Patent ID: 6182743
Filing Date: 2001-02-06
Classification: F28F

Abstract:
A heat exchanger 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 along at least one polyhedral axis, the at least one polyhedral axis disposed at an angle of about 0-40 degrees with respect to the longitudinal axis, each of the polyhedrons having four opposite sides and a height, the polyhedrons having first and second faces opposed to each other, the polyhedrons having third and fourth faces opposed and inclined to each other and disposed at an angle of 5-14 degrees to the polyhedral axis, the polyhedrons defining a space between adjacent polyhedrons having a cross-sectional area (S), the ratio of the cross-sectional area to the height being 0.1 mm to 0.6 mm, the polyhedrons disposed such that there are about 2,000 to 5,000 polyhedrons per square inch of tubing, the polyhedrons having an apex angle between adjacent third and fourth faces of the polyhedrons that is about 20 to 50 degrees.