INTERPARTICLE COLLISIONS DRIVEN BY ULTRASOUND

被引：514

作者：

DOKTYCZ, SJ ^{[1
]}

SUSLICK, KS ^{[1
]}

机构：

[1] UNIV ILLINOIS,SCH CHEM SCI,URBANA,IL 61801

来源：

SCIENCE | 1990年 / 247卷 / 4946期

关键词：

D O I：

10.1126/science.2309118

中图分类号：

O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];

学科分类号：

07 ; 0710 ; 09 ;

摘要：

Ultrasound has become an important synthetic tool in liquid-solid chemical reactions, but the origins of the observed enhancements remained unknown. The effects of high-intensity ultrasound on solid-liquid slurries were examined. Turbulent flow and shock waves produced by acoustic cavitation were found to drive metal particles together at sufficiently high velocities to induce melting upon collision. A series of transition-metal powders were used to probe the maximum temperatures and speeds reached during such interparticle collisions. Metal particles that were irradiated in hydrocarbon liquids with ultrasound underwent collisions at roughly half the speed of sound and generated localized effective temperatures between 2600°C and 3400°C at the point of impact for particles with an average diameter of ∼10 μm.

引用

页码：1067 / 1069

页数：3