Influence of properties of river soils on river bed movement

• Main Authors: Volgina Lyudmila Vsevolodovna, Tarasov Vsevolod Konstantinovich, Zommer Tatyana Valentinovna
• Format: Article
• Language: English
• Published: Moscow State University of Civil Engineering (MGSU) 2012-10-01
• Series: Vestnik MGSU
• Subjects: Chezy coefficient; solid particle; two-phase flow; open channel; hydraulic transport; slope; critical velocity
• Online Access: http://vestnikmgsu.ru/files/archive/issues/2012/9/ru/12.pdf

The authors consider the problem of conveyance of non-spherical solid particles in an open rectangular channel. The process of glass container manufacturing is accompanied by formation of waste glass at 1150...1350 °С. As a result, hot glass mass flows into cold water and transforms into glass granules. Granules are used in the production of glass, and they can be loaded back into the industrial furnace. At this stage, there arises a problem of conveyance of waste glass granules into the gallery, in the direction of the furnace. The pipeline-based method requires an engine, which will increase the cost of glass containers. Hydraulic transportation of waste glass is a cheaper method. In this connection, there is a practical problem of identifying the slope angle sufficient for the transportation of waste glass in an open rectangular channel. Thus, we must determine the hydraulic characteristics of the two-phase flow to solve the problem. A laboratory research of the particle size distribution pattern was conducted in 2011 at the glass factory in operation in the Tula region. The shape of particles and the condition of the glass surface affect the parameters of their hydraulic transportation. These characteristics are taken into account when calculating the formula and introducing the correction coefficient. The problem of determining the slope of the open channel needed to transport waste glass into the glass melting furnace can be formulated as follows. What should be the angle of the bottom of the channel for hydraulic transport of waste glass, when the particle speed reaches its critical value? The input data are as follows: channel length - 70 meters, cross-section area - 1.4 m2. Hydraulic transport of waste glass is produced under the influence of gravity, due to the difference in the height of the upper and lower points of transportation. Chezy coefficient helps determine the appropriate slope of the bottom of the channel. As a result of the calculation of the angle of inclination of the bottom of the channel, the difference between the upper and lower points was 2.17 m, the particle size of glass 4.76...17.97 mm, the channel length - 70 m, height - 1 m, width - 1.4 m. The benefits of free flow hydraulic transport include small operating costs. The main disadvantage of hydraulic transport is the need for a substantial difference in the heights of upper and lower points. As a result, the authors have worked out their recommendations concerning the transportation of y solid particles of waste glass.