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Old   June 10, 2023, 01:53
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How do you calculate Hydraulic diameter of a catalytic convertor? Does middle section also need to be taken in account?

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Old   June 19, 2023, 16:31
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The hydraulic diameter is used to calculate a representative length-scale for non-circular ducts. So you need to apply a bit of engineering judgement based on the phenomena you seek to model or study.

Do you want to understand the hydrodynamics of the gas in the inlet pipe? Then you can use the pipe diameter. The sudden expansion into the main section is a commonly-studied flow situation.

Surely you have a porous medium representing the catalytic surface. At the microscale, the important representative dimension is the channel hydraulic diameter which you can calculate easily. But this is an entirely different problem then the bulk flow in the duct.
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