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The penetration of acoustic cavitation bubbles into micrometer-scale cavities

Title	The penetration of acoustic cavitation bubbles into micrometer-scale cavities
Author	Vaidya, H. A., Ertunç, Özgür, Lichtenegger, T., Delgado, A., Skupin, A.
Publication Date:	2016
Publication Place	- Elsevier
Subject	Acoustic cavitation, Ultrasound, Microvias, Mass transfer, Bubble dynamics
Type	Periodical
Language	English
Digital	Yes
Manuscript	No
Library:	Özyeğin University
Library Asset ID	0041-624X
Record ID	26937df0-0667-44c2-ae22-54ba78c9fe6e
Library Location	Mechanical Engineering
Date	2016
Notes	Due to copyright restrictions, the access to the full text of this article is only available via subscription.
Sample Text	The penetration of acoustically induced cavitation bubbles in micrometer-scale cavities is investigated experimentally by means of high-speed photography and acoustic measurements. Micrometer-scale cavities of different dimensions (width = 40 μm, 80 μm, 10 mm and depth = 50 μm) are designed to replicate the cross section of microvias in a PCB. The aim here is to present a method for enhancing mass transfer due to the penetration of bubbles in such narrow geometries under the action of ultrasound. The micrometer-scale cavities are placed in a test-cell filled with water and subjected to an ultrasound excitation at 75 kHz. A cavitation bubble cluster is generated at the mouth of the cavity which acts as a continuous source of bubbles that penetrate into the cavity. The radial oscillation characteristics and translation of these bubbles are investigated in detail here. It is observed that the bubbles arrange themselves into streamer-like structures inside the cavity. Parameters such as bubble population and size distribution and their correlation with the phase of the incident ultrasound radiation are investigated in detail here. This provides a valuable insight into the dynamics of bubbles in narrow confined spaces. Mass transfer investigations show that fresh liquid can be continuously introduced in the cavities under the action of ultrasound. Our findings may have important consequences in optimizing the filling processes for microvias with high aspect ratios.
DOI	10.1016/j.ultras.2015.12.009
Cilt	67

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The penetration of acoustic cavitation bubbles into micrometer-scale cavities

Author Vaidya, H. A., Ertunç, Özgür, Lichtenegger, T., Delgado, A., Skupin, A.

Publication Date 2016

Publication Place - Elsevier

Subject Acoustic cavitation, Ultrasound, Microvias, Mass transfer, Bubble dynamics

Type Periodical

Language English

Digital Yes

Manuscript No

Library Özyeğin University

Library Asset ID 0041-624X

Record ID 26937df0-0667-44c2-ae22-54ba78c9fe6e

Library Location Mechanical Engineering

Date 2016

Notes Due to copyright restrictions, the access to the full text of this article is only available via subscription.

Sample Text The penetration of acoustically induced cavitation bubbles in micrometer-scale cavities is investigated experimentally by means of high-speed photography and acoustic measurements. Micrometer-scale cavities of different dimensions (width = 40 μm, 80 μm, 10 mm and depth = 50 μm) are designed to replicate the cross section of microvias in a PCB. The aim here is to present a method for enhancing mass transfer due to the penetration of bubbles in such narrow geometries under the action of ultrasound. The micrometer-scale cavities are placed in a test-cell filled with water and subjected to an ultrasound excitation at 75 kHz. A cavitation bubble cluster is generated at the mouth of the cavity which acts as a continuous source of bubbles that penetrate into the cavity. The radial oscillation characteristics and translation of these bubbles are investigated in detail here. It is observed that the bubbles arrange themselves into streamer-like structures inside the cavity. Parameters such as bubble population and size distribution and their correlation with the phase of the incident ultrasound radiation are investigated in detail here. This provides a valuable insight into the dynamics of bubbles in narrow confined spaces. Mass transfer investigations show that fresh liquid can be continuously introduced in the cavities under the action of ultrasound. Our findings may have important consequences in optimizing the filling processes for microvias with high aspect ratios.

DOI 10.1016/j.ultras.2015.12.009

Cilt 67