![]() So then looked at simply adding SAE30, and SAE40 in a 1:4 ratio.look at what that does to the BOV, as it's heavier than any of them as it stands.SAE30 is 20% thicker than the calculated for the 10W60 BOV. 0W, mixing say a 0W20 with a 0W40 puts the BOV AND the VM treat rate about and approximately into the 0W30 grade).near enough for Government work anyway. * that the simple ratio of final KV100 on calculated BOV for a given VM treat rate drops, as it should with the increasing shear stresses in the thicker base-stock. * There's more (obviously) VM additive to get the higher high temperature grade with the lower BOV (shows in NOACK in the original table) * the Base Oil (BOV) viscosity, particularly with the 0Ws drops with increasing high temperature grade. Today while messing around with headlight bulbs and cabin air filters, I was pondering what mixing a monograde with a multigrade netted.whether the blending calculators made sense in those worlds, when you aren't averaging basestock viscosity and VII concentration in the traditional multigrade format, but are instead diluting with an entirely, and much thicker basestock. Yep, the calculators are based on well known rules/laws for blending basestocks, but my query has always been how well they do with already formulated oils that AREN'T just simple basestocks.Ī few minutes of messing should get you across the line that viscosity Modifiers, due to their nature have a lower impact in terms of viscosity modification in heavier basestocks, as the intrinsic shear stresses are higher in a higher viscosity basestock.Īnd typically (and especially so the 0W grade) the higher the high temperature grade, the lower the base oil viscosity, and the more VII. Not a recipe book, but some of the best information that we've gotĪnd we "know" that the blending calculators tell you what you want to know regarding a mix, but as I've repeatedly warned, the beaviours need to be linear in response, and additive to give you the same number as a calculator. doi.You've all seen this one before that was lifeted from a Mobil blending guide.again, The viscosity of nonpolar gases at normal pressures. ![]() Calculation of the viscosity of technical gas mixtures from the viscosity of the individual gases. ![]() The viscosity of pure substances in the dense gaseous and liquid phases. Phase behavior of petroleum reservoir fluids. An improved corresponding states model for the prediction of oil and gas viscosities and thermal conductivities. Journal of Petroleum Technology, 18:paper SPE–1340–PA, 1966. Calculate \(T_c\) and \(p_c\) from equation \eqref and \(c_1\) to \(c_6\) are constants.Ī.Given below and is adapted from "Phase Behavior of Petroleum Reservoir Fluids" 3. The procedure of the corresponding states principle (CSP) for viscosity modeling as described bt Pedersen in 1982 2 is This might give inconsistent results between your PVT model in Tuning the CSP model that Eclipse does not have. Note from Markus Hays Nielsen: Be cautious if you are moving your EOS model from PVTp to Eclipse, as PVTp has an option for Corresponding States Principle Correlation
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