Mathematical Modeling of Hydraulic Resistance in Pipes With Rough Walls

In recent years, the numbers of patents have been devoted to the development of rough pipes. The technique theoretical settlement determine of factor of hydraulic resistance for round pipes with rough walls is developed on the basis of a principle of a superposition of complete viscosity in turbulent a layer mainly distinguished from the existing theories. The received results of account for the extended range of determining parameters much distinguished from appropriate given for round pipes with turbulizers, specify a level и intensification of heat exchange.

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MATHEMATICAL MODELING OF HEAT EXCHANGE IN DIRECT FLAT CHANNELS AND DIRECT ROUND PIPES WITH ROUGH WALLS UNDER THE SYMMETRIC HEAT SUPPLY

Herald of Dagestan State Technical University Technical Sciences ◽

10.21822/2073-6185-2017-44-2-126-141 ◽

2017 ◽

Vol 44 (2) ◽

pp. 126-141

Author(s):

I E. Lobanov

Keyword(s):

Mathematical Modeling ◽

Heat Exchange ◽

Heat Supply ◽

Rough Walls

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Mathematical modeling of hydraulic resistance in pipes with rough walls

Aeronautics and Aerospace Open Access Journal ◽

10.15406/aaoaj.2018.02.00032 ◽

2018 ◽

Vol 2 (2) ◽

Author(s):

Lobanov Igor Evgenjevich

Keyword(s):

Mathematical Modeling ◽

Hydraulic Resistance ◽

Rough Walls

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MODELING THE HYDRAULIC CHARACTERISTICS OF DRAIN VALVE AND BURST FITTING OF AN AIRCRAFT ACCIDENT-RESISTANT FUEL SYSTEM

Computational nanotechnology ◽

10.33693/2313-223x-2020-7-3-37-44 ◽

2020 ◽

Vol 7 (3) ◽

pp. 37-44

Author(s):

KONSTANTIN NAPREENKO ◽

◽

ROMAN SAVELEV ◽

ALEKSEY TROFIMOV ◽

ANNA LAMTYUGINA ◽

...

Keyword(s):

Mathematical Modeling ◽

Hydraulic Resistance ◽

Hydraulic Calculation ◽

Fuel System ◽

Hydraulic Characteristics ◽

System A ◽

Ansys Cfx ◽

Calculation Results ◽

Scale Experiment ◽

Aircraft Accident

The article discusses methods for determining the hydraulic resistance of units of an accident-resistant fuel system. A detailed description of the need to create such fuel systems for modern helicopters is given. The development of such systems today is impossible without the use of the method of mathematical modeling, which allows to qualitatively solve problems arising in the design process. To obtain accurate research results, it is necessary to have a complete description of all elements and assemblies of the system. Methods for determining the hydraulic characteristics of AFS elements using the drag coefficient, reference literature and CFD codes are considered. As the investigated AFS units, a drain valve and burst fitting were studied in the article. A hydraulic calculation of these AFS elements ware performed, the simulation results are presented in the ANSYS CFX software package. Also as the calculation results of bursting fitting, the pressure distribution fields of full and static pressure, velocity and streamlines are also shown. An experimental setup for validating the results obtained using the mathematical modeling method is considered, as well as a methodology for conducting a full-scale experiment to determine the hydraulic resistance of the unit. Materials have been prepared for inclusion in a one-dimensional mathematical model of an accident-resistant fuel system.

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Enhancement of the efficiency and specific output energy of an electric-discharge CO laser by intensification of heat exchange with the walls

Soviet Journal of Quantum Electronics ◽

10.1070/qe1987v017n11abeh010858 ◽

1987 ◽

Vol 17 (11) ◽

pp. 1385-1387 ◽

Cited By ~ 14

Author(s):

G M Grigor'yan ◽

B M Dymshits ◽

S V Izyumov

Keyword(s):

Heat Exchange ◽

Electric Discharge ◽

Output Energy ◽

Co Laser ◽

Specific Output ◽

Intensification Of Heat Exchange

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The influence of the charge shape on heat exchange of a recessed nozzle

Journal of Physics Conference Series ◽

10.1088/1742-6596/2057/1/012013 ◽

2021 ◽

Vol 2057 (1) ◽

pp. 012013

Author(s):

B Ya Benderskiy ◽

A A Chernova

Keyword(s):

Heat Exchange ◽

Power Plant ◽

Combustion Products ◽

Triangular Form ◽

Topological Features ◽

Exchange Processes ◽

Charge Shape ◽

Intensification Of Heat Exchange ◽

Thermally Conductive ◽

Control Volumes

Abstract The paper deals with the numerical simulation of the flow of thermally conductive viscous gaseous combustion products in the flow paths of a power plant. The influence of the shape of the mass supply surface on the gas dynamics and heat exchange near the recessed nozzle of the power plant is investigated. The coupled problem of heat exchange is solved by the method of control volumes. It is shown that the compensator geometry determines the localization of both the topological features of the flow near the recessed nozzle and the position of local maximums of the heat transfer coefficient. It has been revealed that The use of a channel with a star-shaped cross section and a triangular form of compensator rays leads to an intensification of heat exchange processes near a recessed nozzle.

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