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Thread: m=V/v
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14-08-2016, 09:31 PM #1
m=V/v
Anyone familiar with the relationship between mass flow rate and volume flow rate divided by velocity? m = V/v. Im probably mistaking something though. Thanks.
The word "gasoline" is a mistake in the image, should be "air".
mvv.pngLast edited by seanf; 15-08-2016 at 08:36 AM.
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14-08-2016, 11:01 PM #2
Re: m=V/v
What has the potental energy of gasoline got to do with the airflow in a duct?
Brian - Newton Abbot, Devon, UK
Retired March 2015
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15-08-2016, 08:33 AM #3
Re: m=V/v
Hi Brian_UK,
Sorry should have said the word gasoline is a mistake in the question, it should be air
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15-08-2016, 11:39 AM #4
Re: m=V/v
Okay, panic over,
Brian - Newton Abbot, Devon, UK
Retired March 2015
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15-08-2016, 12:01 PM #5
Re: m=V/v
Any knowledge of it Brian_UK?
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15-08-2016, 02:22 PM #6
Re: m=V/v
To be honest, no.
All that says to me is that it depends on the air density to calculate mass, which we knew anyway.
Volume flow rate divided by velocity gives the duct/pipe area.
Sorry I can't be of more help.Brian - Newton Abbot, Devon, UK
Retired March 2015
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15-08-2016, 04:53 PM #7
Re: m=V/v
no problem Brian_UK. I will share what else I know in case anyone has a thought.
The only other info that may be relevant that I have is,
P pressure is energy per unit volume in J/m^3
Pv pressure*velocity is energy per unit mass in J/kg
So then the thought is energy per unit mass E/m = Pv
E/m = (E/V) * v
Take reciprocal of both sides
m/E = V * 1/E * 1/v
Multiply both sides by E
m = V/v
But Im not sure thats correct.
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15-08-2016, 08:32 PM #8
Re: m=V/v
Does this throw any light on it ?
https://www.google.co.uk/url?sa=t&so...X8XTmxY8f4nr7A
Or is the second 'v' standing for specific volume?Last edited by Brian_UK; 15-08-2016 at 08:35 PM.
Brian - Newton Abbot, Devon, UK
Retired March 2015
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15-08-2016, 09:39 PM #9
Re: m=V/v
That would be it, specific volume. Why the hell I thought velocity. Thanks Brian.
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15-08-2016, 10:53 PM #10
Re: m=V/v
Oh well, got there in the end, at least one of us knows what you were talking about.
Next time it might be me....Brian - Newton Abbot, Devon, UK
Retired March 2015