Experimental investigation of heat transport in inhomogeneous bubbly flow

Biljana Gvozdić, On Yu Dung, Elise Alméras, Dennis P.M. van Gils, Detlef Lohse, Sander G. Huisman, Chao Sun (Corresponding Author)

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)
4 Downloads (Pure)

Abstract

In this work we study the heat transport in inhomogeneous bubbly flow. The experiments were performed in a rectangular bubble column heated from one side wall and cooled from the other, with millimetric bubbles introduced through one half of the injection section (close to the hot wall or close to the cold wall). We characterise the global heat transport while varying two parameters: the gas volume fraction α=0.4–5.1%, and the Rayleigh number RaH=4×109-2.2×1010. As captured by imaging and characterised using Laser Doppler Anemometry (LDA), different flow regimes occur with increasing gas flow rates. In the generated inhomogeneous bubbly flow there are three main contributions to the mixing: (i) transport by the buoyancy driven recirculation, (ii) bubble induced turbulence (BIT) and (iii) shear-induced turbulence (SIT). The strength of these contributions and their interplay depends on the gas volume fraction which is reflected in the measured heat transport enhancement. We compare our results with the findings for heat transport in homogeneous bubbly flow from Gvozdić et al. (2018). We find that for the lower gas volume fractions (α<4%), inhomogeneous bubbly injection results in better heat transport due to induced large-scale circulation. In contrast, for α>4%, when the contribution of SIT becomes stronger, but so does the competition between all three contributions, the homogeneous injection is more efficient.

Original languageEnglish
Pages (from-to)260-267
Number of pages8
JournalChemical engineering science
Volume198
Early online date27 Sep 2018
DOIs
Publication statusPublished - 28 Apr 2019

Fingerprint

Volume fraction
Turbulence
Gases
Bubble columns
Buoyancy
Bubbles (in fluids)
Flow of gases
Flow rate
Imaging techniques
Hot Temperature
Lasers
Experiments

Keywords

  • UT-Hybrid-D
  • Bubbly flows
  • Experiments
  • Heat transfer
  • Bubble column

Cite this

@article{5d76c780bf5948239934afd704586e22,
title = "Experimental investigation of heat transport in inhomogeneous bubbly flow",
abstract = "In this work we study the heat transport in inhomogeneous bubbly flow. The experiments were performed in a rectangular bubble column heated from one side wall and cooled from the other, with millimetric bubbles introduced through one half of the injection section (close to the hot wall or close to the cold wall). We characterise the global heat transport while varying two parameters: the gas volume fraction α=0.4–5.1{\%}, and the Rayleigh number RaH=4×109-2.2×1010. As captured by imaging and characterised using Laser Doppler Anemometry (LDA), different flow regimes occur with increasing gas flow rates. In the generated inhomogeneous bubbly flow there are three main contributions to the mixing: (i) transport by the buoyancy driven recirculation, (ii) bubble induced turbulence (BIT) and (iii) shear-induced turbulence (SIT). The strength of these contributions and their interplay depends on the gas volume fraction which is reflected in the measured heat transport enhancement. We compare our results with the findings for heat transport in homogeneous bubbly flow from Gvozdić et al. (2018). We find that for the lower gas volume fractions (α<4{\%}), inhomogeneous bubbly injection results in better heat transport due to induced large-scale circulation. In contrast, for α>4{\%}, when the contribution of SIT becomes stronger, but so does the competition between all three contributions, the homogeneous injection is more efficient.",
keywords = "UT-Hybrid-D, Bubbly flows, Experiments, Heat transfer, Bubble column",
author = "Biljana Gvozdić and Dung, {On Yu} and Elise Alm{\'e}ras and {van Gils}, {Dennis P.M.} and Detlef Lohse and Huisman, {Sander G.} and Chao Sun",
note = "Elsevier deal",
year = "2019",
month = "4",
day = "28",
doi = "10.1016/j.ces.2018.09.040",
language = "English",
volume = "198",
pages = "260--267",
journal = "Chemical engineering science",
issn = "0009-2509",
publisher = "Elsevier",

}

Experimental investigation of heat transport in inhomogeneous bubbly flow. / Gvozdić, Biljana; Dung, On Yu; Alméras, Elise; van Gils, Dennis P.M.; Lohse, Detlef; Huisman, Sander G.; Sun, Chao (Corresponding Author).

In: Chemical engineering science, Vol. 198, 28.04.2019, p. 260-267.

Research output: Contribution to journalArticleAcademicpeer-review

TY - JOUR

T1 - Experimental investigation of heat transport in inhomogeneous bubbly flow

AU - Gvozdić, Biljana

AU - Dung, On Yu

AU - Alméras, Elise

AU - van Gils, Dennis P.M.

AU - Lohse, Detlef

AU - Huisman, Sander G.

AU - Sun, Chao

N1 - Elsevier deal

PY - 2019/4/28

Y1 - 2019/4/28

N2 - In this work we study the heat transport in inhomogeneous bubbly flow. The experiments were performed in a rectangular bubble column heated from one side wall and cooled from the other, with millimetric bubbles introduced through one half of the injection section (close to the hot wall or close to the cold wall). We characterise the global heat transport while varying two parameters: the gas volume fraction α=0.4–5.1%, and the Rayleigh number RaH=4×109-2.2×1010. As captured by imaging and characterised using Laser Doppler Anemometry (LDA), different flow regimes occur with increasing gas flow rates. In the generated inhomogeneous bubbly flow there are three main contributions to the mixing: (i) transport by the buoyancy driven recirculation, (ii) bubble induced turbulence (BIT) and (iii) shear-induced turbulence (SIT). The strength of these contributions and their interplay depends on the gas volume fraction which is reflected in the measured heat transport enhancement. We compare our results with the findings for heat transport in homogeneous bubbly flow from Gvozdić et al. (2018). We find that for the lower gas volume fractions (α<4%), inhomogeneous bubbly injection results in better heat transport due to induced large-scale circulation. In contrast, for α>4%, when the contribution of SIT becomes stronger, but so does the competition between all three contributions, the homogeneous injection is more efficient.

AB - In this work we study the heat transport in inhomogeneous bubbly flow. The experiments were performed in a rectangular bubble column heated from one side wall and cooled from the other, with millimetric bubbles introduced through one half of the injection section (close to the hot wall or close to the cold wall). We characterise the global heat transport while varying two parameters: the gas volume fraction α=0.4–5.1%, and the Rayleigh number RaH=4×109-2.2×1010. As captured by imaging and characterised using Laser Doppler Anemometry (LDA), different flow regimes occur with increasing gas flow rates. In the generated inhomogeneous bubbly flow there are three main contributions to the mixing: (i) transport by the buoyancy driven recirculation, (ii) bubble induced turbulence (BIT) and (iii) shear-induced turbulence (SIT). The strength of these contributions and their interplay depends on the gas volume fraction which is reflected in the measured heat transport enhancement. We compare our results with the findings for heat transport in homogeneous bubbly flow from Gvozdić et al. (2018). We find that for the lower gas volume fractions (α<4%), inhomogeneous bubbly injection results in better heat transport due to induced large-scale circulation. In contrast, for α>4%, when the contribution of SIT becomes stronger, but so does the competition between all three contributions, the homogeneous injection is more efficient.

KW - UT-Hybrid-D

KW - Bubbly flows

KW - Experiments

KW - Heat transfer

KW - Bubble column

UR - http://www.scopus.com/inward/record.url?scp=85054380771&partnerID=8YFLogxK

U2 - 10.1016/j.ces.2018.09.040

DO - 10.1016/j.ces.2018.09.040

M3 - Article

VL - 198

SP - 260

EP - 267

JO - Chemical engineering science

JF - Chemical engineering science

SN - 0009-2509

ER -