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* In one of two major types of heat convection, 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." * In the other major type of heat convection, heating itself may 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, or "free convection". In the latter case, the problem of heat transport (and related transport of other substances in the fluid due to it) is generally more complicated. Both forcedand natural types of heat convection may occur together (in that case being termed mixed convection).

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