ML-e
1 open axial grooves; 2 sinter structure, 3 wick or mesh structure
Tilted heat pipe
Wetting angles for various fluids
|
Fluid |
Wetting angle ϑ |
|
Water |
40° - 45° |
|
Hydrocarbons |
ca. 35° |
|
Ammonia |
20° - 25° |
Minimum effective radii of curvature
|
Capillary structure |
R eff,min |
Geometric parameter |
|
|
Circular atrery |
R |
R |
Radius of artery |
|
Rectangular groove |
w |
w |
Groove width |
|
Triangular groove |
w/cos β |
w |
Groove width |
|
β |
Opening angle |
||
|
Screen wicks / meshes |
(w + d)/2 or 1/(2N) |
w |
Mesh width |
|
d |
Wire diameter |
||
|
N |
Mesh number per unit length |
||
|
Sintered powders |
0,41 R |
R |
Particle radius |