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An oscillating-wave engine or refrigerator having a regenerator or a stack in which oscillating flow of a working gas occurs in a direction defined by an axis of a trunk of the engine or refrigerator, incorporates an improved heat exchanger. First and second connections branch from the trunk at loca

An oscillating-wave engine or refrigerator having a regenerator or a stack in which oscillating flow of a working gas occurs in a direction defined by an axis of a trunk of the engine or refrigerator, incorporates an improved heat exchanger. First and second connections branch from the trunk at locations along the axis in selected proximity to one end of the regenerator or stack, where the trunk extends in two directions from the locations of the connections. A circulating heat exchanger loop is connected to the first and second connections. At least one fluidic diode within the circulating heat exchanger loop produces a superimposed steady flow component and oscillating flow component of the working gas within the circulating heat exchanger loop. A local process fluid is in thermal contact with an outside portion of the circulating heat exchanger loop.

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1. In an oscillating-wave engine or refrigerator having a regenerator or a stack in which oscillating flow of a working gas occurs in a direction defined by an axis of a trunk of the engine or refrigerator, a heat exchanger comprising: first and second connections branching from the trunk at loca

1. In an oscillating-wave engine or refrigerator having a regenerator or a stack in which oscillating flow of a working gas occurs in a direction defined by an axis of a trunk of the engine or refrigerator, a heat exchanger comprising: first and second connections branching from the trunk at locations along the axis in selected proximity to one end of the regenerator or stack, where the trunk extends in two directions from the locations of the connections; a circulating heat exchanger loop connected to the first and second connections; and at least one fluidic diode within the circulating heat exchanger loop to produce a superimposed steady flow component and oscillating flow component of the working gas within the circulating heat exchanger loop; wherein a local process fluid is in thermal contact with an outside portion of the circulating heat exchanger loop. 2. The heat exchanger of claim 1, wherein the circulating heat exchanger is sized so that the oscillating flow component has no local volume flow rate amplitude maxima in the circulating heat exchanger located at the first and second connections. 3. The heat exchanger of claim 2, wherein the at least one fluidic diode is located at a local volume flow rate amplitude maximum location. 4. The heat exchanger of claim 1, wherein the first and second connections are located at locations of minimal oscillating volume flow rate of the working gas in the circulating heat exchanger. 5. The heat exchanger of claim 4, wherein the at least one fluidic diode is located at a location of a local volume flow rate amplitude maximum. 6. In an oscillating-wave engine or refrigerator having a regenerator or a stack in which oscillating flow of a working gas occurs in a direction defined by an axis of a trunk of the engine or refrigerator, an improved heat exchanger comprising: first and second connections branching from the trunk at locations along the axis in selected proximity to one end of the regenerator or stack, where the trunk extends in two directions from the locations of the connections; a circulating heat exchanger loop connected to the first and second connections, wherein the length of the circulating heat exchanger loop is an integral number of wavelengths of the working gas at a temperature of the circulating heat exchanger loop; and at least one fluidic diode within the circulating heat exchanger loop to produce a superimposed steady flow component and oscillating flow component of the working gas in the circulating heat exchanger loop; wherein a local process fluid is in thermal contact with an outside portion of the circulating heat exchanger loop. 7. The heat exchanger of claim 6, wherein the circulating heat exchanger is sized so that the oscillating flow component has no local volume flow rate amplitude maxima in the circulating heat exchanger located at the first and second connections. 8. The heat exchanger of claim 7, wherein the at least one fluidic diode is located at a local volume flow rate amplitude maximum location. 9. The heat exchanger of claim 6, wherein the first and second connections are located at location of minimal oscillating volume flow rate of the working gas in the circulating heat exchanger. 10. The heat exchanger of claim 9, wherein the at least one fluidic diode is located at a location of a local volume flow rate amplitude maximum.