Timeline for Why is the fan efficiency zero at high flow rate?
Current License: CC BY-SA 4.0
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| when toggle format | what | by | license | comment | |
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| Mar 24 at 12:36 | vote | accept | GRANZER | ||
| Mar 23 at 17:00 | history | edited | GRANZER | CC BY-SA 4.0 |
added 1 character in body
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| Mar 23 at 15:42 | answer | added | TimWescott | timeline score: 1 | |
| Mar 23 at 14:31 | comment | added | Pete W | The mathematical expression explains it. The dimensionless expression for efficiency you show implies, at the right end of the curve, that the fan is consuming power to keep turning, but is not adding any power to the air flow. I.e. an external device would be doing the work to blow the air into the input already at the maximum velocity. This efficiency expression is dimensionless, which is nice for theory. You could use another figure of merit, such as air flow per power input, for a particular input and output condition (eg open air, or in some duct geometry that your system has). | |
| Mar 23 at 14:25 | history | edited | Transistor | CC BY-SA 4.0 |
MathJAX _ is used for subscript. Escape it with a \ if you want the _ to appear.
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| Mar 23 at 14:17 | history | asked | GRANZER | CC BY-SA 4.0 |