Deformation Analysis of Bubble near Curved Elastic Wall for Developing Shock Wave DDS

Autor:	Ichiro Yamanoi, Masaaki Tamagawa
Rok vydání:	2006
Předmět:	Fluid Flow and Transfer Processes Gas bubble Shock wave Materials science business.industry Wave propagation Minimum radius Mechanical Engineering Bubble Mechanics Curvature Physics::Fluid Dynamics Optics Shadowgraph Physical and Theoretical Chemistry Elasticity (economics) business
Zdroj:	JSME International Journal Series B. 49:755-760
ISSN:	1347-5371 1340-8054
DOI:	10.1299/jsmeb.49.755
Popis:	This paper describes a fundamental investigation of a new shock wave application in a drug delivery system (DDS) using a microcapsule including a single gas bubble. In this study, to design effective disintegrated microcapsule using a microjet, bubble deformation by shock waves near a curved elastic wall, which is the model of this microcapsule, is observed in an optical shadowgraph system using a high-speed camera and analyzed by image processing. The results show that a bubble compresses after shock wave propagation and the minimum radius of the bubble decreases with its distance to the model wall. During its expansion, a bubble near the wall extends locally and sharply, and then collapses. This deformation speed is estimated of microjet speed. Deformation speed has the peak against the initial bubble position from the wall, and can be controlled by changing the kind of bubble gas, the position of the initial bubble, and the elasticity and curvature of the wall. Therefore, it is found that changing these parameters a microcapsule can control the degree of its disintegration.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::7b2c0abcf16ab4f079efc88b1a8a1ff0 https://doi.org/10.1299/jsmeb.49.755 Zobrazit plný text záznamu