Surface Boiling of a Subcooled Liquid

If a cold liquid (below the boiling point) is caused to flow past a hot solid, subcooled boiling results. Because the boiling exists on the hot solid only, this is often called surface boiling. For the usual subcooled boiling, bubbles form on the hot solid in the manner observed for nucleate boiling. The bubbles then collapse while still on the solid, or they may break loose and collapse in the body of the cold, bulk liquid. 

Subcooled boiling is normally studied by means of electric heaters. The metal temperature is kept at a modest value to prevent burnout. 

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