CONTINUOUS FLOW, ELECTROHYDRODYNAMIC MICROMIXING APPARATUS AND METHODS

• US 20010050881A1
• Filed: 09/20/1999
• Published: 12/13/2001
• Est. Priority Date: 09/20/1999
• Status: Abandoned Application

• Current Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Original Assignee: Lockheed Martin Energy Research Corporation (Martin Marietta Corporation)
• Inventors: DEPAOLI, DAVID W., TSOURIS, CONSTANTINOS
• Application Number:
  US09/398,675
• Publication Number:
  US 20010050881A1
• Time in Patent Office: Days
• US Class Current: 366/167.1
• CPC Class Codes: B01F 25/3131 with additional mixing means other than injector mixers, e.g. screens, baffles or rotating elements
• CPC Class Codes: B01F 33/05 Mixers using radiation, e.g. magnetic fields or microwaves to mix the material B01F23/2133, B01F23/238, B01F23/55, B01F33/3031, B01F33/3032 take precedence
• CPC Class Codes: B01F 33/3031 using electro-hydrodynamic [EHD] or electro-kinetic [EKI] phenomena to mix or move the fluids
• CPC Class Codes: B01F 33/3032 using magneto-hydrodynamic [MHD] phenomena to mix or move the fluids
• CPC Class Codes: B01F 35/712 for feeding fluids
• CPC Class Codes: B01F 35/71805 using valves, gates, orifices or openings
• CPC Class Codes: B01J 19/0093 Microreactors, e.g. miniaturised or microfabricated reactors laboratory containers with capillary fluid transport in microfabricated channels or chambers B01L3/5027
• CPC Class Codes: B01J 2219/00889 Mixing
• CPC Class Codes: B01J 2219/00891 Feeding or evacuation

Abstract

The present invention relates to methods and apparatus that employ electrohydrodynamic flows in miscible, partially miscible and immiscible multiphase systems to induce mixing for dissolution and/or reaction processes. The apparatus and methods of the present invention allow micromixing of two or more components and can advantageously be used to conduct liquid-phase reactions uniformly and at high rates

Claims

1. An apparatus for mixing fluids comprising:

a first conduit having an interior space for conveying at least one first liquid;

a second conduit having an interior space for conveying at least one second liquid, the second conduit comprising at least two ends and penetrating the first conduit at an opening in the first conduit, the first end of said second conduit for receiving the at least one second fluid is located exterior the interior space of the first conduit and the second end of said second conduit terminates in an outlet that is located within the interior space of the first conduit so that said at least one second fluid can be injected into the interior space of the first conduit and the second conduit electrically insulated from the first conduit at the opening in the first conduit through which the second conduit penetrates the first conduit;

at least one electrode located exterior the interior space of said first conduit and proximate the outlet of said second conduit so that an electric potential difference applied between the outlet of said second conduit and the at least one electrode has an influence on the at least one second fluid exiting the outlet of said second conduit; and

a means for applying an electric potential difference between the outlet of the said second conduit and the electrode.

2. The apparatus of

claim 1

, wherein said at least one first liquid flows in said first conduit in a direction different from the direction of the flow of said at least one second fluid that is conveyed in and flows through said second conduit.

3. The apparatus of

claim 1

, wherein the at least one electrode is integral with or forms a portion of said first conduit.

4. The apparatus of

claim 1

, wherein the at least one electrode is exterior said first conduit.

5. The apparatus of

claim 1

, wherein the diameter of the outlet of the second conduit ranges from about 100 microns to about 2 millimeters.

6. The apparatus of

claim 1

, wherein the inner diameter of the first conduit ranges from about 0.1 centimeters to about 10 centimeters.

7. The apparatus of

claim 1

, wherein said second conduit is electrically insulated from the first conduit by a coating of a nonconductive material on the exterior surface of said second conduit

8. The apparatus of

claim 1

, wherein said second end of said second conduit terminates in a conical tip.

9. The apparatus of

claim 1

, wherein the apparatus further comprises a third conduit having an interior space for conveying at least one liquid, the third conduit comprising at least two ends and penetrating the first conduit at an opening in the first conduit, the first end of said third conduit for receiving the at least one fluid is located exterior the interior space of the first conduit and the second end of said third conduit terminates in an outlet that is located within the interior space of the first conduit so that said at least one fluid can be injected into the interior space of the first conduit and the third conduit electrically insulated from the first conduit at the opening in the first conduit through which the third conduit penetrates the first conduit

10. An apparatus for mixing fluids comprising:

a conduit having an interior space for conveying at least one first liquid;

a metal capillary having an interior space for conveying at least one second liquid, the metal capillary comprising at least two ends and penetrating the conduit at an opening in the conduit, the first end of said metal capillary for receiving the at least one second fluid is located exterior the interior space of the conduit and the second end of said metal capillary terminates in an outlet that is located within the interior space of the conduit so that said at least one second fluid can be injected into the interior space of the conduit;

an insulating means disposed around the metal capillary from a portion of the metal capillary exterior the conduit and the opening in the conduit through which the metal capillary penetrates the conduit to an area proximate the outlet of the metal capillary;

at least one electrode located exterior the interior space of said conduit and proximate the outlet of said metal capillary so that an electric potential difference applied between the outlet of said metal capillary and the at least one electrode has an influence on the at least one second fluid exiting the outlet of said metal capillary; and

a means for applying an electric potential difference between the outlet of the said metal capillary and the electrode.

11. The apparatus of

claim 10

, wherein said at least one first liquid flows in said conduit different from the direction of the flow of said at least one second fluid that is conveyed in and flows through said metal capillary.

13. The apparatus of

claim 10

, wherein the at least one electrode is exterior said conduit.

14. The apparatus of

claim 10

, wherein the diameter of the outlet of the metal capillary ranges from about 100 microns to about 2 millimeters.

15. The apparatus of

claim 10

, wherein the inner diameter of the conduit ranges from about 0.1 centimeters to about 10 centimeters.

16. The apparatus of

claim 10

, wherein the insulating means comprises a coating of a nonconductive material on the exterior surface of said metal capillary.

17. The apparatus of

claim 10

, wherein the insulating means comprises a tube of an insulating material disposed around the metal capillary.

18. The apparatus of

claim 10

, wherein said metal capillary comprises a conical tip.

19. The apparatus of

claim 10

, further comprising

a second metal capillary having an interior space for conveying at least one liquid, the metal capillary comprising at least two ends and penetrating the conduit at an opening in the conduit, the first end of said metal capillary for receiving the at least one second fluid is located exterior the interior space of the conduit and the second end of said metal capillary terminates in an outlet that is located within the interior space of the conduit so that said at least one second fluid can be injected into the interior space of the conduit;

and

an insulating means disposed around the metal capillary from a portion of the metal capillary exterior the conduit and the opening in the conduit through which the metal capillary penetrates the conduit to an area proximate the outlet of the metal capillary.

12. The apparatus of 10, wherein the at least one electrode is integral with or forms a portion of said conduit.

20. An apparatus for mixing fluids comprising:

a conduit having an interior space for conveying at least one first liquid and comprising a metal conductive portion;

a metal capillary having an interior space for conveying at least one second liquid, the metal capillary comprising at least two ends and penetrating the conduit at an opening in the conduit, the first end of said metal capillary for receiving the at least one second fluid is located exterior the interior space of the conduit and the second end of said metal capillary terminates in an outlet that is located within the interior space of the conduit and proximate the metal conductive portion of the conduit so that said at least one second fluid can be injected into the interior space of the conduit and is influenced by an electrical potential difference between the metal capillary and the metal portion of the conduit;

an insulating means disposed around the metal capillary from a portion of the metal capillary exterior the conduit and the opening in the conduit through which the metal capillary penetrates the conduit to an area proximate the outlet of the metal capillary; and

a means for applying an electric potential difference between the outlet of the said metal capillary and the metal conductive portion of the conduit.

21. The apparatus of

claim 20

, wherein said at least one first liquid flows in said conduit in a direction that is different from the direction of the flow of said at least one second fluid that is conveyed in and flows through said metal capillary.

22. The apparatus of

claim 20

, wherein the diameter of the capillary tube outlet ranges from about 100 microns to about 2 millimeters.

23. The apparatus of

claim 20

, wherein the inner diameter of the conduit ranges from about 0.1 centimeters to about 10 centimeters.

24. The apparatus of

claim 20

, wherein the insulating means comprises a coating of a nonconductive material on the exterior surface of said metal capillary.

25. The apparatus of

claim 20

, wherein the insulating means comprises a tube of a substantially nonconductive material disposed around the metal capillary.

26. A method of mixing fluids comprising:

conveying at least one first fluid through a first conduit having an interior space;

conveying at least one second fluid through a second conduit having an interior space, the second conduit comprising at least two ends and penetrating the first conduit at an opening in the first conduit, the first end of said second conduit for receiving the at least one second fluid is located exterior the interior space of the first conduit and the second end of said second conduit terminates in an outlet that is located within the interior space of the first conduit so that said at least one second fluid is injected into the interior space of the first conduit and the second conduit electrically insulated from the first conduit at the opening in the first conduit through which the second conduit penetrates the first conduit;

applying an electric potential difference between the outlet of said second conduit and at least one electrode located exterior the interior space of said first conduit and proximate the outlet of said second conduit so that an electric potential difference applied between the outlet of said second conduit and the at least one electrode has an influence on the at least one second fluid exiting the outlet of said second conduit and induces micromixing of said at least one first fluid and said at least one second fluid.

27. The method of

claim 26

, wherein said at least one first fluid is conveyed in and flows in said first conduit in a direction different from the direction of the flow of said at least one second fluid that is conveyed in and flows through said second conduit.

28. The method of

claim 26

, wherein said at least one first fluid is conveyed in and flows in said first conduit in a direction that is substantially the same as the direction of the flow of said at least one second fluid that is conveyed in and flows through said second conduit.

29. The method of

claim 26

, wherein said at least one first fluid is miscible with said at least one second fluid.

30. The method of

claim 26

, wherein said at least one first fluid is at least partially miscible with said at least one second fluid.

31. The method of

claim 26

, wherein said at least one first fluid comprises at least one reactive species that is reactive with at least one species that is contained in said at least one second fluid.

32. The method of

claim 26

, wherein said at least one first fluid is at least partially miscible with said at least one second fluid.

33. The method of

claim 26

, wherein the electric potential difference is applied between the outlet of said second conduit and at least one electrode is a high voltage direct current, a pulsed direct current or an alternating current.

34. The method of

claim 26

, wherein the first fluid has a high dielectric constant and low conductivity.

35. The method of

claim 26

, wherein electrodynamic flows of said at least one first fluid and said at least one second fluid are caused by charge injection at the tip of the second conduit.

36. The method of

claim 35

, wherein the electrodynamic flows induce turbulent mixing of said at least one first fluid and said at least one second fluid.