Наукові вісті Далівського університету № 21

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Browsing Наукові вісті Далівського університету № 21 by Subject "turbulent flow"

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    Model of Solid Particle Deposition from the Turbulent Gas FLow.
    (СНУ ім. В. Даля, 2021) Granovskiy, E.; Smalii, V.; Грановський, Е. О.; Смалій, В. В.
    The deposits of solid particles on the walls of pipeline are the cause of pipeline choking and even rupture accidents in industry each year causing misleading the process intent, destructions, human casualties as well as environmental pollutions. To measure and to manage the risks caused by particles deposition are one of the objectives of modern process safety. The measure of risk means to find a probability of event occurring during some specific duration of time (most often 1 year) and to know the consequences of the event. To be able to find the probability of pipeline choking the dynamic model of particle deposition need to be developed. There are numerous studies of solid particle deposition on the walls of pipeline with turbulent or laminar flows of compressible or incompressible liquids. The model of solid particle deposition from the turbulent gas flow has been proposed and qualitatively verified under this study. The solution of governing equations with applying of finite elements method and numerical analysis has been found. In the basics of the current study the model of particle deposition intensity from the turbulent flow developed by S. K. Beal (1970) has been applied. The model accounts both eddy and Brownian diffusivity factors which are competing with each other depending on particle’s size scale and flow properties. A comparison of the model’s behaviour with the other particle deposition model has been provided and showed a good qualitative agreement with other studies. The model can be applied in numerical risks analysis (with caution) in the part of time duration calculation which causes the critical increasing of pipeline’s resistance. Also finite element method gives the profile of deposits (deposition thickness distribution along the pipe) which can be useful to predict the possible coordinates of the maximum deposition thickness as well as to study the influence of different initial conditions such as particle and fluid properties on the deposition rate and distribution as well as to observe a hydraulic regime in the pipeline.