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ramesh chaudhary Grade:
        What is the basic principle behind convection?
8 years ago

Answers : (1)

Pratham Ashish
17 Points

convection in the most general terms refers to the movement of molecules within fluids (i.e. liquids, gases and rheids). Convection is one of the major modes of heat transfer and mass transfer. In fluids, convective heat and mass transfer take place through both diffusion – the random Brownian motion of individual particles in the fluid – and by advection, in which matter or heat is transported by the larger-scale motion of currents in the fluid. In the context of heat and mass transfer, the term "convection" is used to refer to the sum of advective and diffusive transfer.....

Convective heat transfer is the mechanism of heat transfer occurring because of bulk motion (observable movement) of fluids. This can be contrasted with conductive heat transfer, which is the transfer of energy by vibrations at a molecular level through a solid or fluid, and radiative heat transfer, the transfer of energy through electromagnetic waves.
As convection is dependent on the bulk movement of a fluid it can only occur in liquids, gases and multiphase mixtures.
Convective heat transfer is split into two categories: natural (or free) convection and forced (or advective) convection, also known as heat advection..

when the heat is carried passively by a fluid motion which would occur anyway without the heating process,this heat transfer process is often termed "forced convection" or occasionally "heat advection .

when heating itself cause the fluid motion (via expansion and buoyancy force), while at the same time also causing heat to be transported by this bulk motion of the fluid. This process is called natural convection......
8 years ago
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