Question

____________ is the transfer of heat within a fluid by mixing of one portion of fluid with another.

(a) Convection

(b) Conduction

(c) Radiation

(d) None of the mentioned

I had been asked this question in an interview for job.

The doubt is from Engine Heat Transfer in division Heat Rejection and Cooling of IC Engine

Answer 1

The correct answer is:

(a) Convection

Convection is the transfer of heat within a fluid (liquid or gas) through the movement and mixing of the fluid's particles. When a portion of the fluid becomes heated, it becomes less dense and rises, while cooler portions of the fluid move in to replace it, creating a circulating flow. This process efficiently transfers heat throughout the fluid. In engine cooling, convection is crucial for transferring heat from the engine to the coolant.