Numerical modelling of acoustic pressure fields to optimize the ultrasonic cleaning technique for cylinders
Numerical modelling of acoustic pressure fields to optimize the ultrasonic cleaning technique for cylinders
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DOI：
10.1016/j.ultsonch.2018.02.045
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发表时间：
2018-07-01
影响因子：
8.4
通讯作者：
Wrobel, Luiz C.
中科院分区：
文献类型：
--
作者：
Lais, Habiba;Lowe, Premesh S.;Wrobel, Luiz C.
污垢堆积是海上工业中众所周知的问题。污垢的积累发生在不同的结构中，例如：海上管道、船体、浮式生产平台。积聚的污垢类型取决于结构本身周围的环境条件。目前用于清除污垢的方法涵盖水力、化学和手动，所有这些方法都有一个共同的缺点，即必须停止生产才能开始清洁过程。传统上，超声波在超声波浴中使用，通过在受污染的表面上产生空化气泡并使其内爆来清洁浸没的部件。该方法特别用于反渗透应用。然而，这需要浸没受污染的结构，因此可能需要停止生产。大型结垢结构（例如管道）可能无法容纳。这项工作中提出应用高功率超声波作为在运行时去除结构上的污垢的一种手段。本文介绍的工作包括基于内管壁上被方解石污染的管道的成功清洗结果开发有限元分析模型。本次调查中使用了 Polytec 3D 激光多普勒振动计来研究污垢去除过程。结果表明，高功率超声波在激励下通过结构中的波传播去除管道结构中的污垢的潜力，并用于验证 COMSOL 模型，以根据压力和位移分布确定清洁模式，以供未来换能器阵列设计和优化。
Fouling build up is a well-known problem in the offshore industry. Accumulation of fouling occurs in different structures, e.g. offshore pipes, ship hulls, floating production platforms. The type of fouling that accumulates is dependent on environmental conditions surrounding the structure itself. Current methods deployed for fouling removal span across hydraulic, chemical and manual, all sharing the common disadvantage of necessitating halting production for the cleaning process to commence. Conventionally, ultrasound is used in ultrasonic baths to clean a submerged component by the generation and implosion of cavitation bubbles on the fouled surface; this method is particularly used in Reverse Osmosis applications. However, this requires the submersion of the fouled structure and thus may require a halt to production. Large fouled structures such as pipelines may not be accommodated. The application of high power ultrasonics is proposed in this work as a means to remove fouling on a structure whilst in operation. The work presented in this paper consists of the development of a finite element analysis model based on successful cleaning results from a pipe fouled with calcite on the inner pipe wall. A Polytec 3D Laser Doppler Vibrometer was used in this investigation to study the fouling removal process. Results show the potential of high power ultrasonics for fouling removal in pipe structures from the wave propagation across the structure under excitation, and are used to validate a COMSOL model to determine cleaning patterns based on pressure and displacement distributions for future transducer array design and optimization.