How does feed water temperature primarily affect the permeate flux in an RO system, assuming constant pressure?

Feed water temperature primarily affects the permeate flux in an RO system by changing the viscosity of the water. Permeate flux refers to the rate at which pure water passes through the RO membrane, typically measured in liters per square meter per hour (LMH) or gallons per square foot per day (GFD). As temperature increases, the viscosity of water decreases. Viscosity is a measure of a fluid's resistan....