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Jan Kiełbasa¹

¹Strata Mechanics Research Institute, Reymonta 27, 30-059, Kraków, Poland.

The Review of Scientific Instruments

|September 4, 2007

Summary

This study introduces a modified single-hot-wire probe capable of determining flow velocity direction. A novel third support enables voltage measurement, allowing the probe to detect flow direction with enhanced accuracy.

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Area of Science:

Fluid dynamics
Experimental fluid mechanics
Anemometry

Background:

Traditional hot-wire anemometry is widely used for measuring flow velocity.
Determining flow direction typically requires more complex multi-sensor setups.
Existing methods may have limitations in specific flow regimes or spatial resolutions.

Purpose of the Study:

To present a modified single-hot-wire probe designed for directional flow velocity detection.
To introduce a novel probe configuration enabling direct measurement of flow direction.
To validate the probe's capability in a defined coordinate system.

Main Methods:

Adaptation of a standard single-hot-wire probe by incorporating a third support.
Measurement of voltage at the central point of the hot-wire.
Analysis of the voltage difference (DeltaU) sign between wire segments to infer flow direction.

Main Results:

The sign of the voltage difference (DeltaU) directly correlates with the flow velocity direction relative to the probe.
The modified probe successfully distinguishes between opposing flow directions.
The system provides a direct measure of flow direction within its associated coordinate system.

Conclusions:

The modified single-hot-wire probe offers a straightforward method for directional flow velocity measurement.
This adaptation enhances the utility of hot-wire anemometry for complex flow analyses.
The technique provides a cost-effective and efficient solution for flow direction detection.