EXPERIMENTAL RESEARCH OF BOILING HEAT TRANSFER PHENOMENA ON METAL SURFACE IN STATE OF LOW GRAVITATIONAL ACCELERATION FIELD BETWEEN OG AND 1G

摘要

The paper deals with the characteristics of boiling heat transfer phenomena on the metal surfaces where gravitational acceleration between Og and lg acts. To conduct the experiment in the field where the gravitational acceleration between lg and Og acted accurately, we produced the Atwood machine that was able to obtain the fixed gravitational acceleration field known by physics well. The metallic materials used by the experiment were brass, stainless steel, aluminum, copper and these materials were processed to 10mm in the diameter, and we put these samples in liquid nitrogen and experimented on the boiling phenomenon.. As a result, it has been understood that there is the feature shown next in boiling heat transfer phenomena on the metal surface in gravitational acceleration field between Og and 1g. (1) When brass, copper, stainless steel, and aluminum of the sample were put in the liquid nitrogen, the temperature differentiation coefficient on the sample surface showed the tendency to decrease in proportion to gravitational acceleration changed from lg into Og. (2) In boiling heat flux curve in these metals (brass, stainless steel, aluminum and copper), it was clarified for gravitational acceleration lg to indicate maximum heat flux value q_(max).