The kinematic viscosity (ν) can be rendered dimensionless if divided by the thermal diffusivity, α = k / (ρ·cp), where k stands for thermal conductivity, ρ stands for density, and cp for the (isobaric) specific heat capacity. The ratio is called the Prandtl number (Pr = ν / α). The logarithm of the Prandtl number can be expected to correlate particularly well with the reciprocal of the reduced temperature (Tr = T/Tc), where Tc stands for the critical temperature.

Thermal diffusivity = (thermal conductivity x kinematic viscosity) / (dynamic viscosity x specific heat)

Unit of thermal diffusivity is m2/s

Unit of thermal conductivity is W/m/K

Unit of kinematic viscosity is m2/s

Unit of dynamic viscosity is Ns/m2

Unit of specific heat is J/kg K

Prandtl number is defined as Cp m/k. m=viscocity and k thermal conductivity. You can find the correlation between logarithemic of Prandtl number and 1/Tr (Tr = T/Tc). Prandtl as a function of temperature will fix the problem.

Thanks for your help: I have understood the relationship between "Cp x Dyn. Viscosity" and Prandtl number using Tc.

Now i am at 2nd step and looking for heat load of a electrical heater using Cp. I have Tinlet and Toutlet values, and have massflow.

Do you have any verified and accurate formula for heat load of a HydroCarbon product, to find kW value? (The heat load could be the function of viscosity as well as T & Cp.)

Hello

Is it possible that tell me the amount of heat capacity for Nafion polymer?

Liquid Heat Capacity can be calculated using Rowlison and Bondi correlation and Ideal Vapor heat Capacity can be calculated by using Lee-Kesler correlation when constant for polynomial equations are not available