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P. E. Trofimenko, M. V. Naida, A. V. Khomenko, and Yu. I. Pushkarov
Experimental Measurement of Film Thicknesses on a Static Film Former and a Film Centrifugal Sprayer
0657–0666 (2022)

PACS numbers: 47.20.Ib, 47.61.-k, 62.20.Qp, 62.25.-g, 68.08.-p, 68.15.+e, 81.15.Rs

Knowledge of the local and average film thicknesses on the film former is necessary to study the hydrodynamics of the flow, the intensity of the heat and mass transfers. Local values of the film thickness are necessary to clarify the hydrodynamic structure under specific flow conditions, to study the features of the dynamics of the motion of a thin liquid layer and changes in the intensity of the heat and mass transfers in it. Local film thickness depends on the time and density of irrigation, the physical properties of the liquid and the state of the surface, and so on. Many different methods are known for measuring local film thicknesses. We have developed a new method and device for measuring local film thicknesses. The article considers methods and devices for experimental determination of film thickness on a static film former, as well as local film thicknesses flowing from a film centrifugal spray, namely, the schematic diagrams of experimental installations (stands) for determining the thickness of the film. Stand No. 1 is designed to study the thickness of the film, starting from a few nanometers, and the nature of the formation and movement of the film surface along the film former. The main parameters of film formation on static film formers include spreading width of the film, film thickness, liquid viscosity, surface tension, liquid density. The electrical contact method is used to measure the film thickness. Stand No. 2 is designed to measure local film thicknesses from a film former of a centrifugal atomizer. The results of these studies can be used for industrial design of liquid sprayers. On rotating blades of different geometry, it is possible to form a jet of liquid into a thin film. Having formed a film of the required parameters, it can be dispersed to obtain the desired dispersion of the spray. These facts served as a basis for the development of low-speed rotating film sprayers.

Key words: film, experimental stand, film former, liquid, local thickness, centrifugal sprayer.

https://doi.org/10.15407/nnn.20.03.657

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