6Naderi K, Babadagli T. Effect of ultrasonic intensity and frequency on oil/heavy-oil recovery from different wettability rocks[R]. SPE 117324,2008.
7Hartmann J. On the production of acoustic waves by means of an air-jet of a velocity exceeding that of sound[J]. Philosophical Magazine, 1931,11(7) : 926-947.
8Alekseenko S V, Bilsky A V, Dulin V M, et al. Experimental study of an impinging jet with different swirl rates[J]. International Journal of Heat and Fluid Flow, 2007, 28(6):1340- 1359.
