Frequency response experiments for a fluid and structure interaction system due to thermal striping in sodium

*; Ozawa, Kazumasa*; *; *

JNC TJ9440 99-016, 103 Pages, 1999/03

JNC-TJ9440-99-016.pdf:2.96MB

Thermal striping phenomena induced by the alternate flows of cold and hot sodium impinging against a horizontal test piece surface were investigated. The temperatures of sodium and structure material were measured simultaneously using thermocouples located various positions. From the present experiments, the following results have been obtained. (1)The alternate flows of cold and hot sodium with the frequency from 0.01Hz to 0.2Hz and the temperature difference of 240C were composed using the opening and closing operations of a cold and a hot sodium valve alternately. (2)The change and fluctuation of temperature amplitude in sodium decreases with decreasing of frequency component. (3)Amplitude component of temperature vibration decreased extremely in the structure material inside of the test piece than sodium. (4)Amplitude component of temperature vibration in the structure material increases in inverse proportion to decreasing of frequency component. (5)Amplitude component change of temperature vibration in the structure material decreases with decreasing of frequency component. (6)Fine fluctuations of temperature vibration in the structure material increases with increasing of frequency component, but it was limited near the surface of material. (7)Fine fluctuations of temperature vibration in the structure material decreases with decreasing of frequency component, but it was penetrated into the deep inner part of the material.