I'm a designer and I have no background in physics and have almost no understanding of fluid behavior.
I've been asked to change the dimensions of a reflection chamber on a lab spectrometer.
A tube with about 29mmˆ2 section comes into the chamber, the chamber then changes shape to a rectangular section, 2mm by 14.5mm. So far so good.
I've been asked to change the dimensions of the chamber so that it now has 0.5mm thickness (by 4*14.5mm, so that total section areal is still the same). I replied by asking if the restriction of this new shape would be the same, even if the section area is still the same. The person who asked for me to change the shape couldn't provide an assertive answer.
I mean, you can't infinitely vary the thickness of a shape and make it wider and expect it to behave in the same way, right? At some point too thin of a section will be too restrictive irregardless of total section area, right?
If so, is there a way we can calculate, simulate or test this?
The liquids to be analysed are mainly water solutions at ~30degreeC. I don't have exact figures on fluid speed but the chamber is gravity fed through a funnel and a "cup".