INFLUENCE OF THE VALUE OF THE HEAT FLOW SUPPLIED TO THE CHANNEL WALL ON THE SPATIAL DISTRIBUTION OF THE SUPERCRITICAL WATER VISCOSITY


  • N.M. Fialko Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • A.V. Nosovskyi Institute of Safety Problems of Nuclear Power Plants of the National Academy of Sciences of Ukraine
  • N.O. Meranova Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • Yu.V. Sherenkovsky Institute of Engineering Thermophysics of the National Academy of Sciences of Ukraine
  • I.L Pioro Faculty of Energy Systems and Nuclear Science University of Ontario Institute of Technology
Keywords: supercritical water, dynamic and kinematic viscosity, CFD modeling

Abstract

The data of CFD analysis of the fields of dynamic and kinematic viscosity of supercritical water in round channels for different values ​​of the heat flux q supplied to the wall are presented. Based on the results of solving a nonlinear problem of mixed convection (forced and natural) with an upward flow of water in vertical channels, its temperature fields are obtained, which determine the corresponding viscosity distributions. The features of the formation of temperature fields for different values ​​of q in the initial section of the channel, where supercritical water is in a pseudo liquid state, are considered. The research data on the regularities of the effect of the supplied heat flux q on the spatial distributions of the dynamic viscosity μ of supercritical water are presented. In particular, it is shown that the decrease in the value of μ downstream is more significant at large values ​​of q. It has been established that the kinematic viscosity of supercritical water is practically unchanged in the initial section of the pipe, the length of which is determined by the value of the supplied heat flux q It is also shown that the increase in the viscosity of supercritical water downstream outside the specified section is the more significant, the larger the value of q.

References

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Published
2022-12-21
How to Cite
Fialko, N., Nosovskyi, A., Meranova, N., Sherenkovsky, Y., & Pioro, I. (2022). INFLUENCE OF THE VALUE OF THE HEAT FLOW SUPPLIED TO THE CHANNEL WALL ON THE SPATIAL DISTRIBUTION OF THE SUPERCRITICAL WATER VISCOSITY. Thermophysics and Thermal Power Engineering, 44(4), 31-39. Retrieved from https://ihe.nas.gov.ua/index.php/journal/article/view/510
Issue
Vol 44 No 4 (2022): Thermophysics and Thermal Power Engineering
Section
Articles
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