Abstract
Passively generated lateral motion of fluid during pool boiling on asymmetrically textured meso-scale structures is discussed in this Letter. The surface texture is in the form of 30°–60° mm-scale ratchets with re-entrant cavities located on the 30° face. High speed visualization of growing bubbles from cavities indicates growth and departure normal to the 30° face of the ratchets. A semi-empirical model of net axial liquid velocity due to the non-vertical bubble growth is developed and validated in a pool boiling experiment.
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