Abstract
An active heat spreader is an oscillation-type heat pipe that is a closed meandering pipe with two bubble pumps at the both ends and with several heating and cooling sections on the way of one, in which a working fluid is charged adequately. In the present paper, the prototype device was built and tested for checking the operation. As a result, in he case of AHS with single-tube-type bubble pumps, the fluid is awkward in it's movement and it can not transport heat from the heating section to the cooling sections, but AHS with double-tube-type bubble pumps can transport heat well, although the periodical fluctuation of the temperature on the heating wall is appeared.
