HEAT-TRANSFER AGENT OF DROPWISE CONDENSATION HEAT EXCHANGER - RADIATOR Russian patent published in 1997 - IPC

FIELD: space engineering; cooling systems of space power plants. SUBSTANCE: heat-transfer agent contains substance which is liquid at maximum temperature of heat exchanger, for example, molten metal in which solid particles of substance are suspended; melting point of this substance is above above-mentioned temperature. This substance is not wettable with first substance within range of temperatures from this temperature to melting point of first substance, i.e. their contact angle is more than 90 deg. Heat- transfer agent is made from aluminium and contains particles of zirconium diboride, up to 40 mk in size; maximum working temperature is equal to 10 40 K. Densities of components of heat-transfer agent which are in liquid and solid phases differ by more than 5 percent at maximum working temperature. Coefficient of thermal radiation of solid particles exceeds similar parameter of other component of heat-transfer agent within working temperature range of heat exchanger-radiator. One of linear sizes of solid particle is more or less than other its sizes by two times, thus it has form of elongated rod or flattened plate. EFFECT: enhanced efficiency. 4 cl