Nederlandse Organisatie Voor Toegepast-natuurwetenschappelijk Onderzoek Tno

Rik Jansen

Arno Willem Frederik Volker

Lun Kai Cheng

Peter Martijn Toet

Peter Van Capel

A pressure sensing assembly (), comprising: an elongate, axially extending tube (), having a flexible tube wall () that encloses an inner pressure chamber (); and at least one sensor unit (), including: two tube wall fixation devices (), connected to the tube wall () at respective axially spaced apart positions, and configured to fix respective diameters (D, d) of the tube wall at said positions; and a first strain sensing element (), connected to the tube wall () at a first position axially in between said two tube wall devices (), and configured to provide a first signal indicative of an axial elongation of the tube wall resulting from a change in axial curvature of the tube wall when a pressure differential between the inner pressure chamber () and an outside environment () of the tube is applied across the tube wall at said first position.

Pressure sensing assembly

Operation of an oil-water separator or other liquid mixture separator is monitored. The separator uses a vessel through which a mixture of different liquid components flows horizontally. A plurality of ultrasound transducers is provided on a wall of the vessel at different heights at a common stage along the direction of the horizontal flow. Ultrasound at a plurality of different ultrasound wavelengths is transmitted through the vessel between transducers and ultrasound arriving transducers is detected. Parameter values of a model are fitted to the detection. A model is used that relates height dependent properties of liquid in the vessel to properties of the detected ultrasound transmission between transceivers, the model comprising at least a fittable parameter of a height dependent droplet size distribution in a least a sub-range of a height of liquid in the vessel. The model relating the droplet size distribution to ultrasound wavelength dependence of the properties of ultrasound transmission. The measured droplet size distribution may be used to determine the route of ultrasound paths and to control demulsification measures.

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Delft, Netherlands

Rik Jansen