Computational fluid dynamic modeling of liquid-gas flow patterns and hydraulics in the cross-corrugated channel of a plate heat exchanger

Xiaowei Zhu*, Fredrik Haglind

*Corresponding author for this work

Research output: Contribution to journalJournal articleResearchpeer-review

81 Downloads (Pure)

Abstract

The morphology of liquid-gas flows in corrugated plate heat exchangers is complex due to the intricate channel geometry. To date, only a few experimental visualizations have been performed to study the two-phase flow characteristics in plate heat exchangers. In this paper, we perform pioneering computational fluid dynamics simulations of the adiabatic liquid-gas (water-air) flow in a cross-corrugated channel of a plate heat exchanger. The standard volume-of-fluid technique is used to capture the complex phase-interfaces constructed by the cross-corrugated walls. In order to reduce the computational cost, the computational domain is simplified by a series of assumptions. The bubbly flow, slug flow, churn flow and film flow are modeled by varying the superficial velocities of both phases, and the validity of these patterns is proved by comparison with experimental results. A flow regime map is developed based on the numerical results, and the transitions between the regimes are discussed. The predicted pressure drop shows good agreement with the experimental data as well. The two-phase multiplier for general prediction of the friction factor in the cross-corrugated channel is calibrated. The mean void fraction in the channel is quantified by the numerical simulation. The void fraction model from Zuber and Findlay is found to be applicable to the cross-corrugated channel, which is further modified for general use for these types of channel flows.
Original languageEnglish
Article number103163
JournalInternational Journal of Multiphase Flow
Volume122
Number of pages11
ISSN0301-9322
DOIs
Publication statusPublished - 2020

Keywords

  • Plate heat exchanger
  • Cross-corrugated channel
  • Two-phase
  • Computational fluid dynamics
  • Flow pattern

Fingerprint Dive into the research topics of 'Computational fluid dynamic modeling of liquid-gas flow patterns and hydraulics in the cross-corrugated channel of a plate heat exchanger'. Together they form a unique fingerprint.

Cite this