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ISSN Online: 2377-424X

ISBN Print: 978-1-56700-421-2

International Heat Transfer Conference 15
August, 10-15, 2014, Kyoto, Japan

Effect of Inclination Angle onto Heat Transport Characteristics of Bubble-Actuated Circulating Heat Pipe (Bach) Covering High-Temperature Region

Get access (open in a dialog) DOI: 10.1615/IHTC15.hpp.009125
pages 3807-3817

Sinopsis

This study aims to find out heat transport characteristics of the Bubble-Actuated Circulating Heat pipe (BACH) with evaporator section under high temperature and the whole pipe at inclined positions, to which we consider to approach from investigating the possibility of efficient waste heat recovery from automobile exhaust by using a BACH. Up to now, we have tested a BACH using distilled water as the working fluid under conditions of 20% and 74% of fill ratio, 45~255ºC and 21~23ºC of heating and cooling temperatures, respectively and - 10.5 ~ 90° of inclination angle to the level. The obtained results show that its heat transport rate was 0~400W and its thermal resistance was 0.05~0.3K/W. The data also indicate that there was a peak value of heat transport rate at 20° for the case of 20% as the fill ratio and 30° for 74%. And the value didn’t change so much when getting steeper than that. Besides, in both cases of different fill ratio, it has been validated that the BACH didn’t achieve the highest heat transport rate at vertical position. However, it was quite sensitive to the inclination angle in the range of 0~5°. It was postulated that whether the liquid circulation exists and the condition of evaporation surface area including the condensate films are important accounts for the change in the heat transport rate.