Experimental investigation of a turbulent particle-laden flow inside a cubical differentially heated cavity

Jarmo Kalilainen (Corresponding Author), Pekka Rantanen, Terttaliisa M. Lind, Ari S. J. Auvinen, Abdel Dehbi

Research output: Contribution to journalArticleScientificpeer-review

7 Citations (Scopus)

Abstract

The depletion dynamics of 1 µm and 2.5 µm SiO2 aerosol particles inside a differentially heated cavity was investigated experimentally using a cubical DIANA cavity with two opposing isothermal vertical walls and adiabatic top, bottom, front and back walls. The top, front and back walls are made of glass to allow optical access for different laser devices. The cavity atmosphere consisted of air and the isothermal wall temperatures were set to approximately 330.6 K and 291.3 K. The Rayleigh number of the flow was approximately 109, indicating turbulent conditions. The particle deposition rates were investigated by measuring the intensity of the reflected light from the particles and by using tapered element oscillating microbalance to measure the change in airborne particle mass concentration. The flow field in the mid-plane joining the isothermal walls was investigated using particle image velocimetry. Gas temperature measurements were collected using K-type thermocouple. The flow field and temperature measurements described turbulent flow near the isothermal and horizontal walls encircling the cavity stagnant core region with a stratified temperature distribution. Measurements indicated that the particle concentration at any time was approximately uniform throughout the cavity atmosphere. The measured depletion rate were compared to the theoretical "stirred settling" model predictions. While the decay rate of 2.5 µm particles was close to that predicted by the theoretical "stirred settling" model, it was found that 1 µm particles deposited two times faster than the theory predicted.
Original languageEnglish
Pages (from-to)73-87
JournalJournal of Aerosol Science
Volume100
DOIs
Publication statusPublished - 2016
MoE publication typeA1 Journal article-refereed

Fingerprint

Temperature measurement
Flow fields
cavity
Gas fuel measurement
Thermocouples
Aerosols
Deposition rates
Joining
Velocity measurement
Particles (particulate matter)
Turbulent flow
Temperature distribution
Glass
flow field
Lasers
Air
temperature
Rayleigh number
atmosphere
turbulent flow

Keywords

  • deposition
  • enclosure
  • experiment
  • natural convection

Cite this

Kalilainen, Jarmo ; Rantanen, Pekka ; Lind, Terttaliisa M. ; Auvinen, Ari S. J. ; Dehbi, Abdel. / Experimental investigation of a turbulent particle-laden flow inside a cubical differentially heated cavity. In: Journal of Aerosol Science. 2016 ; Vol. 100. pp. 73-87.
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abstract = "The depletion dynamics of 1 µm and 2.5 µm SiO2 aerosol particles inside a differentially heated cavity was investigated experimentally using a cubical DIANA cavity with two opposing isothermal vertical walls and adiabatic top, bottom, front and back walls. The top, front and back walls are made of glass to allow optical access for different laser devices. The cavity atmosphere consisted of air and the isothermal wall temperatures were set to approximately 330.6 K and 291.3 K. The Rayleigh number of the flow was approximately 109, indicating turbulent conditions. The particle deposition rates were investigated by measuring the intensity of the reflected light from the particles and by using tapered element oscillating microbalance to measure the change in airborne particle mass concentration. The flow field in the mid-plane joining the isothermal walls was investigated using particle image velocimetry. Gas temperature measurements were collected using K-type thermocouple. The flow field and temperature measurements described turbulent flow near the isothermal and horizontal walls encircling the cavity stagnant core region with a stratified temperature distribution. Measurements indicated that the particle concentration at any time was approximately uniform throughout the cavity atmosphere. The measured depletion rate were compared to the theoretical {"}stirred settling{"} model predictions. While the decay rate of 2.5 µm particles was close to that predicted by the theoretical {"}stirred settling{"} model, it was found that 1 µm particles deposited two times faster than the theory predicted.",
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Experimental investigation of a turbulent particle-laden flow inside a cubical differentially heated cavity. / Kalilainen, Jarmo (Corresponding Author); Rantanen, Pekka; Lind, Terttaliisa M.; Auvinen, Ari S. J.; Dehbi, Abdel.

In: Journal of Aerosol Science, Vol. 100, 2016, p. 73-87.

Research output: Contribution to journalArticleScientificpeer-review

TY - JOUR

T1 - Experimental investigation of a turbulent particle-laden flow inside a cubical differentially heated cavity

AU - Kalilainen, Jarmo

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AU - Lind, Terttaliisa M.

AU - Auvinen, Ari S. J.

AU - Dehbi, Abdel

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N2 - The depletion dynamics of 1 µm and 2.5 µm SiO2 aerosol particles inside a differentially heated cavity was investigated experimentally using a cubical DIANA cavity with two opposing isothermal vertical walls and adiabatic top, bottom, front and back walls. The top, front and back walls are made of glass to allow optical access for different laser devices. The cavity atmosphere consisted of air and the isothermal wall temperatures were set to approximately 330.6 K and 291.3 K. The Rayleigh number of the flow was approximately 109, indicating turbulent conditions. The particle deposition rates were investigated by measuring the intensity of the reflected light from the particles and by using tapered element oscillating microbalance to measure the change in airborne particle mass concentration. The flow field in the mid-plane joining the isothermal walls was investigated using particle image velocimetry. Gas temperature measurements were collected using K-type thermocouple. The flow field and temperature measurements described turbulent flow near the isothermal and horizontal walls encircling the cavity stagnant core region with a stratified temperature distribution. Measurements indicated that the particle concentration at any time was approximately uniform throughout the cavity atmosphere. The measured depletion rate were compared to the theoretical "stirred settling" model predictions. While the decay rate of 2.5 µm particles was close to that predicted by the theoretical "stirred settling" model, it was found that 1 µm particles deposited two times faster than the theory predicted.

AB - The depletion dynamics of 1 µm and 2.5 µm SiO2 aerosol particles inside a differentially heated cavity was investigated experimentally using a cubical DIANA cavity with two opposing isothermal vertical walls and adiabatic top, bottom, front and back walls. The top, front and back walls are made of glass to allow optical access for different laser devices. The cavity atmosphere consisted of air and the isothermal wall temperatures were set to approximately 330.6 K and 291.3 K. The Rayleigh number of the flow was approximately 109, indicating turbulent conditions. The particle deposition rates were investigated by measuring the intensity of the reflected light from the particles and by using tapered element oscillating microbalance to measure the change in airborne particle mass concentration. The flow field in the mid-plane joining the isothermal walls was investigated using particle image velocimetry. Gas temperature measurements were collected using K-type thermocouple. The flow field and temperature measurements described turbulent flow near the isothermal and horizontal walls encircling the cavity stagnant core region with a stratified temperature distribution. Measurements indicated that the particle concentration at any time was approximately uniform throughout the cavity atmosphere. The measured depletion rate were compared to the theoretical "stirred settling" model predictions. While the decay rate of 2.5 µm particles was close to that predicted by the theoretical "stirred settling" model, it was found that 1 µm particles deposited two times faster than the theory predicted.

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KW - experiment

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