Research On Measurement Methods Of Solid-phase Parameter In Fluid-solid Two-phase Flow

Liquid-solid two-phase flow has been widely applied to the field of national economics, and the relative parameters are playing a vital role in the design and operation of the equipment. At present, the measurement results on the mixed flow are limited for their low transparency, high concentration and non-uniform distribution of the solid-phase particle size. In this paper, based on the existing study, a straight pipe density meter measurement system was designed and optimized for measuring the relative parameters of liquid-solid two-phase flow. Acquiring some basic data, four representatie mixed fluids were measured. The main work and achievements are as follows:1,Made a brief introduction about the current research of two phase flow, as well as the research status and development of the parameters testing, expounding the fluid-solid two-phase flow theory and making an analysis about the related parameters index of fluid-solid two-phase flow.2,Based on the fluid mechanics, studied the movement of mixed liquid in measuring section of the straight density meter to deduce the mathematical model of the equation of the mixed fluid in the pipeline.3,According to the current problems in measuring the relative parameters of fluid-solid two-phase flow, designed, improved and assembled a straight density meter measure system to make a preliminary test.4,The water media in three schemes was tested by using straight pipe density meter measurement system. From the experiment result, it was concluded that the idealest measurement method is measuring section of pipe in inner-outer form, equipping with pressure compensation. The density is independent of time and frequency, and the error and fluctuating range can be controlled in less than 1 percent.5,Using the optimized measurement system to measure the Saline solution, gaolin solution, manganese ore pulp solution and the silt solution, it showed that the system of measuring the mixed flow could achieve good results in a short time. For a long time, the temperature of the mixed flow increased with the slurry pump constantly working that made the rubber flexible connection inflated and increased the buoyancy of tube and decreased the pressure which suffered by weighing transducer.6,The optimized experiment scheme was applied to measure the dredge industry. Comparing with the sample results measured by cobalt 60 density meter, the average density of mud is approximate to the result of straight pipe; the curve variation of the data collected by density meter is consistent with that of cobalt 60 density meter. Test results are fully satisfied with the requirement of accuracy and stability in industrial production, which is worth to apply.