Experimental investigation of the thermal hydraulics of supercritical water under natural circulation in a closed loop

Attila Kiss, Márton Balaskó, L. Horváth, Zoltán Kis, Attila Aszódi

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The thermal hydraulics of supercritical water under forced-, mixed convection and natural circulation conditions is not fully understood. In order to study the thermal hydraulic behaviour of this fluid under natural circulation conditions a small size, closed experimental loop has been designed and built. The thermal hydraulic phenomenon occurring in the loop can be measured by thermocouples mounted onto the outer surface of the heated tube wall, absolute and differential pressure transducers and a flow meter; moreover, simultaneously can be visualized by neutron radiography techniques. This paper describes the loop itself, the process of the experiment with the measurement techniques, the data acquisition system applied and the results got during the first measurement series. Based on the results of the first measurement series, it was found that the measured part of the steady state characteristic is independent from the system pressure. A slight dependence of steady state characteristic on the inlet temperature can be identified: the higher the inlet temperature the higher the mass flow rate. The total pressure drop and its components seem to be independent from the system pressure but strongly dependent on the inlet temperature due to the influence of bulk-fluid temperature on the relevant thermophysical properties (density and dynamic viscosity). The pressure drop due to acceleration of flow found to be negligible next to the two dominant components, the pressure drop due to frictional resistance and due to gravity. The coupled evaluation of the radiographic images and the thermophysical properties of water have shown that the main driving force behind the decrease of the neutron attenuation is the decreasing water density as the bulk-fluid temperature increases. The reverse of this relationship could be exploited during the validation of future Monte Carlo simulations.

Original languageEnglish
Pages (from-to)178-203
Number of pages26
JournalAnnals of Nuclear Energy
Volume100
DOIs
Publication statusPublished - Feb 1 2017

Fingerprint

Hydraulics
Pressure drop
Water
Fluids
Thermodynamic properties
Temperature
Neutron radiography
Mixed convection
Pressure transducers
Thermocouples
Data acquisition
Gravitation
Neutrons
Flow rate
Hot Temperature
Viscosity
Experiments

Keywords

  • Experiment
  • Hydraulic resistance
  • Neutron radiography
  • Pressure drop
  • Supercritical water
  • Thermal hydraulics of natural circulation

ASJC Scopus subject areas

  • Nuclear Energy and Engineering

Cite this

Experimental investigation of the thermal hydraulics of supercritical water under natural circulation in a closed loop. / Kiss, Attila; Balaskó, Márton; Horváth, L.; Kis, Zoltán; Aszódi, Attila.

In: Annals of Nuclear Energy, Vol. 100, 01.02.2017, p. 178-203.

Research output: Contribution to journalArticle

Kiss, Attila ; Balaskó, Márton ; Horváth, L. ; Kis, Zoltán ; Aszódi, Attila. / Experimental investigation of the thermal hydraulics of supercritical water under natural circulation in a closed loop. In: Annals of Nuclear Energy. 2017 ; Vol. 100. pp. 178-203.
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