Enhanced liquid-gas mixing due to pulsating injection
(2015) In Computers & Fluids 107. p.196-204- Abstract
- This paper considers the effects of intermittent injection of a liquid jet or spray on the initial break-up and mixing of one fluid with the surrounding ambient fluid. The aim of the analysis is to describe the physical process and indicate the mechanisms that control the mixing under different flow conditions (time-dependent injection and its frequency relative to the time scales of the flow) and fluid properties (density ratio), Schmidt number for a single phase case which is studied for comparison, or the Weber number for the two-phase cases. The computations use Large Eddy Simulation (LES) to account for turbulence, and either Volume Of Fluid (VOF) for the initial break-up or Lagrangian Particle Tracking (LPT) with droplet break-up... (More)
- This paper considers the effects of intermittent injection of a liquid jet or spray on the initial break-up and mixing of one fluid with the surrounding ambient fluid. The aim of the analysis is to describe the physical process and indicate the mechanisms that control the mixing under different flow conditions (time-dependent injection and its frequency relative to the time scales of the flow) and fluid properties (density ratio), Schmidt number for a single phase case which is studied for comparison, or the Weber number for the two-phase cases. The computations use Large Eddy Simulation (LES) to account for turbulence, and either Volume Of Fluid (VOF) for the initial break-up or Lagrangian Particle Tracking (LPT) with droplet break-up model in the case of liquid droplets injected into the ambient gas. The results show that, depending on the physical properties of the liquid and ambient gas, the initial break-up and turbulent mixing can be enhanced substantially with intermittent injection. The numerical modeling is validated by recovering key results of experimental and analytical works. It can be observed that a main effect during the mixing is the suction of ambient fluid at the tail of the injected liquid, which depends on the fluid properties. Increased injection frequency shows to increase the mixing significantly during the initial transient phase. (C) 2014 The Authors. Published by Elsevier Ltd. (Less)
Please use this url to cite or link to this publication:
https://lup.lub.lu.se/record/5187317
- author
- Grosshans, Holger LU ; Szász, Robert-Zoltán LU and Fuchs, Laszlo LU
- organization
- publishing date
- 2015
- type
- Contribution to journal
- publication status
- published
- subject
- keywords
- Pulsed injection, Air entrainment, Mixing, Jets, Sprays
- in
- Computers & Fluids
- volume
- 107
- pages
- 196 - 204
- publisher
- Elsevier
- external identifiers
-
- wos:000348746400015
- scopus:84913553775
- ISSN
- 0045-7930
- DOI
- 10.1016/j.compfluid.2014.11.009
- language
- English
- LU publication?
- yes
- id
- 7061aaf7-ed9c-437a-aa06-2a4d6216e7d4 (old id 5187317)
- date added to LUP
- 2016-04-01 14:59:24
- date last changed
- 2022-03-29 23:48:07
@article{7061aaf7-ed9c-437a-aa06-2a4d6216e7d4,
abstract = {{This paper considers the effects of intermittent injection of a liquid jet or spray on the initial break-up and mixing of one fluid with the surrounding ambient fluid. The aim of the analysis is to describe the physical process and indicate the mechanisms that control the mixing under different flow conditions (time-dependent injection and its frequency relative to the time scales of the flow) and fluid properties (density ratio), Schmidt number for a single phase case which is studied for comparison, or the Weber number for the two-phase cases. The computations use Large Eddy Simulation (LES) to account for turbulence, and either Volume Of Fluid (VOF) for the initial break-up or Lagrangian Particle Tracking (LPT) with droplet break-up model in the case of liquid droplets injected into the ambient gas. The results show that, depending on the physical properties of the liquid and ambient gas, the initial break-up and turbulent mixing can be enhanced substantially with intermittent injection. The numerical modeling is validated by recovering key results of experimental and analytical works. It can be observed that a main effect during the mixing is the suction of ambient fluid at the tail of the injected liquid, which depends on the fluid properties. Increased injection frequency shows to increase the mixing significantly during the initial transient phase. (C) 2014 The Authors. Published by Elsevier Ltd.}},
author = {{Grosshans, Holger and Szász, Robert-Zoltán and Fuchs, Laszlo}},
issn = {{0045-7930}},
keywords = {{Pulsed injection; Air entrainment; Mixing; Jets; Sprays}},
language = {{eng}},
pages = {{196--204}},
publisher = {{Elsevier}},
series = {{Computers & Fluids}},
title = {{Enhanced liquid-gas mixing due to pulsating injection}},
url = {{http://dx.doi.org/10.1016/j.compfluid.2014.11.009}},
doi = {{10.1016/j.compfluid.2014.11.009}},
volume = {{107}},
year = {{2015}},
}