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Laws of Bubble Coalescence and their Modeling (pp. 211-240). Chapter 4 in Book “New Developments in Hydrodynamics Researchкнига
- Автор: Boshenyatov Boris
- Год издания: 2012
- Место издания: Nova Science Publishers, Inc USA New York
- Объём: 316 страниц
- ISBN: 978-1-62081-223-5
- Аннотация: Abstract: The process of bubble coalescence is an important phenomenon, which has great influence on bubble sizes, gas volume fraction and gas-liquid mass transfer in many natural and technological processes. The physical laws that determine the bubble coalescence rate are not yet well understood. So, for example, most if not all mathematical models of coalescence have been developed based on the so-called "drainage mechanism" coalescence. These models contain at least two (or three) adjustable parameters. The values of these parameters are recommended by various authors may differ by several times. In this chapter, it was developed an alternative approach describing the process of bubble coalescence. It based on the assumption that the probability of bubble coalescence is completely determined by the dimentionless parameters of the liquid and bubbles before their collision. In this case, there is no need for any assumptions about physical mechanisms of the process of coalescence. The author‘s experimental data were used together with data available in the literature to develop a dimensionless correlation for predicting the bubble coalescence probability in this way. Validity of the basic models of bubble coalescence including a novel dynamic model was investigated, using the method of Direct Computer Simulation and representative experimental data. It is shown that the proposed dynamic model of bubble coalescence gives the best description of the coalescence process and, accordingly, the spatial distribution of bubble sizes and other characteristics of gas-liquid systems.
- Добавил в систему: Бошенятов Борис Владимирович