How to calculate hydraulic mean diameter of twisted oval tube or twisted circular tube?

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Prakash Mallappa Munnoli

Procedure to determine the HMD is well defined in any fluid mechanics and water resource engineering book

since your is a twisted oval or circle you must give sketch and dimensions and how much it is filed then only we can work on it.

Iran E Lima Neto

Hope the attached file helps.

Paul Graham Samuels

My initial approach would be to take the hydraulic radius as the wetted area divided by the wetted perimeter, if necessary averaged over a single twist. The hydraulic mean diameter is then twice the hydraulic radius.