Abstract
This article reports the results of a study into the effect of operating parameters on the occurrence and course of gas–liquid two-phase phenomena during the fogging process carried out with the use of a conical pressure-swirl nozzle. Four alternatives of the stub regulation angles and four values of pressure of air supply to the nozzle were tested as part of the current research. The range of the investigated variables was common for the operation of fumigators used to prevent the spread of SARS-CoV-2 virus. The liquid flow rate (weighting method), the field of velocity, and turbulent flow intensity factor, as well as velocity profiles over the section of 1 m from the nozzle were determined using the particle image velocimetry (PIV) technique. The obtained results were correlated with the measurements of the diameters of spray droplets using the laser light scattering (LLS) technique. On the basis of this research, a dependence between the nozzle parameters and the spray cone pattern was identified in terms of dynamics and droplet diameter distribution. As a result of the research, a wide range of parameters were identified in which the fogging process was carried out in a stable and repeatable manner. There were exceptions to this rule only in the cases when there was a deficiency of the liquid necessary to generate a two-phase mixture.
Highlights
This study demonstrated that both methods make it possible to perform reliable measurements of spray and that the nozzle geometry significantly shapes the behavior of the droplets
An important issue related to the operation of fogging systems is associated with the consumption of the liquid utilized to generate a spray in the fumigation system
In order consumption of the liquid utilized to generate a spray in the fumigation system
Summary
Spray distribution tests during the fumigation process are much less frequently undertaken In this respect, there is a noticeable scarcity of knowledge that needs to be supplemented with publications that extend to areas beyond the fogging process. The changes in the spray angle depending on the rheological properties of the fluid feeding the conical pressure-swirl atomizer were investigated in [30] Other studies in this area, such as [31,32], contained results of research studies in this contained of on research concerned with the effect concerned witharea, the such effectas of[31,32], the nozzle outlet results diameter the spray characteristics.
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