In a pipe, friction along the walls slows the fluid, while at the center of the same pipe, the fluid is at its Maximum speed * .

* The maximum speed is generally estimated as twice the average speed

We can see therefore in reality different speeds for the same section of pipe. To simplify the calculations we use the average speed

The average speed is based on the ratio:

volume flow (m3/s) / section area (sqm) = average speed (m/s)

The average speed in the case of a flow constant leads to the continuity equation

The maximum fluid speed in a pipe is determined by the pressure drop it causes. The duct is not noisy or does not generate additional costs of operation (energy pumping) if the pressure drop remain below 20 mm/m . ( indicative Value meter column of fluid per meters of pipe)

The minimum speed fluid in a pipe is often determined by the sedimentation velocity of particles suspended in fluid. The minimum speed is determined by the price of pipes and installation. Indeed a slow speed leads to low operating costs and pumping but the large diameter pipe, ensuring that low speeds are expensive to purchase and install. It is believed that a practical pressure drop per unit length of 15 mm / m is a good compromise between duct diameter and energy expenditure.

An interface to aid design air handling ducts or water pipes is incorporated into MECAFLUX. So you saving energy and controlling costs / installation.

In fluid mechanics the velocity of the vehicle, object or fluid are considered relative velocity between the object and the fluid.

When you enter a speed setting in Mecaflux you must enter the relative velocity between the object and the fluid

detailed input area parameters in mecaflux