US5351397A — Method of forming a nucleate boiling surface by a…

Claim 1

Independent Claim 149 words

A method for forming a nucleate boiling surface on one side of a strip and an enhanced surface pattern on the opposite side, comprising: (a) roll forming a first pattern of grooves into a first side of said strip and an internal enhancement into the opposing side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end; (b) machining a second pattern of grooves into said fin ends to a depth of from about 10% to about 50% of the depth of said first pattern of grooves; and (c) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said second pattern of grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 2

Independent Claim 149 words

A method for forming a nucleate boiling surface on one side of a strip and an enhanced surface pattern on the opposite side, comprising: (a) roll forming a first pattern of grooves into a first side of said strip and an internal enhancement into the opposing side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end; (b) machining a second pattern of grooves into said fin ends to a depth of from about 10% to about 50% of the depth of said first pattern of grooves; and (c) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said second pattern of grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 3

Dependent Claim 15 words

The method of claim 1 wherein said internal enhancement is roll formed to a helix.

Claim 4

Dependent Claim 16 words

The method of claim 1 wherein said internal enhancement is roll formed to discrete roughness elements.

Claim 5

Dependent Claim 32 words

The method of claim 1 wherein said roll forming step includes embossing said first pattern of grooves in a double helix configuration with an angle of from about 5° to about 45°.

Claim 6

Dependent Claim 16 words

The method of claim 4 wherein said embossed angle is from about 10° to about 20°.

Claim 7

Dependent Claim 16 words

The method of claim 5 wherein said cross grooves are roll formed to a conical shape.

Claim 8

Dependent Claim 32 words

The method of claim 4 wherein said second pattern of grooves is machined to a depth of from about 20% to about 30% of the depth of said first pattern of grooves.

Claim 9

Dependent Claim 12 words

The method of claim 4 wherein said machining step comprises in-line milling.

Claim 10

Dependent Claim 18 words

The method of claim 8 including the additional step (d) of forming said strip into a welded tube.

Claim 11

Independent Claim 141 words

A method for forming a nucleate boiling surface on one side of a strip and an enhanced surface pattern on the opposite side, comprising: (a) in a single pass, roll forming the combination of a first pattern of grooves and cross grooves into a first side of said strip as well as an internal enhancement into the opposing side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end, said cross grooves intercepting said ridges at intervals along said fin end; and (b) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said cross grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 12

Independent Claim 141 words

A method for forming a nucleate boiling surface on one side of a strip and an enhanced surface pattern on the opposite side, comprising: (a) in a single pass, roll forming the combination of a first pattern of grooves and cross grooves into a first side of said strip as well as an internal enhancement into the opposing side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end, said cross grooves intercepting said ridges at intervals along said fin end; and (b) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said cross grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 13

Dependent Claim 15 words

The method of claim 10 wherein said internal enhancement is roll formed to a helix.

Claim 14

Dependent Claim 16 words

The method of claim 10 wherein said internal enhancement is roll formed to discrete roughness elements.

Claim 15

Dependent Claim 32 words

The method of claim 10 wherein said roll forming step includes embossing said first pattern of grooves in a double helix configuration with an angle of from about 5° to about 45°.

Claim 16

Dependent Claim 16 words

The method of claim 13 wherein said embossed angle is from about 10° to about 20°.

Claim 17

Dependent Claim 31 words

The method of claim 13 wherein said cross grooves are roll formed to a depth of from about 10% to about 50% of the depth of said first pattern of grooves.

Claim 18

Dependent Claim 31 words

The method of claim 15 wherein said cross grooves are roll formed to a depth of from about 20% of about 30% of the depth of said first pattern of grooves.

Claim 19

Dependent Claim 18 words

The method of claim 6 including the additional step (d) of forming said strip into a welded tube.

Claim 20

Independent Claim 130 words

A method for forming a nucleate boiling surface on at least one side of a strip, comprising: (a) roll forming a first pattern of grooves into a first side of said strip, said first pattern of grooves defining a plurality of ridges extending from said strip, said ridges having a base end integral with said strip and an opposing fin end; (b) machining a second pattern of grooves into said fin ends to a depth of from about 10% to about 50% of the depth of said first pattern of grooves; and (c) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said second pattern of grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 21

Independent Claim 130 words

A method for forming a nucleate boiling surface on at least one side of a strip, comprising: (a) roll forming a first pattern of grooves into a first side of said strip, said first pattern of grooves defining a plurality of ridges extending from said strip, said ridges having a base end integral with said strip and an opposing fin end; (b) machining a second pattern of grooves into said fin ends to a depth of from about 10% to about 50% of the depth of said first pattern of grooves; and (c) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said second pattern of grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 22

Dependent Claim 32 words

The method of claim 18 wherein said roll forming step includes embossing said first pattern of grooves in a double helix configuration with an angle of from about 5° to about 45°.

Claim 23

Dependent Claim 16 words

The method of claim 19 wherein said embossed angle is from about 10° to about 20°.

Claim 24

Dependent Claim 35 words

The method of claim 19 wherein embossing said first pattern of grooves defining the height of said plurality of ridges as up to about 80% of the thickness of the strip prior to roll forming.

Claim 25

Dependent Claim 37 words

The method of claim 21 wherein embossing said first pattern of grooves defines the height of said plurality of ridges as from about 25% to about 75% of the thickness of said strip prior to roll forming.

Claim 26

Dependent Claim 32 words

The method of claim 21 wherein said second pattern of grooves is machined to a depth of from about 20% to about 30% of the depth of said first pattern of grooves.

Claim 27

Dependent Claim 12 words

The method of claim 21 wherein said machining step comprises in-line milling.

Claim 28

Dependent Claim 18 words

The method of claim 24 including the additional step (d) of forming said strip into a welded tube.

Claim 29

Independent Claim 119 words

A method for forming a nucleate boiling surface on at least one side of a strip, comprising: (a) in a single pass, roll forming both a first pattern of grooves and cross grooves into a first side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end, said cross grooves intercepting said ridges at intervals along said fin end; and (b) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said cross grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 30

Independent Claim 119 words

A method for forming a nucleate boiling surface on at least one side of a strip, comprising: (a) in a single pass, roll forming both a first pattern of grooves and cross grooves into a first side of said strip, said first pattern of grooves defining a plurality of ridges extending substantially from said strip, said ridges having a base end integral with said strip and an opposing fin end, said cross grooves intercepting said ridges at intervals along said fin end; and (b) deforming said ridges so said fin ends extend over said first pattern of grooves forming a plurality of subsurface channels, concomitantly said cross grooves forming a pattern of surface pores opening into said subsurface channels.

Claim 31

Dependent Claim 32 words

The method of claim 26 wherein said roll forming step includes embossing said first pattern of grooves in a double helix configuration with an angle of from about 5° to about 45°.

Claim 32

Dependent Claim 16 words

The method of claim 27 wherein said embossed angle is from about 10° to about 20°.

Claim 33

Dependent Claim 31 words

The method of claim 27 wherein said cross grooves are roll formed to a depth of from about 10° to about 50° of the depth of said first pattern of grooves.

Claim 34

Dependent Claim 31 words

The method of claim 29 wherein said cross grooves are roll formed to a depth of from about 20% to about 30% of the depth of said first pattern of grooves.

Claim 35

Dependent Claim 17 words

The method of claim 29 wherein said cross grooves are roll formed with a knife edge base.

Claim 36

Dependent Claim 18 words

The method of claim 31 including the additional step (d) of forming said strip into a welded tube.

Annuity Stage	Window Opens	Payment Deadline	Surcharge Period Until	Estimated Fee	Status
3.5 Years (Year 4)	1997-10-03	1998-04-04	1998-10-04	$2000.00	Window Closed / Lapsed
7.5 Years (Year 8)	2001-10-03	2002-04-04	2002-10-04	$3760.00	Window Closed / Lapsed
11.5 Years (Year 12)	2005-10-03	2006-04-04	2006-10-04	$7700.00	Window Closed / Lapsed

Method of forming a nucleate boiling surface by a roll forming

Abstract

Inventors

Bibliographic Details

Claims Analysis

References Cited (Backward Citations)

USPTO Annuity & Maintenance Windows

Assigned Categories & Tags

Assign Category Tag