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Summary Report of Nist's Industry-Government Consortium Research Program on Flowmeter Installation Effects

Excerpt from Summary Report of Nist's Industry-Government Consortium Research Program on Flowmeter Installation Effects: The 45 Degree Elbow In the present study, the uid is water and the piping is mm (2 in diameter), smooth, stainless steel. Water temperature is controlled using a heat exchanger to maintain a set temperature of zi c. The relative roughness of this pipe has been measured with a profilometer to indicate a value of based on interior pipe diameter. Diametral Reynolds numbers range from 104 to 105 usrng bulk average velocity. According to the concepts of dynamic similitude, the results of the present research program should predict a range of other ows both liquids and gases in geometrically scaled piping configurations when pertinent parameters match those in our experiments. The pertinent parameters considered important in the current experiments are Reynolds numbers, and pipe relative roughness. All pertinent reference conditions regarding pipe ows are completely documented according to basic uid ow principles. When all these conditions occur in other, geometrically scaled pipe systems, in liquids or gases, the ows should be appropriately scaled versions of our results. It is suggested here that both owmeter manufacturers and users can also use this approach to achieve improved performance for meters that are different from the orifice and turbine meter geometries used in this program. They can, for example, duplicate the piping geometry and Reynolds number conditions that have been investigated at nist and use dimensional similitude concepts to conclude that similar ow phenomena prevail in the duplicate system. In this way, the time and expense needed to conduct duplicate LDV surveys can be saved. When meter performance is then produced in these non-ideal installation conditions, analogous prediction schemes can be produced for the respective meters. As in the nist program, the success of the prediction scheme can be tested in laboratory tests. In this way, the nist LDV results can be used simultaneously by numerous investigators for their benefit and for performance standards that are critically needed. About the Publisher Forgotten Books publishes hundreds of thousands of rare and classic books. Find more at This book is a reproduction of an important historical work. Forgotten Books uses state-of-the-art technology to digitally reconstruct the work, preserving the original format whilst repairing imperfections present in the aged copy. In rare cases, an imperfection in the original, such as a blemish or missing page, may be replicated in our edition. We do, however, repair the vast majority of imperfections successfully; any imperfections that remain are intentionally left to preserve the state of such historical works."
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