An engineer proposes to insert a solid rod of diameter D i into a circular tube of diameter D o to enhance heat transfer from the flowing fluid of temperature T m , to the outer tube wall of temperature T s , o Assuming laminar flow, calculate the ratio of the heat flux from the fluid to the outer tube wall with the rod to the heat flux without the rod, q o n / q o , w o n , for D i / D o = 0 , 0.10 , 0.25 and 0.50. The rod is placed concentrically within the tube.
An engineer proposes to insert a solid rod of diameter D i into a circular tube of diameter D o to enhance heat transfer from the flowing fluid of temperature T m , to the outer tube wall of temperature T s , o Assuming laminar flow, calculate the ratio of the heat flux from the fluid to the outer tube wall with the rod to the heat flux without the rod, q o n / q o , w o n , for D i / D o = 0 , 0.10 , 0.25 and 0.50. The rod is placed concentrically within the tube.
Solution Summary: The author compares the ratio of heat flux from fluid to the outer tube wall with the rod and the coefficient of convection heat transfer.
An engineer proposes to insert a solid rod of diameter
D
i
into a circular tube of diameter
D
o
to enhance heat transfer from the flowing fluid of temperature
T
m
, to the outer tube wall of temperature
T
s
,
o
Assuming laminar flow, calculate the ratio of the heat flux from the fluid to the outer tube wall with the rod to the heat flux without the rod,
q
o
n
/
q
o
,
w
o
n
, for
D
i
/
D
o
=
0
,
0.10
,
0.25
and 0.50. The rod is placed concentrically within the tube.
consider a flow of water in a cylinder maintained at constant temperature of hundred degree Celsius the diameter of the cylinder is 15 and the length of the tube is 6 metre the inlet and outlet temperature of the water is TI equal to 15 degree Celsius and equal 57 degrees celsius find the average heat transfer Coefficient associated with the flow of water mass flow rate is 2.25 kilogram per second and cp=4.178KJ/aKg.K
A shell-and-tube heat exchanger is used to cool compressed liquid methanol
from 176 °F to 104 °F. The methanol flows on the shell side of the
exchanger. The coolant is water that rises in temperature from 50 °F to
86 °F and flows within the tubes at a rate of 68.9 kg s1. Finding the
appropriate thermophysical data and applying the proper equations, you are
required to do the following:
(a)
Calculate i) methanol mass flow rate in the exchanger, ii) methanol
volumetric flowrate at the inlet of the exchanger.
(b) i) For the counter-current flow of the fluids calculate the log
temperature difference, ii) explain the purpose of calculating this
difference, iii) explain, quantitatively, why is the counter-current flow in
heat exchangers preferred to co-current flow.
mean
Consider the shell and tube heat exchanger where liquid A of density pa is flowing through the inner tube and is being heated from temperature Tat to Taz by liquid B of density pe flowing counter-currently around the tube The temperature of liquid B decreases from Ten to Tea. In many practical situations the tubular heat exchanger is modelled using simple ordinary differential equations. This is possible if we think about the heat exchanger within the unit as being an exchanger between two perfect mixed tanks. Each one of them contains a liquid.
i Investigate the nature of a system a heat exchanger under ideal conditions
ii. Develop appropriate equations to model the heat exchange i State the assumption and their implications
iv. Perform a degree of freedom analysis.
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