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首页> 外文期刊>Chemical Engineering Science >Non-contact electrostatic flow probes for measuring the flow rate and charge in the two-phase gas-solids flows
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Non-contact electrostatic flow probes for measuring the flow rate and charge in the two-phase gas-solids flows

机译：非接触式静电流量探头，用于测量气固两相流中的流量和电荷

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The paper presents mathematical models of a measuring system for real-time monitoring the net electric charge, the mass flow rate or concentration of charged particles, and the mean flow velocity of the particles in a pipe. The main problem lies in proper defining and establishing the unambiguous relationships between the electric parameters of a measuring system, which uses a probe, sensor or transducer based on electrostatic induction. Such devices are non-contact, non-obstructive ones and are intended for the two-phase flow metering of charged solids in pipelines. The probe's output potential (voltage) is derived as a function of an equivalent point charge representing the net charge of a charged particle column within the probe's sensing zone and flowing in a real pipe as well as a function of the net charge of this column and its dynamic space density. The relationships are established for the above three forms of charge travelling rectilinearly along or parallel to the probe's geometrical axis in a laminar or fully developed turbulent flow. The models presented here show a useful, helpful approach to the modelling of non-contact, non-intrusive measuring systems based on electrostatic induction. The substantial role the capacitance of the electrostatic flow probe itself and the whole measuring system plays in the physical process of electrostatic induction of charge and in the mathematical modelling of the probe and system is interpreted. The capacitance influence on the system bandwidth is also discussed. (c) 2005 Elsevier Ltd. All rights reserved.
机译：本文提出了一种测量系统的数学模型，用于实时监测净电荷，带电粒子的质量流率或浓度以及管道中粒子的平均流速。主要问题在于正确定义和建立测量系统电参数之间的明确关系，该测量系统使用基于静电感应的探头，传感器或换能器。这种设备是非接触式，非阻塞性​​设备，旨在用于管道中带电固体的两相流计量。探针的输出电势（电压）是根据等效点电荷得出的，该等效点电荷表示探针的感应区内并在实际管道中流动的带电粒子柱的净电荷，以及该柱净电荷的函数。它的动态空间密度。对于层流或完全展开的湍流中沿或平行于探针的几何轴直线地行进的上述三种电荷形式建立了关系。此处介绍的模型显示了一种有用的，有用的方法来对基于静电感应的非接触式，非侵入式测量系统进行建模。解释了静电流量探头本身和整个测量系统的电容在电荷的静电感应的物理过程以及探头和系统的数学建模中的重要作用。还讨论了电容对系统带宽的影响。 （c）2005 Elsevier Ltd.保留所有权利。

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