Ultrasonic monitoring device and method for nano-particle aggregation in non-Newtonian base-liquid fluid

Abstract

The invention discloses an ultrasonic monitoring device and method for nano-particle aggregation in a non-Newtonian base-liquid fluid. The ultrasonic monitoring device comprises a sample cell and a straight ultrasonic probe, wherein a fluid transportation groove used for placing a nanometer solution is formed in the sample cell, a reflecting plate is arranged in the fluid transportation groove, the straight ultrasonic probe is used for emitting ultrasonic pulses to the reflecting plate in the fluid transportation groove and receiving reflected waves reflected by the reflecting plate, the straight ultrasonic probe is connected to a data acquisition and processing system through an ultrasonic pulse transmitting and receiving device, and the reflected waves are sent to the data acquisition and processing system through the ultrasonic pulse transmitting and receiving device to carry out data processing. By adopting the method, characteristic parameters of average radiuses of particle clusters in the nanometer solution and displacements of the particle clusters in unit time can be obtained, fractal dimensions of a random walk approach in a fractal structure of the nanometer solution and the weights of particles with different particle diameters in all nano-particles are monitored in real time, so that sound attenuation coefficients of particle phases in a solid-liquid two-phase flow are accurately measured to realize fast on-line monitoring.

Description

【Technical field】 [0001] The invention belongs to the technical field of nondestructive testing, and in particular relates to an ultrasonic monitoring device and method for the agglomeration phenomenon of nanoparticles in a non-Newtonian base fluid in a flowing state. 【Background technique】 [0002] At present, the mainstream methods for observing the diffusion behavior of particles in nano-solutions are all based on the principle of laser speckle method. Due to the limited penetration ability of these methods, samples need to be sampled and diluted for measurement, which is not suitable for online measurement at high concentrations. Moreover, the requirements for the optical path equipment are relatively high, there are large errors in the measurement, and the post-processing of the obtained data and images is difficult. In addition, there are many other methods, but the shortcomings of these methods mainly exist in two aspects: one is that they can only be used under static...

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Problems solved by technology

[0002] At present, the mainstream methods for observing the diffusion behavior of particles in nano-solutions are all based on the principle of laser speckle method. Due to the limited penetration ability of these methods, samples need to be sampled and diluted for measurement, which is not suitable for online measurement at high concentrations. Moreover, the requirements for the optical path equipment are relatively high, there are large errors in the measurement, and the post-processing of the obtained data and images is difficult. In addition, there are many other methods, but the shortcomings of these methods mainly exist in two aspects: one is that they can only be used under static conditions. The observation of nanoparticle diffusion in non-Newtonian fluids does not take into account the influence of fluid flow on particle mass transfer. Second, during the observation process, direct contact with the base fluid of non-Newtonian fluids has an unavoidable impact on the observation results

[0003] Nanoparticles in the non-Newtonian fluid flow field have a series of unique basic phenomena such as transport, diffusion, clusters, and interaction with solid boundaries, and contact observation and measurement can easily prompt non-Newtonian fluids to exhibit tube flow shear during transport. Phenomena such as shear thinning, stress relaxation, creep, hysteresis, residual stress, viscoelastic recovery, and slip will inevitably have an important impact on nanoparticles in the flow field. The existing literature includes French Paris Pierre and Professor Michael Baudoin of the Jean Le Rond D'Alembert International Joint Laboratory of Marie Curie University and others studied that when the acoustic shock wave propagates in the nanoparticle suspension, the change of the concentration of the suspension and the change of the flow velocity between the particle and the liquid will cause the acoustic scattering field Su Mingxu of Shanghai University of Science and Technology used high-frequency broadband ultrasonic attenuation spectrum to characterize the particle size of nanoparticles; Xu Chunguang and Yan Hongjuan of Beijing Institute of Technology provided an ultrasonic array detection method for high-precision multiphase fluid density and concentration and particle size, etc. , and there is no monitoring method about how to use an ultrasonic measuring device to measure the fractal dimension of the random walk path of the nanoparticle fractal structure in the non-Newtonian base fluid and the weights of particles with different particle sizes in all nanoparticles. The present invention facilitates Considering the defects of the above-mentioned methods, a method that can be widely used in the research and practical application of nano-solutions is proposed.

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