TRANSVERSE DISPERSION AT HIGH PECLET NUMBERS IN SHORT POROUS-MEDIA

Transverse dispersion is examined in short ceramic foams for a variety of pore sizes and flow rates. Experiments were performed with a local ized smoke source as a tracer and a coflow of air. Digital images were taken of the resulting dispersion patterns, and an approximate transv erse dispersion coefficient was determined. A precise dispersion coeff icient cannot be defined at these high Peclet numbers (10(6)-10(8)) be cause the dispersion becomes non-Fickian. Nevertheless, the approximat e coefficients are shown to be consistent with the values obtained by other researchers for lower Peclet numbers and longer porous media.