Question

In the case of water cooling, there no boundary layer of the liquid coolant on the outside of the cylinder wall.

(a) True

(b) False

The question was posed to me during an online exam.

My query is from Engine Heat Transfer topic in chapter Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(b) False

In the case of water cooling, there is a boundary layer of the liquid coolant on the outside of the cylinder wall. This boundary layer forms as the coolant flows along the surface of the cylinder, and it can affect the heat transfer efficiency. The boundary layer may reduce the rate of heat transfer from the engine surface to the coolant, similar to how a boundary layer in air cooling can impede heat dissipation. However, in water cooling systems, the use of pumps and circulation helps to minimize the impact of this boundary layer.