Determining the discharge coefficient of orifices is exactly my problem, but with small velocities (my problem is using orifices in hydraulic flocculators for potable water treatment). My students have developed a simple equipment to determine its value for different sizes ans Reynolds numbers. Infortunately, the results they have found so far were published in portuguese, but maybe you can have an idea readind their abstracts and seeing the figures. They are in my page in research gate. If you find them interesting for your work. I can put you in contact with my students for changing ideas (in english). I can assure you that they will love the idea.

Thanks Mr. Vianna, it would be grateful to be in touch with your students. You can please share their contact.

The contacs you asked for are:

1. Mr. Lucas Vassale: [email protected] 

2. Miss Camila Oliveira: [email protected] 

Thank you sir :)

A small part of the experimental studies concerning the determination of discharge coefficients of submerged orifices was recently published in the technical journal of our University. Unfortunately, it is in portuguese, but the link is:

http://www.fumec.br/revistas/construindo/about/submissions#authorGuidelines

Our University will be pleased if you wish to publish in this Journal. The article can be sent in english. So please feel free to submit your papers. If you have problems to read the orientations, I can find a way to translate the "author guidelines" to you.

k sir