Apparatus and method for creating pulsating fluid flow, and method of manufacture for the apparatus

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.