This question relates to liquids pumped through swirl type nozzles. Normally a slurry with a measured viscosity of around 0.2 Pa.s (200 cps)and density about 1.5 g/cm3 is pumped into the nozzle at 30 bar. Nozzle diameter is 1 mm. Flow rate is about 100 litres/hour. When the process is shut...