In
fluid dynamics, the reyn is a British unit of
dynamic viscosity,
named in honour of
Osbourne Reynolds
Osborne Reynolds (23 August 1842 – 21 February 1912) was an Irish-born innovator in the understanding of fluid dynamics. Separately, his studies of heat transfer between solids and fluids brought improvements in boiler and condenser design. ...
, for whom the
Reynolds number is also named.
[Juvinal, Robert C. & Marshek, Kurt M.; ''Fundamentals of machine component design''. 2nd ed., 1991, pp. 480, ]
Conversions
By definition,
:1 reyn = 1 lb
f s in
−2.
It follows that the relation between the reyn and the
poise is approximately
:1 reyn = 6.89476 × 10
4 P.
In
SI units, viscosity is expressed in newton-seconds per square meter, or equivalently in
pascal-seconds. The conversion factor between the two is approximately
:1 reyn = 6890 Pa s.
References
External links
ReynHistory of the unit
Fluid dynamics
Units of dynamic viscosity
{{Fluiddynamics-stub