Forced convective heat transfer to turbulent CO2 in the supercritical region

Bourke, Paula; Pulling, D.J.; Gill, L.E.; Denton, W.H.

doi:10.1016/0017-9310(70)90074-8

Cited by 80 publications

(15 citation statements)

References 5 publications

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“…That the anomalous behavior of heat transfer to supercritical fluids was really due to buoyancy became apparent when the experimental results for upward flows were compared with those for downward flows under otherwise the same conditions by Hall and Jackson, 4 Jackson et al 5 and other investigators. 6,7 Hall and Jackson 4 also provided a theoretical explanation of the mechanism of deteriorated heat transfer, suggesting that the dominant factor was the modification of the shear stress distribution across the pipe with consequential change in turbulence production. Jackson and Hall 8,9 later provided a general criterion for the onset of buoyancy effects applicable to both SCP and subcritical pressure fluids.…”

Section: Introductionmentioning

confidence: 97%

Direct numerical simulation of turbulent supercritical flows with heat transfer

2005

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Turbulent heat transfer to CO2 at supercritical pressure flowing in heated vertical tubes is investigated using direct numerical simulation at the inlet Reynolds number Re0=5400, which is based on inlet bulk velocity and tube diameter. Temperature range within the flow field covers the pseudocritical region, where very significant fluid property variations are involved. Both upward and downward flows are considered. The wall temperature distribution shows well-known heat transfer deterioration characterized by the localized peak in upward flows, while no such anomaly is observed in downward flows. The deterioration occurs at the region where turbulence is attenuated significantly, and is followed by the enhancement with restoration of turbulence caused by complicated interactions with a buoyancy effect. Further investigation of turbulence statistics indicates that ρux″ux″¯, ρux″ur″¯, and ρux″h″¯ are significantly affected by their respective buoyancy production terms due to ρ′ux′¯, ρ′ur′¯, and ρ′h′¯ which are proven to be significant in vertical supercritical flows. Combined with the deformation of mean velocity profile into an M-shaped one in upward flow, ρ′ux′¯ becomes negatively correlated from a certain downstream region so that ρux″h″¯ undergoes a very complicated transition changing both in sign and magnitude, causing severe impairment of heat transfer in upward supercritical flows.

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Section: Introductionmentioning

confidence: 97%

Direct numerical simulation of turbulent supercritical flows with heat transfer

2005

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“…As a result, significant progress was achieved in correlating data and understanding some of the special features of heat and mass transfer processes of super-critical pressure fluids [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. A number of detailed reviews on the research on heat transfer to fluids at super-critical pressures can be found in the literature, for example, Petukhov [2,3], Hall [4], Hall and Jackson [5], and Jackson [1].…”

Section: Introductionmentioning

confidence: 99%

“…The effect of buoyancy in the mixed convection regime can also create a noticeable difference compared to forced convection. Comprehensive research on internal forced and mixed convection heat transfer of super-critical fluids in normal size tubes has been done in the past 50 years [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20]. However, to the authorsÕ knowledge, there is very limited work on convection heat transfer of super-critical fluids in mini-/micro-scale tubes and porous media [23][24][25][26].…”

Section: Introductionmentioning

confidence: 99%

Experimental investigation of convection heat transfer of CO2 at super-critical pressures in vertical mini-tubes and in porous media

Jiang

et al. 2004

Applied Thermal Engineering

103

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“…Over the past several decades, a number of experimental investigations on heat transfer at supercritical pressures were carried out [4][5][6][7][8][9][10][11][12][13][14], the majority of which were on the turbulent flows in round tubes. According to these investigations, either enhanced or deteriorated heat transfer regime occurred in the supercritical fluid flows depending on the controlling parameters.…”

Section: Introductionmentioning

confidence: 99%

A Novel Model of Turbulent Convective Heat Transfer in Round Tubes at Supercritical Pressures

Mao¹,

Bai²,

Guo³

2011

Heat Transfer Engineering

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In the present study, a novel model was established to investigate the enhanced heat transfer to turbulent pipe flow of supercritical pressure fluids. The governing equations for the steady turbulent compressible pipe flow were simplified into the one-dimensional nondimensionalized forms based on the boundary layer theory. A conventional mixing length turbulence model for constant-property pipe flows was modified by introducing the effect of density fluctuations into the equations of turbulent transport, and the modified turbulence model was applicable to both constant-property and variable-property pipe flows. With the suggested model, which was a combination of the nondimensional governing equations and the modified turbulence model, the numerical calculations were carried out for the turbulent convective heat transfer of water in round tubes at supercritical pressures. The results showed that the present model can provide a relatively precise prediction about the effect of pressure, mass flux, and wall heat flux on heat transfer for supercritical fluid flows and greatly reduce the calculation workload. The modified turbulence model showed a much better agreement with the experimental results than the original turbulence model.

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Forced convective heat transfer to turbulent CO2 in the supercritical region

Cited by 80 publications

References 5 publications

Direct numerical simulation of turbulent supercritical flows with heat transfer

Direct numerical simulation of turbulent supercritical flows with heat transfer

Experimental investigation of convection heat transfer of CO2 at super-critical pressures in vertical mini-tubes and in porous media

A Novel Model of Turbulent Convective Heat Transfer in Round Tubes at Supercritical Pressures

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