A Study On The Simulation Of Fractal Floc Structure Based On Matlab

Solid/liquid separation is of crucial importance in the water treatment process.As a traditional separation method,flocculation/coagulation followed by sedimentation prevails nowadays.To improve the separation efficiency,it is necessary to study the floc structure.In this paper,fractal simulation is used to investigate the floc structure and its characteristic parameters.Computer simulation is an effective method to study the floc structure.With the popular software Matlab 7.1 as the development platform,the simulation has been carried out based on DLA floc growing model,when the initial diameter of floc partical presents as a normal distribution,then analyzed the fractal dimensionality and porosity.In this paper,two-dimensional DLA model is studied on the morphological structure,the fractal dimensionality,and the porosity of the resulting flocs.Further more,the changes of the fractal dimensionality,porosity with respect to the floc characteristic length are studied.And two-dimensional image has been compared by their fractal dimensionality.Comparing to it,when the initial particle diameter presents as other distributions,the fractal dimensionality of floc diminishes obviously as the number of particles increases.It has not too much different with the initial particle diameter presents as a equal distribution.As the porosity,the value of logarithmic normal distribution is nearest the natural situation,and the value is between 0.3 to 0.5.When we simulate,we think of the influence of the pseudo-random number. Because of the pseudo-random number,the particle diameters are not stochastic,but orderliness.And then we innovate the program,improve the precision of outcome..