Dynamic Gravitational Standard for Liquid Flow: Model and Measurements

Published

August 14, 2009

Author(s)

Iosif I. Shinder, Michael R. Moldover

Abstract

We report progress in testing a dynamic gravimetric standard using both steady and unsteady water flows. For steady flows in the range 10 kg/s to 60 kg/s, the difference between the dynamic standard and NIST s static primary standard was 0.015 % with a standard deviation of 0.033 %, To measure unsteady flows, we calibrated a rapidly-responding electromagnetic flow meter (EMF) using NIST s static standard and we measured the time delay between the response of the EMF and the dynamic standard. We also verified that the response time of the weigh scale was sufficiently insensitive to the load on it. For testing, the unsteady flows averaged 12 kg/s; however, these flows were either ramped or pulsed up (or down) by 5 kg/s. When integrated over the collection interval, the difference between the dynamic standard and the EMF was 0.008 % with a standard deviation of 0.012 %. This excellent agreement supports our model for the dynamic standard and justifies the further study of the dynamic standard, particularly at higher flows where the mechanical simplicity of a dynamic standard might reduce the cost of accurate measurements.

Proceedings Title

Annual International Symposium on Fluid Flow Measurement | 7th | | CEESI

Conference Dates

August 12-14, 2009

Conference Location

Anchorage, AK

Pub Type

Conferences

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Keywords

fluid flow, primary standards, dynamic standard

Citation

Shinder, I. and Moldover, M. (2009), Dynamic Gravitational Standard for Liquid Flow: Model and Measurements, Annual International Symposium on Fluid Flow Measurement | 7th | | CEESI, Anchorage, AK, [online], https://tsapps.nist.gov/publication/get_pdf.cfm?pub_id=903358 (Accessed December 14, 2024)