Mathematics for Industry Workshop

Venue and Travel Information


Final Program and Participants


Danfoss Industrial Controls:
Mathematical analysis of the dynamic flow characteristic in a damping nozzle for a pressure transmitter.

To set up
  1. an approximate but in practice usable method to calculate the bandwidth in stationary operation and
  2. a description of stages in possible start-up situations.

The "Puls-Snubber" (see figure 1) consists of a hole about ø0.3x0.5. At the input side is the media pressure and the output side looks into the "dead volume" about 1500 $mm^3$. The media can be gas or liquid, for instance air or hydraulic oil (32 cSt by 20C). The pressure in the dead volume is mea- sured by an incompressible pressure sensor with infinite band-width. The housing can be considered incompressible compared to the bulk-modulus of the media. The media in the dead volume can by start-up be anything between air, a mixture or liquid. The air in stationary operation will partly be dissolved in and partly removed by the initial liquid transport through the nozzle.

The function of the nozzle is to prevent cavitations in the dead volume which can damage the thin sealing diaphragm. The band-width by the pressure measurement should be reduced as little as possible.

Figure 1: MBS3250 with puls snubber

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Organisation of the ESGI-47