sampling

spray research has developed and extensively validated a comprehensive set of SOP's governing spray sampling and experimental setup.

Our rigorous application of these SOP's assures highly repeatable test data and minimizes the introduction of undocumented experimental biases. Occasionally, severe experimental conditions may require deviations from the established protocols. At other times, the specific goals of a particular study may also require deviations or the development of custom protocols. All deviations from the SOP's are fully documented and assessed for their impact on the reported data.

There are, surprisingly, no accepted national or international standards governing the sampling protocols to be used in characterizing the sprays produced by the wide variety of spray atomizers currently available. 

The sprays produced by industrial-scale atomizers are far from homogeneous. Large variations in droplet diameter, velocity and flux density often occur within millimeters or centimeters across the spray envelope. These variations are partly dependent on the atomizer design and operating conditions. Additional variations are generated by geometrical asymmetries, eccentricities and material defects [burrs, porosity, scale, roughness, inclusions etc.] introduced into the subject atomizer by the manufacturing process. 

These characteristics of real-world sprays make the choice of sampling locations that are truly representative of the entire spray quite challenging. This is especially true when reasonable cost considerations dictate that the duration of the testing be kept as short as possible. 

The protocols governing data reporting, instrument validation and instrument setup are in accordance to the several relevant national and international standards that address the characterization of sprays:

 

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Last modified: September 12, 2013