Abstract
1) Now, salt makers in Japan are generally using crystallizers with outside heater, which have two types, down-flow and up-flow, classified by brine flow in the evaporating chamber. 2) The down-flow type crystallizers are used usually, and recently the up-flow types are increasing owing to large-size products. 3) The size of products depend on the brine velocity in crystallizer. According to decreasing of velocity, crystals grow larger in the up-flow type crystallizer, and become smaller in the down-flow type. 4) I consider that crystals grow principally in the evaporating chamber, and so the size of products (salt) depend on the vertical velocity of brine in the evaporating chamber and the terminal velocity of salt particles. 5) The largest product is obtained when brine velocity is equal to the terminal velocity.
