An innovative working model of a Moisture separator reheater (MSR) used in nuclear power plants was fabricated using transparent acrylic sheets. All the internal flow passages including drain water siphoning arrangement was modelled. The sinusoidal vanes (chevrons) of the MSR were made out of galvanised iron sheets. The model was tested in an air flow test rig fitted with water spray nozzles, mounted in counter flow direction. Effect of inlet flow velocity on the performance of the MSR was studid over range of air flow velocities between 4.50 to 6.75 m/s. The pressure drop occurring in the fine separator of MSR was determined from the probe traverse data at the fine separators. The critical velocity of the flow through the chevron packs was determined from the probe traverse data. Using the overall separation efficiency, the average droplet size used in the air-water droplets was calculated. The pressure drop data can be used to detect fouling of the chevrons. The operating flow velocities at inlet to chevrons are known for the present experimental results.

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