Details
| Original language | English |
|---|---|
| Article number | 8509107 |
| Pages (from-to) | 64622-64629 |
| Number of pages | 8 |
| Journal | IEEE ACCESS |
| Volume | 6 |
| Publication status | Published - 25 Oct 2018 |
Abstract
Ultrasonic cavitation shows a great potential in various industrial applications such as sonochemistry, food processing, ultrasonic cleaning, and surface treatments. These applications have the advantages of high temperatures or high pressure due to the collapse of cavitation bubbles. In surface treatments, the collapse of bubbles occurs near workpiece surfaces and creates micro-jets which lead to high impact forces. As one of these surface treatment processes, ultrasonic cavitation peening requires a small gap between the vibration source and the treated surface to obtain the maximum impact force. Due to these small gaps, the growth and collapse of cavitation bubbles are affected, which result in the changes of impact forces. Therefore, the investigation of the impact loads caused by ultrasonic cavitation bubbles in small gaps is the focus of this contribution. A theoretical model taking into consideration bubble interactions is utilized to estimate the optimal standoff distance at which the largest impact forces occur. Then, experimental investigations are carried out. A piezoelectric sensor with a titanium alloy cover is used to record the number of impacts and their amplitudes. The recorded signals are then processed in time and frequency domains. The experimental results show that large impact loads are generated when the gap width is in the range of 0.5-0.8 mm. It is also found that the maximum working efficiency occurs in this range.
Keywords
- Cavitation bubbles, Impact loads, Small standoff distance, Working efficiency
ASJC Scopus subject areas
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In: IEEE ACCESS, Vol. 6, 8509107, 25.10.2018, p. 64622-64629.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Investigation of Impact Loads Caused by Ultrasonic Cavitation Bubbles in Small Gaps
AU - Bai, Fushi
AU - Saalbach, Kai Alexander
AU - Wang, Liang
AU - Twiefel, Jens
N1 - Funding Information: This work was supported by the Open Access Fund of the Leibniz Universität Hannover.
PY - 2018/10/25
Y1 - 2018/10/25
N2 - Ultrasonic cavitation shows a great potential in various industrial applications such as sonochemistry, food processing, ultrasonic cleaning, and surface treatments. These applications have the advantages of high temperatures or high pressure due to the collapse of cavitation bubbles. In surface treatments, the collapse of bubbles occurs near workpiece surfaces and creates micro-jets which lead to high impact forces. As one of these surface treatment processes, ultrasonic cavitation peening requires a small gap between the vibration source and the treated surface to obtain the maximum impact force. Due to these small gaps, the growth and collapse of cavitation bubbles are affected, which result in the changes of impact forces. Therefore, the investigation of the impact loads caused by ultrasonic cavitation bubbles in small gaps is the focus of this contribution. A theoretical model taking into consideration bubble interactions is utilized to estimate the optimal standoff distance at which the largest impact forces occur. Then, experimental investigations are carried out. A piezoelectric sensor with a titanium alloy cover is used to record the number of impacts and their amplitudes. The recorded signals are then processed in time and frequency domains. The experimental results show that large impact loads are generated when the gap width is in the range of 0.5-0.8 mm. It is also found that the maximum working efficiency occurs in this range.
AB - Ultrasonic cavitation shows a great potential in various industrial applications such as sonochemistry, food processing, ultrasonic cleaning, and surface treatments. These applications have the advantages of high temperatures or high pressure due to the collapse of cavitation bubbles. In surface treatments, the collapse of bubbles occurs near workpiece surfaces and creates micro-jets which lead to high impact forces. As one of these surface treatment processes, ultrasonic cavitation peening requires a small gap between the vibration source and the treated surface to obtain the maximum impact force. Due to these small gaps, the growth and collapse of cavitation bubbles are affected, which result in the changes of impact forces. Therefore, the investigation of the impact loads caused by ultrasonic cavitation bubbles in small gaps is the focus of this contribution. A theoretical model taking into consideration bubble interactions is utilized to estimate the optimal standoff distance at which the largest impact forces occur. Then, experimental investigations are carried out. A piezoelectric sensor with a titanium alloy cover is used to record the number of impacts and their amplitudes. The recorded signals are then processed in time and frequency domains. The experimental results show that large impact loads are generated when the gap width is in the range of 0.5-0.8 mm. It is also found that the maximum working efficiency occurs in this range.
KW - Cavitation bubbles
KW - Impact loads
KW - Small standoff distance
KW - Working efficiency
UR - http://www.scopus.com/inward/record.url?scp=85055682695&partnerID=8YFLogxK
U2 - 10.1109/ACCESS.2018.2877799
DO - 10.1109/ACCESS.2018.2877799
M3 - Article
AN - SCOPUS:85055682695
VL - 6
SP - 64622
EP - 64629
JO - IEEE ACCESS
JF - IEEE ACCESS
SN - 2169-3536
M1 - 8509107
ER -