Abstract
Determining of minor losses coefficient is very complicated problem. Analytical methods are often very difficult and experimental methods are very expensive and time-consuming. Consequently, the use of numerical methods seems to be a good solution, but there are no publications describing this issue. Therefore, the paper is describing the numerical method of determining the minor loss coefficient ξ on the example of elbows with circular cross-section.
Highlights
Pneumatic, hydraulic or ventilating systems are just a few examples of systems in which various types of fittings are used
Minor (ξ) and major/head (λ) loss coefficients are used to calculation of pressure losses in different kind of systems
Major loss coefficient λ refers to energy losses caused by friction, while minor loss coefficient ξ to energy losses caused by flow disorder
Summary
Hydraulic or ventilating systems are just a few examples of systems in which various types of fittings are used. The most universal and generally used is the experimental way It is time-consuming and expensive process, because the minor loss coefficient ξ is dependent on Reynolds number, duct dimensions and other [7]. It should be found numerical way to determination of minor loss coefficient ξ for different kind of fittings It would reduce the amount of experimental research. In this investigation is presented numerical way of minor loss coefficient ξ designation for elbow with circular cross-section. This kind of fitting is commonly used in different systems and its minor loss coefficients ξ, can be found in literature [7, 8] and in standards [9]. During investigation Reynolds number Re was define as: Re vDh where μ is kinematic viscosity of working fluid
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