This document summarizes a CFD analysis of a double pipe heat exchanger. It describes the geometry of the heat exchanger with an inner copper tube and outer aluminum tube. It also discusses the meshing and boundary conditions used in the CFD model. The results show that counter-current flow has a more uniform temperature distribution and higher heat transfer rate compared to parallel flow. The conclusion is that counter-current flow is more effective for heat transfer in a double pipe heat exchanger.

1. CFD ANALYSIS OF DOUBLE
PIPE HEAT
EXCHANGER
S.EZHIL RAJ
M.E –THERMAL( R & AC)
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2. CONTENT
 INTRODUCTION
 COMPARISION
 GEOMETRY
 MESHING
 RESULT
 CONCLUSION
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3. INTRODUCTION
 Heat exchangers are a device that exchange
the heat between two fluids of different
temperatures that are separated by a solid
wall.
 In a heat exchanger forced convection allows
for the transfer of heat of one moving stream
to another moving stream.
 With convection as heat is transferred through
the pipe wall and transfers heat. This
maintains a temperature gradient between the
two fluids.
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4. DOUBLE PIPE HEAT
EXCHANGER
 A double pipe heat exchanger is one of the
simplest form of Heat Exchangers.
 There are two flow configurations: co-current is
when the flow of the two streams is in the
same direction, counter current is when the
flow of the streams is in opposite directions.
 The major use of these HX is sensible cooling
or heating applications
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5. COMPARISION
PARALLEL FLOW
CONTER FLOW
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6. GEOMETRY
(a) Inner tube
22 cm OD and 20mm ID of copper tube.
(b) Outer tube
42 cm OD and 40 cm ID of aluminium tube.
(c) Length of Heat exchanger is 100 cm.
(d) Hot and Cold fluid-WATER
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7. GEOMETRY
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8. FLUID DOMAIN
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9. MESHING
NODES 65416
ELEMENTS 53616
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10. PARALLEL
FLOW
COUNTER FLOW
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11. SETUP
MODELS:
Energy-ON
Viscous k-epsilon model
BOUNDARY CONDITIONS :
Cold Inlet: Velocity Inlet ( T=283 K & V=0.0001
m/s)
Cold outlet: pressure outlet ( T=300 K )
Hot inlet : velocity inlet ( T=350 K & V=0.0003
m/s)
Hot outlet: pressure outlet (T=300 K)
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12. 12

13. RESULTS-
TEMPERATURE
 PARALLEL
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14. COUNTER FLOW
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15. PRESSURE -
COUNTERFLOW15

16. PRESSURE-PARALLEL
FLOW16

17. RESULTS
PARALLEL FLOW COUNTER FLOW
TEMPERATURE DISTRIBUTION AND MASS
FLOW RATE
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18. HEAT TRANSFER
Q=m *Cp * ∆Th
PARALLEL FLOW COUNTER
FLOW
Q=.003x4.18x32.01 Q=.003x4.18x33.564
Q=0.4014 KW Q=0.42 KW
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19. CONCLUSION
 Thus from the CFD-Fluent Analysis we can
conclude heat transfer in counter flow is
predominant than parallel flow
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