Patent ID: 6176301
Filing Date: 2001-01-23
Classification: F28F

Abstract:
A heat transfer tube for conveying a flow of a heat transfer substance in a flow direction, the heat transfer tube, comprising:a tubular member having an inner surface defining an inner diameter and having a longitudinal axis; anda plurality of polyhedrons formed on the inner surface, the polyhedrons having four sides which meet an outer surface, the polyhedrons disposed in polyhedral rows extending along said inner surface, the polyhedrons having first and second faces opposed to each other and extending substantially parallel to the polyhedral rows, the polyhedrons having third and fourth faces opposed to each other and disposed at an angle oblique to the polyhedral rows, the first, second, third and fourth faces meeting an outer face, and crack-like cavities on at least two faces of a polyhedron which cavities are not in the same geometric plane and which cavities enhance flow evaporation heat transfer, the third face of the polyhedron having at least one of the crack-like cavities and being disposed such that it is facing in the flow direction to enhance nucleation.