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**hydraulic diameter**is calculated as 4 timesthe flow area divided by the wetted perimeter of theconduit.

In respect to this, how do you calculate the hydraulic radius of a pipe?

**Hydraulic radius** is the area of the water prismin a **pipe** or channel divided by the wetted perimeter. Thus,for a round conduit flowing full or half full, the **hydraulicradius** is d/4. **Hydraulic radius** measures the flowefficiency of a **pipe**.

**Hydraulic radius**is defined as the area of theflow section divided by the wetted perimeter, whereas,

**Hydraulicmean**depth is defined as the area of the flow section dividedby the top water surface width.

In this manner, what is hydraulic diameter how is it defined what is it equal to for a circular pipe of diameter D?

Answer: **Hydraulic diameter** is **defined** asit is ratio of cross sectional area of the **pipe** to wettedperimeter of the **pipe**. This parameter useful to determinedthe Reynolds number for laminar or turbulent flow.

Shell side **Equivalent** (Hydraulic)**Diameter**. **Equivalent diameter** employed by Kern forcorrelating shell side **heat transfer**/flow is not a true**equivalent diameter**. The direction of shell side flow ispartly along the tube length and partly at right angles to tubelength or **heat exchanger** axis.