Why Ultrasonic Cleaning Liquid Level Matters
Learn why ultrasonic cleaning liquid level affects cavitation, energy transfer, transducer load, and equipment life, and how proper level prevents failures.
Why Does Liquid Level Affect Ultrasonic Cavitation and Energy?
Ultrasonic transducers generate cavitation bubbles and transmit energy through the liquid. The liquid level affects:
• Liquid mass load
• Transducer impedance change
• Resonant frequency deviation
• Cavitation bubble density distribution
1. Liquid level too high
→ The cleaning liquid volume is too large, energy transmission becomes dispersed, and cleaning performance decreases.
2. Liquid level too low
→ The transducer operates under an overload condition, which may easily cause the transducer components to overheat and create a risk of equipment damage.
What Problems Can Occur When the Liquid Level Is Too High?
1. Energy Attenuation and Weaker Cleaning Power
• The total power emitted by the transducer is fixed. When the liquid volume increases, the energy distributed per unit volume decreases, resulting in insufficient sound field intensity.
2. Reduced Cavitation Density
• Insufficient effective sound energy per unit volume reduces the number of generated and collapsed cavitation bubbles, which are the main source of cleaning action.
3. Overflow Risk
• The liquid may overflow, contaminating the working environment and electrical components of the equipment.
4. Longer Cleaning Time
• Due to lower cleaning efficiency, a longer cleaning time is required to achieve the same cleaning result, which significantly reduces production efficiency.
What Problems Can Occur When the Liquid Level Is Too Low?
1. Transducer Overheating
Insufficient transducer heat dissipation: The cleaning liquid is not only the medium for ultrasonic transmission, but also the main heat sink during transducer operation.
• Piezoelectric ceramic temperature rise: Causes core piezoelectric ceramic performance to decline and accelerates aging.
• Adhesive delamination: The adhesive layer between the transducer and the tank may soften or detach due to excessive temperature, causing permanent damage.
• Generator burnout: In severe cases, it may reflect back to the ultrasonic generator as abnormal impedance, causing the generator circuit to overload or burn out.
2. Unstable Ultrasonic Output
• Insufficient load → power suddenly rises and falls.
3. Incomplete Cavitation
• If the liquid level is too shallow, bubble formation becomes uneven, resulting in incomplete cleaning.
Effect of Cleaning Solution Temperature on Liquid Level Evaporation
• Evaporation increases rapidly at 40–60°C.
• During long-term operation, the liquid level gradually decreases.
• The higher the temperature, the faster the water consumption rate.
• Evaporation affects concentration, causing the cleaning solution performance to decrease.
The liquid level in ultrasonic cleaning directly affects cavitation density, energy transmission, transducer load, and equipment service life.
If the liquid level is too high, the cleaning power will become weaker. If the liquid level is too low, the transducer may overheat or the generator may be damaged.
Maintaining the correct liquid level ensures stable cleaning quality and extends the service life of the equipment.
YONG JI Enterprise can provide optimal liquid level setting recommendations and safety protection designs according to different equipment models, helping customers maintain stable long-term cleaning performance.
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永技企業有限公司
YONG JI Enterprise Co., Ltd.
243新北市泰山區中港西路137-10號
No. 137-10, Zhonggang W. Rd., Taishan Dist., New Taipei City 243079, Taiwan (R.O.C.)
TEL: +886-2-2297-1195
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