Boiling flow patterns and dry-out characteristics of R-1234ze(E) in a plate heat exchanger

Dong Chan Lee, Chang Uk Jo, Byeongsu Kim, Yongchan Kim

Research output: Contribution to journalArticlepeer-review

Abstract

In this study, boiling flow patterns and dry-out characteristics of R-1234ze(E) in a plate heat exchanger (PHE) are investigated through visualizations and surface temperature measurements. The boiling flow patterns in the PHE are classified into three regimes by reflecting an evident flow direction and intermittent flooding (IF): rough liquid film flow, pulsating annular flow, and steady annular flow. Boiling mechanisms in the liquid-preferred and vapor-preferred paths are analyzed in a single channel. A boiling flow pattern map of R-1234ze(E) in the PHE is developed in terms of liquid and vapor superficial momentums, and the criteria for the transitions of the flow regimes are proposed to provide a reference for predicting flow characteristics during phase changes. Based on the measured surface temperatures, the partial dry-out is observed at medium to high vapor qualities in the center of the vapor-preferred path owing to the lack of the liquid phase. In addition, the relationships between the IF, partial dry-out, and heat transfer coefficients are comprehensively analyzed with physical interpretations.

Original languageEnglish
Article number120308
JournalInternational Journal of Heat and Mass Transfer
Volume161
DOIs
Publication statusPublished - 2020 Nov

Keywords

  • Dry-out
  • Flow pattern
  • Flow visualization
  • Low gwp
  • Plate heat exchanger

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Mechanical Engineering
  • Fluid Flow and Transfer Processes

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