Write for the concentration of the chyme. The partial derivative measures the rate of change in the concentration with respect to time. As before, write for the velocity of the chyme (with its eddies). The equation modelling enhanced diffusion is
Write for the concentration of the chyme. The partial derivative measures the rate of change in the concentration with respect to time. As before, write for the velocity of the chyme (with its eddies). The equation modelling enhanced diffusion is