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Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

(OP)
Hello,

Has anyone used Fried and Idelchik's book "Flow Resistance - A design guide for engineers"?

I am trying to calculate the pressure drop through a bed of packed spheres as per chapter 8 "Resistance Coefficients of Grids, Screens, Porous Layers and Packings". The case I am interested in introduces variables T_av, T_exit, T_in etc etc however there is no mention of what this property is in the nomenclature. Being "T", it seems like it may be temperature but I can't see how this would have an effect on the resistance coefficient as this is surely accounted for in the kinematic viscosity term used earlier.

Regards

Paul

RE: Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

I have the french version, where the same values are indicated as tmoy, tsort, tent.
These are indeed temperatures, as defined in 8.1.
They define an additive loss coeff (see 8.2-16) that's only relevant when calculating tube bundles with heat exchange.

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RE: Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

(OP)
Thanks,

Perhaps I have missed something or have a different version, but I can't seem to see any definition of temperatures in 8.1, or desciption of the additive loss coeff. (My 8.2 Diagram 16 is packing of wooden laths).

However as there is negligible temperature change across the bed, the term now becomes zero.

 

RE: Pressure Drop Calculation - Idelchik - Flow Resistance -A design guide

Paul, an alternative approach would be to use the Ergun Equation or a derivative of that. This is the approach that a chemical engineer would take in designing a packed bed as an absorber or reactor. Google will locate plenty of online material, or if you have access to a library (or friendly chemical engineer) there is an excellent treatment of this subject in Coulson and Richardson's Chemical Engineering Series Volume 2 (Latest version is by Harker, Richardson and Backhurst).

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