Local pool boiling coefficients on horizontal tubes |
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Authors: | Myeong-Gie Kang |
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Affiliation: | (1) Department of Mechanical Engineering Education, Andong National University, 388 Songchun-dong, 760-749 Andong-city, Kyungbuk, Korea |
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Abstract: | Local pool boiling on the outside and inside surfaces of a 51 mm diameter tube in horizontal direction has been studied experimentally
in saturated water at atmospheric pressure Much variation in local heat transfer coefficients was observed along the tube
periphery On the outside surface the maximum and the minimum are observed at θ=45° and 180°, respectively However, on the
inside surface only the minimum was observed at θ=0° Major mechanisms on the outside surface are liquid agitation and bubble
coalescence while those on the inside surface are micro layer evaporation and liquid agitation As the heat flux increases
liquid agitation gets effective both on outside and inside surfaces The local coefficients measured at θ=90° can be recommended
as the representative values of both outside and inside surfaces |
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Keywords: | Pool Boiling Annuli Horizontal Tube Heat Transfer |
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