Conical Two-Phase Swirl Flow Atomizers—Numerical and Experimental Study

Abstract

This paper presents the results of numerical simulations for the developed and discussed conical two-phase atomizers with swirl flow, differing in the ratio of the height of the swirl chamber to its diameter. Experiments were carried out for SAN-1 with HS/DS = 1 and SAN-2 with HS/DS = 4 atomizers. The study was conducted over a range of Reynolds number for liquid ReL = (1400; 5650) and for gas ReG = (2970; 9900). Numerical calculations were performed with the use of computational fluid dynamics (CFD), which were verified on the basis of experimental data. Based on the analysis of experimental studies and simulations results the influence of operational parameters and changes of the atomizer geometry on the generated spray was demonstrated. As the gas flow rate increased and the swirl chamber height decreased, the spray angle increased. Higher velocity values of the liquid and greater turbulence occur in the center of the spray. The flow inside the atomizer determines the nature of the spray obtained. The geometry of the swirl chamber influences the air core formed inside the atomizer, and this determines the atomization effect. The results of numerical simulations not only confirm the results of experimental studies, but also provide additional information on internal and external fluid flow.

Design of a Cryogenic Duplex Pressure-Swirl Atomizer through CFDs for the Cold Conservation of Marine Products

“…(Figure 4, Figure 5 and Figure 6). In the numerical simulation, a tetrahedral and hexahedral mesh were used to control the internal flow of both atomizers, taking into account the inlet boundary conditions with a specific pressure, as well as a specific outlet pressure and no slip on the walls [18]. Subsequently, in order to achieve mesh independence in the simulation, it is necessary to consider the dimensionless distance from the wall, which is known as (y+).…”

“…By calculating the shear stress of the wall (𝜏w), the friction velocity (U𝜏), and Equations ( 18) and (19), respectively, by considering the closest distance between the cell and the wall, it is possible to replace Equation ( 16) and obtain a range of values. In the numerical simulation, a tetrahedral and hexahedral mesh were used to control the internal flow of both atomizers, taking into account the inlet boundary conditions with a specific pressure, as well as a specific outlet pressure and no slip on the walls [18]. Subsequently, in order to achieve mesh independence in the simulation, it is necessary to consider the dimensionless distance from the wall, which is known as (y+).…”

Spray curtains as devices for surface spraying during the SARS-CoV-2 pandemic

“…The atomization of liquids is used in many areas, including combustion and firefighting ( Gai et al, 2021 ; Panchasara and Ashwath, 2021 ). The most important parameters that determine the suitability of a given atomizer, and also the effectiveness of the atomization process, include the distribution of droplet sizes and the equivalent diameters of the droplets, among which the Sauter mean diameter is the most popular ( Ochowiak et al, 2021 ; Juslin et al, 1995 ; Wan et al, 1995 ). The SARS-CoV-2 coronavirus pandemic affected the health care and economy.…”