Heat transfer to sub- and supercritical water flowing upward in a vertical tube at low mass fluxes: numerical analysis and experimental validation

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Abstract

Heat transfer to supercritical water (SCW) flowing upward in a vertical heated tube at low mass fluxes (G ≤ 20 kg/m2 s) has been numerically investigated in COMSOL Multiphysics and validated with experimental data. The turbulence models, essential to describing local turbulence, in COMSOL have been checked under conditions in which empirical heat-transfer correlations are available, and it is concluded that the shear-stress transport (SST) turbulence model gives the most accurate results. The numerical results obtained show a buoyancy induced circulation of the fluid resulting from gravitational force acting on density gradients as well as a thin thermal boundary layer with a steep temperature gradient at the inner wall and a flat temperature profile in the bulk fluid. The heat-transfer coefficient of SCW is enhanced near the pseudocritical temperature (Tpc) and is deteriorated at temperatures above Tpc. A new heat-transfer correlation has been developed and validated with experimental data.
Original languageEnglish
Pages (from-to)13120-13131
Number of pages12
JournalIndustrial and engineering chemistry research
Volume55
Issue number51
DOIs
Publication statusPublished - 2016

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Numerical analysis
Mass transfer
Heat transfer
Turbulence models
Water
Fluids
Buoyancy
Thermal gradients
Temperature
Heat transfer coefficients
Shear stress
Boundary layers
Turbulence
Hot Temperature

Keywords

  • IR-103906
  • METIS-320698

Cite this

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title = "Heat transfer to sub- and supercritical water flowing upward in a vertical tube at low mass fluxes: numerical analysis and experimental validation",
abstract = "Heat transfer to supercritical water (SCW) flowing upward in a vertical heated tube at low mass fluxes (G ≤ 20 kg/m2 s) has been numerically investigated in COMSOL Multiphysics and validated with experimental data. The turbulence models, essential to describing local turbulence, in COMSOL have been checked under conditions in which empirical heat-transfer correlations are available, and it is concluded that the shear-stress transport (SST) turbulence model gives the most accurate results. The numerical results obtained show a buoyancy induced circulation of the fluid resulting from gravitational force acting on density gradients as well as a thin thermal boundary layer with a steep temperature gradient at the inner wall and a flat temperature profile in the bulk fluid. The heat-transfer coefficient of SCW is enhanced near the pseudocritical temperature (Tpc) and is deteriorated at temperatures above Tpc. A new heat-transfer correlation has been developed and validated with experimental data.",
keywords = "IR-103906, METIS-320698",
author = "Odu, {Samuel Obarinu} and P. Koster and {van der Ham}, {Aloysius G.J.} and {van der Hoef}, {Martin Anton} and Kersten, {Sascha R.A.}",
year = "2016",
doi = "10.1021/acs.iecr.6b03268",
language = "English",
volume = "55",
pages = "13120--13131",
journal = "Industrial and engineering chemistry research",
issn = "0888-5885",
publisher = "American Chemical Society",
number = "51",

}

TY - JOUR

T1 - Heat transfer to sub- and supercritical water flowing upward in a vertical tube at low mass fluxes: numerical analysis and experimental validation

AU - Odu, Samuel Obarinu

AU - Koster, P.

AU - van der Ham, Aloysius G.J.

AU - van der Hoef, Martin Anton

AU - Kersten, Sascha R.A.

PY - 2016

Y1 - 2016

N2 - Heat transfer to supercritical water (SCW) flowing upward in a vertical heated tube at low mass fluxes (G ≤ 20 kg/m2 s) has been numerically investigated in COMSOL Multiphysics and validated with experimental data. The turbulence models, essential to describing local turbulence, in COMSOL have been checked under conditions in which empirical heat-transfer correlations are available, and it is concluded that the shear-stress transport (SST) turbulence model gives the most accurate results. The numerical results obtained show a buoyancy induced circulation of the fluid resulting from gravitational force acting on density gradients as well as a thin thermal boundary layer with a steep temperature gradient at the inner wall and a flat temperature profile in the bulk fluid. The heat-transfer coefficient of SCW is enhanced near the pseudocritical temperature (Tpc) and is deteriorated at temperatures above Tpc. A new heat-transfer correlation has been developed and validated with experimental data.

AB - Heat transfer to supercritical water (SCW) flowing upward in a vertical heated tube at low mass fluxes (G ≤ 20 kg/m2 s) has been numerically investigated in COMSOL Multiphysics and validated with experimental data. The turbulence models, essential to describing local turbulence, in COMSOL have been checked under conditions in which empirical heat-transfer correlations are available, and it is concluded that the shear-stress transport (SST) turbulence model gives the most accurate results. The numerical results obtained show a buoyancy induced circulation of the fluid resulting from gravitational force acting on density gradients as well as a thin thermal boundary layer with a steep temperature gradient at the inner wall and a flat temperature profile in the bulk fluid. The heat-transfer coefficient of SCW is enhanced near the pseudocritical temperature (Tpc) and is deteriorated at temperatures above Tpc. A new heat-transfer correlation has been developed and validated with experimental data.

KW - IR-103906

KW - METIS-320698

U2 - 10.1021/acs.iecr.6b03268

DO - 10.1021/acs.iecr.6b03268

M3 - Article

VL - 55

SP - 13120

EP - 13131

JO - Industrial and engineering chemistry research

JF - Industrial and engineering chemistry research

SN - 0888-5885

IS - 51

ER -