For laminar flow, the hydrodynamic and thermal entry lengths are given as DLhRe05.0= and, and for turbulent flow, DLtPrRe05.0=DLLth10. Noting that Pr 1 for liquid metals, the thermal entrance length in laminar flow is shorter than the hydrodynamic entry length. The hydrodynamic and thermal entry lengths in turbulent flow are independent of Re or Pr numbers and have comparable magnitudes.
What is laminar flow?
Laminar flow is defined in fluid dynamics as fluid particles following smooth courses in layers, with each layer passing smoothly through the adjacent layers with little or no mixing. The fluid tends to flow without lateral mixing at low velocities, and neighbouring layers slide past one another like playing cards. There are no crosscurrents perpendicular to the flow direction, nor are there any eddies or swirls of fluid.
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