[AR] Re: Measuring Mass Flow Rate
- From: Henry Spencer <hspencer@xxxxxxxxxxxxx>
- To: Arocket List <arocket@xxxxxxxxxxxxx>
- Date: Sat, 30 Jan 2021 16:18:51 -0500 (EST)
On Sat, 30 Jan 2021, Brett Coles wrote:
... You mention cavitating venturis, but it seems like those
are more for flow restriction rather than actual measurement.
The point of a cavitating venturi would be to stabilize the flow rate, so
it's known to be constant (neglecting startup/shutdown transients). As
Bill noted, that makes it feasible to just measure liquid mass before and
after, rather than continuously. The price is some pressure drop.
Could we measure the pressure delta across the injector and use that to find
the mass flow rate? Or should we get an instrument that can measure the flow
rate directly?
Particularly for cryo fluids, where fluid density isn't a simple constant
but is a function of temperature (and, to some extent, pressure), direct
mass-flow measurement is definitely better.
In principle there are several ways of measuring mass flow directly, but
Coriolis flow meters are what everybody actually uses for this.
Henry
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