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March Designs
and Measurements' News Flash page |
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Latest
news - Have you ever wondered about how gas flows through a hole ? |
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Thought for the
month: "Never raise your hand to a child, it leaves your mid-section
unprotected" - Oscar Wilde. |
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We seem to be getting an increased number of enquiries regarding gas flow and leak detection. In fact I have given a number of lectures and seminars on this subject at a few well known universities. This topic is one of our specialities, however, gas flow is not as straight forward as many think, a hole passing a gas through it produces some interesting effects that changes the predicted flow rate by up to 50% of the calculated flow rate. Besides the gas type there are the dimensions of the hole, the leading and trailing shape of edge to the hole, pressure effects, any groove down the inside of the hole, a burr etc.... In fact if you try calculating the flow rate for a given hole diameter you will be lucky to get within 50% of the true value!! Anyone who tells you its easy is probably lying or just possibly an old hand at 'guessing' roughly the value and adjusting the final dimensions to get the required value! Add to that the
problems with different gases, pressures, temperature, turbulence etc... and its
all still a 'black art'. just another one of my many fascinations! |
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