Determination of Local Temperatures Caused by Acoustic Cavitation

A b s t r a c t By t h e u s e of c o m p a r a t i v e r a t e thermometry, w e have been a b l e t o d e t e r m i n e e x p e r i m e n t a l l y t h e e f f e c t i v e t e m p e r a t u r e c r e a t e d d u r i n g a c o u s t i c c a v i t a t i o n i n l i q u i d s. The sonochemical r e a c t i o n s of a s e r i e s of v o l a t i l e m e t a l c a r b o n y l s have been used a s chemical d o s i m e t e r s i n a l k a n e s o l v e n t s. We have e s t a b l i s h e d t h e e x i s t e n c e of and c o n d i t i o n s p r e s e n t i n 3 r e a c t i o n s i t e s d u r i n g a c o u s t i c c a v i t a t i o n : a g a s phase h o t-s p o t w i t h an e f f e c-t i v e t e m p e r a t u r e of 5200K and an e n v e l o p i n g , h e a t e d l i q u i d s h e l l w i t h an a v e r a g e e f f e c t i v e temp e r a t u r e o f-1900K. A s i m p l e c o n d u c t i …