Flow, mixing, and heat transfer in fluidic oscillators

Chirag M. Khalde, Ajinkya V. Pandit, Jitendra S. Sangwai, Vivek V. Ranade

Research output: Contribution to journalArticlepeer-review

Abstract

There is an increasing emphasis on process intensification and development of compact, intensified reactors and separators in recent years. Significant efforts are being made to develop such intensified reactors and separators without any moving parts. Some of the recent research studies have proven that a liquid-liquid extractor based on the Coanda effect and feedback oscillations exhibit excellent mixing and liquid-liquid contacting. These fluidic oscillators can potentially be used for a variety of other multiphase reactions and systems demanding enhanced mixing and heat and mass transfer. In this work, we have computationally investigated flow, mixing, and heat transfer in fluidic oscillators based on the Coanda effect. Available information on flow and mixing in fluidic oscillators was critically reviewed and key gaps in the available knowledge with respect to the design and optimization of fluidic oscillators were identified. Computational flow models were developed to characterize key flow features like unsteady flows, secondary vortices, and internal recirculation over a range of Reynolds number (Re = 90–1538) for three different oscillator designs. Systematic numerical studies were carried out to quantify different flow regimes, oscillations, and the influence of key geometric parameters on flow, mixing, and heat transfer. Simulated results were critically analyzed and are presented in the form of dimensionless numbers. The approach and results presented in this work will provide useful insights and a systematic basis for extending the applications of the Coanda-based feedback oscillatory devices for a wide range of engineering applications.

Original languageEnglish
Pages (from-to)542-559
Number of pages18
JournalThe Canadian Journal of Chemical Engineering
Volume97
Issue number2
DOIs
Publication statusPublished - 1 Feb 2019
Externally publishedYes

Keywords

  • CFD
  • Coanda effect
  • fluidic oscillators
  • heat transfer
  • mixing

Fingerprint

Dive into the research topics of 'Flow, mixing, and heat transfer in fluidic oscillators'. Together they form a unique fingerprint.

Cite this