Go Back  RX7Club.com - Mazda RX7 Forum > Tech and Performance > Race Car Tech
Reload this Page >

Improve cooling with laminar flow air channels?

Race Car Tech Discuss anything related to road racing and auto X.

Improve cooling with laminar flow air channels?

Old 01-22-15, 04:12 AM
  #1  
Spinning Dorito
Thread Starter
iTrader: (11)
 
rxmiles's Avatar
 
Join Date: Dec 2010
Location: Boulder, Colorado
Posts: 405
Likes: 0
Received 0 Likes on 0 Posts
CO Improve cooling with laminar flow air channels?

I have been doing some reading on laminar flow and how it affects air speed and general channeling through a passage. Now I am very interested to see what the general public thinks as far as this goes. I think it could be a plausible way to increase air flow and efficiency. Directly channeled to the radiator, intercooler, oil cooler(s) etc. There would be a dense cluster of tubes or straws that could be lightweight and cut to angle and length.
Now the radiator is already designed to create laminar flow since air travels through the fins air flow gets directed in a more linear path. Now the problem is the air coming through the front of the vehicles openings. This air is turbulent.



The image in the bottor is a very crude but efficient example.



In similar ways that a catalytic converter works, for the exception of high density clusters.



If this could prove the a cost effective way of improving flow I might toy with the idea.

Any thought and input greatly appreciated
rxmiles is offline  
Old 01-22-15, 11:18 AM
  #2  
(Terraplane)
 
TRRAPLN's Avatar
 
Join Date: Apr 2005
Location: Arizona desert, where the terraplanes roam.
Posts: 342
Received 7 Likes on 5 Posts
Honeycomb diffuser

I don't know if this aids cooling. Maybe someone with experience using this could answer.

Honeycomb Radiator Protector, 19 x 26 Inch - Speedway Motors, America's Oldest Speed Shop


Protection for your radiator: The Nomex Honey Comb Protector, sold by Speedway Motors, offers excellent protection from mud clods, rocks and stones. This is the same stuff the Outlaws use. Its lightweight but very strong, at thick. Place it directly in front of radiator and let it take the beating instead of your aluminum radiator. Some guys have raced a whole season with one honey comb. Usage will vary depending on track conditions. It can easily be cut down to size.
Attached Thumbnails Improve cooling with laminar flow air channels?-honeycomb-radiator-small.jpg  
TRRAPLN is offline  
Old 01-22-15, 12:15 PM
  #3  
www.lms-efi.com
iTrader: (27)
 
C. Ludwig's Avatar
 
Join Date: Mar 2001
Location: Floyds Knobs. IN
Posts: 5,106
Received 30 Likes on 23 Posts
http://www.google.com/patents/US6237680

There is a 15 year old patent that hasn't been utilized by an OE. Guessing it's not a completely viable idea.
C. Ludwig is offline  
Old 01-22-15, 12:33 PM
  #4  
Lives on the Forum
iTrader: (9)
 
BLUE TII's Avatar
 
Join Date: Mar 2001
Location: CA
Posts: 7,081
Received 145 Likes on 128 Posts
Now the radiator is already designed to create laminar flow since air travels through the fins air flow gets directed in a more linear path. Now the problem is the air coming through the front of the vehicles openings. This air is turbulent.


The air traveling through the heat exchanger fins is not laminar flow, but turbulent.

The heat exchanger fins are punched in a way to increase surface area and promote turbulent flow to increase heat transfer at a slight cost to heat exchange medium (air) velocity through the core.

A properly designed duct is indeed one that not only retains air velocity within the duct, but distributes the air evenly over the core. The duct should also help retain air that has entered the duct from being rejected by the face of the heat exchanger.

There is definitely modeling that goes into proper ducting- you can check out the old NACA/NASA reports on it from when airplane engines/heat exchangers became streamlined to get ideas on what works best.

I think your idea has merit in at least the example of a forward facing duct opening leading to a severely angled heat exchanger core. This was found to be an inefficient design in the NACA reports, but often a desirable layout in our cars due to packaging and keeping a thin heat exchanger core cross section due to the relatively low air velocities available.

While you are looking up the NACA ducting reports check into foamed carbon heat exchangers and nano-rod coolants. If you want to push the envelope on cooling you might want to start with the cutting edge heat exchangers/media and their requirements before even messing with traditional exchangers/media.

Part of the problem bringing on the new tech is the traditional ducting/layout/low pressure fans (at least with the foam carbon heat exchangers).
BLUE TII is offline  
Old 01-22-15, 10:44 PM
  #5  
Rotary Enthusiast
iTrader: (19)
 
Join Date: Apr 2002
Location: Colorado Springs, CO
Posts: 1,168
Likes: 0
Received 7 Likes on 6 Posts
Been a long time since college and my heat transfer class.

But i remember turbulant flow being better at removing heat, not laminar flow. Laminar/turbulant flow and the boundary layer using the reynolds number....

heat exchangers already are set up with set ups to create turbulant flow and have the channels to conduct and convet heat through forced convection to the air passing through the heat exchangers.

The conduction is already designed in the radiator, same with the fins to create turbulant flow through the radiator core. the question lies in how do you move the air from one side to the other efficiently. More mass flow means more cooling of the heat exchanger.

Typically ducting is created to create pressure differences to suck air in and have it evacuate out and done so efficiently. Typically this is done with a divergent front with a convergent rear duct. This creates those pressure differentials and sucks the air in and speeds it going out. If designed well it can also minimize drag. Air going in and out is very well thought out on formula 1 cars to reduce drag for better downforce/better MPG, etc, etc, etc, etc.
lOOkatme is offline  
Related Topics
Thread
Thread Starter
Forum
Replies
Last Post
Jeff20B
1st Generation Specific (1979-1985)
73
09-16-18 07:16 PM
SakeBomb Garage
Vendor Classifieds
6
08-09-18 05:54 PM
Ian_D
Single Turbo RX-7's
25
10-14-15 12:31 PM
ZaqAtaq
New Member RX-7 Technical
2
09-05-15 08:57 PM
Frisky Arab
2nd Generation Specific (1986-1992)
5
09-04-15 06:17 PM


Thread Tools
Search this Thread
Quick Reply: Improve cooling with laminar flow air channels?


Contact Us - Archive - Advertising - Cookie Policy - Privacy Statement - Terms of Service

© 2019 MH Sub I, LLC dba Internet Brands

We are a participant in the Amazon Services LLC Associates Program, an affiliate advertising program designed to provide a means for us to earn fees by linking to Amazon.com and affiliated sites.
 
  • Ask a Question
    Get answers from community experts
Question Title:
Description:
Your question will be posted in: