Дослідження енергетичних характеристик потоку рідини
Abstract
UDC 631.3:621.1
Study of energy characteristics
FLUID FLOW
V. Vasilenkov, A. Shuprina
In the study of fluid flow in channels or conduits important is not only dependent on the flow rate of the living area section, but the relationship between speed and pressure flow. The relationship between these quantities by Daniel Bernoulli equation, the basic equation of energy flow of moving fluid evaluation.
Noteworthy geometric consideration (hydraulic) and power (physical) content of all components of the equation that will give the answer to the energy characteristics of the fluid flow.
The purpose of the work. The study of energy characteristics of fluid flow using the Bernoulli equation.
Materials and methods of research. Movement of fluid in the pipeline variable section. Graphic representation of members of the Bernoulli equation.
Results. Geometric (hydraulic) interpretation of the Bernoulli equation.
The amount of the three components of the equation, as each part separately, has a linear dimension [m]. This amount is called the H became full height or full pressure. The first part of z - height position of the center of gravity section. The second component – piezometric height. The sum of these two heights – dynamic pressure
Power interpretation of the Bernoulli equation
The sum of all three components and is full of energy density liquid in this section.
Reducing the specific potential energy (piezometric head), referred to the length of the site where a reduction is called the average piezometric slope. As piezometric line can decrease (an increase velocity) or rise (with decreasing flow rate), the piezometric slope can be positive under.
Conclusions
The resulting power characteristics of fluid flow, such as piezometric line (line specific potential energy) as well as a full line pressure (full specific energy). In areas where the living section of the pipeline does not change the value of the speed constant pressure, piezometric line will be parallel to the line of full pressure. When narrowing pipeline velocity and dynamic pressure increases, while expanding - decrease.
References
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Naymanov, А. Y., Nikisha, S. B. (2004). Vodosnabzheniye [Water supply]. Donetsk: Nord-pres, 649.
Kravchenko, V. S. (2009). Vodopostachannya ta kanalizatsiya [Water supply and sewerage]. Kyiv.: Kondor, 288.
Tuhai, A. M., Orlov, V. O., Orlova, A. M. (2011). Vodopostachannya ta vodovidvedennya: pidruchnyk [Water and wastewater]. Kyiv: Znannia, 359.
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