What is a free convection?
Free convection, also known as a natural convection, is a phenomenon that occurs when liquid or gas moves due to changes in the density that occurs inside rather than in response to external movement, such as a fan or turbine. Natural convection is surprising that in nature, where it plays a role in a number of different natural processes, and can also be seen in the environment controlled by man, from kitchen to chemistry laboratory. This differs from forced convection, in which the movement is forced to move the device, such as the fan, as seen in the convection furnace. One area becomes warmer than the rest, loses density and begins to rise and creates a small current. As it rises, heat is transmitted to the surrounding colder liquid. Currents and beliefs appear. In a simple example of natural convection, if one drops hot water stained with food color into a clear glass bowl with a unsuccessful cold water, it will be possible to monitor the movement of the colored water until the mixture is unstabated and moves.
Newton's Cooling Law plays a decisive role in free convection. According to Newton, the temperature speed in the fluid can be considered as proportional to the difference between the liquid and the surroundings. This affects free convection because the changing temperatures create instability, leading to free convection. For example, weather systems are strongly influenced by the movement of hot and cold air, which are influenced by sunlight, contact with cold water, etc.
The circulation of world oceans is a direct result of free convection. When the water moves towards the poles, it cools and more compacted and descends towards the bottom. Meanwhile, the water moving towards the equator warms up and becomes lighter and rises to the surface. This creates a series of complex currents across the ocean that creates continuous circulation and keep water in the ocean in constant movement.
Convection theory also explains other natural processes such as the movementTin under the Earth's peel. The shift of liquids under our legs plays a role in a number of natural processes, while these fluids are constantly moving due to changes in temperature inside the ground. Competitive currents can also intersect, as shown in the interaction between the ocean and the weather systems above the ocean, which are influenced by changes in the temperature caused by the movement of ocean streams.