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PRESSURE GRADIENT ALONG PIPELINE IN hydrotransport

International Journal of Sediment Research 1991年第1期 83-98页

作者： SONG Tiancheng and WAN Zhaohui Research engineer. Institute of Water Conservancy and Hydroelectric Power Research (IWHR) Senior engineer (IWHR)

The head loss along pipeline in hydrotransport has been studied through a set of well arranged experiments. For pseudo one-phase now with fully mixed sediment particles, a modified Reynolds number Re1 consisting of yield stress τB and rigidity η of the Bingham fluid and other hydraulic parameters is adopted, the relationship between Re1 and friction factor λ is the same as that of clear water. For two-phase flow when all particles are fully suspended, the head loss is the same as that of pseudo one-phase flow. If coarse particles move as bed load, extra resistance will occur. The critical condition under which the extra flow resistance appears has been found. Two types of theoretically deduced resistance curves agree well with the experimental results. It can be deduced that the pressure gradient is proportional to D-1 to D-1.25, depending on the rheological properties of suspension and the flow velocity. Drag reduction may take place only in two-phase flow with bed load movement. Adding fine particles weakens bed load movement, consequently, head loss reduces.

关键词： Pseudo one-phase flow. Two-phase flow Bingham fluid Yield stress hydrotransport Bed load movement Suspension Pressure gradient

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A METHOD FOR MEASUREMENT OF GAS CONTENT IN SLURRY PIPELINE

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Journal of Hydrodynamics 2006年第1期18卷 77-81页

作者： YANG Lin College of Mechanical and Electrical Engineering Chongqing Jiaotong University Chongqing 400074China

Most commercial slurries in hydrotransport pipelines usually contain some gas which can considerably degrade the pump performance, but this small amount of gas content can not be measured accurately online or continually using conventional methods. Based on analysis of effects of. gas on pressure wave speed in slurries, an investigation was carried out to validate the feasibility of the method to deter.. mine gas content in slurries using sound speed. Moreover, its practical measuring methods were also discussed. It was found that the non invasive measurement of the sound level noise spectrum across the pipeline should be a promising online measuring method of the slurry gas content.

关键词： hydrotransport slurry wave speed gas,measurement

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