The relative Velocity, which for C is only slightly higher than for B as a result of the relatively slight differences in loading, means that the decreases in air temperature and thus the increases in humidity hardly differ over the whole length A differs noticeably from this. Here the higher residence time due to lower air and particle Velocity is dominant and in spite of lower
driving forces achieves material moisture comparable to that of B and C. As can be seen, the particle moistures are almost identical. taking account of their initial moistness.