Experimental investigation of flow resistance and convection heat transfer of CO2 at supercritical pressures in a vertical porous tube

P. X. Jiang, Y. F. Shi, Y. J. Xu, Shuisheng He, J. D. Jackson

Research output: Contribution to journalArticle

38 Citations (Scopus)

Abstract

Experiments were conducted to measure the convection heat transfer in a vertical porous tube with particle diameters of 0.2-0.28 mm at supercritical pressures. The local heat transfer coefficients, fluid bulk temperatures and wall temperatures were measured to investigate the influence of the inlet fluid temperature, pressure, heat flux and flow direction on the convection beat transfer in the porous tube. The measured friction factors in a heated tube are much larger than those predicted using the Aerov-Tojec correlation for both upward and downward flows. Therefore, two new correlations are presented for upward and for downward flows to predict the friction factors of supercritical pressure CO2 in heated porous tubes. The experimental results also show that the inlet temperature, pressure and heat flux all significantly influence the convection heat transfer. When the inlet temperature (T-0) is higher than the pseudocritical temperature (T-pc), the local heat transfer coefficients are much less than those when the inlet temperature is lower than the pseudocritical temperature. The convection heat transfer coefficients are found to vary nonlinearly with heat flux. For T-0 < T-pc the local heat transfer coefficients along the porous tube have a maximum for upward flow and have a peak value for downward flow when the local fluid bulk temperatures are near T-pc And the wall temperatures are slightly higher than Tpc. The different variations of the local heat transfer coefficients along the porous tube for upward and downward flows are attributed to the effect of buoyancy. However, when the wall temperatures are much higher than T-pc the local heat transfer coefficients along the porous tube decrease continuously for both upward and downward flows. (c) 2005 Elsevier B.V. All rights reserved.

Original languageEnglish
Pages (from-to)339-346
Number of pages7
JournalJournal of Supercritical Fluids
Volume38
DOIs
Publication statusPublished - 2006

Keywords

  • supercritical fluid
  • heat transfer
  • porous tube
  • carbon dioxide
  • experimental investigation
  • flow resistance
  • BOUNDARY-CONDITIONS
  • PLATE CHANNELS
  • PACKED-BEDS
  • FLUID-FLOW
  • MEDIA

Cite this

Experimental investigation of flow resistance and convection heat transfer of CO2 at supercritical pressures in a vertical porous tube. / Jiang, P. X.; Shi, Y. F.; Xu, Y. J.; He, Shuisheng; Jackson, J. D.

In: Journal of Supercritical Fluids, Vol. 38, 2006, p. 339-346.

Research output: Contribution to journalArticle

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AU - Shi, Y. F.

AU - Xu, Y. J.

AU - He, Shuisheng

AU - Jackson, J. D.

PY - 2006

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N2 - Experiments were conducted to measure the convection heat transfer in a vertical porous tube with particle diameters of 0.2-0.28 mm at supercritical pressures. The local heat transfer coefficients, fluid bulk temperatures and wall temperatures were measured to investigate the influence of the inlet fluid temperature, pressure, heat flux and flow direction on the convection beat transfer in the porous tube. The measured friction factors in a heated tube are much larger than those predicted using the Aerov-Tojec correlation for both upward and downward flows. Therefore, two new correlations are presented for upward and for downward flows to predict the friction factors of supercritical pressure CO2 in heated porous tubes. The experimental results also show that the inlet temperature, pressure and heat flux all significantly influence the convection heat transfer. When the inlet temperature (T-0) is higher than the pseudocritical temperature (T-pc), the local heat transfer coefficients are much less than those when the inlet temperature is lower than the pseudocritical temperature. The convection heat transfer coefficients are found to vary nonlinearly with heat flux. For T-0 < T-pc the local heat transfer coefficients along the porous tube have a maximum for upward flow and have a peak value for downward flow when the local fluid bulk temperatures are near T-pc And the wall temperatures are slightly higher than Tpc. The different variations of the local heat transfer coefficients along the porous tube for upward and downward flows are attributed to the effect of buoyancy. However, when the wall temperatures are much higher than T-pc the local heat transfer coefficients along the porous tube decrease continuously for both upward and downward flows. (c) 2005 Elsevier B.V. All rights reserved.

AB - Experiments were conducted to measure the convection heat transfer in a vertical porous tube with particle diameters of 0.2-0.28 mm at supercritical pressures. The local heat transfer coefficients, fluid bulk temperatures and wall temperatures were measured to investigate the influence of the inlet fluid temperature, pressure, heat flux and flow direction on the convection beat transfer in the porous tube. The measured friction factors in a heated tube are much larger than those predicted using the Aerov-Tojec correlation for both upward and downward flows. Therefore, two new correlations are presented for upward and for downward flows to predict the friction factors of supercritical pressure CO2 in heated porous tubes. The experimental results also show that the inlet temperature, pressure and heat flux all significantly influence the convection heat transfer. When the inlet temperature (T-0) is higher than the pseudocritical temperature (T-pc), the local heat transfer coefficients are much less than those when the inlet temperature is lower than the pseudocritical temperature. The convection heat transfer coefficients are found to vary nonlinearly with heat flux. For T-0 < T-pc the local heat transfer coefficients along the porous tube have a maximum for upward flow and have a peak value for downward flow when the local fluid bulk temperatures are near T-pc And the wall temperatures are slightly higher than Tpc. The different variations of the local heat transfer coefficients along the porous tube for upward and downward flows are attributed to the effect of buoyancy. However, when the wall temperatures are much higher than T-pc the local heat transfer coefficients along the porous tube decrease continuously for both upward and downward flows. (c) 2005 Elsevier B.V. All rights reserved.

KW - supercritical fluid

KW - heat transfer

KW - porous tube

KW - carbon dioxide

KW - experimental investigation

KW - flow resistance

KW - BOUNDARY-CONDITIONS

KW - PLATE CHANNELS

KW - PACKED-BEDS

KW - FLUID-FLOW

KW - MEDIA

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VL - 38

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JO - Journal of Supercritical Fluids

JF - Journal of Supercritical Fluids

SN - 0896-8446

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