Uncertainty of mass flow measurement using centric and eccentric orifice for Reynolds number in the range 10, 000 ≤ Re ≤ 20, 000. (August 2020) - Golijanek-Jędrzejczyk, Anna
Highlights: Mass flow rate measurement using a centric and eccentric orifice with diameter ratio ß = 0.5. Analysis of the impact of the flow type (for Reynolds numbers Re = 10, 000 … 20, 000) on the flow rate measurement uncertainty. Comparison of the impact of the type of orifice used on the uncertainty of flow rate measurement. Monte Carlo simulations and experiments on the laboratory stand were used. The resulting relative uncertainty of flow rate measurement does not exceed 2.1% for both orifice types. Abstract: The article analyses the impact of the Reynolds number on the estimated uncertainty of the mass flow rate measurement using an orifice plate. The objects of the research were two types of orifices: centric (ISA) and eccentric, with the diameter ratio β = 0.5. Studies were performed by Monte Carlo simulation and experiments for Reynolds numbers in the range 10, 000 ≤ Re ≤ 20, 000. The obtained results have shown that for both orifice types, the results obtained from the experiments and from the Monte Carlo simulation are similar. The nature of changes in the expanded uncertainty of the flow measurement is very similar for each type. For the both types of orifices, the value of the expanded uncertainty of the flow measurement increases linearly with the increasing Reynolds number.