Evaporation of the liquid methane from the metal surface

Introduction. At the emergency passages of a liquid methane on a soil there is its intensive boiling and the explosive situation is formed. At the passage on metal surfaces boiling happens in the film mode and boiling speed considerably exceeds boiling speed on a soil.
Methods. Calculation of rate of evaporation of a liquid methane is broken into two stages: the first stage — to value of numbers Fо < 0.5, when the surface can be considered thermally thick body, the second stage — for Fо і 0.5 in flesh to Fo* when temperature of a cold surface reaches value of the second critical Tcr2 » 160.56 K and comes to an end film boiling.
Results. Observation is confirmed, that the heat transfer coefficient at film boiling poorly depends on a temperature pressure and actually remains to constants during all process of film boiling. In this case at a thickness of a steel sheet dЈ2.5 mm, that corresponds to Bi Ј 0.1 of a leaf it is possible to consider thermally thin body. This circumstance is exposed calculations for Fо і 0.5. The dependence of mass of the evaporated liquid during film boiling is received and time of film boiling is defined.
Conclusions. The offered computational method of evaporation of a liquid methane from a metal surface is applicable for other couples cryogenic liquid – metal. At the same time it is necessary to consider change of thermal activity of metals (Срrl) with change of their temperature.

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