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Area of Science:

  • Thermophysics
  • Phase Transition Dynamics
  • Advanced Sensor Technology

Background:

  • Tracking dynamic phase fronts is crucial in various scientific and engineering fields.
  • Traditional methods may lack precision or real-time capabilities for certain applications.
  • The electrothermal 3ω method offers potential for non-invasive thermal property measurements.

Purpose of the Study:

  • To develop and demonstrate a novel electrothermal 3ω technique for tracking moving phase fronts.
  • To accurately determine the location of the phase boundary between air and dielectric oil.
  • To evaluate the precision and applicability of a multifrequency 3ω sensor for this purpose.

Main Methods:

  • Utilized a fine wire 3ω sensor (10 µm diameter, 30 mm length) suspended in dielectric oil.
  • Simultaneously excited the sensor at four different frequencies to enhance thermal information acquisition.
  • Compared 3ω-derived phase boundary locations with direct camera imaging for validation.

Main Results:

  • The electrothermal 3ω method successfully tracked the oil-air phase front.
  • For quasistatic conditions, the technique achieved an average root mean square error under 18 µm.
  • Accuracy was validated for phase front distances ranging from 12 µm to 360 µm.

Conclusions:

  • The developed multifrequency electrothermal 3ω method provides a highly accurate approach for tracking moving phase fronts.
  • This technique demonstrates significant potential for precise measurements in fluid interfaces and thermal studies.
  • Considerations for multifrequency measurements, such as frequency crosstalk, were analyzed.