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热探针法测量超声场强度分布

DOI: 10.3969/j.issn.1006-7043.201108016

Keywords: 热探针, 超声场, 空化, 声强, 气泡云

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Abstract:

采用热探针法测量了探头式超声设备在纯水中的一维和二维声场强度分布,探究超声强化化工过程的机理.声场强度随着轴向和径向距离的增加而衰减,并满足声场的衰减方程.由于器壁的反射,在轴向和径向产生了驻波.通过构建二维声场强度分布图,考察了超声频率、超声电功率对声场强度分布的影响,并观测了超声探头下方形成的气泡云.结果表明,不同频率下,40 kHz下的声场强度高于30 kHz;同一频率下,超声电功率对声场强度的影响较小,探头下方气泡云的屏蔽作用是电功率影响较小的原因.

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