What happens to the flow rate at the nozzle when the fuel temperature decreases?

When the temperature of the fuel decreases, the viscosity of the fuel typically increases, meaning the fuel becomes thicker and flows more slowly. As the viscosity rises, it results in a reduced flow rate at the nozzle because it takes more energy to push the thicker liquid through the system. Therefore, the flow rate does not increase with a decrease in temperature.

It's essential to understand that under normal conditions, the flow rate is influenced by factors such as temperature, pressure, and the physical properties of the fuel. When temperatures drop, the behavior of the fuel changes in a way that impedes its ability to flow freely, which corresponds to a decrease in flow rate at the nozzle. Hence, the adjustments that occur in fluid dynamics due to temperature changes must be taken into consideration for accurate predictions of flow behavior, particularly in heating oil systems.