Experimental study of a fractal flowmeter in a pipe
Flow measurement is a critical issue when it comes to determine the amount of uid purchased and sold, especially for oil, gas and water supply companies. An accurate ow measurement is essential both in lab experiments and in many engineering applications such as power and chemical plant and uid engineering systems. There are many owmeters available on the market. A popular and robust method relates the uid mass ow rate to a pressure drop. This kind of differential pressure owmeters accounts for about 50％ of all owmeters used in industry and the next most common owmeter is used for less than 15％ of ow measurements. The simplest version of such a owmeter is an orifice plate. The pressure drop across the plate is measured and the relationship between the pressure difference and the mass ow rate can be established by using uid mechanics theory corrected and calibrated with experiments. Precise guidelines to calculate ow rate by using pressure difference are set out in International Standards (ISO 5167 1, 2). For this type of owmeter to work properly, a homogenous, fully developed ow must be established before and after the orifice plate. For practical reasons however, the upstream and downstream distances must be kept at a minimum. To improve the robustness in this study, we propose replacing the classic owmeter with a single circular hole with one using a fractal pattern. A series of experiment are employed to measure the effect of the fractal on the ow and how long it takes for the ow to return to a homogeneous isotropic steady state.
fractal grips owmeter turbulence hot-wire anemometry
C.H.A.Chong S.B.M.Beck F.C.G.A.Nicolleau
The University of Sheffield, Department of Mechanical Engineering, Mappin Street, S1 3JD, Sheffield,United Kingdom
国际会议
The Fifth International Conference on Fluid Mechanics(第五届国际流体力学会议)
上海
英文
2007-08-15（万方平台首次上网日期，不代表论文的发表时间）