- First Name
- Jannick
- Joined
- Jun 3, 2022
- Threads
- 1
- Messages
- 14
- Reaction score
- 40
- Location
- DENMARK
- Vehicles
- Ford Mustang Mach E AWD SR
- Thread starter
- #16
Hi RickMachEHow are heat dissipation openings impacted by salt water / slush sprayed on messy roads?
that’s a very great question and I will try to explain it to you as best as I can.
The way these Heat dissipation openings work is that it’s microporous membranes pressure vents which means.
Inside the pony logo you have:
• LED
• A small driver circuit
• Sealed housing
When the LEDs on the pony are on:
• Electronics generate heat
• Air inside the sealed housing warms up
• Warm air expands
• Pressure inside increases
If there were no vent:
• Pressure would push on seals
• Seals would weaken over time
• Moisture would get sucked in later
So pressure must be controlled.
The vent contains a microporous PTFE membrane
Important properties:
- Millions of microscopic pores
- Pores are much smaller than water droplets
- Surface is hydrophobic (water-repelling)
~0.1–10 microns
Water droplets:
Much larger than that.
When pressure builds inside the logo:
- Air molecules are tiny
- They pass through the pores
- Pressure equalizes
Internal pressure ↑ → air slowly exits → pressure stabilizes
Here’s the clever physics:
Water droplets:
- Are much larger than the pores
- Have surface tension
- Are repelled by the hydrophobic membrane
- The droplet hits the membrane
- Surface tension prevents it from entering
- It beads up and runs off
but now the question is , what about salt water ?
Salt water:
- Still behaves like water in droplet form
- Still too large to pass through
- Salt residue can accumulate on the outside
- That can slightly reduce airflow over many years
- But it does NOT usually cause ingress
sincere
Jannick BSKT engineer Tester
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