HEAT TRANSFER AUGMENTED FLUID FLOW SURFACES

• US 20120017605A1
• Filed: 07/22/2011
• Published: 01/26/2012
• Est. Priority Date: 07/23/2010
• Status: Active Grant

• Current Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Original Assignee: University of Central Florida Research Foundation Inc. (State University System of Florida)
• Inventors: SLABAUGH, CARSON D., KAPAT, JAYANTA S.
• Granted Patent: US 9,376,960 B2
• Time in Patent Office: Days
• US Class Current: 60/806
• CPC Class Codes: F02C 7/141 of working fluid
• CPC Class Codes: F05D 2250/611 undulated
• CPC Class Codes: F05D 2260/20 Heat transfer, e.g. cooling
• CPC Class Codes: F05D 2260/2214 by increasing the heat transfer surface
• CPC Class Codes: F28F 13/12 by creating turbulence, e.g. by stirring, by increasing the force of circulation F28F13/08 takes precedence
• CPC Class Codes: F28F 3/04 the means being integral with the element
• CPC Class Codes: F28F 3/044 the deformations being pontual, e.g. dimples

Abstract

A heat transfer augmented channel wall includes a bulk portion, a wall surface and a plurality of multi-portion indented features extending from the wall surface into the bulk portion. The multi-portion indented features include a first indented portion and a second indented portion that are divided by a ridge which disrupts fluid flow between first and second indented portions. The ridge has a height that is less than a maximum depth of the multi-portion indented features.

Claims

1. A heat transfer augmented channel wall, comprising:

a bulk portion;

an wall surface, and

a plurality of multi-portion indented features extending from said wall surface into said bulk portion,

wherein said multi-portion indented features each comprise;

a first indented portion, and

at least a second indented portion,

wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and

wherein said ridge has a height that is less than a depth of said multi-portion indented features.

2. The channel wall of claim 1, wherein said first and second indented portions both have a semispherical shape.

3. The channel wall of claim 1, wherein said channel wall comprises a thermally conductive material, and wherein said first indented portion comprises a first rim wherein said first rim comprises a first intersection of said first indented portion and said wall surface, said first rim having a first circular profile comprising a first radius and a first midpoint, wherein said second indented portion comprising a second rim wherein said rim comprises a second intersection of said second indented portion and said wall surface, said second rim has a second circular profile comprising a second radius and a second midpoint, said first midpoint and said second midpoint comprising a distance apart less than a sum of said first radius and said second radius, said distance apart being greater than zero.

4. The channel wall of claim 3, wherein said first radius and said second radius are substantially equal.

5. The channel wall of claim 1, wherein said channel wall is part of a duct including a bottom wall, a side wall and a top wall, said channel wall being said bottom wall, and wherein said plurality of multi-portion indented features are arranged in a periodic two-dimensional (2D) array.

6. The channel wall of claim 1, wherein said plurality of multi-portion indented features are arranged in a periodic two-dimensional (2D) array comprising a staggered row configuration.

7. The channel wall of claim 1, wherein said height of said ridge is from twenty to eighty percent of said maximum depth, and wherein said ridge extends across the full width of said multi-portion indented features.

8. A turbine engine, comprising:

a compressor for pressurizing air to generate compressed air;

a combustor for mixing said compressed air with fuel and combusting for generating a stream of hot combustion gases;

a turbine section for extracting energy from said stream of hot combustion gases;

a plurality of channel walls including a heat transfer augmented channel wall exposed to a flow path of said hot combustion gases in said combustor or said turbine section, said heat transfer augmented channel wall comprising;

a bulk portion;

an wall surface, and

a plurality of multi-portion indented features extending from said wall surface into said bulk portion,

wherein said multi-portion indented features each comprise;

a first indented portion, and

at least a second indented portion,

wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and

wherein said ridge has a height that is less than a depth of said multi-portion indented features.

9. The turbine of claim 8,

wherein said first indented portion comprises a first rim wherein said first rim comprises a first intersection of said first indented portion and said wall surface, said first rim having a first circular profile comprising a first radius and a first midpoint, and

wherein said second indented portion comprising a second rim wherein said rim comprises a second intersection of said second indented portion and said wall surface, said second rim has a second circular profile comprising a second radius and a second midpoint, said first midpoint and said second midpoint comprising a distance apart less than a sum of said first radius and said second radius, said distance apart being greater than zero.

10. The turbine of claim 8, wherein said plurality of multi-portion indented features are positioned after said combustion chamber in a flow direction of said hot combustion gases.

11. The turbine of claim 8, wherein said first and second indented portions both have a semispherical shape.

12. The turbine of claim 8, wherein said plurality of multi-portion indented features are arranged in a periodic two-dimensional (2D) array.

13. The turbine of claim 12, wherein said 2D array comprises a staggered row configuration.

14. The turbine of claim 8, wherein said height of said ridge is from twenty to eighty percent of said maximum depth, and wherein said ridge extends across the full width of said multi-portion indented features.

15. The turbine of claim 8, wherein a length dimension of said plurality of multi-portion indented features is aligned parallel to a flow direction of said stream of hot combustion gases.

16. A method of increasing heat transfer, comprising:

providing at least one heat transfer augmented channel wall within an apparatus that utilizes a hot fluid flow during operation, said channel wall comprising;

a bulk portion;

an wall surface, and

a plurality of multi-portion indented features extending from said wall surface into said bulk portion,

wherein said multi-portion indented features each comprise;

a first indented portion, and

at least a second indented portion,

wherein said first indented portion and said second indented portion are divided by a ridge which disrupts fluid flow between said first and second indented portions, and

wherein said ridge has a height that is less than a depth of said multi-portion indented features, and

flowing a hot gas over said channel wall during operation of said apparatus.

17. The method of claim 16, wherein said apparatus comprises a turbine engine and said channel wall is within a combustor or turbine section of said turbine engine.

18. The method of claim 16, wherein a length dimension of said plurality of multi-portion indented features is aligned parallel to a flow direction of said hot fluid flow.

19. The method of claim 16, wherein said first and second indented portions both have a semispherical shape, and said plurality of multi-portion indented features are arranged in a periodic two-dimensional (2D) array.

20. The method of claim 16, wherein said height of said ridge is from twenty to eighty percent of said maximum depth, and wherein said ridge extends across the full width of said multi-portion indented features.