Experimental research of microturbulence and transportability on sliding surfaces

21st International Scientific Conference on Advanced in Civil Engineering "Construction - The Formation of Living Environment"

土木建筑工程

Orlov, Vladimir^1 ; Dezhina, Irina^1

Moscow State University of Civil Engineering, Yaroslavskoe Shosse 26, Moscow

129337, Russia^1

关键词: Experimental research;    Flow charac-teristics;    Hydraulic parameters;    Pipeline transport;    Rectangular cross-sections;    Roughness structures;    Transport capacity;    Vortex configurations;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/365/4/042048/pdf
DOI  :  10.1088/1757-899X/365/4/042048

学科分类：土木及结构工程学

来源: IOP

【 摘 要 】

The possibility of increasing the pipeline transport capacity was analyzed with the points of the development of the pipeline inner surface roughness. An effective consequences of the pipeline inner surface roughness modification were observed. The positive effects and essential needs of the research progress in this area were noticed. The method of carrying out experiments for investigation of the flow transport capacity development in the open chute with the different roughness structure were introduced. Changing the geometric shape of the internal surface of the pipe by placing artificial protrusions (obstacles) creates the flow vortex formation (micro-turbulence). A testing bench for investigation of turbulence and carrying capacity of flow of fluid by optical means in the open pipe with the different location of their internal protrusions were used. The bench includes a working surface in the form of open chute; a water container. The flow characteristics, hydraulic parameters (design water stream, speed, filling, slope, etc.), were accompanied on the bench by filming and continuous -shadow multi-frame photography using a light effect to reflect the vortex configurations and backwater in the frontal parts of obstacles. The transport capacity was checked by ability of transportation for sand mineral impurities groups. As an obstacle of a fluid flow, various configurations of obstacles created a microturbulence. The obstacles are made in the form of barriers of short objects of rectangular cross-section, located at different angles to each other, uniformly distributed along the length of the tray. Based on the conducted researches, the optimal type and parameters of obstacles for an improvement of the transport capacity are established.