PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed

J Kolehmainen, J Elfvengren, M Ylönen, P Saarenrinne, Sirpa Kallio, Juho Peltola

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

Abstract

Fluidized beds are used in a wide variety of industrial applications ranging from power generation to chemical industry. In a fluidized bed pressurised gas is blown from the bottom of the bed to a solid mass consisting of small particles. The drag force between the gas and the particles causes the bed become fluidized. Fluidized beds can be roughly categorized as bubbling, turbulent, or circulating fluidized beds with increasing fluidization air velocity. In this study, particle velocities and sizes are measured using Particle Tracking Velocimetry (PTV) combined with Particle Image Velocimetry (PIV) in near the top of a turbulent fluidized bed containing two particle populations. In this region the suspension is typically dilute and thus the dispersed phase behaviour is mostly determined by fluid-particle interactions. The dispersed phase velocity measurements were used to compute the time averaged velocity fluctuations and Reynolds stresses. The velocities were categorized by horizontal position, and by measured mass averaged mean fluidization air velocity. The results were compared to few circulating and bubbling fluidized bed studies. The particle velocity profile near the wall was similar to profiles observed in the circulating fluidized bed studies. It was also noticed that the large particles exited the upward flow before smaller particles which lead to differences in comparison to circulating fluidized bed studies. The approach of using a combination of PIV and PTV to handle the varying particle densities was found out to be effective when dealing with flows of highly variable particle densities. In a test case, it was found out that the PIV velocity estimates are slightly less than the corresponding PTV estimated velocities
Original languageEnglish
Title of host publicationProceedings of the International Conference on Heat Transfer and Fluid Flow
Place of PublicationPrague
Number of pages9
Publication statusPublished - 2014
MoE publication typeA4 Article in a conference publication
EventInternational Conference on Heat Transfer and Fluid Flow, HTFF'14 - Prague, Czech Republic
Duration: 11 Aug 201412 Aug 2014

Conference

ConferenceInternational Conference on Heat Transfer and Fluid Flow, HTFF'14
Abbreviated titleHTFF'14
CountryCzech Republic
CityPrague
Period11/08/1412/08/14

Fingerprint

phase velocity
fluidization
particle
particle image velocimetry
chemical industry
air
velocity profile
power generation
gas
drag

Keywords

  • Fluidized Bed
  • Particle Tracking Velocimetry (PTV)
  • Particle Image Velocimetry (PIV)
  • Particle Swarm Optimization (PSO)
  • Solid Phase Reynolds Stress

Cite this

Kolehmainen, J., Elfvengren, J., Ylönen, M., Saarenrinne, P., Kallio, S., & Peltola, J. (2014). PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed. In Proceedings of the International Conference on Heat Transfer and Fluid Flow [Paper no. 70] Prague.
Kolehmainen, J ; Elfvengren, J ; Ylönen, M ; Saarenrinne, P ; Kallio, Sirpa ; Peltola, Juho. / PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed. Proceedings of the International Conference on Heat Transfer and Fluid Flow. Prague, 2014.
@inproceedings{e08e9ec0427349139cd938b1b6df81a0,
title = "PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed",
abstract = "Fluidized beds are used in a wide variety of industrial applications ranging from power generation to chemical industry. In a fluidized bed pressurised gas is blown from the bottom of the bed to a solid mass consisting of small particles. The drag force between the gas and the particles causes the bed become fluidized. Fluidized beds can be roughly categorized as bubbling, turbulent, or circulating fluidized beds with increasing fluidization air velocity. In this study, particle velocities and sizes are measured using Particle Tracking Velocimetry (PTV) combined with Particle Image Velocimetry (PIV) in near the top of a turbulent fluidized bed containing two particle populations. In this region the suspension is typically dilute and thus the dispersed phase behaviour is mostly determined by fluid-particle interactions. The dispersed phase velocity measurements were used to compute the time averaged velocity fluctuations and Reynolds stresses. The velocities were categorized by horizontal position, and by measured mass averaged mean fluidization air velocity. The results were compared to few circulating and bubbling fluidized bed studies. The particle velocity profile near the wall was similar to profiles observed in the circulating fluidized bed studies. It was also noticed that the large particles exited the upward flow before smaller particles which lead to differences in comparison to circulating fluidized bed studies. The approach of using a combination of PIV and PTV to handle the varying particle densities was found out to be effective when dealing with flows of highly variable particle densities. In a test case, it was found out that the PIV velocity estimates are slightly less than the corresponding PTV estimated velocities",
keywords = "Fluidized Bed, Particle Tracking Velocimetry (PTV), Particle Image Velocimetry (PIV), Particle Swarm Optimization (PSO), Solid Phase Reynolds Stress",
author = "J Kolehmainen and J Elfvengren and M Yl{\"o}nen and P Saarenrinne and Sirpa Kallio and Juho Peltola",
note = "Project code: 73052",
year = "2014",
language = "English",
isbn = "978-1-927877-09-8",
booktitle = "Proceedings of the International Conference on Heat Transfer and Fluid Flow",

}

Kolehmainen, J, Elfvengren, J, Ylönen, M, Saarenrinne, P, Kallio, S & Peltola, J 2014, PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed. in Proceedings of the International Conference on Heat Transfer and Fluid Flow., Paper no. 70, Prague, International Conference on Heat Transfer and Fluid Flow, HTFF'14, Prague, Czech Republic, 11/08/14.

PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed. / Kolehmainen, J; Elfvengren, J; Ylönen, M; Saarenrinne, P; Kallio, Sirpa; Peltola, Juho.

Proceedings of the International Conference on Heat Transfer and Fluid Flow. Prague, 2014. Paper no. 70.

Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

TY - GEN

T1 - PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed

AU - Kolehmainen, J

AU - Elfvengren, J

AU - Ylönen, M

AU - Saarenrinne, P

AU - Kallio, Sirpa

AU - Peltola, Juho

N1 - Project code: 73052

PY - 2014

Y1 - 2014

N2 - Fluidized beds are used in a wide variety of industrial applications ranging from power generation to chemical industry. In a fluidized bed pressurised gas is blown from the bottom of the bed to a solid mass consisting of small particles. The drag force between the gas and the particles causes the bed become fluidized. Fluidized beds can be roughly categorized as bubbling, turbulent, or circulating fluidized beds with increasing fluidization air velocity. In this study, particle velocities and sizes are measured using Particle Tracking Velocimetry (PTV) combined with Particle Image Velocimetry (PIV) in near the top of a turbulent fluidized bed containing two particle populations. In this region the suspension is typically dilute and thus the dispersed phase behaviour is mostly determined by fluid-particle interactions. The dispersed phase velocity measurements were used to compute the time averaged velocity fluctuations and Reynolds stresses. The velocities were categorized by horizontal position, and by measured mass averaged mean fluidization air velocity. The results were compared to few circulating and bubbling fluidized bed studies. The particle velocity profile near the wall was similar to profiles observed in the circulating fluidized bed studies. It was also noticed that the large particles exited the upward flow before smaller particles which lead to differences in comparison to circulating fluidized bed studies. The approach of using a combination of PIV and PTV to handle the varying particle densities was found out to be effective when dealing with flows of highly variable particle densities. In a test case, it was found out that the PIV velocity estimates are slightly less than the corresponding PTV estimated velocities

AB - Fluidized beds are used in a wide variety of industrial applications ranging from power generation to chemical industry. In a fluidized bed pressurised gas is blown from the bottom of the bed to a solid mass consisting of small particles. The drag force between the gas and the particles causes the bed become fluidized. Fluidized beds can be roughly categorized as bubbling, turbulent, or circulating fluidized beds with increasing fluidization air velocity. In this study, particle velocities and sizes are measured using Particle Tracking Velocimetry (PTV) combined with Particle Image Velocimetry (PIV) in near the top of a turbulent fluidized bed containing two particle populations. In this region the suspension is typically dilute and thus the dispersed phase behaviour is mostly determined by fluid-particle interactions. The dispersed phase velocity measurements were used to compute the time averaged velocity fluctuations and Reynolds stresses. The velocities were categorized by horizontal position, and by measured mass averaged mean fluidization air velocity. The results were compared to few circulating and bubbling fluidized bed studies. The particle velocity profile near the wall was similar to profiles observed in the circulating fluidized bed studies. It was also noticed that the large particles exited the upward flow before smaller particles which lead to differences in comparison to circulating fluidized bed studies. The approach of using a combination of PIV and PTV to handle the varying particle densities was found out to be effective when dealing with flows of highly variable particle densities. In a test case, it was found out that the PIV velocity estimates are slightly less than the corresponding PTV estimated velocities

KW - Fluidized Bed

KW - Particle Tracking Velocimetry (PTV)

KW - Particle Image Velocimetry (PIV)

KW - Particle Swarm Optimization (PSO)

KW - Solid Phase Reynolds Stress

M3 - Conference article in proceedings

SN - 978-1-927877-09-8

BT - Proceedings of the International Conference on Heat Transfer and Fluid Flow

CY - Prague

ER -

Kolehmainen J, Elfvengren J, Ylönen M, Saarenrinne P, Kallio S, Peltola J. PTV and PIV Based Dispersed Phase Velocity Measurements in a pseudo-2D Turbulent Fluidized Bed. In Proceedings of the International Conference on Heat Transfer and Fluid Flow. Prague. 2014. Paper no. 70