Low heat flux film boiling in a pool is noted for its smooth and regularly wavy vapor-liquid interface. Bubbles form and depart in an orderly manner. As the heat flux is increased, film boiling with very vigorous bubble formation and departureappears. The bubbles are considerably larger than those in the low-flux case. The low and high heat flux film boiling, by their appearances, will be respectively referred to as the laminar and turbulent film boiling.Film boiling is also affected by the degree of subcooling. As the degree of subcooling increases, the vapor-liquid interface becomes more stable than that in saturated boiling and bubbles that depart from the interface are reduced in size quickly.
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