弾性流体潤滑膜のせん断挙動に及ぼす温度上昇の影響

概要

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An experimental study has been made of the effect of temperature rise on rheololgical properties of some mineral and synthetic hydrocarbon base oils over a wide range of temperature. The representative stress τ_0 expressing the limit of Newtonian is determined by a curve fitting method from a traction curve obtained on a four-roller machine while the effective viscosity-pressure coefficient α^- is derived through the experiments using a high pressure viscometer. When the temperature is raised, α^- falls and τ_0 rises. The behaviour of τ_0 for paraffinic mineral oil and α-olefine oligomer follows the Eyring theory while the effect of the dissociation of molecular clusters appears with naphthenic oils. The increase in temperature causes a reduction in the maximum traction coefficient, which can be predicted by the theory using the rheological parameters expressed as a function of temperature with the error of 10 % at most.
社団法人日本機械学会の論文
1990-08-25