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Two types of evaporators, specially developed for pumped two-phase fluid loop use, are illustratively described with drawings from which inner structures can clearly be seen. A significant difference between the two is such that evaporator exit vapors are usually wet in the first while always dry in the second. An outline of microgravity experiments, practiced for functional verifications of the two, is given along with observed inside views and measured temperatures. As a result of the experiments, necessity of suitable control in liquid supply is emphasized from an angle of normal operations. The void fraction, the temperature difference, and the pressure difference are proposed as an input signal for the flow rate control. The whole of microgravity experiments held again is explained with drawings of evaporator test loops, permitting any kind of control based on the above three, and also with figures displaying the temperature/pressure variations.