Velocity measurement - Import export

The measurement technique of LaserDopplerVelocimetry (LDV) is one of the most frequently applied modern measurement techniques in fluid mechanics to perform accurate local flow velocity measurements, which exhibits the advantage of a very high local and temporal resolution. Our technical department offers excellent conditions to perform such measurements (LDV).

For the generation and production of a spray the knowledge of information like the desired droplet size and its distribution is of fundamental importance. In order to characterise a spray correctly, one has to know the droplet size distribution of the droplets, which were generated out of a given liquid. In many applications it is desired to produce very small droplets. For the design and lay out of inhalers for example, it is necessary to achieve droplet sizes not larger than approximately 10 μm to be absorbed by the lungs. When one designs an atomisation nozzle in view of the desired droplet size distribution, one has to make sure via measurements, that the nozzle is really able the produce the expected droplet size distribution within an acceptable uncertainty range. Besides the droplet size distribution, the droplet velocity is an important parameter since it is a measure of the droplet momentum.

The particle image velocimetry (PIV) is an optical noninvasive working flow velocity measurement method. The flow field is made visible by introducing into the fluid small buoyancy neutral particles – the so called tracers. The particle flow then is illuminated with the aid of a light sheet and recorded at two defined different times within a small time interval with a digital camera. Because the particle move within this time interval with the flow, one can calculate the particles velocity by knowing its path between the two moments of illumination. The result is a velocity vector field of the flow. Here, we assume that the particles are small and follow the flow without any slip. Compared to local methods like LaserDopplerVelocimetry (LDV) with the ParticleImageVelocimetry one can reconstruct a whole flow region An extension of ParticleImageVelocimetry is the combination of PIV with thermometry (PIV/T).

The EMV-500 is a water/wastewater electromagnetic velocity open channel flowmeter sensor which is available in two sizes: SIZE A is suited for pipes or channels from 150 mm to 500 mm diameter SIZE B is suited for pipes or channels from 500 mm to 2.000 mm diameter. The sensor is encapsulated in an IP68 submersible ultra high molecular polyethylene body to be mounted with a special sensor mounting band in the pipe. When combined with the appropriate level sensor, the EMV-500 constitutes an efficient electromagnetic area/velocity flowmeter measuring both velocity and level in the same cross-section (or slice of pipe). This is a requirement necessary for accurate flow rate measurement using the continuity equation: Q = v x A In addition, electromagnetic sensors are totally unaffected by the concentration of debris or dilution of wastewater by rain. Key Features: Accurate flow measurements Grease tolerant: Grease shedding electrodes allow for reliable data collection

- Measuring average volumetric flow rate in flow directions - Totalizing volume of flows independently or calculating their algebraic sum with regard to flow direction - Determining the current value of flow velocity and flow direction - Outputting measurement results to the frequency/pulse or logical output - Logging of measurement data and configuration settings in the internal nonvolatile memory - Displaying measurement, configuration and history (logged) data on the built-in indicator (LCD) and outputting the data to the external devices via M-BUS interface or RS-485 interface - Configuring the flow meter according to on-site and process requirements - Monitoring and indicating alarm conditions (ER, error situations) and faults; recording error and fault types and intervals into the corresponding logs - Protecting logged data and configuration settings from unauthorized access, -R400 -MAP16 -EN ISO 4064, -OIML 49, -RO-2275-15356 (TYPE APPROVAL)