Abstract
The development of space is a great dream left to mankind. More than 30 years have passed since the world's first satellite was launched. Now, international telephone communication can be made via comsats and the image of clouds can be seen on television and in newspapers thanks to through a meterological satellites. As the power output of satellites and spacecraft increases, a thermal control system must be considerd for the recovery, transport, and disposal of waste heat. The change of phase of the working fluid results in lower electrical power requirements to operate pumps and gives a relatively isothermal sink temperature. Various system designs must be made to accomplish this two-phase thermal management capability. However, there is only little information available on two-phase flow pressure drop and heat transfer in reduced gravity environments. Here, the present status of investigation into two-phase flow in micro-gravity environments is introduced, with an emphasis especially on flow pattern.
