Calculates Nusselt number for fully developed turbulent pipe flow using the Dittus-Boelter equation: Nu = 0.023 Re^0.8 Pr^0.4 (heating) or 0.3 (cooling). Dittus-Boelter is valid for Re > 10,000, 0.7 < Pr < 160, and L/D > 10 — Gnielinski's correlation (1976) is more accurate for lower Re.
Reference formula or conversion factor shown for context.
Mu Ratio
Fluid resistance to flow. Water at 20°C: ~1 cP. Honey: 2,000–10,000 cP. Higher viscosity increases pumping power requirements.
Results
Nusselt number Nu (Dittus-Boelter)
Sample size or count used in the calculation.
Nu (Gnielinski)
Sample size or count used in the calculation.
Nu (Sieder-Tate)
The value at the specified point or condition.
Fanning friction factor f
A dimensionless multiplier applied in the calculation.
Nu = 0.023·Re^0.8·Pr^0.4
Sample size or count used in the calculation.
flow regime
Whether the flow is laminar (smooth, ordered) or turbulent (chaotic). Determined by the Reynolds number: below 2,300 = laminar; above 4,000 = turbulent.