An example of a Lab Report that involves progress updates, data analysis, and model/graph creation for perspective and conceptual understanding.

1. • 1. Start taking Atomization and Contact Angle data on all surfaces using variable We
numbers.
• We=p𝑣2
l/σ=p2aΔyl/σ
• p=1000kg/𝑚3,a=9.8m/𝑠2, Δy=droplet height(m), l=.0023511m(average droplet
diameter), σ=72*10−3
N/m(water/air room temp)
0
100
200
300
400
0 10 20 30 40 50 60
WeberNumber
Droplet Height(cm)
Calculated Weber Number vs. Droplet
Height(cm)
0
100
200
300
0 10 20 30 40 50
WeberNumber Droplet Height(cm)
Measured Weber Number vs. Droplet
Height(cm)
y=6.4x Y=5.2x
Austin Fieldsted
5/3/18

2. Calculated
Weber
Number
Droplet
Height(cm)
105 16.5
108 17
110 17.25
112 17.5
115 18
131 20.5
147 23
166 26
166 26
172 27
194 30.5
210 33
217 34
229 36
287 45
300 47
Droplet
Height(cm)
Measured
Weber Number
16.5 94
17 96
17.25 96
17.5 105
18 105
20.5 121
23 130
26 142
26 149
27 155
30.5 177
33 188
34 184
36 200
45 242
47 253
Red lines indicate
droplet heights
identified for the
desired Weber
Numbers
Increasing Droplet
height by 9-10 cm
results in an
increase in Weber
Number of about
50

3. • In the process of identifying droplet heights that will result in Weber Numbers of
100, 150, 200, and 250
• Just finished designing new setup
• Limitations of old setup were:
• 1. Maximum height which only yielded a Weber Number of around 180
• 2. Adjusting the height between Weber Numbers also caused a slight rotation which
results in a change of distance and position of the droplet relative to the camera.
This necessitates a lengthy preliminary calibration time between each Weber
Number that can be avoided by adding a slide rail to our setup

4. • Our current setup is much easier than before to control motion in the X, Y, and Z
axes
• Chunfang helped with the design and assembly
• It is called “The Crane”

5. NEXT STEPS:
• 1 more day of testing previously identified droplet heights to ensure that desired
Measured Weber Numbers are consistent within a margin of plus or minus 5
• Take impingement data on all surfaces starting with Weber Number=100, then
increase Weber Number in increments of 50 until impingement data has been taken
on every surface up to Weber Number=250

6. CONCLUSION:
• My last day in the lab for the summer is Thursday, May 10
• Preston’s wedding was great
• Chunfang and I ate steak and shot guns afterward