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Measurement and modeling of void fraction for developing two-phase flow of R134a in a horizontal tube after an expansion valve.

Author(s) : YAO Y., HRNJAK P.

Type of article: IJR article

Summary

This paper applies an image analysis technique to quantify the two-phase flow videos after an expansion valve. This method first finds the liquid-vapor interface and then estimates the void fraction and velocity of each phase. This paper also proposes a one-dimensional developing two-phase flow model based on the force-momentum balance. The void fraction of the developing flow predicted by the model shows a similar trend to the quantified experiment data from image analysis: void fraction will decrease and then stabilize as flow develops along the tube. In essence, the change in void fraction and flow velocity is a result of unbalanced force in liquid and vapor phase. This model is also capable of estimating the distance to achieve fully developed flow after an expansion valve. The ability to predict two-phase flow behavior is not only important to the theoretical study of two-phase flow, but also critical to two-phase flow system design to optimize heat transfer and pressure drop.

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Pages: p. 125-137

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Details

  • Original title: Measurement and modeling of void fraction for developing two-phase flow of R134a in a horizontal tube after an expansion valve.
  • Record ID : 30032013
  • Languages: English
  • Subject: Technology
  • Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 154
  • Publication date: 2023/10
  • DOI: http://dx.doi.org/10.1016/j.ijrefrig.2023.07.009

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