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Doctoral Thesis
Full name
Cristhiane Assenhaimer
Knowledge Area
Date of Defense
São Paulo, 2015
Guardani, Roberto (President)
Bresciani, Antonio Esio
Giudici, Reinaldo
Petri, Denise Freitas Siqueira
Sayer, Claudia
Title in English
Evaluation of emulsion destabilization by light scattering applied to metalworking fluids.
Keywords in English
Droplet size distribution
Metalworking fluids
Neural networks
Spectroscopic sensor
Abstract in English
Monitoring of emulsion properties is important in many applications, like in foods and pharmaceutical products, or in emulsion polymerization processes, since aged and broken emulsions perform worse and may affect product quality. In machining processes, special types of emulsions called metalworking fluids (MWF) are widely used, because of its combined characteristics of cooling and lubrication, increasing the productivity, enabling the use of higher cutting speeds, decreasing the amount of power consumed and increasing tool life. Even though emulsion quality monitoring is a key issue in manufacturing processes, traditional methods are far from accurate and generally fail in providing the tools for determining the optimal useful life of these emulsions, with high impact in costs. The present study is dedicated to the application of a spectroscopic sensor to monitor MWF emulsion destabilization, which is related to changes in its droplet size distribution. Rapeseed oil emulsions, artificially aged MWF and MWF in machining application were evaluated, using optical measurements and multivariate calibration by neural networks, for developing a new method for emulsion destabilization monitoring. The technique has shown good accuracy in rebuilding the droplet size distribution of emulsions for monomodal and bimodal distributions and different proportions of each droplet population, from the spectroscopic measurements, indicating the viability of this method for monitoring such emulsions. This study is part of a joint project between the University of São Paulo and the University of Bremen, within the BRAGECRIM program (Brazilian German Cooperative Research Initiative in Manufacturing) and is financially supported by FAPESP, CAPES, FINEP and CNPq (Brazil), and DFG (Germany).
Title in Portuguese
Avaliação da desestabilização deemulsões por espalhamento de luz, aplicada a fluídos de corte.
Keywords in Portuguese
Distribuição de tamanho de gotas
Fluídos de corte
Redes neurais
Abstract in Portuguese
Sem resumo em português.
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Publishing Date
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  • Assenhaimer, C., et al. Use of a spectroscopic sensor to monitor droplet size distribution in emulsions using neural networks [doi:10.1002/cjce.21861]. Canadian Journal of Chemical Engineering [online], 2013, p. n/a-n/a.
  • GLASSE, B., et al. Analysis of the Stability of Metal Working Fluid Emulsions by Turbidity Spectra [doi:10.1002/ceat.201200590]. Chemical Engineering & Technology [online], 2013, vol. 36, p. n/a-n/a.
  • Assenhaimer, C., et al. Use of a spectroscopic sensor to monitor emulsion stability based on turbidity spectra. In COBEQ - Congresso Brasileiro de Engenharia Química, Búzios RJ, 2012. Anais do 19 COBEQ - Congresso Brasileiro de Engenharia Química., 2012.
  • Assenhaimer, C., et al. Uso da Espectroscopia UV-Visível para Estimar a Distribuição de Tamanho de Gotas em Emulsões Oleosas. In ENEMP - Congresso Brasileiro de Sistemas Particulados, Vassouras RJ, 2011. Anais do 35. ENEMP - Congresso Brasileiro de Sistemas Particulados., 2011.
  • Assenhaimer, C., et al. Uso de um sensor espectroscópico para monitorar emulsões de fluidos de corte usando redes neurais. In Usinagem-2012 Feira e Congresso, São Paulo SP, 2012. Anais da 7a. Feira e Congresso Usinagem 2012., 2012.
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