Elasticity and relaxation properties of oral fluidстатья
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Дата последнего поиска статьи во внешних источниках: 18 мая 2022 г.
Аннотация:http://vestnik.pstu.ru/biomech/archives/?id=&folder_id=10590 The research is aimed at crating a method for rheological testing of viscoelasticfluids, the droplets of which, when stretched, form thinning filaments, i.e. exhibit theproperty of spinning. The typical example of such fluid is oral fluid (or mixed saliva).Among other things, the rheological features of the oral fluid actively affect themechanisms of transmission of infection by airborne droplets. In this work, the oral fluidwas studied both from the point of view of a participant in the transmission of infectionand as a model for studying the rheology of viscoelastic fluids. The method is based onvideo recording of the stretching of a drop of the test liquid between the legs of thetweezers and the subsequent spontaneous thinning of the formed capillary filament of theliquid. The process is controlled by the competition of forces of inertia, elasticity,capillarity. By analyzing the video recording, it is possible to trace the contribution of eachfactor and, within the framework of the Oldroyd/Maxwell rheological constitutive equation(rheological model), determine the numerical values of all model constants. The obtainedrheological characteristics of the oral fluid make it possible to theoretically model theprocesses of the formation of drops of oral fluid during sneezing, coughing, talking, aswell as the processes of collision of drops with protective masks, filters and otherobstacles. In general, the proposed method of rheological testing is applicable forstudying a wide class of viscoelastic fluids, including biological ones. Among the latter arebronchial sputum, synovial fluid, reproductive fluids, and others. The method isdistinguished by the simplicity of the experiment and the use of elementary equipment.