Polyhedral array heat transfer tube
AssigneeOutokumpu Cooper Franklin Inc.
InventorsDonald L. Bennett, Liangyou Tang
Life of this patent
Estimating the term…
Abstract
A heat exchanger tube having an internal surface that is configured to enhance the heat transfer performance of the tube. The internal enhancement has a plurality of polyhedrons extending from the inner wall of the tubing. The polyhedrons have first and second planar faces disposed substantially parallel to the polyhedral axis. The polyhedrons have third and fourth faces disposed at an angle oblique to the longitudinal axis of the tube. The resulting surface increases the internal surface area of the tube and the turbulence characteristics of the surface, and thus, increases the heat transfer performance of the tube.
Claims16
A heat exchanger tube, comprising:
- a tubular member having an inner surface defining an inner diameter and having a longitudinal axis;
- and
- a 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.
A heat exchanger tube, comprising:
- a tubular member having an inner surface defining an inner diameter and having a longitudinal axis;
- a 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 0-40 degrees 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 β 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 S to the height of the polyhedron being about 0.1-0.6 mm.
A heat exchanger tube, comprising:
- a tubular member having an inner surface defining an inner diameter and having a longitudinal axis;
- and,
- a plurality of polyhedrons formed on the inner surface along at least one polyhedral axis, the at least one polyhedral axis being disposed at an angle of 0-40 degrees to the longitudinal axis, each of the polyhedrons having four opposite sides and a height, the polyhedrons having first and second opposed faces and third and fourth opposed faces, the third and fourth faces each disposed at an angle β 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 S to the height of the polyhedron being about 0.4-0.6, the third and fourth faces having a notch disposed therebetween, the notch extending into the inner surface, the polyhedrons disposed such that there are about 2,000 to 5,000 polyhedrons per square inch of tubing, and the polyhedrons having an apex angle between adjacent third and fourth faces of the polyhedrons that is about 20 to 50 degrees.
Dependencies are inferred from the claim text.