MEDIUM CIRCULATING APPARATUS

摘要

A medium circulating apparatus (1-1) of engine oil, which is a medium circulating through an internal combustion engine (100), includes a microbubble generator (4) that generates microbubbles and mixes the microbubbles into the circulating engine oil. Further, the medium circulating apparatus (1-1) includes a medium temperature acquiring unit (74) that acquires a temperature of the engine oil. The microbubbles are generated by the microbubble generator (4) when the temperature of the engine oil is less than or equal to a predetermined value in order to decrease a viscosity, a heat conductivity, and a heat capacity of the engine oil in which the microbubbles are mixed.