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A heat transfer surface for a heat exchanger has a corrugated member having parallel spaced apart ridges and planar fin surfaces extending the ridges. Tabs are formed in the planar fin surfaces for forming counter-rotating vortices in the fluid flowing over the heat transfer surface, the tabs being

A heat transfer surface for a heat exchanger has a corrugated member having parallel spaced apart ridges and planar fin surfaces extending the ridges. Tabs are formed in the planar fin surfaces for forming counter-rotating vortices in the fluid flowing over the heat transfer surface, the tabs being lifted out of the surface of the planar fin surface and extending into or nesting within the openings formed by the corresponding tabs in the adjacent planar fin surface so as to achieve high fin density.

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1. A heat transfer surface for a heat exchanger comprising: a corrugated member having a plurality of parallel, spaced apart upper and lower ridges and planar fin surfaces extending therebetween;each corrugation of said corrugated member comprising either an upper or lower ridge and two planar fin s

1. A heat transfer surface for a heat exchanger comprising: a corrugated member having a plurality of parallel, spaced apart upper and lower ridges and planar fin surfaces extending therebetween;each corrugation of said corrugated member comprising either an upper or lower ridge and two planar fin surfaces extending from the corresponding upper or lower ridge;the planar fin surfaces being formed with a plurality of spaced apart tabs, each tab having one attached base and a free end projecting out of the plane of the corresponding planar fin surface, wherein the tabs are triangular, each said tab having a tip in the form of said free end;a plurality of triangular openings formed in the planar fin surfaces, the plurality of openings formed by the tabs projecting out of the planar fin surface;wherein the free ends of the tabs formed in one of the planar fin surfaces extend into the openings formed in an adjacent planar fin surface;wherein the free end of each said tab is attached to the planar fin surface only through said one attached base;wherein the heat transfer surface has a leading edge with respect to a direction of incoming flow defined by an end edge of the planar fin surfaces; andwherein the tip of each said tab is oriented toward the leading edge relative to the attached base. 2. The heat transfer surface as claimed in claim 1, wherein the planar fin surfaces are formed with a plurality of rows of spaced apart tabs, the rows extending along the length of the planar fin surface. 3. The heat transfer surface as claimed in claim 2, wherein adjacent rows of spaced apart tabs are staggered with respect to one another. 4. The heat transfer surface as claimed in claim 2, wherein the rows of spaced apart tabs are arranged in a cascading pattern. 5. The heat transfer surface as claimed in claim 1, wherein the free ends of the tabs formed in one planar fin surface project out of the plane of the planar fin surface in a first direction, the free ends of the tabs formed in an adjacent planar fin surface projecting out of the plane of the planar fin surface in the same first direction. 6. The heat transfer surface as claimed in claim 2, wherein the rows of spaced apart tabs each comprise a first set of tabs that project out of the plane of the planar fin surface in a first direction and a second set of tabs that project out of the planar fin surface in a second direction. 7. The heat transfer surface as claimed in claim 1, wherein the tabs have varying size. 8. The heat transfer surface a claimed in claim 1, wherein the tabs are arranged at varying angles with respect to the direction of incoming flow. 9. The heat transfer surface as claimed in claim 1, further comprising flow accelerating features formed in the planar fin surface intermediate the spaced-apart tabs, wherein the flow accelerating features comprise rounded protrusions formed between the spaced apart tabs proximal to the attached base. 10. The heat transfer surface as claimed in claim 1, wherein the planar fin surfaces are one of the following alternatives: parallel to one another or inclined with respect to one another. 11. The heat transfer surface as claimed in claim 1, wherein the upper and lower ridges are one of the following alternatives: rounded or generally flat surfaces. 12. The heat transfer surface as claimed in claim 1, wherein said heat transfer surface is arranged within enclosed tubular members for the flow of a fluid therethrough. 13. A heat exchanger comprising: a plurality of stacked tubular members extending in spaced apart generally parallel relationship;a first set of fluid flow passages defined by said plurality of stacked tubular members;a second set of fluid flow passages formed between adjacent tubular members;a pair of inlet and outlet manifolds in communication with said first set of fluid flow passages;a plurality of heat transfer surfaces disposed in said second set of fluid passages between adjacent tubular members;each of said heat transfer surfaces comprising: a corrugated member having a plurality of parallel, spaced apart upper and lower ridges and planar fin surfaces extending therebetween;each corrugation of said corrugated member comprising either an upper or lower ridge and two planar fin surfaces extending from the corresponding upper or lower ridge;the planar fin surfaces being formed with a plurality of spaced apart tabs, each tab having one attached base and a free end projecting out of the plane of the corresponding planar fin surface, wherein the tabs are triangular, each said tab having a tip in the form of said free end;a plurality of triangular openings formed in the planar fin surfaces, the plurality of openings formed by the tabs projecting out of the planar fin surface;the free ends of the tabs formed in one of the planar fin surfaces extending into the openings formed in an adjacent planar fin surface;wherein the free end of each said tab is attached to the planar fin surface only through said one attached base;wherein the heat transfer surface has a leading edge with respect to a direction of incoming flow defined by an end edge of the planar fin surfaces; andwherein the tip of each said tab is oriented toward the leading edge relative to the attached base. 14. The heat exchanger as claimed in claim 13, wherein the heat transfer surface is bi-directional such that each planar fin surface comprises a first portion wherein the tabs are formed with their free end oriented toward the leading edge relative to the attached base, and a second portion wherein the tabs are formed with their free end oriented toward a second leading edge relative to the attached base. 15. The heat exchanger as claimed in claim 13, wherein the planar fin surfaces are formed with a plurality of rows of spaced apart tabs, the rows extending along the length of the planar fin surface; and wherein the rows of spaced apart tabs each comprise a first set of tabs that project out of the plane of the planar fin surface in a first direction and a second set of tabs that project out of the planar fin surface in a second direction thereby forming an alternating pattern along the length of the planar fin surface.