What is the Difference between Natural and Forced Flow?

In fluid mechanics and heat transfer, there are different classifications of fluid flows according to the different aspects. One of these classifications is the natural flow and the forced flow of fluids. According to this difference, the calculation method and approach change both for fluid mechanics and heat transfer. 

Fluid flow(Image Source: Pixabay.).

What is Natural Flow? 

The natural flow of the fluid takes place with the buoyancy effect between fluids. In the buoyancy effect of the fluids, the warmer fluid flows to the upper side and the cold fluid flows to the below side. This place exchange between the fluids because of the temperature difference is called as buoyancy effect and the fluid flows because of the buoyant effects are called natural flows. 

What is the Forced Flow of Fluids? 

The forced flow of fluids is commonly used in most mechanical systems. As its name implies that in the forced flow mechanism, flow takes place with the external force such as pumping the fluid through the piping systems or flowing air with fans through systems to be cooled. 

In general, engineers are using forced flow calculations in most practical engineering calculations. Force flow effects are very important in heat transfer also. 


The main difference between the forced flow and the natural flow in fluid mechanics and heat transfer is very simple like above. 

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