Abstract
In this paper, the possibility of the flow rate measurement for a circular pipe flow by using a wo-ven screen with the property of straightening un-uniform flows is discussed. The resistance coefficient and the flow rate coefficient are estimated from the pressure difference caused by the woven screen under the experiment ranges of the wire Reynolds number, Red = 2.2 × 102-1.8 × 103, and of the open area ratio, β = 0.28-0.65. As a result, the resistance coefficient decreases and the flow rate coefficient increases as the wire Reynolds number Red or the open area ratio β increases. In addition, both coefficients are not affected by the difference between uniform and turbulent pipe flows approaching the woven screen. Therefore, the possibility of a flow-meter having the property to straighten the un-uniform flow is expected.
Highlights
It is a significant assignment to measure the flow rate exactly in engineering fields using pipe line flows
The resistance coefficient K decreases as the wire Reynolds number Red and the open area ratio β increase
In the case of the flow rate measurement using the pressure difference, the pressure difference ∆P is decided as the wall pressure drop between the front and the back of a device’s position
Summary
It is a significant assignment to measure the flow rate exactly in engineering fields using pipe line flows. A flowmeter generally requires a long runway approaching it and/or a straightening device, such as perforated plates, honeycombs or woven screens upstream of it. As for a woven screen, often used to straighten un-uniform flows such as a prejudice flow and a turbulent flow in many engineering fields [1] [2], there have been a lot of studies on resistance far [3]-[10]. The possibility as a flow-meter having the ability to straighten an un-uniform flow from the measurements of the flow rate coefficient and resistance coefficient of a woven screen for two different pipe flow fields is discussed.
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