Question

Define convection....​

Answer 1

Convection is single or multiphase fluid flow that occurs spontaneously due to the combined effects of material property heterogeneity and body forces on a fluid, most commonly density and gravity.

Answer 2

Convection is a heat transfer process in which heat energy is transferred by the bulk movement of molecules in fluids such as gases and liquids.

Explanation:

• Diffusion, advection, or both are used to transfer heat by convection. Solids do not experience convection because their basic particles do not move.

• Convection heat transfer is the process of heat transmission between a surface and a liquid or fluid that is in contact with the surface. When transporting heat from one liquid to another via a barrier, convection is crucial.

• Convectional heat transmission happens either through thermal diffusion (fluid molecule mobility) or advection, in which heat is transported through the bulk motion of heat currents in the fluid.