B125 Heat Transfer and Behavior of Bubble Generation on a Hydrophilic/Hydrophobic Surface in Subcooled Boiling

Abstract

Boiling heat transfer from a hydrophilic/hydrophobic combined surface was studied to examine the effect of the subcooling. The experiment was conducted at the subcooling of 30 K and its results were compared with previous data of the subcooling of 0, 10, 20 K. In subcooled conditions, boiling incipient superheat turns to a negative value and becomes lower with an increase in subcooling. The bubbles stay on the PTFE coating area without departure and maintain the hemispherical shape while oscillating up and down.