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The Prandtl number (Pr) or Prandtl group is a dimensionless number, named after the German physicist Ludwig Prandtl, defined as the ratio of momentum diffusivity to thermal diffusivity. [1] The Prandtl number is given as:
There have been three types of PR card in circulation: the 2002, the 2009 and the 2015 version. As all PR card's lifespan cannot exceed five years, the initial 2002 and 2009 versions should be no longer in use. [12] All three versions of the card contain a maple leaf in the front of the card, hence earning the nickname "maple leaf card".
PR PAL Philippine Airlines: PHILIPPINE Philippines PHI Philips Aviation Services: PHILAIR Netherlands ICAO code and call sign no longer allocated BCH Phillips Air: BEACHBALL United States PDD Phillips Alaska: PADA United States PHL Phillips Michigan City Flying Service: PHILLIPS United States PHB Phoebus Apollo Aviation: PHOEBUS South Africa KZM
The Rayleigh number is defined as the product of the Grashof number (Gr), which describes the relationship between buoyancy and viscosity within a fluid, and the Prandtl number (Pr), which describes the relationship between momentum diffusivity and thermal diffusivity: Ra = Gr × Pr.
The NRIC comes in two main colour schemes: pink for Singaporean citizens and blue for permanent residents (PR). Each card is identified by an NRIC number ("Identity Card Number"), which is a unique set of nine alpha-numerics given to each citizen or PR.
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The turbulent Prandtl number (Pr t) is a non-dimensional term defined as the ratio between the momentum eddy diffusivity and the heat transfer eddy diffusivity. It is useful for solving the heat transfer problem of turbulent boundary layer flows.
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