  We consider the simplified dielectric breakage model used for simulation of
the kinetics of cellular material breakage under the pulsed electric field
(PEF) treatment. The model is based on an effective media approximation, which
includes equations with the same morphology parameters as in percolation
theory. The probability of a whole cell breakage by the pulse with $t_{i}$
duration is estimated on the basis of electroporation theory. We account for
the bridging effect resulting from the deviations of the local conductivity
near the selected cell from the average effective media conductivity. The most
important feature of the proposed model is the existence of the ``jamming''
behaviour occurring sometimes in experimental observations of the biological
tissue breakage. The different transitions corresponding to the ``jamming''
steps are identified. The experimental results are obtained for thin apple
slices treated with electric pulses at field strengths $E=0.2-2.2$ kV
cm$^{-1}$, pulse durations $t_{i}=10-100$ $\mu$s, pulse repetition times
$t=10-100$ ms and the number of pulses $N=1-100000$. The model gives results
consistent in general with the experimental observations. We discuss the
correlation between the degree of cellular material destruction, field
strength, time of PEF treatment and power consumption.
