You have been asked to perform a feasibility study on the design of a blood warmer to be used during the transfusion of blood to a patient. This exchanger is to heat blood taken from the bank at 1 0 ° C to 37 ° C at a flow rate of 200 ml/min . The blood passes through a rectangular cross-section tube, 6.4 mm × 1 .6 mm , which is sandwiched between two plates held at a constant temperature of 40 ° C . (a) Compute the length of the tubing required to achieve the desired outlet conditions at the specified flow rate. Assume the flow is fully developed and the blood has the same properties as water. (b) Assess your assumptions and indicate whether your analysis over- or underestimates the necessary length.
You have been asked to perform a feasibility study on the design of a blood warmer to be used during the transfusion of blood to a patient. This exchanger is to heat blood taken from the bank at 1 0 ° C to 37 ° C at a flow rate of 200 ml/min . The blood passes through a rectangular cross-section tube, 6.4 mm × 1 .6 mm , which is sandwiched between two plates held at a constant temperature of 40 ° C . (a) Compute the length of the tubing required to achieve the desired outlet conditions at the specified flow rate. Assume the flow is fully developed and the blood has the same properties as water. (b) Assess your assumptions and indicate whether your analysis over- or underestimates the necessary length.
Solution Summary: The length of the tubing required to achieve the desired outlet conditions at the specified flow rate is L=1.890m
You have been asked to perform a feasibility study on the design of a blood warmer to be used during the transfusion of blood to a patient. This exchanger is to heat blood taken from the bank at
1
0
°
C
to
37
°
C
at a flow rate of
200
ml/min
. The blood passes through a rectangular cross-section tube,
6.4
mm
×
1
.6
mm
, which is sandwiched between two plates held at a constant temperature of
40
°
C
.
(a) Compute the length of the tubing required to achieve the desired outlet conditions at the specified flow rate. Assume the flow is fully developed and the blood has the same properties as water.
(b) Assess your assumptions and indicate whether your analysis over- or underestimates the necessary length.
For Heat transfer through cylinder tube wall, the
temperature is to be a linear function of r (radius) of
the tube.
Select one:
O True
O False
The conductivity of H20 in solid form (ice) is higher
than that of H20 in liquid form (water).
Select one:
O True
O False
F, (Correction factor for temperature in some heat
exchangers) should be 1.0 or greater than 1.0 in
some cases.
Select one:
O True
False
The thermal conductivity of aluminum is higher than
that of concrete material (one of most popular
building materials).
Select one:
O True
O False
An example of convective heat transfer is freezing of
the ground during the winter.
Select one:
O True
O False
Fouling on heat exchanger tubes has no effect on
heat exchanger's performances.
Select one:
O True
O False
For good winter jackets, they should be made of
light-weight materials, filled with air, that have very
low conductivity.
Select one:
O True
O False
Due higher viscosity, the heat-transfer coefficient of
moving liquid hydrocarbons is generally higher than
that of moving water
Select one:
O True
O False
The proper strategy to enhance heat transfer of a
heat exchanger is trying to increase the heat transfer
coefficient of the side with the lower heat resistant.
Select one:
O True
O False
For the universal 3-D heat transfer equation (see
topic 7 in URCourses notes), we have to simplify by
eliminating terms that are zero or near zero first, and
then we can only use numerical methods (such as
finite difference) to solve those problems.
Select one:
O True
O False
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