Engineering Thermodynamics
8th Edition
ISBN: 9781259696527
Author: J.M. Smith Termodinamica en ingenieria quimica, Hendrick C Van Ness, Michael Abbott, Mark Swihart
Publisher: McGraw-Hill Education
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Problem 3. A liquid is flowing through an 8cm diameter pipe. It is being heated by a hot fluid
flowing outside of the pipe. Local velocities of the liquid stream were obtained at different radial
positions by pitot tube inserted into the pipe and they are tabulated below with the local
temperature values:
r (cm)
0
v (m/s)
0.63
T (°C) 16
3.5 3.75
0.62
0.5 1.0 1.5 2.0 2.5 3.0
0.60 0.57 0.52 0.45 0.35
17 18 19 20 22 26 35
0.22
0.11
47
4.0
0
75
a) Calculate the Reynolds number by estimating the volumetric flow rate of the liquid.
b) Calculate the Nusselt number by using the appropriate correlation.
c)
Estimate the local heat transfer coefficient.
d) Calculate the bulk temperature at that location.
e) Suggest another way to find the heat transfer coefficient. Which of the heat transfer
coefficients would you rely on most?
Average liquid properties: p= 700 kg/m³, µ = 0.0018 kg/(m.s), k = 0.6 W/(m.K),
CP=300 J/kg.
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Transcribed Image Text:Problem 3. A liquid is flowing through an 8cm diameter pipe. It is being heated by a hot fluid flowing outside of the pipe. Local velocities of the liquid stream were obtained at different radial positions by pitot tube inserted into the pipe and they are tabulated below with the local temperature values: r (cm) 0 v (m/s) 0.63 T (°C) 16 3.5 3.75 0.62 0.5 1.0 1.5 2.0 2.5 3.0 0.60 0.57 0.52 0.45 0.35 17 18 19 20 22 26 35 0.22 0.11 47 4.0 0 75 a) Calculate the Reynolds number by estimating the volumetric flow rate of the liquid. b) Calculate the Nusselt number by using the appropriate correlation. c) Estimate the local heat transfer coefficient. d) Calculate the bulk temperature at that location. e) Suggest another way to find the heat transfer coefficient. Which of the heat transfer coefficients would you rely on most? Average liquid properties: p= 700 kg/m³, µ = 0.0018 kg/(m.s), k = 0.6 W/(m.K), CP=300 J/kg.
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