What impact does increased fuel temperature have on the flow rate through the nozzle?

Increased fuel temperature has a significant impact on the flow rate through the nozzle, primarily due to the effects of viscosity and density. As the temperature of the fuel rises, its viscosity typically decreases, making the fuel less viscous and allowing it to flow more freely. This reduction in viscosity means that the fuel can move more quickly through the nozzle, resulting in an increased flow rate.

Additionally, as fuel temperature increases, its density often decreases, which further contributes to improved flow characteristics. Lower density fuels are less resistant to flow, thus facilitating a higher volume of fuel passing through the nozzle within a given period.

Therefore, the correct response highlights that with elevated fuel temperatures, the flow rate tends to increase due to these physical changes in the fuel properties. Understanding the correlation between temperature and fuel dynamics is crucial for optimizing combustion efficiency and ensuring the effective performance of heating systems.