The vast unknown world of spray measurement
Written by: Joe Wolfgang
When Malvern sells a Mastersizer, the sample introduction is pretty much a known entity….a powder, or a suspension. There isn’t much mess created, much discomfort during the measurement, or surprises.
Measuring sprays is a different world, as we must adapt the laser instrument to the customer’s spray. I had a true “slap in the face” example of this on a recent Spraytec demo, consisting of:
Houston, Texas…outdoors…sunny, 95F (35°C), and 60% humidity
Gulf mosquitoes that were very hungry
Wearing a nomex 1 piece jumpsuit, with hardhat and goggles
In the shadow of a chemical reactor that gave off an occasional light scent of something that made my brain feel like it was swelling inside my skull
No chance to take a break for lunch
And the spray we were measuring, you ask?
1GPM (4 liters per minute) of water added to HP steam, with 6 orifices (a large spray). Imagine a steam locomotive that has burst a pipe.
Sufficiently loud volume to require ear protection, making conversation impossible
Believe it or not, all of that water added to the steam made a rather cool mist of liquid that occasionally drifted back onto us. The measurements were fairly successful, and additional testing was scheduled.