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618 2018 年 9 月

Disc-shapedcavitationstructure Smoker cavitation sturcture
(mm)
0.0100
0.0085
0.0070
0.0055
0.0040
0.0025
0.0010
-0.0010
-0.0025
-0.0040
-0.0055
-0.0070
-0.0085
-0.0100
Rod-shapedcavitationstructure Y-branch structure
(a) ቇӑፇ౞ᄊྲढ़Ћጉ(h=1.23mm) (b) ૱ᑟ٨ᣣ࠱᭧ᄊᰴࣀѬ࣋
图 3 换能器辐射面 (f = 20 kHz, d = 50 mm)
Fig. 3 Radiating surface of transducer (f = 20 kHz, d = 50 mm)

0 ms 2 ms 4 ms 8 ms

14 ms 24 ms 34 ms 42 ms
图 4 空化结构的初生过程 (f = 40 kHz, h = 1.01 mm)
Fig. 4 The inception of cavitation structures (f = 40 kHz, h = 1.01 mm)

10 mm

< 100 mm 0.18 mm 0.36 mm
图 5 空化结构随薄层厚度的变化 (f = 20 kHz)
Fig. 5 Cavitation structures as a function of liquid layer thickness (f = 20 kHz)

c
100 300
250
b 80
Ӵቇඋ/% 60 Ӵቇඋ/% 200 ʹሥ/mL
150
a 40 ʹሥ/ml
100
20
50
0 0
0 1 2 3 4 5
ᘙࡏԒए/mm
图 6 空化云体积和占空比随薄层厚度的变化 (f = 20 kHz)
Fig. 6 The volume and percentage of cloud region in the thin liquid layer (f = 20 kHz)