An Experimental and Theoretical £ Investigation of Annular Steam ...

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3. EXPERIMENTAL PART
The experimental part of this report is divided into three
sections. First is given a description of the experimental
equipment. The measuring procedures are then discussed in the
following section. Finally, the reported data are shown graphically
in the third section. Tabulations of the data are given
in Appendix.
The experiments were carried out with steam-water at 30,
50, 70 and 90 bar. The main properties of the medium are given
in table 3.1 (Schmidt (1969)).
3.1. Experimental Equipment
The experiments were carried out in the high pressure water
loop at the Risø National Laboratory during 1977.
The facility, installed in the Section of Experimental Heat
Transfer (SEHT), is shown in the schematic flow diagram fig.
3.1. It is constructed of stainless steel and dimensioned to a
critical pressure of 221 bar.
3.1.1. Main Loop Hydraulics
The main pump, built by Nikkiso Co. Ltd., feeds subcooled
water into the test section and spray condenser. Its main features
are:
Max. temperature 375 C
Max. pressure
Dynamic head
225 bar
150 m
Max. flow 15 1/s
Power
45 kW
The pump feeds water to the test section via two control
valves V2 and Vj. These valves regulate the flow rate and inlet
temperature to the test section. The control valves are operated
by compressed air and are regulated, via I/P (current to
pressure) converters, by PID (proportional-integral-differential)
regulators.
In the test section the steam is generated by means of up to
665 kW electrical power. The outlet temperature and thereby the