I Dust sticking to fan blade downstream of rivet head

  • I
  • Thread starter Thread starter Swamp Thing
  • Start date Start date
  • Tags Tags
    Dust Fan Head
AI Thread Summary
Dust accumulates on fan blades downstream of rivet heads due to reduced pressure and airflow velocity in those areas, creating a comet-tail effect. This phenomenon contradicts Bernoulli's principle, which states that an increase in velocity should lead to a decrease in pressure, causing confusion among observers. Flat-headed rivets are less common and contribute to turbulence, drawing air into low-pressure zones. Recessed rivets, while more costly, enhance aerodynamic efficiency by increasing speed and reducing fuel consumption. Understanding these dynamics is crucial for optimizing aircraft design and performance.
Swamp Thing
Insights Author
Messages
1,033
Reaction score
770
Why does dust stick to the fan blades just downstream of the rivet heads, forming a comet-tail like effect?

IMG_20220629_150011~2.jpg
 
Physics news on Phys.org
It is an area of turbulence, into which air is drawn by lower pressure.
Velocity may increase, but in a chaotic way and in circular trajectories.
Same should happen over the thick trailing edge of each wood or plastic blade.

Recessed rivets are more expensive, but those make top speed increase and fuel consumption decrease.
Please, see:
https://en.wikipedia.org/wiki/Hughes_H-1_Racer#Design

 
Reply
  • Like
Likes Swamp Thing and dlgoff

Thread 'Please Explain Elementary Physics Elevator Question'

Hello, I'm joining this forum to ask two questions which have nagged me for some time. I am in no way trolling. They both are presumed obvious, yet don't make sense to me. Nobody will explain their positions, which is...uh...aka science. I also have a thread for the other question. Yes, I'm questioning the most elementary physics question we're given in this world. The classic elevator in motion question: A person is standing on a scale in an elevator that is in constant motion...
View full post »
Thread ''splain this hydrostatic paradox in tiny words'

Thread ''splain this hydrostatic paradox in tiny words'

This is (ostensibly) not a trick shot or video*. The scale was balanced before any blue water was added. 550mL of blue water was added to the left side. only 60mL of water needed to be added to the right side to re-balance the scale. Apparently, the scale will balance when the height of the two columns is equal. The left side of the scale only feels the weight of the column above the lower "tail" of the funnel (i.e. 60mL). So where does the weight of the remaining (550-60=) 490mL go...
View full post »

Thread 'Coulomb gauge implies instantaneous radial electric field?'

Scalar and vector potentials in Coulomb gauge Assume Coulomb gauge so that $$\nabla \cdot \mathbf{A}=0.\tag{1}$$ The scalar potential ##\phi## is described by Poisson's equation $$\nabla^2 \phi = -\frac{\rho}{\varepsilon_0}\tag{2}$$ which has the instantaneous general solution given by $$\phi(\mathbf{r},t)=\frac{1}{4\pi\varepsilon_0}\int \frac{\rho(\mathbf{r}',t)}{|\mathbf{r}-\mathbf{r}'|}d^3r'.\tag{3}$$ In Coulomb gauge the vector potential ##\mathbf{A}## is given by...
View full post »

Similar threads

I Help me understand heating/cooling principles
Replies
1
Views
1K
I Dust Accumulation on Fan Blades and Elsewhere
Replies
7
Views
3K
Misc. Rowing: does every oar need a blade?
Replies
20
Views
2K
I need a small fan to push a lot of air because my bigger fan is too loud
Replies
10
Views
4K
I Magnets, Outer space, and Rings
Replies
3
Views
1K
A What does it mean to model the distribution of galaxies as cosmic dust?
Replies
6
Views
3K
Stargazing Spotting Meteorites: Unveiling the Mystery of Annual Showers
2
Replies
50
Views
4K
I How to find the change in volume of a solid to a liquid
Replies
3
Views
1K
I Fans with 3 blades vs. 6 blades (noise, efficiency)?
Replies
18
Views
20K
A Wooden vs iron sword causing bone fracture
Replies
6
Views
2K

Hot Threads

Recent Insights

Back
Top