油液粘度温度特性计算工具

Input the temperature and viscosities of the product against T lower and T upper

Input the temperature at which you wish to know the viscosity, and read off the result

Limitations - This program cannot be used to predict viscosities at low temperatures as it

does not consider the effects of pour point or viscosity index improvers.

CALCULATION OF KINEMATIC VISCOSITY AT ANY TEMPERATURE

Shell Tellus Arctic 32

f(V)ln(T abs)

-------------T lower:40.00KV @ Tl:32.00 1.25002451 5.74620319 ************

T higher:100.00KV @ Th: 6.000.65072109 5.92157842 ************----------------

l-h:0.59930342-0.1753752 T wanted:-20.00 5.53338949

******

m:-3.4172638

c:20.8863166

f(V @ Tw): 1.97726507 Kinematic Visc at Celcius =1369.742103cSt

===============================================

NOTE - Formulae for the calculation of viscosity at Tw

Visc(Tw) = exp(exp("m" x ln(Tw+273) + "c"))

"m" = lnln( V(l)+0.8 ) - lnln( V(h)+0.8 ) / ln(Tl+273)-ln(Th-273)

"c" = lnln( V(l)+.8 ) - "m" x ln(Tl + 273)

where Th = Higher temp Tl = Lower temp V(l) = Visc at Tl

The calculation of the viscosity at different temperatures is done

using the "Refutas" log-log graph algorithm assuming a straight line

relationship between viscosity and temperature as shown below:

f(V) = "m" x ln(T+273) + "c" where f(V) = lnln(V+0.8)