Design and Manufacturing of Heat Exchangers
Fundamentals of Related Transport Processes
| Multifluid
Heat Exchangers |
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In many applications it is necessary to involve (simultaneously)
more than two fluids in a thermal interaction. Designs of
such exchangers, say two fluids are in thermal contact through
a third one i.e., not directly - as in a three fluid heat
exchange) may be tricky. Temperature fields in such systems
may be very complex and therefore the design issues challenging.
Temperature distributions (dimensionless) within
a three fluid cross-flow heat exchanger. Notice the existence
of a temperature cross phenomenon that may compromise the design.
(Source: Sekulic, D.P., Thermal Design Theory of Three-Fluid
Heat Exchangers, Advances in Heat Transfer, Vol. 26,
1995, pp. 219-328; Baclic, B.S., Sekulic, D.P., and Gvozdenac,
D.D., Performance of three-fluid single-pass crossflow heat
exchanger, Heat Transfer 1982, Vol. 6 Hemisphere, Washington,
DC, pp. 167-172.)
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Dimensionless temperatures of all three fluids
along the respective dimensionless flow lengths. Note an appearance
of internal temperature crosses in parallel stream three fluid
heat exchangers - an impossible event in a two-fluid heat exchanger
in a parallel flow (either co-current or countercurrent). This
event may lead to a design that features a significant loss
of heat transfer capability. (Source: Sekulic, D.P., A compact
solution of the parallelflow three-fluid heat exchanger problem,
Int. J. Heat Mass Transfer Vol. 37, 1994, pp. 2183-2187.)
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• Fundamentals of Related Transport
Processes Home
• Heat Transfer Enhancement
• Complex Flow Arrangements
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| Contact Dr.
Dusan P. Sekulic, UK Center for Manufacturing, 210A CRMS
Bldg., College of Engineering, University of Kentucky, Lexington,
KY 40506. Phone 859-257-2972 or 859-257-6262
Ext. 425, Fax 859-257-1071, e-mail: sekulicd@engr.uky.edu
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