[AT] Carburetor Icing (Off Topic) and last post, I hope

[Gene Dotson]

    Larry;
    Odd you didn't see it, so here it is again....... Gene




WIND CHILL
      The effect relating to bare skin and removal of heat above what would
normally occur, by removing                             the normal boundary
layer, or blanket layer next to the body. This is hastened by rapid air
movement on the body.

VENTURI EFFECT
    The characreristic of low pressure air to hold less heat than higher
pressure air.  Air passing the throttle plate and especially the carburetor
venturi increases in velocity and decreases in pressure. This causes a much
lower temperature downstream, causing moisture in the low pressure air to
condense and, when conditions prevail, to freeze, as low temperature and low
pressure air is not capable of of suspending as much water vapor as at
higher temperature and pressure

 COMPRESSIVE HEATING AND COOLING.
    As compared to ambient air, when air is compressed the temperature rises
and when the pressure is lowered the temperature lowers. Each molecule
contains a specific amount of heat and when they are crowded together, the
heat is concentrated, This is why your air compressor is hot while it is
running and your gloves freeze to the air grinder when used heavily.

EVAPORATIVE COOLING.
    When water is exposed to air that is below the saturation point, the
water partially evaporates, giving up heat to the atmosphere thereby
lowering the temperature allowing the remaining water to freeze as frost,
even at 38 degrees.

COLD SOAKING
    As applies to machinery, is when the entire assembly has reached near
the same low temperature as the surrounding atmosphere. The time interval
can vary widely, depending on air movement and protective measures, such as
a closed barn or covered with a blanket. The actual time can be a few hours
or even days. This will actually be a paraballic curve where fastest cooling
is when the temperatures differences are greatest  and actually never quite
reaching the actual ambient temperature though will come close.

RELATIVE HUMIDITY
    This is the percentage of water vapor in suspension as compared to the
amount of totally saturated air at that particular temperature. RH is
calculated by using identical thermometers. One is dry and records the
actual temperature of the air, and the other has a mediam saturated with and
suspended in water. The EVAPORATIVE COOLING causes the wet bulb to read
lower temperature and by using an index table comparing the temperatures to
arrive at the relative humidity expressed in percentage saturation at that
temperature. Higher moisture air will have a lower temperature spread in
this exercise.

Note
    All of these descriptions are my own feeble effort to try to clear up
some of this discussion, and may contain errors or vague descriptions and
are worth whatever you want to make of them.

                    Gene




----- Original Message ----- 
From: "Larry D Goss" <rlgoss at evansville.net>
To: "Antique tractor email discussion group" <at at lists.antique-tractor.com>
Sent: Monday, December 10, 2007 10:24 PM
Subject: Re: [AT] Carburetor Icing (Off Topic) and last post, I hope


> Humm.  I didn't see it, Gene.  That could mean any number of things
> 1) you didn't write it
> 2) it got short circuited along the way
> 3) I accidentally erased it
> 4) I've slept since then
>
> Any combination of the above could have happened.  Number 4 is the most
> likely explanation.  :-)
>
> Larry
>
> ----- Original Message ----- 
> From: "Gene Dotson" <gdotsly at watchtv.net>
> To: "Antique tractor email discussion group" 
> <at at lists.antique-tractor.com>
> Sent: Monday, December 10, 2007 3:55 PM
> Subject: Re: [AT] Carburetor Icing (Off Topic) and last post, I hope
>
>
>>    Larry;
>>    This is a good observation and is an example of evaporative cooling. I
>> posted this in one of my previous posts. Didn't get any responses to that
>> post, so don't know if nobody read it, or if it just didn't jive with
>> their
>> preconcieved notions.
>>
>>                        Gene
>>
>>
>>
>> ----- Original Message ----- 
>> From: "Larry D Goss" <rlgoss at evansville.net>
>> To: "Antique tractor email discussion group"
>> <at at lists.antique-tractor.com>
>> Sent: Monday, December 10, 2007 2:52 PM
>> Subject: Re: [AT] Carburetor Icing (Off Topic) and last post, I hope
>>
>>
>>> It's interesting that you should mention that, George, because there are
>>> times when I empty a gas tank into an open steel pan, and the vapor
>>> pressure
>>> of the gasoline is low enough that with the wind blowing across the top
>>> of
>>> the pan, the gas cools off and condensate forms on the outside of the 
>>> pan
>>> from moisture out of the air.  I probably shouldn't have mentioned this
>>> because it will be used as an example of wind chill.  The fact that you
>>> are
>>> talking about closed vessels where the vapor pressure equalizes will 
>>> also
>>> be
>>> overlooked.   :-)
>>>
>>> I'm sorry to make "just one more post."  The devil made me do it.
>>>
>>> Larry
>>
>> _______________________________________________
>> AT mailing list
>> http://www.antique-tractor.com/mailman/listinfo/at
>>
>
>
> _______________________________________________
> AT mailing list
> http://www.antique-tractor.com/mailman/listinfo/at
>