Flow cell assembly including a fluid swirl chamber and ultrasonic agitation device

1. A flow cell for use with an analytical device having a measurement surface onto which a multiphase fluid to be measured can be received, the flow cell comprising:

a housing comprising an interface for connecting to an analytical device;

a fluid chamber provided in the housing, the fluid chamber comprising sidewalls at least partly defining an internal volume for receiving a multiphase fluid and an opening arranged so as to provide the multiphase fluid received in the internal volume to a measurement surface of the analytical device when the interface of the housing is connected to the analytical device; and

an agitation device comprising an ultrasonic sound-wave generator adapted to agitate the multiphase fluid within the internal volume of the fluid chamber and cause movement of the fluid through or within the opening thereby providing fluid to the measurement surface of the analytical device,

wherein the flow cell further comprises a barrier wall, and wherein the ultrasonic sound-wave generator is separated from the internal volume by the barrier wall; and

wherein the fluid chamber is a swirl chamber having a central axis, and wherein the agitation device is adapted to cause the multiphase fluid to flow around the central axis of the swirl chamber.

2. The flow cell of claim 1 , wherein the barrier wall is a sidewall of the fluid chamber.

3. The flow cell of claim 1 , wherein the agitation device comprises a cover and the barrier wall comprises the cover.

4. The flow cell of claim 1 , wherein a sidewall of the fluid chamber comprises an aperture and wherein the agitation device is positioned in or through the aperture.

5. The flow cell of claim 1 , wherein the flow cell further comprises a second agitation device comprising a second ultrasonic sound-wave generator and the ultrasonic sound-wave generators of the first and second agitation devices are arranged so as to cause the multiphase fluid to flow around the central axis of the swirl chamber,

wherein the ultrasonic sound-wave generators of the first and second agitation devices are each adapted to provide a directional force on the multiphase fluid so as to cause the multiphase fluid to flow around the central axis of swirl chamber, the directional force being in a direction that is tangential to the swirl chamber.

6. The flow cell of claim 1 , wherein the opening of the fluid chamber is located on the central axis of the swirl chamber.

7. The flow cell of claim 1 , wherein the fluid chamber has a substantially cylindrical, spherical, conical or vesica piscis prism shape.

8. The flow cell of claim 1 , further comprising:

a fluid inlet fluidly connected to the fluid chamber for providing a sample to the chamber.

9. The flow cell of claim 1 , wherein the agitation device is adapted to provide a directional force on the multiphase fluid so as to cause the multiphase fluid to flow around the swirl chamber, the directional force being in a direction that is tangential to the central axis of the swirl chamber.

10. The flow cell of claim 1 , further comprising:

a sealing surface located around the opening of the fluid chamber and adapted to seal the opening when the device is located against the measurement surface of the analytical device with the opening in fluid communication with the measurement surface.

11. An assembly for measuring a property of a multiphase fluid sample, the assembly comprising:

an analytical device comprising a measurement surface for receiving a fluid to be measured; and

a flow cell connected to the analytical device, the flow cell comprising:

a housing;

a fluid chamber provided in the housing, the fluid chamber comprising sidewalls defining an internal volume for receiving a multiphase fluid and an opening, wherein the fluid chamber is a swirl chamber having a central axis; and

an agitation device comprising an ultrasonic sound-wave generator adapted to agitate the multiphase fluid within the internal volume of the fluid chamber, wherein the flow cell further comprises a barrier wall, and wherein the ultrasonic sound-wave generator is separated from the internal volume by the barrier wall and is adapted to cause the multiphase fluid to flow around the central axis of the swirl chamber,

wherein the opening is located so as to fluidly connect the fluid chamber and the measurement surface and wherein the flow cell is adapted such that the agitation device causes movement of the fluid through or within the opening.

12. The assembly of claim 11 , wherein the analytical device is an optical property measurement device, or wherein the analytical device is a refractometer.

13. A method for measuring a property of a multiphase fluid, the method comprising:

providing an assembly that comprises an analytical device comprising a measurement surface for receiving a fluid to be measured, and a flow cell connected to the analytical device, wherein the flow cell comprises a housing, a fluid chamber provided in the housing, the fluid chamber comprising sidewalls defining an internal volume for receiving a multiphase fluid and an opening, wherein the fluid chamber is a swirl chamber having a central axis, and an agitation device comprising an ultrasonic sound-wave generator adapted to agitate the multiphase fluid within the internal volume of the fluid chamber, wherein the flow cell further comprises a barrier wall, and wherein the ultrasonic sound-wave generator is separated from the internal volume by the barrier wall and is adapted to cause the multiphase fluid to flow around the central axis of the swirl chamber, wherein the opening is located so as to fluidly connect the fluid chamber and the measurement surface and wherein the flow cell is adapted such that the agitation device causes movement of the fluid through or within the opening;

providing the multiphase fluid to the fluid chamber of the flow cell;

agitating the multiphase fluid within the fluid chamber to flow the multiphase fluid sample across the measurement surface; and

measuring a property of the multiphase fluid on the measurement surface.

14. The method of claim 13 , wherein the measurement surface is a prism surface of a refractometer and wherein measuring the property of the multiphase fluid on the measurement surface comprises measuring the refractive index of the multiphase fluid.

15. The method of claim 14 , wherein the multiphase fluid is a solid-containing liquid, a mixture of at least two immiscible liquids, or a gas-containing liquid.

16. The assembly of claim 11 , wherein the housing of the flow cell comprises an interface for connecting to the analytical device; and

wherein the opening of the fluid chamber is arranged so as to provide the multiphase fluid received in the internal volume to the measurement surface of the analytical device when the interface of the housing is connected to the analytical device; and

wherein the agitation mechanism is adapted to cause movement of the fluid through or within the opening thereby providing the multiphase fluid to the measurement surface of the analytical device.