Reynolds
TOOLS
Cooling System Sizing Tool
Size coolant flow and channel geometry with Reynolds, Nusselt, and pressure-drop outputs.
How this works
Q = m_dot * c_p * Delta T, Re = rho * v * D_h / mu, h = Nu * k / D_h
Methodology
Uses internal flow correlations: Re = ρ × v × D_h / μ, Nu from Gnielinski correlation for turbulent flow. Heat transfer: Q = h × A × ΔT_lm. Pressure drop from Darcy-Weisbach with Moody friction factor.
Calculator Inputs
Coolant Properties
C
C
Channel Geometry
mm
mm
mm
Heat Source
W
LPM
Flow Regime
laminar
Nusselt
3.66
Heat Transfer (h)
488 W/m²K
Required Flow
15.31 LPM
Pressure Drop
8202 Pa
Insufficient flow - 8.0 LPM is below required 15.3 LPM
Heat Transfer & Pressure Drop vs Flow Rate
Heat Flux Pressure Drop Your flow rate Required flow
Flow Regime Zones
Re < 2300: Laminar | 2300-4000: Transition | Re > 4000: Turbulent