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Toggle the table of contents. ... The Prandtl number (Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, ...
The simplest model for Pr t is the Reynolds analogy, which yields a turbulent Prandtl number of 1. From experimental data, Pr t has an average value of 0.85, but ranges from 0.7 to 0.9 depending on the Prandtl number of the fluid in question.
The value for the Pr 3+ /Pr couple is −2.35 V. [25] However, in highly basic aqueous media, Pr 4+ ions can be generated by oxidation with ozone. [ 26 ] Although praseodymium(V) in the bulk state is unknown, the existence of praseodymium in its +5 oxidation state (with the stable electron configuration of the preceding noble gas xenon ) under ...
Periodic tables usually at least show the elements' symbols; many also provide supplementary information about the elements, either via colour-coding or as data in the cells. The above table shows the names and atomic numbers of the elements, and also their blocks, natural occurrences and standard atomic weights. For the short-lived elements ...
In fluid mechanics, the Rayleigh number (Ra, after Lord Rayleigh [1]) for a fluid is a dimensionless number associated with buoyancy-driven flow, also known as free (or natural) convection. [ 2 ] [ 3 ] [ 4 ] It characterises the fluid's flow regime: [ 5 ] a value in a certain lower range denotes laminar flow ; a value in a higher range ...
Re m is the magnetic Reynolds number; Re is the Reynolds number; ν is the momentum diffusivity (kinematic viscosity) η is the magnetic diffusivity; At the base of the Sun's convection zone the Magnetic Prandtl number is approximately 10 −2, [2] and in the interiors of planets and in liquid-metal laboratory dynamos is approximately 10 −5.
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Pr 1208 K W: 60 Nd 1297 K W: 61 Pm 1315 K W: 62 Sm 1345 K W: 63 ... The following is a list of structure types which appear in the tables above. Regarding the number ...