# absolute viscosity

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## absolute viscosity

[′ab·sə‚lüt vis′käs·ə·dē]
(fluid mechanics)
The tangential force per unit area of two parallel planes at unit distance apart when the space between them is filled with a fluid and one plane moves with unit velocity in its own plane relative to the other. Also known as coefficient of viscosity.
References in periodicals archive ?
CFPP ([degrees]C) = 3.1417 x LCSF - 16.477 Oil LCSF ([degrees]C) CFPP ([degrees]C) HVO 1.881 -10.567 CVO 3.173 -9.503 TVO 3.378 -5.864 CSVO 2.219 -9.506 Table 8: The Heat of Combustion (KJ/kg) and the Absolute viscosity Inn Heat of Combustion = 47, 465--[4.187(IV) + 38.31(SV)] KJ/kg Viscosity ln = - 4.7965 + 2525.92962(1/T) + 1.6144 [(SV)2/[T.sup.2]] - 101.06 x [10.sup.-7] [(IV).sup.2] Oil H (KJ/kg) ln HVO 39539.54 96.01 CVO 39197.15 94.76 TVO 39759.41 93.96 CSVO 39964.85 91.99 Where IV = Iodine value SV = Saponification value Table 9: Heating values for neat oils (KJ/kg) and (MJ/kg) Oil HHV (KJ/kg) HHV (MJ/kg) LHV (KJ/kg) LHV (MJ/kg) TVO 39620 39.6 36718 36.7 HVO 40724 40.7 39387 39.4 CSVO 39843 39.8 38147 38.1 CVO 41778 41.8 38672 38.7
where, '[eta],' 'A,' 'Q,' and 'RT' are the absolute viscosity, a pre-exponential factor related to activation entropy, apparent activation energy of flow, and thermal energy respectively.
Figure 9a compares the complex viscosity (from dynamic parallel-plate experiments) with the absolute viscosity determined using the sliding plate rheometer for representative polymers of Series 1 (various polydispersities).
In that sense, viscosity is a parameter that gives us correct bubble rise velocity at the given solvent concentration, rather than an absolute viscosity. We could call such a viscosity, pseudo viscosity deduced from assuming Stoke's law.

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