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Wang J.-F.,The Aviation Fuel and Equipment Test Center | Meng H.-L.,The Aviation Fuel and Equipment Test Center
Zhongguo Shiyou Daxue Xuebao (Ziran Kexue Ban)/Journal of China University of Petroleum (Edition of Natural Science) | Year: 2010

Based on some reasonable simplification to the turbulent diffusion coefficient and axial velocity, an approximate analytical solution to the charge conservation equation and a formula of streaming current were derived. The formula which has a wide application scope, takes into account not only the influences of fluid velocity, oil conductivity and temperature on flow electrification, but also the influences of some non-quantitative factors such as wall roughness, oil aging and the electrochemical reaction at the interface between the solid wall and the liquid on flow electrification. It is proved with experimental data that the formula can correctly predict streaming current, thus providing a method to reliably and conveniently compute streaming electrification in oil pipe. Source


Wang J.-F.,The Aviation Fuel and Equipment Test Center | Meng H.-L.,The Aviation Fuel and Equipment Test Center
Jiliang Xuebao/Acta Metrologica Sinica | Year: 2010

Installation effects on the performance of turbine flowmeters are investigated using numerical simulation method. Results from numerical analysis show that flow disturbances caused by pipe configurations such as single bend, out-of-plane double bends and valves may produce flat, asymmetry and swirl velocity profiles, thus leading to the meter reading error. Placing bends and valves in good locations so that swirls generated as flow pass through them rotate in contrary directions is useful to reduce the swirling intensity so as to lower installation effects on flowmeter measurement accuracy. The upstream stator shows very good performance in terms of swirl, but the flatness and asymmetry relative efficiencies are not very high. Source

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