A high school design project.

1. An Improved
personal
cellphone fan
Jansen Hombre
Tech - X

2. Is summer getting too
HOT for you?
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3. NO WORRIES!
You can now keep cool with
a simple equation and a
cellphone fan
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4. The original design has been improved using the following:
⬗ Blender
⬗ Ultimaker Cura
⬗ Inkscape
These programs were utilized to create an enhanced prototype
that was subject to testing. Injection molding will also be
applied for the purpose of making this design possible for
world wide production.
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5. So what equation
did I use for this
project?

6. “
SP = 3.43 × 10-9
× rpm ×
ZB
× CL
× l × W
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7. SP = 3.43 × 10-9
× rpm × ZB
× CL
× l × W
where:
⬗ SP = Static Pressure
⬗ rpm = revolutions per minute
⬗ ZB
= number of blades
⬗ CL
= Lift coefficient
⬗ l = blade width
⬗ W = Air velocity relative to the rotating blade
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8. Purpose of this equation
Static pressure is used to evaluate the amount of impact of various
ventilation system components on the airflow path within a given
system. I focused on increasing the static pressure by adding the
number of blades and widening the tip of each blades. The lift
coefficient and size of the blades were based on cooling fans.
However, the rpm depends on the speed of the given motor.
Additionally, the air velocity is also dependent on the spacing
between the fan blades due to the path of the wind.
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9. BLENDER
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10. Blender
“Blender is the free and open source 3D creation suite. It
supports the entirety of the 3D pipeline—modeling, rigging,
animation, simulation, rendering, compositing and motion
tracking, even video editing and game creation.”
This was used to edit and modify the fan blade that can emit a
wind output stronger than the original design.
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11. Fan blade
As shown this figure, I maximized
the number of blades around the
circle. The angle of the blade and
its shape were based off of the
cooling fans of a computer. Lastly,
the blade width is just similar to
the original commercialized
cellphone fan blade design.
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12. ULTIMAKER
CURA
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13. Ultimaker Cura
“Ultimaker Cura prepares your model for 3D printing. For
novices, it makes it easy to get great results. For experts, there are
over 200 settings to adjust to your needs. And integration with
major software platforms makes 3D printing even simpler.”
This was used to make the softcopy ready for 3D printing.
Settings were also fixed to make the printing compatible to the
Chipass, a 3D printer.
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14. 3D printing
This design has measurements
consisting of a 9 cm radius and
a height of 1.35 cm for the fan
blades. This took around 2.5
hrs of 3D printing.
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15. INKSCAPE
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16. Inkscape
“Inkscape is an open-source vector graphics editor similar to
Adobe Illustrator, Corel Draw, Freehand, or Xara X. What sets
Inkscape apart is its use of Scalable Vector Graphics (SVG), an
open XML-based W3C standard, as the native format.”
This was used to make and print the casing for the improved
personal fan, which served as a handle and protection for the
fan blades.
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17. Case
Wind from the fan actually comes
from its behind and sides. I
thought of a design that would
release a large output of air which
being as stable as possible. The
measurement of its radius is 10
cm.
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18. MY DESIGN:

19. Purpose
My aim is to:
⬗ Utilize the 3D printer and laser-cutting machines to model
different designs for the cellphone fan blades
⬗ Design a fan that will release a stronger wind output
⬗ Create an ideal prototype before subjecting it to injection
molding
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20. Results
Through testing, it has been observed that my fan design is
weaker than the original one. Probable causes would be:
⬗ Too many blades, hence reducing the amount of space for
the wind to pass by.
⬗ The material used is not as flexible as the original design.
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21. Another experiment
I took in consideration the problem of the number of fan blades
and made another design. In this design, I increased the width
of the blades and lessened the number into three (3) blades.
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22. NEW DESIGN

23. Results
Unfortunately, this model was weaker than the first fan. To
reflect on my experiences, I have learned that through this kind
of modelling, we can make a lot more fan designs to test with.
Future prototypes may create the most optimal fan blade
design, which can be subjected to injection molding to make
the material rubber and be mass produced for the public.
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24. Addons
So after finishing the aims of my project, I might as well add
more to it. Since we know that the wind of the fan comes from
its sides and its back, I tried attaching a piece of a plastic bottle
pierced with a lot of holes and filled with ice cubes. With this
set-up, we can assume that the wind will be cooler.
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25. NEW SET-UP

26. Results
The phone fan worked, but not as efficient and as strong as I
had initially hoped.
I would recommend to construct two plastic bottles containing
ice cubes to be placed on either side of the device. The holes
should also be slightly bigger to serve as a better passageway
for the wind from the ice cubes to the fan.
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27. “
THE END
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28. References
http://proceedings.asmedigitalcollection.asme.org/proceeding.aspx?articleid=1637888
Izadi, M. J., & Falahat, A. (2008, January). Effect of Blade Angle of Attack and Hub to Tip Ratio on Mass Flow
Rate in an Axial Fan at a Fixed Rotational Speed. In ASME 2008 Fluids Engineering Division Summer Meeting
collocated with the Heat Transfer, Energy Sustainability, and 3rd Energy Nanotechnology Conferences (pp.
903-913). American Society of Mechanical Engineers.
https://www.researchgate.net/profile/Gianluca_Argentini/post/Forward_and_Backward_curve_fans_efficiency_and_
noise_level/attachment/59d656ad79197b80779ad592/AS:531180421423104@1503654689240/download/Bleier+-+
Fan+Handbook.pdf
Bleier, F. P. (1998). Fan Handbook: selection, application, and design (pp. 7-37). New York: McGraw-Hill.
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29. References
Blender:
https://www.blender.org/
Ultimaker Cura:
https://ultimaker.com/en/products/ultimaker-cura-software
Inkscape:
https://inkscape.org/en/about/overview/
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