Abstract
• Visual studies of two loop heat pipes were conducted. • Visual studies were carried out by neutron radiography. • The loop heat pipes were made of stainless steel with a titanium wick. • Ammonia and methanol were used as working fluids. Neutron radiography was used to visually study the operation of two compact loop heat pipes (LHPs) having a similar configuration, made of stainless steel and equipped with a titanium wick. One was filled with ammonia and the other with methanol. The experimental setup made it possible to obtain a visual picture of the distribution and movement of a working fluid simultaneously in all the structural components of the LHPs. Unique data was obtained on the operation of the devices at three different orientations in the range of heat loads from 10 to 110 W, which allow to understand the features of their operation in more detail. Visual observations were supplemented by the results of thermal tests, which were presented in the form of heat load dependences of the temperature at the heating (thermal contact) surface of a heat source.
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