Static fluid flow mixing method

• US 4,981,368 A
• Filed: 07/27/1988
• Issued: 01/01/1991
• Est. Priority Date: 07/27/1988
• Status: Expired due to Term

• Current Assignee: Vortab Corporation
• Original Assignee: Vortab Corporation
• Inventors: Smith, Charles R.
• Primary Examiner(s): Simone, Timothy F.
• Application Number:
  US07/224,690
• Time in Patent Office: 888 Days
• Field of Search: 366/336, 366/337, 366/338, 366/340, 366/341, 366/348, 138/40, 138/38, 138/42, 261/94, 261/DIG. 72, 428/34.1
• US Class Current: 366/337
• CPC Class Codes: B01F 25/3141 with additional mixing means other than injector mixers
• CPC Class Codes: B01F 25/43151 composed of consecutive sections of deformed flat pieces of material
• CPC Class Codes: B01F 25/4316 the baffles being flat pieces of material, e.g. intermeshing, fixed to the wall or fixed on a central rod
• CPC Class Codes: B01F 25/43161 composed of consecutive sections of flat pieces of material
• CPC Class Codes: B01F 25/43163 in the form of small flat plate-like elements
• CPC Class Codes: B01F 25/431974 Support members, e.g. tubular collars, with projecting baffles fitted inside the mixing tube or adjacent to the inner wall

Abstract

A method and apparatus for generating tip vortices comprising a series of ramped tabs projecting inward at an acute angle from a bounding surface of a fluid containment and transport vessel such that the tabs are sloped in the direction of the fluid flow and spaced about the internal circumference of the bounding surface transverse to the main flow direction for causing vigorous cross-stream mixing through the generation of paired alternating rotation tip vortices from oppposite sides of each tab with the vortices having their axes of rotation along the direction of the main flow. The vigorous cross-stream mixing will accomplish the equalization of various fluid properties such as velocity, thermal energy, kinetic energy and species concentration within the flow.

Claims

1. A method for producing cross-stream mixing in a fluid flow comprising the placing of one or more ramped tabs in the fluid flow, each said ramp extending from a bounding surface of a fluid containment and transport vessel and having a surface inclined inwardly at an acute angle from said bounding surface, and causing the fluid to flow over the edges of each said tab thereby deflecting the flowing fluid inward and up the inclined surface of each of said tabs to generate a pair of tip vortices in the fluid from each said tab, each said vortex having an opposite rotation to its paired vortex and an axis of rotation in the streamwise direction of the flow of fluid.

2. The method of claim 1 wherein the one or more ramped tabs are uniformly spaced about the internal circumference of the bounding surface along a line transverse to the direction of the streamwise flow.

3. The method of claim 1 wherein the one or more spaced apart tabs are uniformly spaced apart over only a segment of the bounding surface.

4. The method of claim 1 wherein the one or more ramped tabs may be configured in one of the shapes from the group of shapes including squares, rectangles, parallelograms and semi-ellipsoids.

5. The method of claim 1 wherein the acute angle is in the range between 20°

and 40°

from the bounding surface.

6. The method of claim 1 wherein the acute angle is in the range between 10°

and 60°

from the bounding surface.

7. A method for producing cross-stream mixing in a fluid flow comprising the placing of one or more tab arrays in the fluid flow, the individual tabs of said arrays extending from a bounding surface with each tab having a surface inclined inwardly at an acute angle from said bounding surface, and causing the fluid to flow over the edges of each tab in each of said arrays thereby deflecting the flowing fluid inward and up the inclined surface of each tab of each of said arrays to generate a pair of tip vortices in the fluid from each said tab, each said vortex having an opposite rotation to its paired vortex and an axis of rotation in the streamwise direction of the fluid flow.

8. The method of claim 7 wherein the tabs of the one or more tab arrays are uniformly spaced about the bounding surface along a line transverse to the direction of the streamwise flow.

9. The method of claim 7 wherein the tabs of the one or more tab arrays are uniformly spaced apart over only a segment of the bounding surface.

10. The method of claim 7 wherein the tabs of the one or more tab arrays may be configured in one of the shapes from the group of shapes including squares, rectangles, parallelograms and semi-ellipsoids.

11. The method of claim 7 wherein the acute angle is in the range between 20°

and 40°

from the bounding surface.

12. The method of claim 7 wherein the acute angle is in the range between 10°

and 60°

from the bounding surface.