A Flow Velocity Measurement Method Based on a PVDF Piezoelectric Sensor

Area of Science:

• Materials Science
• Fluid Dynamics
• Sensor Technology

Background:

• Accurate measurement of fluid flow velocity is crucial in various scientific and engineering applications.
• Traditional methods can sometimes interfere with the fluid's natural motion.
• Developing non-invasive flow measurement techniques is an ongoing area of research.

Purpose of the Study:

• To propose and validate a novel method for measuring fluid flow velocity.
• To utilize a polyvinylidene fluoride (PVDF) piezoelectric film sensor for non-invasive flow measurement.
• To establish the reliability and effectiveness of the proposed PVDF sensor method.

Main Methods:

• A self-made PVDF piezoelectric sensor was designed and placed parallel to the fluid flow direction.
• Theoretical analysis was performed to understand the piezoelectric characteristics of PVDF.
• Numerical simulations were conducted to verify the relationship between flow velocity and sound pressure.
• Experimental measurements were carried out to determine the relationship between flow velocity and the electrical output of the PVDF sensor.

Main Results:

• The piezoelectric properties of PVDF were theoretically characterized.
• Numerical simulations confirmed a correlation between fluid flow velocity and sound pressure.
• Experimental data demonstrated a direct relationship between fluid flow velocity and the electrical output signal from the PVDF sensor.
• The PVDF sensor effectively measured flow velocity without perturbing the fluid's motion.

Conclusions:

• The proposed method using a PVDF piezoelectric film sensor is a reliable and effective technique for measuring fluid flow velocity.
• The non-invasive nature of this method makes it suitable for applications where flow disturbance must be minimized.
• This research contributes a valuable tool for fluid dynamics studies and related fields.