Question

Using the Gnielinski correlation, what would the heat transfer coefficient, h (watts per meter kelvin) be?

For water (density = 963 kg/m3, dynamic viscosity = 303x10^-6, Pr = 1.89, k = 0.66 w/mk) flowing in a smooth pipe of 20 mm diameter, and Reynolds number being 500000.

Answer #1

Water at 15°C enters a tube of 2 cm of diameter with flow rate
3953 kg/h. Assume the ratio L/D>10, and the wall temperature is
constant at 80-C. The outlet temperature is 50°C The properties of
water at the film temperature are density rho = p = 985 kg/m3,
specific heat Cp = 4180 J/kgk, conductivity k = 0.651 W/mK, dynamic
viscosity mu= u = 4.71 × 10- kg/ms, At the wall temperature of 80°C
we have dynamic viscosity muw=...

Data for carbon dioxide:
Molecular weight:44.0
Heat capacity of gas phase: 0.036+4.23
x10-5T (in kJ/moleoC, T is
in oC)
Viscosity Pr k
(W/m K)
180oC2.13 x10-5kg/(m
s) 0.721 0.029
130oC 1.93x10-5kg/(m
s) 0.738 0.025
80oC 1.72x10-5kg/(m
s) 0.755 0.020
Approximate density: 2.0 kg/m3
Data for water:
Molecular weight:18.0
Heat capacity for liquid water: 0.0754 kJ/mole
oC
Viscosity:
Viscosity Pr k
(W/m K)
180oC139 x10-6kg/(m
s) 0.94 0.665
130oC 278x10-6kg/(m
s) 1.72 0.682
80oC 472x10-6kg/(m
s) 3.00 0.658
Ideal gas constant:
0.08206 L atm/(mol K)
Carbon dioxide, with flow rate of 0.10 kg/s, is to be cooled
from 180 oC to 80...

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