Water Tunnel Flow Visualizations - Page 2 - Fuelly Forums

Android Users - Coming Soon! - Migrating from aCar 4.8 to 5.0

Thread Tools Display Modes
Old 04-06-2007, 12:21 PM   #11
Registered Member
Join Date: Mar 2007
Posts: 1,138
Country: United States
Originally Posted by red91sit View Post
I used to dream of building one of these in my room haha, but decided the lack of compressability would make it not so worth while?
Like Trebuchet03 said, the lack of compressability is no big thing. If you want to satisfy yourself, get an aeronautics textbook and see what kind of speeds they are talking about before they start talking about a compressability factor, or have some sort of integration applied to the density, or something like that.

Bill in Houston is offline   Reply With Quote
Old 03-20-2008, 09:53 AM   #12
Registered Member
Join Date: May 2007
Posts: 200
Country: United States
I have used a Shop-Vac and 2" yarn tufts to visualize flow on a full size car.

The problem is the air become stagnant very quickly, so you cannot use it for areas larger than around a foot.
Testing on the front and sides of the car was useful, but there is not enough velocity to test the areas around the back of the car.

Tuft testing the car on the road showed that the ShopVac testing was accurate.

I have thought of creating a wind tunnel using a ShopVac and an enclosed length of PVC pipe.
The Shop Vac would be sealed so that one side of the pipe would blow , and the other suck ) I still have to find a model of my car ( A 1993 Civic hatchback ) that is a useable scale though. So far all that I have found is a 1:24 madel.

As far as using water as a visualization tool, why not just take a length of pipe and a model car into the pool with you the next time that you go swimming ?
If you unhook the pool pump and attach it so that it cycles the flow back and forth, it seems like it could be useful.

Nerds laugh at me is offline   Reply With Quote
Old 03-20-2008, 09:56 AM   #13
Registered Member
Join Date: May 2007
Posts: 200
Country: United States
Is that pink thing on the third of fourth picture .... what I think it is ????
( It seems to be slightly arroused in the picture that follows. )
Nerds laugh at me is offline   Reply With Quote
Old 03-20-2008, 10:18 AM   #14
Registered Member
GasSavers_RoadWarrior's Avatar
Join Date: Feb 2008
Posts: 1,652
I've been trying to figure something out with my bathtub. I'm thinking a weight and pulley arrangement to draw a model through water a measured distance in a measured time would make for some useful data. Also might be possible to find some neutral buoyancy colored beads, so one could get some flow visualisation out of it too. Can't think of a convenient material to make the models in though... or scale, 1:43 is a tad small still, 1:20 would be more like it... but then there's issues with the bath being deep enough....

I for one won't worry tooooo much about the compressibilty of air compared to water until I have my speedo marked out in Mach numbers... (i.e. worry about that when you're planning 350mph and faster)
I remember The RoadWarrior..To understand who he was, you have to go back to another time..the world was powered by the black fuel & the desert sprouted great cities..Gone now, swept away..two mighty warrior tribes went to war & touched off a blaze which engulfed them all. Without fuel, they were nothing..thundering machines sputtered & stopped..Only those mobile enough to scavenge, brutal enough to pillage would survive. The gangs took over the highways, ready to wage war for a tank of juice
GasSavers_RoadWarrior is offline   Reply With Quote
Old 03-20-2008, 03:40 PM   #15
Registered Member
Join Date: Dec 2007
Posts: 170
Country: United States
You may have more success in finding a model of the Suzuki Swift the Geo was based on.
Several appeared in a quick Google search.

Cheers , Pete.

GasSavers_Pete is offline   Reply With Quote

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

Similar Threads
Thread Thread Starter Forum Replies Last Post
Fuel type selection timk Fuelly Web Support and Community News 7 03-05-2010 12:22 AM
More detail josh434 General Fuel Topics 2 06-28-2009 02:39 AM
Moped/Scooter as Generic Makes Ichamb Fuelly Web Support and Community News 1 11-06-2008 04:45 AM
San Jose Police overinflate tires to 50 PSI to improve performance and have realized significant cost savings..... krousdb General Fuel Topics 10 04-23-2006 04:15 PM
Crazy Spark Plugs Claim Increase of 50% in Gas Mileage SVOboy General Fuel Topics 13 12-29-2005 05:36 AM

Powered by vBadvanced CMPS v3.2.3

All times are GMT -8. The time now is 03:55 AM.

Powered by vBulletin® Version 3.8.8 Beta 1
Copyright ©2000 - 2018, vBulletin Solutions, Inc.