G0600-5-4 高温面接触時の均一自発核生成発生の下限界温度(熱工学部門一般講演(5):伝熱(5))

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The lower limit for homogeneous nucleation boiling during liquid contact with hot surfaces has been determined by a new model proposed by the authors. In this model a characteristic liquid cluster is considered at the boundary in which bubble is generated due to external heating. A particular stage of bubble generation has been identified as the boiling explosion that corresponds to large scale vaporization when the energy consumption due to bubble generation in the cluster exceeds the external energy deposition to it. To calculate the rate of external energy deposition and boiling heat consumption in the liquid cluster, the ideas of 1-D heat conduction and molecular theory of homogeneous nucleation have been used. For water (20 ℃) contact with hot steel surfaces at atmospheric pressure, the model shows that immediate boiling explosion occurs for surface temperature above 335 ℃ while stable solid-liquid contact prevails during contact with surfaces at or below this temperature limit. The interface boundary temperature for stable solid-liquid contact as obtained in the present model corresponds to a value of 303℃ which is close to the thermodynamic limit of liquid superheat for water at atmospheric pressure. From the definition of interface boundary temperature of two constant temperature 1-D semi-infinite solids contact, this limit for homogeneous nucleation boiling explosion on brass and copper surfaces is also found to be an identical one.
一般社団法人日本機械学会の論文
2010-09-04

G0600-5-4 高温面接触時の均一自発核生成発生の下限界温度(熱工学部門一般講演(5):伝熱(5))

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