Abstract
In order to use hot spot at cavitation bubble collapse for chemical reaction, luminescence at the collapse was carried out using a chemical luminescence analyzer. Hydrodynamic cavitation produced by injecting a high-speed water jet into a water filled chamber with cavitation bubble, i.e., a cavitating jet, was investigated. In the present paper, in order to find a suitable nozzle, intensity of luminescence produced by the cavitating jet at various nozzles was evaluated changing with injection pressure. The ultrasonic noise was also measured to evaluate aggressivity of the cavitating jet. The spectrum of the luminescence was evaluated to make clear mechanism of the luminescence. It was revealed that the spectrum of the luminescence induced by the cavitating jet was related to hydroxyl radical.
