Correlation theory of stationary random functions was used to study the effect of small porosity fluctuations (permeability) on filtration. Coefficients of internal heat transfer and convective dispersion are calculated on the assumption of the functional dependence of the Sherwood or the Nusselt numbers on the Reynolds numbers under the conditions of the binominal filtration law validity. Calculation dependences and experimental data of the Declet number on the Reynolds number for radial and axial dispersion coefficients are presented.