@inproceedings{47da80d00ade4b25b96d60e7dafec888,
title = "Interfacial structures and regime transition in co-current downward bubbly flow",
abstract = "The vertical cocurrent downward air-water two-phase flow was studied under adiabatic condition. In view of studying the effect of flow area on interfacial structure and regime transition, round tubes of 25.4-mm ID and 50.8-mm ID were employed as test sections. The flow regime map was constructed for each test section by employing a newer approach. Unlike the conventional flow visualization method, the present approach minimizes the subjective judgment in determining the flow regimes. It was found that the flow regime in the co-current downward flow strongly depend on the channel size. The local two-phase flow parameters were acquired by the multi-sensor miniaturized conductivity probe in bubbly flow. They include: the local time-averaged void fraction, interfacial area concentration, bubble velocity and bubble Sauter mean diameter. The area-averaged data acquired by the impedance void meter were analyzed by the drift flux model. Three different distributions parameters were developed for the different ranges of non-dimensional superficial velocity, defined by the ration of total superficial velocity to the drift velocity. The new correlations can be applied to a co-current downward two-phase flow in a wide range of flow regime spanning from bubbly to annular flow.",
author = "S. Kim and Paranjape, {S. S.} and M. Ishii and J. Kelly",
year = "2003",
doi = "10.1115/fedsm2003-45541",
language = "English (US)",
isbn = "0791836967",
series = "Proceedings of the ASME/JSME Joint Fluids Engineering Conference",
publisher = "American Society of Mechanical Engineers",
pages = "1595--1606",
editor = "A. Ogut and Y. Tsuji and M. Kawahashi",
booktitle = "Proceedings of the 4th ASME/JSME Joint Fluids Engineering Conference",
note = "4th ASME/JSME Joint Fluids Engineering Conference ; Conference date: 06-07-2003 Through 10-07-2003",
}