Wetted Surface Area Calculator

The Wetted Surface Area formula is a function of radius of inner cylinder and length of cylinder. In maritime use, the wetted area is the area of the hull which is immersed in water. This has a direct relationship on the overall hydrodynamic drag of the ship or submarine. Literally how much of the pipe cross-section is “wet” or in contact with the fluid. Let’s say you have a very large sewer pipe under the road. The “wetted” area is only a small portion at the bottom and it should only be fairly full in cases of heavy rain. Now, in a siphon, in which the pipe has to be “primed” so that continuity of flow will make the fluid go from high to lower hydraulic grade, the entire cross-section of the pipe is wetted (ie, in contact with the fluid) or else it doesn’t maintain the siphon is calculated using Wetted Surface Area = 2*pi*Radius of Inner Cylinder*Length of Cylinder. To calculate Wetted Surface Area, you need Radius of Inner Cylinder (R) & Length of Cylinder (L_Cylinder). With our tool, you need to enter the respective value for Radius of Inner Cylinder & Length of Cylinder and hit the calculate button. You can also select the units (if any) for Input(s) and the Output as well.