Experimental development of tubseide heat transfer correlations for laminar flow with and without inserts.
Approved for public release; distribution is unlimited === An experimental study of laminar flow heat transfer of an ethylene glycol/water mixture in an electrically heated horizontal tube using wire mesh (HEATEX) and twisted tape inserts was investigated. Twelve thermocouples, inserted in the tub...
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| Language: | en_US |
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Monterey, California. Naval Postgraduate School
2012
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| Online Access: | http://hdl.handle.net/10945/23668 |
| Summary: | Approved for public release; distribution is unlimited === An experimental study of laminar flow heat transfer of an ethylene glycol/water
mixture in an electrically heated horizontal tube using wire mesh (HEATEX) and
twisted tape inserts was investigated. Twelve thermocouples, inserted in the tube wall
at four longitudinal locations, enabled a mean inside experimental heat-transfer
coefficient to be accurately measured. A constant wall heat flux boundary condition
was placed on the wall by wrapping six 200 W flexible heater tapes tightly around the
tube. The ethylene glycol/water mixture provided a coolant Reynolds number
between 200-5000 and a Prandtl number between 30-140. Two smooth inside
diameters and a roped tube profile were tested with and without the inserts. Heattransfer
correlations for tubes without inserts were developed and compared with
theory for both thermally and hydrodynamically developing flow. Correlations were
also developed for the two types of inserts. |
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