4.
Vertical Velocity versus Diameter (Full Screen)
The full screen
representation of the diagram "Velocity versus Diameter" can be
selected from the Main Screen by moving the mouse cursor on top of the
according diagram icon and doubleclick the left mouse button.
4.1
Menu Buttons
button: RUN
Pushing this
button draws the diagram for the given filter settings. A pixel is set for each
drop at the corresponding (equivolumetric sphere diameter, velocity) position.
The mouse cursor changes its appearance to an hourglass cursor in Run-mode, and
the RUN button toggles to be the STOP button. Run-mode can be terminated by
pressing the STOP button.
button: MAIN
Pushing this button returns control to the Main Screen.
button: HELP
Pushing this
button displays this window.
button: COMP
If this button is
pushed, two graphs taken from the literature and showing the relation between
equivolumetric sphere diameter and drop velocity will be drawn.
4.2
Diagram Header
The diagram header
contains information on filter settings and also includes the following fields:
4.3
Comparison with Literature Models
The graphs taken from the literature for velocity versus equivolumetric
sphere diameter are:
4.3.1
Vertical velocity versus diameter after Atlas et al. (1973)
where:
v ... vertical fall velocity of raindrop (m/s)
D ... equivolumetric sphere diameter (mm)
4.3.2 Vertical velocity versus diameter after Gunn and Kinzer (1949)
Diam. |
0.1 |
0.2 |
0.3 |
0.4 |
0.5 |
0.6 |
0.7 |
0.8 |
0.9 |
1.0 |
1.2 |
1.4 |
1.6 |
Veloc. |
0.27 |
0.72 |
1.17 |
1.62 |
2.06 |
2.47 |
2.87 |
3.27 |
3.67 |
4.03 |
4.64 |
5.17 |
5.65 |
Diam |
1.8 |
2.0 |
2.4 |
2.8 |
3.2 |
3.6 |
4.0 |
4.4 |
4.8 |
5.2 |
5.6 |
6.0 |
6.5 |
Veloc. |
6.09 |
6.49 |
7.27 |
7.82 |
8.26 |
8.60 |
8.83 |
8.98 |
9.07 |
9.12 |
9.16 |
9.17 |
9.18 |