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Question for science people(if any)

post #1 of 7
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hello, i am reading a book about jet engines(yes obviously not related to computer cooling) and its going into massive detail on static pressures and that kind of stuff. because jet engines also use the concept of static pressure(for a different purpose than cooling) BUT I was wondering, can static pressure on a heat sink fan cause a VERY TINY amount of heat from the friction of air? not noticeable? Because in this book its talking about how static pressure can cause heat to occur from the friction of air. Also if this is the wrong thread, Im sorry.
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post #2 of 7
well, im no rocket scientist, but time to use common sense.
jet engines have THOUSANDS of pounds of thrust, with a lot of friction. so yeah that would heat up anything.
but the friction on a little heatsink with a little fan would be so insignificant, it wouldn't make a difference.

it may increase ur temps by 0.00001ºC
    
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post #3 of 7
No. The air isn't moving fast enough to create that much friction.
A jet engine controls the direction of the airflow precisely, whereas a fan on a heatsink just blows the air in a general direction. When the air meets resistance (the heatsink fins and tubes) it just goes to the next most convenient direction, which is the path of least resistance. The air moving through a jet engine doesn't have that option.
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post #4 of 7
Thread Starter 
Quote:
Originally Posted by Enfluenza View Post
well, im no rocket scientist, but time to use common sense.
jet engines have THOUSANDS of pounds of thrust, with a lot of friction. so yeah that would heat up anything.
but the friction on a little heatsink with a little fan would be so insignificant, it wouldn't make a difference.

it may increase ur temps by 0.00001ºC
Well ya, but I wasnt thinking about the exhaust here, im thinking of the air intake, and the comnpressor section(no thrust, just a crapload of static pressure and compression of air) and it builds heat. Thats what i was referring to.
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post #5 of 7
Unless anyone here knows the math behind it, all we can do is speculate.

I can say this- It's obvious the cooling properties of the air are much much greater then any heating effects.
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post #6 of 7
Yo here are some maths. You should look at the pressures, the relative heat capacities of the heated fluid and the thing that is being heat/cooled, and then include some friction numbers if the fluid is moving in one direction vs another. This should get you started.

Van der Waals equation
From Wikipedia, the free encyclopedia
The van der Waals equation is an equation of state for a fluid composed of particles that have a non-zero volume and a pairwise attractive inter-particle force (such as the van der Waals force.) It was derived by Johannes Diderik van der Waals in 1873, who received the Nobel prize in 1910 for "his work on the equation of state for gases and liquids". The equation is based on a modification of the ideal gas law and approximates the behavior of real fluids, taking into account the nonzero size of molecules and the attraction between them.

Equation



where
p is the pressure of the fluid
v is the volume of the container holding the particles divided by the total number of particles
k is Boltzmann's constant
T is the absolute temperature
a' is a measure for the attraction between the particles
b' is the average volume excluded from v by a particle
Upon introduction of the Avogadro constant NA, the number of moles n, and the total number of particles nNA, the equation can be cast into the second (better known) form



where
p is the pressure of the fluid
V is the total volume of the container containing the fluid
a is a measure of the attraction between the particles
b is the volume excluded by a mole of particles
n is the number of moles
R is the universal gas constant,
T is the absolute temperature
A careful distinction must be drawn between the volume available to a particle and the volume of a particle. In particular, in the first equation refers to the empty space available per particle. That is, is the volume V of the container divided by the total number nNA of particles. The parameter b', on the other hand, is proportional to the proper volume of a single particle—the volume bounded by the atomic radius. This is the volume to be subtracted from because of the space taken up by one particle. In van der Waals' original derivation, given below, is four times the proper volume of the particle. Observe further that the pressure p goes to infinity when the container is completely filled with particles so that there is no void space left for the particles to move. This occurs when V = n b.
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post #7 of 7
Any amount of friction will result in heat. A room temperature object with room temperature air blowing across it will be warmed slightly.

Obviously, the ability of that air to remove heat from an object is much greater than the minuscule amount of heat produced, at least at anywhere near the velocities we are talking about.
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