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In one embodiment, the present invention provides an apparatus for creating pulsating fluid flow, including an inlet into which fluid flows and a chamber having an upstream end and a downstream end. The chamber is defined by a pair of outwardly-projecting sidewalls, and the inlet is disposed at the

In one embodiment, the present invention provides an apparatus for creating pulsating fluid flow, including an inlet into which fluid flows and a chamber having an upstream end and a downstream end. The chamber is defined by a pair of outwardly-projecting sidewalls, and the inlet is disposed at the upstream end of the chamber. This particular embodiment further includes at least two feedback passages with opposed entrances at the downstream end of the chamber and opposed exits at the upstream end of the chamber, near where the chamber joins the inlet. At least one feedback outlet leaves each of the feedback passages. A feedback cavity is disposed at the downstream end of the chamber. At least one exit flowline having an exit port leaves the at least one feedback outlet.

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What is claimed is: 1. An apparatus for creating a pulsating fluid flow, comprising: an inlet into which fluid flows, a chamber having an upstream end and a downstream end, wherein the chamber is defined by a pair of outwardly-projecting sidewalls and wherein the inlet is disposed at the upstream e

What is claimed is: 1. An apparatus for creating a pulsating fluid flow, comprising: an inlet into which fluid flows, a chamber having an upstream end and a downstream end, wherein the chamber is defined by a pair of outwardly-projecting sidewalls and wherein the inlet is disposed at the upstream end of the chamber, at least two feedback passages having opposed entrances at the downstream end of the chamber and opposed exits at the upstream end of the chamber near where the chamber joins the inlet, a feedback cavity disposed at the downstream end of the chamber, and at least one exit flowline leaving each of the feedback passages, wherein the at least one exit flowline has an exit port; wherein a pulsating fluid flow is generated through the exit port; and wherein the inlet, the chamber, the at least two feedback passages, the feedback cavity and the at least one exit flowline leaving each of the two feedback passages are disposed on a half mandrel. 2. The apparatus of claim 1, wherein the entirety of the at least one exit flowline is substantially perpendicular to the flow of fluid into the inlet. 3. The apparatus of claim 1, wherein a portion of the at least one exit flowline is parallel to the flow of fluid into the inlet. 4. The apparatus of claim 1, wherein the exit port of the at least one exit flowline is disposed near the upstream end of the chamber. 5. The apparatus of claim 1, wherein the exit port of the at least one exit flowline is disposed near the downstream end of the chamber. 6. The apparatus of claim 1, wherein the exit ports of the at least one exit flowlines are disposed near the upstream end of the chamber at an angle to a plane containing the chamber. 7. The apparatus of claim 1, wherein the exit ports of the at least one exit flowlines are disposed near the downstream end of the chamber at an angle to a plane containing the chamber. 8. The apparatus of claim 1, wherein the exit port of one at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle behind the plane containing the chamber. 9. The apparatus of claim 1, wherein the exit port of one at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle in front of the plane containing the chamber. 10. The apparatus of claim 9 wherein the exit port of another at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle behind the plane containing the chamber. 11. The apparatus of claim 1, further comprising at least one fluid outlet leaving the feedback cavity. 12. The apparatus of claim 11, wherein the at least one fluid outlet is parallel to the flow of fluid into the inlet. 13. The apparatus of claim 1, further comprising: a second inlet from the fluid flowline, a second chamber having an upstream end and a downstream end, wherein the second chamber is defined by a second pair of outwardly-projecting sidewalls and wherein the second inlet is disposed at the upstream end of the second chamber, at least two second feedback passages having opposed entrances at the downstream end of the second chamber and opposed exits at the upstream end of the second chamber near where the second chamber joins the second inlet, a second feedback cavity disposed at the downstream end of the second chamber, and at least one second exit flowline leaving each of the second feedback passages, wherein the at least one second exit flowline has an exit port. 14. The apparatus of claim 13, wherein the second inlet, the second chamber, the at least two second feedback passages, the second feedback cavity, and the at least one second exit flowline are disposed beneath the chamber. 15. The apparatus of claim 1, further comprising: a second inlet into which fluid flows, a second chamber having an upstream end and a downstream end, wherein the second chamber is defined by a second pair of outwardly-projecting sidewalls and wherein the second inlet is disposed at the upstream end of the second chamber, at least two second feedback passages having opposed entrances at the downstream end of the second chamber and opposed exits at the upstream end of the second chamber near where the second chamber joins the second inlet, a second feedback cavity disposed at the downstream end of the second chamber, and at least one second exit flowline leaving each of the second feedback passages, wherein the at least one second exit flowline has an exit port. 16. The apparatus of claim 15, wherein the second inlet, second chamber, the at least two second feedback passages, the second feedback cavity, and the at least one second exit flowline are disposed beneath the chamber on the half mandrel. 17. The apparatus of claim 1, wherein a portion of the at least one exit flowline is substantially perpendicular to the flow of fluid into the inlet. 18. The apparatus of claim 17, wherein another portion of the at least one exit flowline is parallel to the flow of fluid into the inlet. 19. The apparatus of claim 18, wherein the exit port of the at least one exit flowline is disposed near the upstream end of the chamber. 20. The apparatus of claim 18, wherein the exit port of the at least one exit flowline is disposed near the downstream end of the chamber. 21. The apparatus of claim 1, wherein the at least one exit flowline is disposed at an angle to the flow of fluid into the inlet. 22. The apparatus of claim 21, wherein the angle at which the at least one exit flowline is disposed is determined by the application for which the apparatus for creating pulsating fluid flow will be used. 23. The apparatus of claim 21, wherein the angle at which the at least one exit flowline is disposed is between 10 degrees and 60 degrees. 24. The apparatus of claim 21, wherein the angle at which the at least one exit flowline is disposed is between 20 degrees and 45 degrees. 25. An apparatus for creating a pulsating fluid flow, comprising: an inlet into which fluid flows, a chamber having an upstream end and a downstream end, wherein the chamber is defined by a pair of outwardly-projecting sidewalls and wherein the inlet is disposed at the upstream end of the chamber, at least two feedback passages having opposed entrances at the downstream end of the chamber and opposed exits at the upstream end of the chamber near where the chamber joins the inlet, at least one feedback outlet leaving each of the feedback passages, a feedback cavity disposed at the downstream end of the chamber, and at least one exit flowline leaving the at least one feedback outlet, wherein the at least one exit flowline has an exit port; wherein a pulsating fluid flow is generated through the exit port; and wherein the inlet, the chamber, the at least two feedback passages, the at least one feedback outlet, and the feedback cavity are disposed on a mandrel to form a first fluidic oscillator insert. 26. The apparatus of claim 25, wherein the at least one feedback outlet is substantially perpendicular to a tangent to the feedback passage on which it is disposed, wherein the tangent is taken at the point where the at least one feedback outlet is located. 27. The apparatus of claim 25 wherein the entirety of the at least one exit flowline is substantially perpendicular to the flow of fluid into the inlet. 28. The apparatus of claim 25 wherein a portion of the at least one exit flowline is parallel to the flow of fluid into the inlet. 29. The apparatus of claim 25 wherein the exit port of the at least one exit flowline is disposed near the upstream end of the chamber. 30. The apparatus of claim 25 wherein the exit port of the at least one exit flowline is disposed near the downstream end of the chamber. 31. The apparatus of claim 25 wherein the exit port of the at least one exit flowline is disposed near the upstream end of the chamber at an angle to a plane containing the chamber. 32. The apparatus of claim 25 wherein the exit port of the at least one exit flowline is disposed near the downstream end of the chamber at an angle to a plane containing the chamber. 33. The apparatus of claim 25 wherein the exit port of one at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle behind the plane containing the chamber. 34. The apparatus of claim 25 further comprising a housing that accommodates the fluidic oscillator insert. 35. The apparatus of claim 25, wherein the at least one exit flowline is formed in the housing. 36. The apparatus of claim 25, wherein the housing comprises an opening over the chamber. 37. The apparatus of claim 25, wherein the at least one exit flowline is disposed at an angle to the flow of fluid into the inlet. 38. The apparatus of claim 37 wherein the angle at which the at least one exit flowline is disposed is determined by the application for which the apparatus for creating pulsating fluid flow will be used. 39. The apparatus of claim 25 wherein the exit port of one at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle in front of the plane containing the chamber. 40. The apparatus of claim 39 wherein the exit port of another at least one exit flowline leaving one of the at least two feedback passages is disposed at an angle behind the plane containing the chamber. 41. The apparatus of claim 25, further comprising at least one fluid outlet leaving the feedback cavity. 42. The apparatus of claim 41, wherein the at least one fluid outlet is parallel to the flow of fluid into the inlet. 43. The apparatus of claim 25 wherein a portion of the at least one exit flowline is substantially perpendicular to the flow of fluid into the inlet. 44. The apparatus of claim 43 wherein another portion of the at least one exit flowline is parallel to the flow of fluid into the inlet. 45. The apparatus of claim 44, wherein the exit port of the at least one exit flowline is disposed near the upstream end of the chamber. 46. The apparatus of claim 44, wherein the exit port of the at least one exit flowline is disposed near the downstream end of the chamber. 47. The apparatus of claim 25, further comprising: a second inlet into which fluid flows, a second chamber having an upstream end and a downstream end, wherein the second chamber is defined by a second pair of outwardly-projecting sidewalls and wherein the second inlet is disposed at the upstream end of the second chamber, at least two second feedback passages having opposed entrances at the downstream end of the second chamber and opposed exits at the upstream end of the second chamber near where the second chamber joins the second inlet, at least one second feedback outlet leaving each of the second feedback passages, a second feedback cavity disposed at the downstream end of the second chamber, and at least one second exit flowline leaving the at least one second feedback outlet, wherein the at least one exit flowline has an exit port. 48. The apparatus of claim 47, further comprising a housing that accommodates the fluidic oscillator insert. 49. The apparatus of claim 48, wherein the at least one exit flowline and at least one second exit flowline are formed in the housing. 50. The apparatus of claim 48, wherein the second inlet, the second chamber, the at least two second feedback passages, the at least one second feedback outlet, and the second feedback cavity are disposed beneath the chamber on the fluidic oscillator insert. 51. The apparatus of claim 48, wherein the second inlet, the second chamber, the at least two second feedback passages, the at least one second feedback outlet, and the second feedback cavity are disposed on a second mandrel to create a second fluidic oscillator insert. 52. The apparatus of claim 30, wherein the second fluidic oscillator insert is disposed downstream from the fluidic oscillator insert. 53. The apparatus of claim 51, wherein the housing accommodates the fluidic oscillator insert and the second fluidic oscillator insert. 54. The apparatus of claim 53, further comprising a passageway through which fluid may flow through the fluidic oscillator insert into the second fluidic oscillator insert.