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Cylindrical orifice testing in laminar flow with the orifice diameter ratio β = 0.5
Anna Golijanek-Jędrzejczyk1, Andrzej Mrowiec2
1Faculty of Electrical and Control Engineering, Gdańsk University of Technology, 80-233, Gdansk, Poland. anna.golijanek-jedrzejczyk@pg.edu.pl.
Scientific Reports
|September 18, 2023
Summary
This study determined the average discharge coefficient for hydraulic oil flowing through a specific cylindrical orifice (β=0.5, L/d=1) in a laminar flow regime (Re=100-950). Results provide key flow characteristics for engineering applications.
Area of Science:
- Fluid Mechanics
- Experimental Engineering
- Hydraulic Systems
Background:
- Orifice flow characteristics are crucial for fluid dynamics and hydraulic system design.
- Understanding flow behavior in specific geometries, like cylindrical orifices, is essential for accurate metering and control.
- Laminar flow regimes require precise characterization due to viscous effects dominating inertial forces.
Purpose of the Study:
- To experimentally determine the discharge coefficient (C) for a cylindrical orifice.
- To analyze the flow characteristics of hydraulic oil under laminar conditions.
- To establish flow data for a specific orifice geometry (β=0.5, L/d=1) and flow rates.
Main Methods:
- Experimental measurements of hydraulic oil flow in a DN50 channel.
- Flow characterization within a laminar regime, specifically for Reynolds numbers (Re) from 100 to 950.
- Determination of average discharge coefficient (C) across varying kinematic viscosity values (13.4-33.3 cSt) and flow rates (qv < 0.5 dm3/s).
Main Results:
- Standard flow characteristics were established for four different kinematic viscosity values.
- The average discharge coefficient (C) was determined for the tested range of laminar flow conditions.
- Experimental data provides a basis for calibrating and validating flow models for this orifice configuration.
Conclusions:
- The study successfully characterized hydraulic oil flow through a cylindrical orifice in the laminar regime.
- The determined discharge coefficients offer valuable data for applications involving similar orifice geometries and flow conditions.
- Experimental findings contribute to a better understanding of flow metering accuracy in hydraulic systems.
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