Heat transfer that involves actual movement or circulation of a substance is known as

convection heat transfer.

Explanation:

Convection heat transfer -

It is the transfer of the heat from one place to the other via the fluid movement.

It is one of the dominant method of heat transfer in the gases and liquids.

The process of heat transfer involves, the actual circulation or movement of the substance.

hence, from the given statement the answer is convection heat transfer.