About Conduction, Convection & Radiation

Heat is removed from the motor primarily by conduction into the water. What happens after that depends on your arrangement for cooling the heated water.

Conduction in the wall between coils and water flow through insulation and any resin filling or even thin air layers where no convection can develop.

Convection between wall and water flow.

Convection between water and exchanger wall.

Conduction within the exchanger wall.

Convection between exchanger wall and air.

first conduction by water, the water will most likely go to a radiator where the heat is dissipated by both convection and radiation.

The majority of heat dissipation occurs through conduction and convection

Through conduction between the heated surface and the boundry layer of the water and then convection between water molecules and some of the heat is transferred through convection to the boundry layer and subsequent conduction between boundry layer and water jacket from where it is dissipated to the atmosphere through convention and radiation