Radiator of an automobile engine is a __________ type of heat exchanger.

Solution (By Examveda Team)

A: Co-current:
In a co-current heat exchanger, both fluids move in the same direction. While this can be efficient in some cases, it typically results in a lower overall temperature difference between the fluids, reducing the effectiveness of heat transfer as they approach similar temperatures. This is not how automotive radiators are designed to operate.

B: Cross-current:
In a cross-current heat exchanger, the fluids flow perpendicular to each other. While this design can be used in some applications, it is not as efficient as counter-current systems for maximizing heat exchange. Automotive radiators do not employ this design.

C: Counter-current:
This is the correct answer. In a counter-current heat exchanger, one fluid flows in one direction while the other flows in the opposite direction. In a radiator, the hot coolant from the engine flows through the radiator while the cooler air flows in the opposite direction. This arrangement maintains a high temperature gradient, allowing for more effective heat transfer and cooling of the coolant.

D: Direct contact:
In direct contact heat exchangers, the two fluids mix directly, allowing for heat transfer through physical contact. While effective in some systems, it is not applicable for radiators where the coolant and air should remain separate to prevent contamination and maintain fluid integrity.

Conclusion:
Based on the explanation, the radiator of an automobile engine operates as a C: Counter-current type of heat exchanger, which is the most efficient design for transferring heat in this application.