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When a volcano erupts under the sea, the lava is quenched by the surrounding water. It is observed both in nature and industry. ![]() Quenching is a process in which rapid cooling occurs when a hot object is immersed in a coolant. In this study, film boiling during quenching was thoroughly observed and analyzed to explain the cause of enhancement in heat transfer efficiency. The average cooling time for quenching in the 0.5% CNF solution was 30.3% shorter than that in DI water. The cooling time was shortest when the cube was immersed in a 0.5% CNF solution for the first time. The time at which the heated copper cube convectively transferred heat to the surroundings was recorded. This was repeated with different copper cubes in each of the quenchants. A copper cube heated to greater than 600 ☌ was submerged three times in the quenchant. In this study, four copper cubes with the same dimensions and four different quenchants (deionized water and 0.01%, 0.1% and 0.5% CNF solutions) were prepared. The heat transfer performance of CNF solutions during boiling has been examined in several studies, but the quenching behavior of CNF solutions, which is an important heat transfer method, has not been evaluated. ![]()
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