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Based on hydrodynamics, the pressure of the liquid outside an aspheric encapsulated bubble driven by ultrasound is studied, and its analytical expression is derived. Numerical simulation shows that 1) the aspheric shape of an encapsulated bubble makes little influence on the pressure of the liquid far away from the bubble; 2) the pressure is extremely high at some local places of the liquid near an aspheric encapsulated bubble, and the pressure values at these places are apparently larger than those for a spherical encapsulated bubble at the same conditions. This phenomenon is of significance in the applications such as high intensity ultrasound therapy, drug delivery, cell membrane perforation, etc. As the ultrasound frequency shifts to the resonance frequency of an encapsulated bubble, or bubble shape deviates from sphericity, the localized high pressure becomes even greater.
[1] van der Meer S M, Dollet B, Voormolen M M, Chin C T, Bouakaz A, de Jong N, Versluis M, Lohse D 2007 J. Acoust. Soc. Am. 121 648
[2] Wu J R, Ross J R, Chiu J F 2002 J. Acoust. Soc. Am. 111 1460
[3] Unger E C, Porter T, Culp W, Labell R, Matsunaga T, Zutshi R 2004 Adv. Drug. Del. Rev. 56 1291
[4] Chetty K, Stride E, Sennoga C A, Hajnal J V, Eckersley R J 2008 IEEE Trans. Ultrason. Ferroelectr. Frequency Control 55 1333
[5] Liang J F, Chen W Z, Shao W H, Zhou C, Du L F, Jin L F 2013 Acta Phys. Sin. 62 084708 (in Chinese) [梁金福, 陈伟中, 邵纬航, 周超, 杜联芳, 金利芳 2013 物理学报 62 084708]
[6] Church C C 1995 J. Acoust. Soc. Am. 97 1510
[7] Marmottant P, van der Meer S M, Versluis M, de Jong N, Hilgenfeldt, Lohse D 2005 J. Acoust. Soc. Am. 118 3499
[8] Doinikov A A, Dayton P A 2007 J. Acoust. Soc. Am. 121 3331
[9] Zhang A M, Yao X L, Li J 2008 Acta Phys. Sin. 57 1672 (in Chinese) [张阿漫, 姚熊亮, 李佳 2008 物理学报 57 1672]
[10] Zhang A M, Yao X L 2008 Acta Phys. Sin. 57 1662 (in Chinese) [张阿漫, 姚熊亮 2008 物理学报 57 1662]
[11] Zhang A M, Yao X L 2008 Chin. Phys. B 17 927
[12] Shao W H, Chen W Z 2013 J. Acoust. Soc. Am. 133 119
[13] Wang W J, Chen W Z, Lu M J, Wei R J 2003 J. Acoust. Soc. Am. 114 1898
[14] Krasovitski B, Kimmel E 2006 Ultrasonics 44 216
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[1] van der Meer S M, Dollet B, Voormolen M M, Chin C T, Bouakaz A, de Jong N, Versluis M, Lohse D 2007 J. Acoust. Soc. Am. 121 648
[2] Wu J R, Ross J R, Chiu J F 2002 J. Acoust. Soc. Am. 111 1460
[3] Unger E C, Porter T, Culp W, Labell R, Matsunaga T, Zutshi R 2004 Adv. Drug. Del. Rev. 56 1291
[4] Chetty K, Stride E, Sennoga C A, Hajnal J V, Eckersley R J 2008 IEEE Trans. Ultrason. Ferroelectr. Frequency Control 55 1333
[5] Liang J F, Chen W Z, Shao W H, Zhou C, Du L F, Jin L F 2013 Acta Phys. Sin. 62 084708 (in Chinese) [梁金福, 陈伟中, 邵纬航, 周超, 杜联芳, 金利芳 2013 物理学报 62 084708]
[6] Church C C 1995 J. Acoust. Soc. Am. 97 1510
[7] Marmottant P, van der Meer S M, Versluis M, de Jong N, Hilgenfeldt, Lohse D 2005 J. Acoust. Soc. Am. 118 3499
[8] Doinikov A A, Dayton P A 2007 J. Acoust. Soc. Am. 121 3331
[9] Zhang A M, Yao X L, Li J 2008 Acta Phys. Sin. 57 1672 (in Chinese) [张阿漫, 姚熊亮, 李佳 2008 物理学报 57 1672]
[10] Zhang A M, Yao X L 2008 Acta Phys. Sin. 57 1662 (in Chinese) [张阿漫, 姚熊亮 2008 物理学报 57 1662]
[11] Zhang A M, Yao X L 2008 Chin. Phys. B 17 927
[12] Shao W H, Chen W Z 2013 J. Acoust. Soc. Am. 133 119
[13] Wang W J, Chen W Z, Lu M J, Wei R J 2003 J. Acoust. Soc. Am. 114 1898
[14] Krasovitski B, Kimmel E 2006 Ultrasonics 44 216
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