HEAT TRANSFER CHARACTERISTICS ON VIBRATING VERTICAL SURFACE IN GRAVITATIONAL DIRECTION UNDER FILMWISE CONDENSATION
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Accession number;07A0043221
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| Title;HEAT TRANSFER CHARACTERISTICS ON VIBRATING VERTICAL SURFACE IN GRAVITATIONAL DIRECTION UNDER FILMWISE CONDENSATION |
| Author;
SHIRAIWA HIROYUKI
(Univ. Hyogo, Graduate School, JPN)
HOSOKAWA TSUTOMU
(Univ. Hyogo, JPN)
MAKINO TOSHIRO
(Kyoto Univ., JPN)
MATSUMOTO MITSUHIRO
(Kyoto Univ., JPN)
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Journal Title;Thermophys Prop
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Journal Code:X0031A
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ISSN:0911-1743
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VOL.27th;NO.;PAGE.57-59(2006)
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| Figure&Table&Reference;FIG.2, TBL.1, REF.6 |
| Pub. Country;Japan |
| Language;Japanese |
| Abstract;In recent years, there has been a demand for the development of a high-efficient heat exchanger for the purpose of saving energy and resources. A heat pipe is a heat exchanging device which operates with no external power in a closed system and transports a large heat amount with a very small temperature difference between the ends of the pipe. Therefore, a heat pipe is extremely effective at solving energy and environmental problems. A thermosyphon is a gravity-assisted heat pipe which uses gravity to drive the working fluid from the condenser section to the evaporator section. Many thermosyphons are of the geostationary type, and they have been the subject of considerable research. In contrast, there seem to be few studies concerning accelerating thermosyphons. Moreover, filmwise condensation is generally observed in the thermosyphon. In this study, we have calculated the heat transfer coefficient of filmwise condensation by the Nusselt theory in consideration of pseudo-eddy diffusivity of heat (Eq. (7)) in the condensate film, when the condensing surface was sinusoidal vibrated. As a result, from Figure 2 and Table 1, we found that the heat transfer coefficient of filmwise condensation was enhanced by the vibration of the condensing surface. In addition, the increasing rate H'*' of the heat transfer coefficient by the vibration increased with the smaller subcooling .DELTA.T of the condensing surface, because the flowing velocity of the condensate film decreased with the smaller .DELTA.T. (author abst.) |
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