2014-11-07 
Lithuanian Energy Institute (202 a. Breslaujos st. 3, Kaunas, Lithuania) Author, Institution: Eugenijus Maslauskas, Lietuvos energetikos institutas
Dissertation title: Investigation of flow regime and physical properties influence on liquid and gas mechanical flow meters‘ characteristics
Science area, field of science: Technological Sciences, Energetics and Power Engineering – 06T
Defense of the dissertation: 2014-11-07, 10:00, Lithuanian Energy Institute (Meeting Hall – AK-202 a.), Breslaujos st. 3, Kaunas, Lithuania.
Scientific Supervisor: – Dr. Habil. Antanas PEDIŠIUS (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering – 06T)
Dissertation Defense Board of Energetics and Power Engineering Science Field:
- Chairman – Prof. Dr. Habil. Stasys ŠINKŪNAS (Kaunas University of Technology, Technological Sciences, Energetics and Power Engineering – 06T);
- Prof. Dr. Habil. Juozas AUGUTIS (Vytautas Magnus University, Technological Sciences, Energetics and Power Engineering – 06T);
- Dr. Raimondas PABARČIUS (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering – 06T);
- Prof. Dr. Gvidonas LABECKAS (Aleksandras Stulginskis University, Technological Sciences, Energetics and Power Engineering – 06T);
- Prof. Dr. Habil. Eugenijus UŠPURAS (Lithuanian Energy Institute, Technological Sciences, Energetics and Power Engineering – 06T).
Official Opponents:
- Prof. Dr. Habil. Stasys Vygantas AUGUTIS (Kaunas University of Technology, Technological Sciences, Measurement Engineering – 10T);
- Prof. Dr. Habil. Vytautas MARTINAITIS (Vilnius Gediminas Technical University, Technological Sciences, Energetics and Power Engineering – 06T).
The doctoral dissertation is available at the libraries of Kaunas University of Technology (K. Donelaičio st. 20, Kaunas) and Lithuanian Energy Institute (Breslaujos st. 3, Kaunas).
Annotation:
Mechanical meters (turbine, positive displacement, Coriolis) are especially important in liquid and gas measurement due to their accuracy and reliability. The main disadvantage of these meters is their great sensitivity to liquid and gas flow regime and to the change of their physical properties, which are determined by type, temperature and pressure of liquid and gas. Complex and expensive procedures and equipment are necessary to determine and ensure stable characteristic of such meters. Thus, it is especially relevant to investigate and determine general regularities of measurement characteristics of such meters during variation of flow regime and physical properties of flows as such regularities would provide a possibility to summarise and forecast measurement results and simplify procedures to ensure qualitative measurement characteristics.
The determined physical causes for error variance of mechanical meters can be applied in practice to foresee:
• variances of gas flow rate measurement errors of turbine meters under increased pressure when error variance nature is known under atmospheric pressure and, furthermore, reasonably consider the purpose to apply calibration to turbine meters fitted in pipelines under working pressures and natural gas;
• variances of liquid flow rate measurement errors of positive displacement meters, when results of errors measurement in one liquid are known.
It is also determined, that by measuring of mass flow with Coriolis flowmeters, the errors’ shift toward negative values, when viscosity increases or Re decreases, depends on the formation and intensification of secondary flows. Errors’ shift toward positive values is determined by weakening of the secondary flows, when viscosity further increases.