Ultrasonic spectrometry and modelling that verifies shear-wave reconversion in micro- and nano-fluid

Derek Michael Forrester (1222806)

Francine Luppe (7129640)

J. Huang (2342368)

Valerie J. Pinfield (7128593)

English

Loughborough University Institutional Repository

Michael Forrester, J. Huang, V. J. Pinfield, F. LuppéREFERENCES1. D. M. Forrester et al. Experimental verification of nanofluid shear-wave reconversion in ultrasonic fields, Nanoscale, 8, 5497-5506 (2016).2. F. Luppé, J. M. Conoir, A. N. Norris. J. Acoust. Soc. Am. 131, 1113-20 (2012).ACKNOWLEDGEMENTS The authors thank Professor Malcolm Povey and Dr Melvin Holmes for use of the Ultrasizerspectrometer system at Leeds University, in the School of Food Science and Nutrition.Thanks are also extended to Nissan Chemical Industries for supplying Snowtex-ZL, withparticular gratitude to Takashi Sonoda. The authors acknowledge funding from the EPSRC,grant number EP/L018780/1.CONTACT INFORMATIONDepartment of Chemical Engineering Loughborough University Leicestershire LE11 3TU  UKD.M.Forrester@lboro.ac.uk  publications.lboro.ac.uk/publications/all/collated/phdmf.htmlAttenuation: 100nm diameter silica in waterFor technologically important nano-fluids, the effect is pronouncedAttenuation: 1 micrometre diameter silica in waterLloyd/Berry model does not include shear wave re-scatteringBlack dashed line: new shear mode reconversion modelConcentration: volume percentAttenuation: 430nm diameter silica in water1 micron case, there was fairly close agreement between modelsBUTAs particle size becomes smaller can we find shear wave effects?Yes, through the attenuation spectraTheoretical modelScattering coefficients: Effective wavenumber:Conclusions• As we move to the nanoscale we must include shear wave effects in analyses of suspensions using ultrasound• We have experimentally verified the phenomenon using two kinds of spectrometer• The model is very good at the frequencies examined (up to 25MHz)• We have focused on solid particles in suspension. Thermal waves also have a small effect.• Within the range of a few shear wavelengths complex coupled particle effects emerge• The shear effects are strongest near kSrequal to 1• Ultrasound can even penetrate the most opaque of samples and consider them in their entirety (without dilution as in light scattering techniques). • Thus, ultrasound spectrometry can be successfully employed for particle characterisationUltrasonic spectrometry and modelling that verifies shear-wave reconversion in micro-and nano-fluids

Ultrasonic spectrometry and modelling that verifies shear-wave reconversion in micro- and nano-fluids

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Ultrasonic spectrometry and modelling that verifies shear-wave reconversion in micro- and nano-fluids

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