Numerical investigation of system pressure effect on heat transfer of supercritical water flows in a horizontal round tube

Shang, Zhi; Yao, Yufeng; Chen, Shuo

doi:10.1016/j.ces.2008.05.036

Cited by 27 publications

(21 citation statements)

References 9 publications

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“…In [9] it studied the horizontal tubes compared with the experiments in [6] and found the Speziale non-linear high Reynolds k-ε turbulence model with the Hassid and Poreh near-wall treatment under y + < 1.0 can give good predictions of the heat transfer of SCW using STAR-CD code. In this paper, the mesh partition method (stretched mesh near wall and general structure mesh inside main flow domain), y + value and the Speziale non-linear high…”

Section: Turbulence Modellingmentioning

confidence: 99%

“…For dealing with this issue, STAR-CD uses some one-equation turbulence models to perform the simulations for the regions of y + < 10.0. Through the sensitive studies of the one-equation turbulence models for the heat transfer of SCW, in [9] it indicated that the Hassid and Poreh in [18] model would be the best to describe the flow and heat transfer of SCW within the near wall regions. This one-equation mode calculates the turbulence kinetic energy k from the transport equation like equation (6) , where y is the normal distance from the wall.…”

Section: Turbulence Modellingmentioning

confidence: 99%

“…1. Through the studies in [9,[11][12][13], it is found that the thermal-physical properties of SCW affect the heat transfer of SCW straightly.…”

Section: Association Of Properties Of Water and Steam (Iapws)mentioning

confidence: 99%

“…Reynolds k-ε turbulence model with the Hassid and Poreh near-wall treatment are adopted same as in [9,[14][15].…”

Section: Turbulence Modellingmentioning

confidence: 99%

“…Usually, these effects will introduce a full-3D flow in the horizontal tube in [9][10]. Therefore, it is necessary to use a multi dimensional method to analyze the flows in horizontal tubes.…”

Section: Introductionmentioning

confidence: 99%

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Numerical investigation of diameter effect on heat transfer of supercritical water flows in horizontal round tubes

Shang

Chen

2011

Applied Thermal Engineering

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The diameter effect on the heat transfer of supercritical water (SCW) flows in horizontal round tubes has been studied using computational fluid dynamics (CFD) technique. The numerical simulations are carried out by the STAR-CD solver combined with the user developed subroutines that control the numerical calculation procedures.Through the tests it is found that the discretization scheme using CD, LUD or MARS will not affect the accuracy of the numerical simulations. Through the diameter effect studies, it is found that the heat transfer of supercritical water flows in the horizontal round tube is strongly affected by the buoyancy especially for the large diameter tube.The large diameter (D=10mm) tube will have the high risk to have the strong heat transfer deterioration that can introduce 180 o C wall temperature difference between the top and bottom surfaces due to the buoyancy effects.The magnitudes of the effects can be quantificationally expressed by a ratio of Grashof number over Reynolds number square. Under the high mass flux regime, the heat transfer deterioration will disappear for all the diameters from 5mm to 10mm. The different secondary flow patterns at different tube diameters are also studied.

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Section: Turbulence Modellingmentioning

confidence: 99%

Section: Turbulence Modellingmentioning

confidence: 99%

“…1. Through the studies in [9,[11][12][13], it is found that the thermal-physical properties of SCW affect the heat transfer of SCW straightly.…”

Section: Association Of Properties Of Water and Steam (Iapws)mentioning

confidence: 99%

“…Reynolds k-ε turbulence model with the Hassid and Poreh near-wall treatment are adopted same as in [9,[14][15].…”

Section: Turbulence Modellingmentioning

confidence: 99%

Section: Introductionmentioning