The hydraulic resistance of thermoviscous liquid flow in a plane channel with a variable cross-section

Calculation of hydraulic resistance in the separator of the direct-flow control valve with a rotary lock

“…The study of the dependence of hydraulic resistance in laminar and turbulent flow regimes of working fluid media on various factors is devoted to many works [13,[17][18][19][20][21]. However, the theory of turbulent flows belongs to a developing scientific direction, which contributes to the development of several types of methods for calculating the hydraulic resistance coefficient: theoretical and experimental [11][12][13]17], simulation [18][19][20][21], analytical [13].…”

“…The second group of methods [18][19][20][21] uses both ready-made software products and various difference schemes to obtain a numerical solution of the system of classical equations of continuity, motion and energy conservation for an incompressible working medium with special properties in channels of various shapes. For example, in [18], the case of the dependence of the local hydraulic resistance in a flat channel with a sudden narrowing on the temperature parameter was numerically investigated. Within the framework of numerical modeling in [19], the influence of wall roughness and rotational effects on the formation of turbulent flows in the channel was studied.…”

“…In contrast to the known methods of constructing simulation models [18][19][20][21], the proposed analytical method of calculation is based on a qualitative assessment of the specified coefficient in the implementation of throttling of fluid flows in the "separator-rotary lock" [16] unit, depending on the design and operating parameters of the process. At the same time, the analysis of the simulation results obtained by the authors [13,[22][23][24] for the case of throttling of fluid flows in the separator of an axial valve [25] allows us to put forward a working hypothesis about the most significant factors affecting the process under study in the main valve assembly [16].…”