Approved for public release; distribution is unlimited / Heat-transfer measurements were made for condensation of
R-113 and steam on a smooth tube and on three finned tubes
with rectangular shape fins. These tubes had a fin height
and width of 1.0 mm and spacings of 0.25, 1.5, and 4.0 mm
(tubes A, B, and C respectively) . Data were taken by
increasing the vapor velocity from 0.4 to 1.9 m/s for R-113
and 4.8 to 31.3 m/s for steam. For both fluids, the
improvement of the condensing heat-transfer coefficient with
vapor velocity was smaller for the finned tubes than for the
smooth tube. For R-113, the smooth tube experienced a 32
percent improvement with vapor velocity, where the finned
tubes (tubes A, B and C respectively) experienced
improvements of only 0, 5 and 10 percent. For steam, the
smooth tube experienced a 62 percent improvement, whereas
the finned tubes (tubes A, B, and C respectively)
experienced improvements of only 31, 11, and 9 percent.
These test results show that, although finned tubes can
provide significant heat transfer enhancement over smooth
tubes at low vapor velocities, the degree of enhancement
becomes smaller as vapor velocity increases. / CBT-8603582 (NSF) / http://archive.org/details/effectofvaporvel00hopk / National Science Foundation / Lieutenant Commander, United States Navy
| Identifer | oai:union.ndltd.org:nps.edu/oai:calhoun.nps.edu:10945/23193 |
| Date | 12 1900 |
| Creators | Hopkins, Charles Louis III |
| Contributors | Marto, P.J., Wanniarachchi, A.S., Naval Postgraduate School (U.S.), Mechanical Engineering |
| Publisher | Monterey, California. Naval Postgraduate School |
| Source Sets | Naval Postgraduate School |
| Language | en_US |
| Detected Language | English |
| Type | Thesis |
| Format | 120 p., application/pdf |
| Rights | This publication is a work of the U.S. Government as defined in Title 17, United States Code, Section 101. Copyright protection is not available for this work in the United States. |
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