[AT] Airflow calculations of perforated metal for radiator screens
Cecil Bearden
crbearden at copper.net
Fri Jun 18 05:46:22 PDT 2021
Steve:
I remember all that and had to work with it in hydrology and flow
calculations for the last 40 years. However for the last 10 I have had
a computer program available that does all that stuff and all I have to
do is plug in some numbers. Back when I was approving plans for new
construction, I could look at an applications, the spillway size and the
location and ddo it in my head....
Cecil
On 6/18/2021 4:55 AM, Stephen Offiler wrote:
> I haven't done flow calculations in a long, long time, and Fluids was
> not among my favorite subjects back in school... so with that said, my
> gut feeling is that Mark's 56% blockage is probably somewhere in the
> right ballpark but dependent on factors like whether the airflow is
> laminar or turbulent, maybe Reynold's numbers.... now I'm just spewing
> stuff I learned 40 years ago. Mostly to say, there might not *be* a
> good way to calculate this outside of a lab with a flow bench; really,
> the thing to do is try it, and take measurements. No idea if you can
> see high-side pressure while on the road but I doubt it. Any readouts
> for coolant or trans temperatures?
>
> SO
>
>
> On Fri, Jun 18, 2021 at 1:03 AM magreer67 <magreer67 at gmail.com
> <mailto:magreer67 at gmail.com>> wrote:
>
> Wouldn't that be 56% blockage and 44% open to flow through?
> Mark Greer
>
>
>
> Sent from my Verizon, Samsung Galaxy smartphone
>
>
> -------- Original message --------
> From: Cecil Bearden <crbearden at copper.net
> <mailto:crbearden at copper.net>>
> Date: 6/17/21 11:34 PM (GMT-05:00)
> To: at at lists.antique-tractor.com
> <mailto:at at lists.antique-tractor.com>
> Subject: Re: [AT] Airflow calculations of perforated metal for
> radiator screens
>
> The .188 diameter staggered pattern gives .444 sqin hole area over
> a 1 sq in area. So I guess it would result in a 44% blockage.
> However it would be tabout 5 inches from the grille and then the
> A/C condensor sets about 6 inches back from that. I think there
> would be sufficient room to pull air from above and below. It
> just may cause some additional drag at high speeds. I think I
> will try it and make it easy to remove in case it blocks too much
> airflow. I have to do something. Time and ability to work on
> this stuff gets more valuable daily...
> Cecil
>
> On 6/17/2021 7:48 PM, Brad Loomis wrote:
>> The 455 diesel lawn tractor I use at work has a pull out screen
>> ahead of the radiator. I'm not there so I can't measure it. But I
>> will try tomorrow and report back. It does keep the foxtails,
>> thistle, mustard, and whatever else I kick up out of the radiator.
>> Brad
>>
>> On Thu, Jun 17, 2021 at 5:23 PM Cecil Bearden
>> <crbearden at copper.net <mailto:crbearden at copper.net>> wrote:
>>
>> I had to wash the A/C condensor and radiator out on my 2011
>> Chevy truck
>> yesterday before I could make a trip to pick up some auction
>> items. I
>> put the gauges on my a/c system and it showed 35 low and 350
>> high.
>> before I did anything I went to the water hose and got it
>> down to 150
>> pretty quickly on the high side. The amount of bugs was
>> crazy. I will
>> have to remove the radiator and condensor to get them clean
>> as there is
>> no room to get anything in the front or behind the fan. I
>> have one of
>> those heavy cowcatcher style grill guards in the front. This
>> truck has
>> about 170K miles and has made 3 trips to Alaska, so it may
>> have more
>> bugs than usual, but the bugs and thi8stle seeds are terrible
>> here and
>> getting worse. I want to put a piece of perforated metal
>> behind the
>> grill guard to catch the bugs. If it cuts the air down, it
>> can still
>> come in between the screening and the grill. I don't think
>> it will make
>> a lot of difference in the amount of air entering the
>> radiator, but
>> maybe catch the bugs and fluffy crap in the air... When we
>> figure
>> airflow into a home, we cut the flow through a window in half
>> when a
>> screen is used. I am looking at a peforated metal with
>> holes .188in
>> in diameter and offset centers so it gets the most holes per
>> square
>> inch. Does anyone have any experience with this type of
>> screening or
>> have a formula to determine if it will cut the airflow too
>> much. I think
>> the area behind the grill guard and the grill is wide enough
>> to keep
>> from cutting down the air flow. Traveling down the road at
>> 60mph it may
>> deflect some air around the grill instead of through..
>>
>> I just don't want to have to remove this radiator again. I
>> have to use
>> a stepladder to work on the d&%$^d thing it is so tall. It
>> is stock for
>> that year, but the manufacturers want to see how far the
>> drivers can
>> jump to get into a pickup nowdays. I remember a 63 and 66
>> chevy 1/2 ton
>> pickup we worked out of on the farm every day. Hauled 20
>> head of cows
>> in a bumper trailer with no brakes into OKC Stockyards.
>> Loaded 60
>> bushels of wheat to haul to the elevator when the lines were
>> long and
>> the grain truck had not returned. Now, I have a 3/4 ton that
>> I have to
>> jump into or pull myself in with the steering wheel and 30
>> bushels of
>> rye in the bed causes it to squat, with twice as much tire
>> under it than
>> the old ones had.. It doesn't ride all that much better,
>> just cooler
>> when the A/C works. OK rant off.....
>>
>> Cecil
>>
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