Development of absolute hot-wire anemometry by the 3omega method

Area of Science:

• Fluid Dynamics and Heat Transfer
• Measurement Science and Instrumentation

Background:

• Traditional hot-wire anemometry relies on constant current principles for fluid flow measurement.
• Understanding heat transfer dynamics is crucial for accurate flow rate determination in gases.

Purpose of the Study:

• To develop and validate a novel hot-wire anemometry technique using the 3omega method.
• To measure the conductive-convective exchange coefficient and gas flow rate.
• To compare experimental results with numerical simulations for validation.

Main Methods:

• Application of the 3omega method with sinusoidal current instead of constant current.
• Utilizing synchronous detection to measure heat transfer coefficients.
• Experimental testing with air flow at 300 K and atmospheric pressure.

Main Results:

• Experimental results align with numerical simulations, confirming the theoretical model.
• The 3omega method effectively measures gas flow rate.
• The conductive-convective exchange coefficient was accurately determined.

Conclusions:

• The 3omega method is a viable and effective alternative for hot-wire anemometry.
• The study validates the technical choices and approximations within the 3omega method.
• This technique enhances the measurement of gas flow rate and heat transfer.