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3559324 
Journal Article 
N-methylpyrrolidone and dowanol DPM as replacements for chlorinated solvents in ultrasonic cleaning 
Niemczewski, B 
2001 
1 
Transactions of the Institute of Metal Finishing
ISSN: 0020-2967
EISSN: 1745-9192 
79 
68-72 
WOS:000169518200018 
The intensity of cavitation and the intensity of movements of liquid under the influence of ultrasound radiation have been tested, in N-methylpyrrolidone (NPM) and in Dawanol DPM and for comparison purposes also in tetrachloroethylene and in chemically degassed water. The tests were carried out at four ultrasound frequencies: 27, 33, 37 and 60 kHz. A very high intensity of cavitation was found in NMP. The shapes of curves: cavitation vs. temperature and radiation pressure vs. temperature depend both on the power and frequency of the ultrasound. 
ultrasonic cleaning; cavitation; ultrasound radiation pressure; N-methylpyrrolidone; dipropylene glycol monomethyl ether (Dowanol; DPM); tetrachloroethylene