Experimental investigation of the rewetting process at pressures of 1-7 bar

Experimental investigation of the rewetting process at pressures of 1-7 bar

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Title

Experimental investigation of the rewetting process at pressures of 1-7 bar (EN)

Creator

Simopoulos, SE (EN)

Hinis, EP (EN)

Type

journalArticle (EN)

Partial document
Publication in journal (EN)

Article
Scientific article (EN)

Issued

2014-03-01T01:18:59Z

2003 (EN)

Year

2003 (EN)

Description

Several water experiments have been carried out to investigate the physical mechanisms relevant to the rewetting phenomena either at atmospheric conditions or in a steam environment. Yet, there seems to be a scarcity of experimental data for the low pressure range from 2 to 7 bar with parameters the liquid film flowrate and the subcooling. An experimental facility to simulate two-phase low-pressure water flow phenomena has been designed, constructed and employed to investigate the rewetting process of hot surfaces in a water-steam environment at pressures in the above range, as well as at atmospheric conditions; the facility is on-line interfaced to computers which control its operation and undertake all the data acquisition tasks. Furthermore, a numerical method to experimentally evaluate the wet front position along the rod was introduced. The present paper describes the experimental work aimed at studying the wet front propagation along a stainless steel fuel rod, in a top-flooding environment in the pressure range of 1-7 bar, wall temperatures up to 550 degreesC and at a liquid flowrate of 10(-3) m(3) min(-1) at both saturated steam conditions and in atmospheric environment with water subcooling in the range 0-75K. The experimental results fitted well to an existing dimensionless rewetting correlation, together with world available vapour environment rewetting data extending its validity down to the pressure of 1 bar Furthermore, the effect of the inlet water subcooling was introduced in to this correlation. (EN)

Scientific field

Nuclear Science & Technology (EN)

Engineering and Technology ▶ Mechanical Engineering
Nuclear Energy and Engineering (EN)

Subject

Subcooling (EN)

Cooling (EN)

Numerical analysis (EN)

Two phase flow (EN)

Wetting (EN)

Interfaces (computer) (EN)

Steam (EN)

Pressure (EN)