What method allows for the natural circulation of oil through radiators?

The method that allows for the natural circulation of oil through radiators is natural circulation. This process relies on the principle of buoyancy, where warmer oil, having a lower density, rises while cooler oil, being denser, sinks. This creates a continuous flow of oil through the radiator system without the need for additional mechanical pumps. As the oil is heated, it circulates naturally due to this temperature differential, ensuring effective heat transfer and cooling without requiring external energy sources or mechanical intervention. This method is efficient and beneficial in many applications where simplicity and reliability are paramount.

Other methods like forced cooling and active cooling systems involve mechanical means to circulate the fluid, while pressure circulation typically relies on maintaining specific pressure levels to move fluids through a system. In contrast, natural circulation operates solely on thermal dynamics, making it a fundamental and straightforward approach for radiator systems.