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Trailer Tires Overheating.
On Fri, 31 Oct 2003 13:55:55 GMT, "Mark Browne"
wrote: Rick and I just worked this out for water. In a race car tire that reaches 225 F to 250 F during normal operation, there *is* a phase change in water, from liquid to vapor. The newly introduced water vapor can add a significant component to the partial pressure composition of the tire. The only thing left here is to determine how much liquid water might be found inside a tire in different settings. If there's any liquid water in the race tire/wheel at all, the tire filler and wheel balancer should be fired. At the speed those tires rotate, even a small amount of liquid water (say a few grams) would be noticed as a vibration because the tire would be out of balance. It doesn't get spread evenly around the inside of the tire. Now in the temperature range of interest, operating tire temperatures, are any of the materials you mention (Nitrogen, Argon, Oxygen) undergoing any phase changes? If not, do they show any appreciable deviation from the ideal gas properties in the temperature range of interest? It's pressure as well as temperature that would cause them to deviate from ideal gas properties. And the pressures are not high enough. Typically, you have to go above around 150 psi to notice any deviation from the ideal gas laws. You have to go much higher than that for it to have any appreciable effect. As far as temperature is concerned, they deviate from ideal gas properties at very low temperatures, temps near the phase change to liquid. The higher the temp, the more ideal the gas behaves. If you're only a few degress away from the phase change, you won't notice any deviation from the ideal gas laws.. There is one other way a gas can deviate from the gas laws, and that's at very small volumes. But the container must be so small that the volume of the gas molecules themselves must be a significant portion of the container. That is not the case with a tire. If not, suck it up and move on. Mark Browne P. S. You would not be doing a Jax here, would you? That is, trying to define the problem in such a narrow way as to give yourself a little wiggle room. This is not necessarily a bad thing - some us miss toying with Jax! At first, I thought he was Jax. But Jax at least had the courtesy to confine the things he was wrong about to on-topic subjects. This idiot is all over the spectrum. Steve |
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