where K represents the amount of oil uptake when no water
remains in the fry (kg), qoil the density of the frying oil (kg/m3), A
the average pore surface area (m2), r the radius of the potato cylinder
(m) and oil0 is the amount of oil already taken up when the maximum evaporation rate is reached (g). Shrinkage of the potatoes
may be assumed to be negligible for the frying times used in the
experiments. For comparison, a simple linear
model is evaluated as well, assuming that the oil uptake is simply
proportional to the water loss, as proposed by