Effect of Superimposed Vibrations on Droplet Oscillation Modes in Prilling Process

Abstract

This article was aimed to solve an urgent problem of ensuring quality for prilling processes in vibrational prilling equipment. During the research, the need for the application of vibrational prilling to create a controlled impact on the process of jet decay on droplets with the proper characteristics was substantiated. Based on the experimental and theoretical studies of the process of decay of a liquid jet into drops, axisymmetric droplet oscillation modes for the different frequencies were observed. Frequency ranges of transition between modes of decay of a jet into drops were obtained. As a result, the mathematical model of the droplet deformation was refined. The experimental research data substantiated this model, and its implementation allowed determining the analytical dependencies for the components of the droplet deformation velocity. The proposed model explains the existence of different droplet oscillation modes depending on the frequency characteristics of the superimposed vibrational impact. Based on an analytical study of the droplet deformation velocity components, the limit values of the characteristics defining the transition between the different droplet oscillation modes were discovered. Analytical dependencies were also obtained to determine the diameter of the satellites and their total number.

Substantiation of a New Calculation and Selection Algorithm of Optimal Heat Exchangers with Nanofluid Heat Carriers Taking into Account Surface Forces

“…It is noteworthy that this simulation of the behavior of nanoparticles in a turbulent flow at the nanoscale completely coincides with the simulation of the behavior of dispersed liquid droplets at the macroscale, which is confirmed experimentally [35].…”

“…If the number Bl (34) is represented in the form (35), it is similar to the left side of the Eq. ( 1), and if it is represented in the form (36), then it is similar to the right side of equation ( 1).…”

Rational Choice of a Basket for the Rotational Vibropriller

“…The separation or movement of particles and the separation of coarse or fine particles of the fluid flow are critical for ensuring product quality in most industrial processes that involve filtration [7]. The existence of different oscillation modes of droplets depending on the frequencies of the superimposed oscillation is explained in [8] using the proposed model. The study proves this model, and its realization allows us to define analytical dependence for the strain-rate component of droplets.…”

Influence of Vibration Magnitude in Machining of Materials by Turning Technology

“…One of the most widespread aspect of technical diagnostics is the vibration diagnostics, which is used to evaluate various rotary and other motion components of production machines in which mechanical vibration occurs [Kocman 2001, Lee 2007. Vibrations serve as a source of information that can be analyzed and then evaluate the technical and operational condition of machines [Tlusty 1999, Modrak 2019, Pavlenko 2020. In all machining processes, various factors can have both positive but also negative effect.…”

“…These factors also include vibrations that may be related to the cutting process itself or may be caused by external sources [Cameron 1986]. These vibrations are undesirable and can cause several problems [Panda 2018, Peterka 2020, Sentyakov 2020]. In the first place, they affect the machine itself and thus its service life, tool life and can be a source of excessive noise [Sick 2002, Sidhpura 2012, Bozek 2021.…”