/sci/ - Science & Math

>>11478886
>Is that not the relevant area in the equation?
No lol. It's the area of the solenoid. In the pic in >>11478847 it's the rectangular x-sectional area of the core.

>>11380289
>>11380300
At this rate I request to be formally listed as a co-author, or at least in the references. The reason you are calculating different mass flow rates is because the density of air changes slightly throughout the duct as it encounters obstacles. Air is very much a compressible substance. I promise you, however, that real, true mass flow rate IS constant throughout the duct. The volume flowrate, however, definitely isn't constant (contrast this with how water typically behaves in a pipe).
>losses
Yep. There's energy losses due to viscous friction with the air against the duct (called major losses) and also losses due to interactions with changes in geometry (called minor losses). Once again, you find major and minor losses in tables.