Self-Excited Standing Wave Generated in Subcooled Boiling

抄録

An investigation is carried out on the self-excited standing wave which is frequently observed in a boiling channel when subcooled boiling occurs in it. At first, the properties of the self-excited standing wave are made clear experimentally, and then the mechanism of excitation of the standing wave is studied by introducing the effects of collapsing void. As the result, the following facts are found. The self-excited standing wave occurs only in the case of subcooled boiling. It is generated most easily when the heater is located at the loop of the pressure wave. Collapsing voids cause some phase lead in the variation of the exsisting void volume as compared with that in the case of the conservative system. Then the work done to the water column in the channel per cycle of vibration becomes positive and so the vibration grows.