研究目的
To verify whether the fouling removal technique based on leaky guided waves generated by quasi-axisymmetric excitation mode is effective and uniform for a pipe, with no byproduct produced during the removal process.
研究成果
The proposed method effectively and uniformly removes fouling with an 86.6% removal rate after 1 hour, as confirmed by mass analysis and SEM/EDS. It is environmentally friendly with no byproducts. The FEM simulations and experimental results align, showing double peak features at specific frequencies. The technique is suitable for large-scale descaling in pipelines.
研究不足
The study is limited to calcium carbonate fouling in a specific pipe size; different fouling substances may have varying adhesion strengths affecting removal efficiency. The method requires precise frequency control and may not be applicable to all pipeline materials or conditions without further optimization.
1：Experimental Design and Method Selection:
The study uses finite element method (FEM) simulations to model the acoustic field and determine optimal vibration frequency, combined with experimental validation. The method involves generating leaky ultrasonic guided waves (LUGWs) via quasi-axisymmetric excitation to induce cavitation in liquid for fouling removal.
2：Sample Selection and Data Sources:
A 100 cm long stainless steel pipe with calcium carbonate fouling prepared by heating and cooling supersaturated solution. Test points are set on the pipe wall for measurements.
3：List of Experimental Equipment and Materials:
Includes laser vibration analyzer, power amplifier, ultrasonic transducers, clamps, computer, function generator, optical measurement module, scanning electron microscope (SEM), energy-dispersive spectroscopy (EDS). Materials: Iron Alloy 304 pipe, PZT-5H piezoelectric material, aluminum base for transducers.
4：Experimental Procedures and Operational Workflow:
Transducers are fixed on the pipe wall; resonance frequency is measured; working frequency is selected; descaling is performed with 300 Vp-p signal at 42.539 kHz for 1 hour; mass and SEM/EDS analyses are conducted before and after removal.
5：539 kHz for 1 hour; mass and SEM/EDS analyses are conducted before and after removal.
Data Analysis Methods:
5. Data Analysis Methods: Displacement-frequency characteristics are analyzed using FEM and experimental data; removal rate is calculated based on mass loss; SEM and EDS are used for microstructural and compositional analysis.
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