# Reynolds number

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## Rey·nolds num·ber

(ren'ŏldz),
a dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa.
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## Reynolds,

Osborne, English physicist, 1842-1912.
Reynolds number - a dimensionless number that describes the tendency for a flowing fluid, such as blood, to change from laminar flow to turbulent flow or vice versa.
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Apart from the noted definition for the Reynolds number, an alternative reduced Reynolds number is also typically defined for considering the effect of the shaft diameter properly in bearing analyses .
Figures 11(a) and 11(b) display the relations of the TEF with the Reynolds number at various flow attack angles of the V-Downstream and V-Upstream wavy surfaces in the heat exchanger tube, respectively.
The airfoil is DAE51, and the Reynolds number and angle of attack are [10.sup.5] and 0[degrees], respectively (chord length 0.2 m).
It is hard to observe the recirculation zones when the Reynolds number is small, such as Re = 20, as shown in Figure 3(a).
At Reynolds number of 500, solutions produced with t = 0.5, [DELTA]t = 0.001, N = 30 x 30 are depicted in Figures 5 and 6.
Diameter = 2 mm, Reynolds number = 500, and sheet position = 3 mm.
Nu/[Nu.sub.0] increases when increasing the Reynolds number. For V-Downstream, 15[degrees] [less than or equal to] [alpha] [less than or equal to] 35[degrees], the heat transfer rate tends to increase when augmenting the flow attack angle.
3) At Reynolds number 1190, the dye trace shows the start of transition to turbulent flow but there remains a sheath of laminar flow around the turbulent center.
 investigated the effect of aiding/opposing buoyancy on the turbulent flow field and heat transfer across a square cylinder in vertical channel, the level of wall confinement is similar to  with a constant Reynolds number (5000), under various Richardson number from -1 to 1.
3-The velocity distribution and Nusselt number increased with increasing in Reynolds number values and vice versa for the skin friction.
This kind of industrial applications is challenging for computational fluid dynamics (CFD) as coolant flow properties give rise to a wide range of molecular Prandtl numbers, at the same time being associated with relatively low Reynolds numbers. Reynolds-averaged Navier-Stokes (RANS) computations of heat transfer involving wall bounded flows at elevated Prandtl numbers suffer from a lack of accuracy and/or increased mesh dependency.
Later on, it has been observed during the analysis that the first dimensionless number [[PI].sub.1] is the Reynolds number measured during flutter and then called flutter Reynolds number.

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