The transfer of energy from one atom to another through physical contact is generally termed as conduction. Conduction power supplies remove the need to depend upon fans for cooling.
These devices utilise external metal structures, which act as a large heat sink surface for dissipation of internal energy. In some conduction power supplies, liquid cooled plates are made up of serpentine channels through which liquid circulates for removing the unwanted heat. The conduction process is generally classified into three categories: Ionic Conduction, Electric Conduction and Heat Conduction.
Click here to read more about the three different categories