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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, turbulent flow.
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A larger Nusselt number corresponds to more active convection, with turbulent flow typically in the 100–1000 range. A similar non-dimensional property is the Biot number, which concerns thermal conductivity for a solid body rather than a fluid. The mass transfer analogue of the Nusselt number is the Sherwood number.
The ratio of the Grashof number to the square of the Reynolds number may be used to determine if forced or free convection may be neglected for a system, or if there's a combination of the two. This characteristic ratio is known as the Richardson number (Ri). If the ratio is much less than one, then free convection may be ignored.
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Overview. The country calling code of Serbia is +381. Serbia and Montenegro received the code of +381 following the breakup of the Socialist Federal Republic of Yugoslavia in 1992 (which had +38 as country code). Montenegro switched to +382 after its independence in 2006, so +381 is now used only by Serbia. [2]
Passed the Senate on December 9, 2006 (unanimous consent) Signed into law by President George W. Bush on December 20, 2006. The Postal Accountability and Enhancement Act (PAEA) is a United States federal statute enacted by the 109th United States Congress and signed into law by President George W. Bush on December 20, 2006. [1]