Summary
This paper presents the experimental study of separation of two-phase flow in a vertical header of microchannel heat exchanger based on quantified visualization using fast camera. A prototype unit, representing the real condenser has an inlet in the center of the header. Downstream of the intermediate header are two branches: lower for liquid and upper vapor flow. The header for experiment provides full visual access. R-134a is used as the fluid and mass flux through the inlet microchannels is controlled at 54?kg?m-2?s-1–193?kg?m-2?s-1. The results indicate that within the range of lower inlet quality (5–25%), good separation in that header can happen at low mass flux up to 90?kg?m-2?s-1. Results are presented in function of liquid and vapor separation efficiencies (?l, ?v). Two-phase flow characteristics inside the header are analyzed for better understanding of separation efficiencies ?l and ?v. The efficiency deteriorates dramatically when liquid reaches the vapor exit, with increasing inlet flow rate and/or quality. Better two-phase separation can be achieved by reducing the liquid upward momentum or the vapor, and decreasing liquid and vapor interaction.
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Details
- Original title: Visualization and quantification of separation of liquid-vapor two-phase flow in a vertical header at low inlet quality.
- Record ID : 30022803
- Languages: English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 85
- Publication date: 2018/01
- DOI: http://dx.doi.org/10.1016/j.ijrefrig.2017.09.018
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Investigation on the gas-liquid two-phase flow ...
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- Date : 2015/08/16
- Languages : English
- Source: Proceedings of the 24th IIR International Congress of Refrigeration: Yokohama, Japan, August 16-22, 2015.
- Formats : PDF
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Single-phase flow pressure drop of R134a vapor ...
- Author(s) : ZOU Y., HRNJAK P.
- Date : 2014/07/14
- Languages : English
- Source: 2014 Purdue Conferences. 15th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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Separation in condensers as a way to improve ef...
- Author(s) : LI J., HRNJAK P.
- Date : 2017/07
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 79
- Formats : PDF
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Two-phase flow regimes of condensing R-134a at ...
- Author(s) : VANDERPUTTEN M. A., JACOB T. A., SATTAR M., et al.
- Date : 2017/12
- Languages : English
- Source: International Journal of Refrigeration - Revue Internationale du Froid - vol. 84
- Formats : PDF
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Flow visualization of two-phase R-245fa at low ...
- Author(s) : KIM H. J., LIEBENBERG L., JACOBI A.
- Date : 2018/07/09
- Languages : English
- Source: 2018 Purdue Conferences. 17th International Refrigeration and Air-Conditioning Conference at Purdue.
- Formats : PDF
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