Sample data from Engineering Database — 375 reference tables, deterministic calculators, and Engineering AI. Sign up free
Fin Efficiency: annular#rectangular#r2r1 2.0
4 to 5
Fin efficiency (eta) vs dimensionless parameter mL for straight, annular, and pin fins — rectangular, triangular, parabolic, and conical profiles
| pk | mL value | L definition | efficiency eta | fin profile | fin type | formula | geometry description | m definition | r2 r1 ratio | tip condition |
|---|---|---|---|---|---|---|---|---|---|---|
| annular#rectangular#r2r1 2.0 | 4 | r2-r1 radial fin height; mL=m*(r2-r1) | 0.1863 | rectangular | annular | (2*r1/(m*(r2^2-r1^2)))*(K1(mr1)*I1(mr2)-I1(mr1)*K1(mr2))/(I0(mr1)*K1(mr2)+K0(mr1)*I1(mr2)) | Annular circular fin of uniform thickness r2/r1=2.0 | sqrt(2h/(k*t)) where t is fin thickness; L=r2-r1 is radial height | 2 | insulated |
| annular#rectangular#r2r1 2.0 | 5 | r2-r1 radial fin height; mL=m*(r2-r1) | 0.1461 | rectangular | annular | (2*r1/(m*(r2^2-r1^2)))*(K1(mr1)*I1(mr2)-I1(mr1)*K1(mr2))/(I0(mr1)*K1(mr2)+K0(mr1)*I1(mr2)) | Annular circular fin of uniform thickness r2/r1=2.0 | sqrt(2h/(k*t)) where t is fin thickness; L=r2-r1 is radial height | 2 | insulated |
What else is in Engineering Database
Iron Engine ↗Engineering AI at ironengine.ai
AI built for engineering. Searches the engineering database, performs calculations, gives source-backed engineering insights.
Get started for free ↗Reference Data375 engineering tablesMaterial properties, pipe and shape dimensions, code tables, and electrical ratings across mechanical, civil, chemical, electrical, materials, and manufacturing engineering.
Browse dataCalculatorsDeterministic engineering calculatorsSizing, checking, and conversion tools that run against the reference tables. Inputs are code-compliant, outputs are traceable to the source standard.
Browse calculators