flow
flow
(OP)
please explain difference between mass flow and volume flow?
INTELLIGENT WORK FORUMS
FOR ENGINEERING PROFESSIONALS Come Join Us!Are you an
Engineering professional? Join Eng-Tips Forums!
*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail. Posting GuidelinesJobs |
|
RE: flow
Mass flow rate: the mass of fluid in motion which crosses a given area in a unit time.
Volume flow rate: ditto about the volume of fluid.
RE: flow
con you explain where we can measure the MASS flow & where we can measure VOLUME flow?
RE: flow
With other flow meters you are determining a volume flow rate at standard conditions and using the STP conditions you can convert the indicated pressure, and temperature to a volume flow rate.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: flow
RE: flow
RE: flow
Those meters measure vibration and displacement and infer a density and momentum. They in no way "measure density and mass flow directly". Not even close. Just like a turbine meter infers a flow from a rotational velocity or a dP meter infers a volume flow from a pressure, temperature, and a differential pressure, Coriolis meter infer a flow from parameters that can be influenced by things other than the fluid flow in a pipe. They often do an OK job of giving you numbers that are related to the flow, sometimes they do a very good job, other times they are really expensive random number generators. Regardless of the marketing literature, they are not magical.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: flow
Good luck,
Latexman
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: flow
In other words the meter only gave him meaningful numbers for those few nano seconds per month when the flow matched the averages. In a plant, you can put them on single-phase flow streams that only change density with pressure and temperature and get decent, repeatable results. But there are 50 other technologies that will do as well in that service.
Nothing does a good job with unknown and varying mixtures of fluids, but Emerson has been touting the Coriolis as just such a meter ever since they bought MicroMotion by claiming that the "measure density directly". Saying it a million times does not make it true.
David Simpson, PE
MuleShoe Engineering
"Belief" is the acceptance of an hypotheses in the absence of data.
"Prejudice" is having an opinion not supported by the preponderance of the data.
"Knowledge" is only found through the accumulation and analysis of data.
The plural of anecdote is not "data"
RE: flow
Good luck,
Latexman
Need help writing a question or understanding a reply? forum1529: Translation Assistance for Engineers
RE: flow
Above postings plus the followng link explain uses and limitations of mass flow meters:
http://www.omega.com/literature/transactions/volum...