Hydraulic Diameter

adarshfoam · June 10, 2023, 01:53

How do you calculate Hydraulic diameter of a catalytic convertor? Does middle section also need to be taken in account?

jmt_HX · June 19, 2023, 16:31

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.

June 10, 2023, 01:53	Hydraulic Diameter	#1
adarshfoam New Member Adarsh Join Date: Oct 2019 Posts: 5 Rep Power: 5	How do you calculate Hydraulic diameter of a catalytic convertor? Does middle section also need to be taken in account?

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June 19, 2023, 16:31		#2
jmt_HX New Member Join Date: Apr 2023 Posts: 3 Rep Power: 2	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.