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Measurement of Fluid Pressure

Measurement of Fluid Pressure

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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Updated: May 16, 2026

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

Published on: January 28, 2022

Note: precision viscosity measurement using suspended microchannel resonators.

I Lee¹, K Park, J Lee

¹Department of Mechanical Engineering, Sogang University, Seoul 121-742, South Korea.

The Review of Scientific Instruments

|December 5, 2012

Summary

This summary is machine-generated.

This study characterizes a suspended microchannel resonator (SMR) for precise, low-viscosity fluid measurements. The SMR offers high-resolution viscosity determination and enables real-time monitoring, proving effective without density correction.

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Assembly and Characterization of an External Driver for the Generation of Sub-Kilohertz Oscillatory Flow in Microchannels

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Published on: January 28, 2022

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Thermal Measurement Techniques in Analytical Microfluidic Devices

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Published on: June 3, 2015

Area of Science:

Physics
Materials Science
Chemical Engineering

Background:

Accurate viscosity measurement is crucial for fluid characterization.
Existing methods may lack precision or real-time capabilities in low-viscosity regimes.
Suspended microchannel resonators (SMRs) offer potential for microfluidic sensing applications.

Purpose of the Study:

To characterize a suspended microchannel resonator (SMR) for viscosity measurements.
To evaluate two distinct measurement schemes: Q-factor and vibration amplitude monitoring.
To assess the SMR's ability to measure dynamic viscosity without density correction.

Main Methods:

Characterization of SMR quality factor (Q-factor) using glycerol-water mixtures.
Vibration amplitude monitoring of the SMR under closed-loop feedback control.
Comparison of measurement time and viscosity resolution between the two schemes.

Main Results:

The Q-factor measurement exhibited bilinear sensitivity (1281 and 355 (mPa s)(-1)) in the 1-8 mPa s range.
Amplitude-based measurements were significantly faster (0.1–1 ms) than Q-factor measurements (~30 s).
Q-factor measurements provided at least three times better viscosity resolution than amplitude-based measurements.

Conclusions:

The SMR accurately measures dynamic viscosity without requiring density correction.
High-precision viscosity measurements are achievable with the SMR.
The amplitude-based scheme allows for real-time viscosity change monitoring.