Why does the temperature rise after throttling high-pressure hydrogen and helium?
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I would like to ask fellow sailors: why does the temperature rise when high-pressure hydrogen and helium are throttled? What is the fundamental principle? (Why is the Joule-Thomson coefficient less than 0, and why is a heat effect produced?) ）
This conclusion seems to be problematic. The ambient temperature after throttling should be considered. A common and straightforward example to refer to is when the valve on an oxygen cylinder is fully opened, or when the valve on a carbon dioxide fire extinguisher is fully open – in such cases, frost will form on the valve within a short time. However, there is a phenomenon in which an excessively high oxygen flow rate can cause wear and heating at the throttle area, leading to an explosion. It is best to understand these two concepts separately for reference.
Thank you. The conclusion should be correct; all the data support this conclusion. However, it doesn’t explain why. Everyone mentions the Joule-Thomson coefficient, but no one addresses the issue at its core
It is easy to understand based on the ideal gas law.