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Flow visualization in CO2 two-phase ejector in refrigeration system.

Linan Guan1,2, Zherui Chen1,2, Jingyue Sun1,2

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The Review of Scientific Instruments
|October 3, 2025
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Summary
This summary is machine-generated.

Replacing throttle valves with two-phase ejectors boosts energy recovery in transcritical CO2 refrigeration. This review details supersonic flow visualization techniques for analyzing these ejectors and their future integration.

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Area of Science:

  • Thermodynamics and Refrigeration Engineering
  • Fluid Dynamics
  • Optical Measurement Techniques

Background:

  • Transcritical CO2 refrigeration systems offer environmental benefits but face efficiency challenges.
  • Throttle valves are a key component limiting energy recovery during refrigerant expansion.
  • Two-phase ejectors present a promising alternative for enhancing energy recovery in these systems.

Purpose of the Study:

  • To comprehensively review the application of supersonic flow visualization techniques in two-phase ejectors.
  • To elucidate internal flow states and key indicators for visualization experiments.
  • To synthesize findings and evaluate visualization methods for CO2 refrigeration.

Main Methods:

  • Review of existing literature on supersonic flow visualization in two-phase ejectors.
  • Analysis of internal flow characteristics and visualization parameters.
  • Comparative evaluation of different visualization techniques and their outcomes.

Main Results:

  • Detailed explanation of internal flow states within two-phase ejectors.
  • Summary of key indicators relevant to visualization experiments.
  • Synthesis of findings from various visualization methods applied to two-phase ejectors.

Conclusions:

  • Critical evaluation of the advantages and limitations of current visualization approaches.
  • Insights into the future integration of visualization techniques in CO2 refrigeration systems.
  • Identification of opportunities for further improvement and innovation in the field.