Study of the Weber number impact on secondary breakup of droplets of coal water slurries containing petrochemicals

Abstract

The research presents the numerical modeling findings of the secondary breakup of droplets of coal water slurries containing petrochemicals (CWSP). The modeling method of the secondary droplet breakup is based on the VOF method for interface resolution, LES model for describing turbulence, and the technology of adapted dynamic grids. We have established the droplet breakup modes depending on the Weber number varying from 7 to 212. We have also examined the structure of the flow behind droplets. We have tested the numerical method, and the results are in good agreement with the existing experiments.

Model Issues Regarding Modification of Fuel Injector Components to Improve the Injection Parameters of a Modern Compression Ignition Engine Powered by Biofuel

“…The results showed that the micro-explosion of drops in the biofuel stream needs more energy because of higher viscosity and surface tension compared to diesel fuel. The structure of primary and secondary breakup droplets depends on the Weber number Minakov et al [20].…”

Impact of Hydrodynamic Cavitation on the Properties of Coal-Water Fuel: An Experimental Study

“…To determine the rheological behavior of these suspensions produced by a rotational viscosimeter, the data on the dependence of viscosity of suspensions on the shear rate were used to define the parameters of rheological models by least-squares approximation. The coal-water fuel can be a non-Newtonian viscoplastic fluid, and its behavior can be described by one of the most frequently used rheological models: power law and Bingham …”

“…The coal-water fuel can be a non-Newtonian viscoplastic fluid, and its behavior can be described by one of the most frequently used rheological models: power law and Bingham. 29 To approximate the rheological parameters of water-coal suspension, we used the power law model where K is the consistency factor, Pa•s n ; γ̇is the shear rate, s −1 ; and n is the flow behavior index. The Bingham model is also used:…”

Spraying of Composite Liquid Fuels Based on Types of Coal Preparation Waste: Current Problems and Achievements: Review

“…It may also take place upon collision with the channel wall or with an intentionally installed obstacle [29] or due to various internal overheating mechanisms [37,38]. Additionally, the methods of secondary atomization of droplets may provisionally include the impact of gas jets with excess pressure on the polydisperse fuel flux formed by the injector directly in the combustion zone [27,58,59]. The morphology of the phenomena of secondary disintegration of droplets is very diverse, and it depends on many factors.…”

“…The morphology of the phenomena of secondary disintegration of droplets is very diverse, and it depends on many factors. Therefore, the controlled use of the atomization process can only be based on a large body of empirical data that form the basis for the development of the respective predictive models [56,59,60].…”