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ISSN Печать: 2169-2785
ISSN Онлайн: 2167-857X
Indexed in
TWO-DIMENSIONAL PROJECTED GAS−LIQUID INTERFACIAL AREA IN BOILING FLOW
Краткое описание
Although the gas−liquid interface in boiling flow is very important, it is difficult to clearly show the relationship between the gas−liquid interface in the channel and heat transfer characteristics. The interfacial area concentration (IAC) is one of them, however its measurement method is not easy. Here, a two-dimensional projected gas−liquid interfacial area (2D-PGIA) is proposed as a simple index. 2D-PGIA is an index obtained by image processing from a video image which is two-dimensional information, and other parameters such as velocity vector of bubbles is not considered. Flow boiling experiments using vertical 4-mm-diameter transparent heated tube were carried out to investigate the relationship between heat transfer characteristics and 2D-PGIA. From the result analyzed images in bubble, slug, and annular flows, it is clear that the 2D-PGIA time profile well follows the temporal change of the inner wall temperature in all flow regimes. Especially in bubble flow, heat transfer increases as 2D-PGIA increases, 2D-PGIA reaches the maximum value just before DNB, and then 2D-PGIA drastically decreases when DNB occurs. From our experimental results, 2D-PGIA will be a useful index for understanding boiling heat transfer in a tube.
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Belosludtsev V. V., Zaitsev D. V., Influence of time reference point selection on representation of bubble growth data during flow boiling in microchannels, THERMOPHYSICAL BASIS OF ENERGY TECHNOLOGIES (TBET 2019), 2212, 2020. Crossref