Correlation of Volume Ratio and Normalized Permittivity in Particle Mixture

The volume ratio in the total solid particle mixture is an important parameter indicating the characteristics of particulate mixtures. Therefore, a simple measurement method is desirable. In this paper, the normalized permittivities of two groups of particle mixtures are tested using electrical capacitance tomography (ECT) with the series and parallel models. The experimental results show that normalized permittivity changes obtained from the series ECT model have a very strong linear relationship with the volume ratio of higher permittivity materials in the mixture. The Maxwell Garnett formula can predict the normalized permittivity only after the permittivity of each type of particle is known. The comparison between two methods suggests that ECT with the series model is a better way to monitor the volume ratio in mixtures comprising two different types of solid particle.

[1]  Lorenz Ratke,et al.  In-Situ Optical Determination of Fraction Solid , 2004 .

[2]  Vivek V. Ranade,et al.  Void fraction measurement using electrical capacitance tomography and high speed photography , 2015 .

[3]  Filippo Capolino,et al.  Theory and Phenomena of Metamaterials , 2009 .

[4]  Sankaran Sundaresan,et al.  Electrical capacitance tomography measurements on vertical and inclined pneumatic conveying of granular solids , 2003 .

[5]  L. Pires,et al.  Computed Tomography to Estimate the Representative Elementary Area for Soil Porosity Measurements , 2012, TheScientificWorldJournal.

[6]  Thomas Musch,et al.  Evaluation of a concept for density measurement of solid particle flows in pneumatic conveying systems with microwaves (8-12 GHz) , 2011 .

[7]  Wuqiang Yang,et al.  Application of electrical capacitance tomography in particulate process measurement – A review , 2014 .

[8]  Wuqiang Yang,et al.  Design of electrical capacitance tomography sensors , 2010 .

[9]  Yi Li,et al.  Gas/oil/water flow measurement by electrical capacitance tomography , 2012, 2012 IEEE International Conference on Imaging Systems and Techniques Proceedings.

[10]  Wuqiang Yang,et al.  An Improved Normalisation Approach for Electrical Capacitance Tomography , 1999 .

[11]  Robert Banasiak,et al.  Study on two-phase flow regime visualization and identification using 3D electrical capacitance tomography and fuzzy-logic classification , 2014 .

[12]  Jiangtao Sun,et al.  Fringe effect of electrical capacitance and resistance tomography sensors , 2013 .

[13]  Lihui Peng,et al.  A novel multi-electrode sensing strategy for electrical capacitance tomography with ultra-low dynamic range , 2017 .

[14]  Shridhar Hegde,et al.  A novel approach to determine solid fraction using a laser-based direct volume measurement device , 2014, Pharmaceutical development and technology.

[15]  Wuqiang Yang,et al.  Scale-up of an electrical capacitance tomography sensor for imaging pharmaceutical fluidized beds and validation by computational fluid dynamics , 2011 .