The influence of geometrical non-uniformities of heated surface on local heat transfer at boiling of liquid nitrogen at the presence of electric field was investigated. It is shown, that the creation of special areas on a heated surface - field traps - results in essential increase in local heat transfer coefficient. The field trap is an area on a heated surface in which the electric field opposes a departure of a bubble growing on a heated surface that results in the increase of growth time and departure diameter of a steam bubble. The special configuration of an electric field is created by variation of the surface geometrical features. Theoretical explanation of field trap effect was given. Influence of an electric field on average heat transfer coefficient was investigated in experiments on boiling on various surfaces.
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