Coolant Flow Calculator

Adjust the operating conditions to explore how coolant temperature, glycol concentration, pipe diameter, and flow rate affect the velocity profile, fluid properties, and flow regime. Supports both ethylene glycol (EG) and propylene glycol (PG) mixtures.

Operating Conditions
Coolant Temp25 °C
Glycol Mix50 %
Hose ID19 mm
Flow Rate10 LPM
Fluid Properties
Viscosity (μ)3.322 mPa·s
Density (ρ)1071.1 kg/m³
Sp. Heat (cₚ)3300 J/kg·K
Conductivity (k)0.3840 W/m·K
Prandtl (Pr)28.5
Freeze Point-37.1 °C
Flow Results
Reynolds (Re)3601
RegimeTransition
V_avg0.588 m/s
V_max0.879 m/s
V_max / V_avg1.496
Friction (f)0.04192
ΔP/m0.41 kPa/m
Nusselt (Nu)44.9
h907.2 W/m²·K
Pipe Flow — Side View
Velocity Profile — Cross Section
V_avg0.01.02.03.04.04.9Velocity (m/s)-9.5-6.3-3.20.03.26.39.5Radial Position (mm)wallwall
Viscosity vs Temperature — EG Concentration
0.5125102050❄10% EG30% EG50% EGCurrentFreeze-20°0°20°40°60°80°100°Temperature (°C)Viscosity (mPa·s)
Model notes: Fluid properties from CoolProp polynomial fits (Melinder 2010, ASHRAE 2001). Friction factor: Churchill (1977), spanning laminar through turbulent in a single equation. Laminar profile: Hagen-Poiseuille. Turbulent profile: power-law (n from Nikuradse/Churchill). Heat transfer: Gnielinski (1976) for Re ≥ 2300, analytical Nu for laminar. Transition zone (2300 < Re < 4000): blended velocity profile.