Abstract
The paper presents the results of analytical solution of the model of heat transfer for non-contacting face seals. Comparative analyses were performed for various physical properties of materials used for slide rings. A mathematical model includes a series of differential equations of partial derivatives with generally used boundary conditions, i.e. the Reynold’s equation, energy equation and heat transfer equations, which describe the heat transfer in sealing rings with surrounding medium. Heat transfer equation is written in the Cartesian coordinate system and solved using the Green’s functions method. Theoretical studies made it possible to draw a number of practical conclusions on the phenomena of heat transfer in the node seal. The presented model will allow more accurate identification of the heat transfer mechanism in the node seal. The results will help to select appropriate materials for sealing rings, depending on operating conditions of non-contacting face seals.
Highlights
Sealing technique used in flow machines is one of the key and steadily developing branches of applied research
Manufacturers of the contactless face seals declare working temperature ranges of those components to be between -20 and 220 °C for gas dynamics seals, and between -54 and 650 °C for contactless face seals co-functioning with other media [20] and under extremely different operating parameters [14]
Because the assumed height of the radial gap varies by several micrometres, there might occur a rapid evaporation of the working medium in the fluid film
Summary
Sealing technique used in flow machines is one of the key and steadily developing branches of applied research. Because the assumed height of the radial gap varies by several micrometres, there might occur a rapid evaporation of the working medium in the fluid film This determines how research is undertaken and conducted. The development of new technologies allows for preparation of materials with physical properties that enable dissipation of huge amounts of heat flux into the environment It is especially important in cases, where contactless face seals are used in devices that pump hazardous media, such as chemically aggressive or explosive substances whose leakage could lead to contamination of the natural environment or other accidents
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