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Measurement of Fluid Pressure01:16

Measurement of Fluid Pressure

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Fluid pressure is commonly measured using devices called manometers, which rely on liquid columns to indicate pressure differences. The height of a liquid column in a manometer reflects the pressure exerted by the fluid, providing a simple yet effective means of measurement. Different types of manometers serve specific purposes based on their configurations and the type of fluids involved.
A basic form of manometer is the piezometer, a vertical tube open at the top and filled with the same...
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Development of a Flexible MEMS Sensor for Subsonic Flow.

Koichi Murakami1, Daiki Shiraishi1, Shunsuke Mizumi2

  • 1Department of Mechanical Engineering, Graduate School of Engineering, Tokyo University of Science, Tokyo 125-8585, Japan.

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|August 26, 2022
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Summary
This summary is machine-generated.

A new flexible microelectromechanical systems (MEMS) sensor accurately measures wall shear stress and flow angle in subsonic airflow, crucial for enhancing fluid machinery efficiency.

Keywords:
MEMS flow sensorflow directionflow ratehot-filmsubsonic flow

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Area of Science:

  • Fluid Dynamics
  • Aerodynamics
  • Sensor Technology

Background:

  • Flow separation significantly impacts fluid machinery efficiency.
  • Accurate measurement of wall shear stress and flow angle is vital for flow control.

Purpose of the Study:

  • To develop and validate a flexible microelectromechanical systems (MEMS) sensor for measuring wall shear stress and flow angle in subsonic airflow.
  • To assess the sensor's performance across a range of velocities.

Main Methods:

  • Fabrication of a flexible sensor using polyimide film with a microheater and temperature sensor pairs.
  • Utilizing numerical simulations to optimize sensor design.
  • Experimental validation in a wind tunnel (30-170 m/s, Mach 0.1-0.5).

Main Results:

  • Sensor measures wall shear stress via heater output, showing a power-law relationship (output ∝ τ^(1/3)).
  • Flow angle is determined from temperature gradients, exhibiting sinusoidal variation with angle.
  • Successful measurement of both parameters across the tested subsonic velocity range.

Conclusions:

  • The developed MEMS sensor is effective for simultaneous measurement of wall shear stress and flow direction in subsonic flows.
  • This technology offers potential for improved flow control and efficiency in fluid machinery.