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Flow condensation pressure oscillations at different orientations.

Lucas E O'Neill1, Issam Mudawar1, Mohammad M Hasan2

  • 1Purdue University Boiling and Two-Phase Flow Laboratory (PU-BTPFL), School of Mechanical Engineering, Purdue University, 585 Purdue Mall, West Lafayette, IN 47907, USA.

International Journal of Heat and Mass Transfer
|February 2, 2019
PubMed
Summary
This summary is machine-generated.

Flow condensation of FC-72 exhibits oscillatory behavior, particularly in vertical upflow. While present, these pressure oscillations are generally low amplitude, posing minimal safety risk in cooling applications.

Keywords:
Flow condensationFlow instabilitiesFrequency and amplitudePressure oscillations

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Area of Science:

  • Thermodynamics
  • Fluid Dynamics
  • Heat Transfer

Background:

  • Traditionally, two-phase flow instabilities focus on boiling flows due to safety concerns.
  • Condensing systems also exhibit oscillatory phenomena impacting precise system control.
  • Understanding these instabilities is crucial for optimizing system performance.

Purpose of the Study:

  • Investigate oscillatory behavior during FC-72 flow condensation.
  • Analyze pressure signals across different flow orientations (vertical upflow, downflow, horizontal).
  • Correlate observed oscillations with physical characteristics of condensate film.

Main Methods:

  • Conducted experiments on FC-72 flow condensation in a smooth circular tube.
  • Measured pressure signals to identify oscillatory phenomena.
  • Utilized flow visualization to observe condensate film behavior.
  • Analyzed frequency response peaks and calculated Q Factor for oscillation intensity.

Main Results:

  • Oscillatory behavior was detected in 72% of vertical upflow, 61% of vertical downflow, and 54% of horizontal flow cases.
  • Vertical upflow demonstrated the most significant oscillatory behavior.
  • Maximum oscillation amplitude was 7.9% of the time-averaged inlet pressure, indicating low risk.
  • Flow visualization revealed correlations between condensate film behavior and pressure oscillations.

Conclusions:

  • Flow condensation instabilities are present across various orientations.
  • Vertical upflow shows the highest propensity for oscillations.
  • Observed oscillations do not pose a significant safety risk under tested conditions.
  • Condensate film dynamics play a key role in flow instabilities during condensation.