Author
John C. Dallman
Bio: John C. Dallman is an academic researcher from Urbana University. The author has contributed to research in topics: Drop (liquid). The author has an hindex of 1, co-authored 1 publications receiving 133 citations.
Topics: Drop (liquid)
Papers
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TL;DR: In this article, the distribution of drop sizes can be characterized by an upper limit, log normal function with only one of the three parameters, the volume median diameter, a strong function of flow conditions.
Abstract: The droplets that appear in annular gas-liquid flows are formed by the eruption of wavelets from the surface of the wall layer. Ninety per cent of the volume of this dispersed liquid is carried by only about 10% of the drops. We find, as suggested by Wicks and Dukler, that the distribution of drop sizes can be characterized by an upper limit, log normal function with only one of the three parameters, the volume median diameter, a strong function of flow conditions. A method for predicting the average diameter is suggested which is consistent with a theoretical interpretation based on a Kelvin-Helmholtz mechanism, whereby the destabilizing force is the pressure variation over the wavelets.
144 citations
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TL;DR: In this article, the authors reviewed the available information on the creation, size and velocity, and removal of drops in annular gas-liquid flow and showed that despite the large number of papers that have been published, there are still some fundamental questions which remain unanswered and there are large gaps in the parameter ranges to be considered.
252 citations
TL;DR: In this article, two correlations of measurements of entrainment for annular flow in horizontal pipes are presented for liquids with viscosities close to that of water, and a theoretical analysis for the rate of deposition is presented for high and low gas velocities.
153 citations
TL;DR: In this article, an experimental study of the droplet size and velocity distributions in gas-liquid annular upflow is reported for a 50.8 mm i.d. vertical tube.
118 citations
TL;DR: In this paper, the authors reviewed most of the recent literature on annular flow, with emphasis in all those variables and processes occurring in the liquid-gas interface that cause droplet entrainment.
107 citations
TL;DR: In this paper, a correlation for entrainment in vertical gas-liquid annular flows is presented, which is based on a balance between the atomization of the wall layer and the rate of deposition of drops.
103 citations