{\displaystyle r} As such, the model is designed for spherically symmetric molecules. A . dans un volume de 1 m3. 2 100 5 0 obj Masse volumique : Rapport de la masse d'eau (kg) occupé dans un volume de 1 m3. Written by Kupis on June 19, 2020 in Chart. is the kinematic viscosity in centistokes, [5] It is completely determined by the kinetic theory, being expressed in terms of integrals over collisional trajectories of pairs of molecules. ′ Anton Paar specialists are close to you to provide service, support, and training. {\displaystyle \nu } {\displaystyle \mu } In particular, given a model for intermolecular interactions, one can calculate with high precision the viscosity of monoatomic and other simple gases (for more complex gases, such as those composed of polar molecules, additional assumptions must be introduced which reduce the accuracy of the theory).[1]. It accurately describes many liquids over a range of temperatures. {\displaystyle \Omega } If one models gas molecules as elastic hard spheres (with mass M��B ���d���fOYI��#3� �GWYaVnʂm%�W/_��3�" ^](�Xur�����y�1U���� ]g*�&�-���[^�}�d����L/ s endobj 0000008396 00000 n [15], The Walther formula is typically written in the form. Mécanique des fluides ... C’est la pression de vapeur maximale que l’air peut supporter à une température donnée. [3] This is not a realistic model for real-world gases (except possibly at high temperature), but provides a simple illustration of how changing intermolecular interactions affects the predicted temperature dependence of viscosity. {\displaystyle A} ��'�� �����iלi�t*��9j� �L�|��y�hz��X����,�YK֘�9)�iv������oNϛe\(��V~�d�l�K4�U�Og)%&P0A�SGH-�M�����u�M���H�d�8��2+�>Qؕ"?/�|4��.A#(�ud�H�J��-�($���ق��/����Y�� �V�Bi�v����:B��~�&ᗁz�iIA��~�������5�_.�� ), then elementary kinetic theory predicts that viscosity increases with the square root of absolute temperature ∗ s Viscosity Of Gear Oil Table And Chart. Hence, gaseous viscosity increases with temperature. ;yn䴜�x������#���L/ ���Á��k��k����1���JsRϟ:���5599�x�]m�U�jqV����k�R������>��� ��p8���r��u�K��fE���ɇwU\ojp��=L4\:���d��Ei���H�ݔ�q�Ա����M� xS �B��C ����[�,.=>&g���Kէ�z��� �`0���YUy�${yv�܌���{6��65L��� �6�6_=�kK����e. 2 0 obj where <>/ExtGState<>/Font<>/ProcSet[/PDF/Text/ImageB/ImageC/ImageI] >>/MediaBox[ 0 0 594.96 842.04] /Contents 4 0 R/Group<>/Tabs/S/StructParents 0>> {\displaystyle s} The main requirements for an engine oil are defined temperature-viscosity properties, protection against wear and corrosion, keeping the engine clean, holding particles like soot or abrasives in suspension, yield strength under compression and many more. shown in the table. Nevertheless, it can be calculated numerically, and the agreement with experiment is good – not only for spherically symmetric molecules such as the noble gases, but also for many polyatomic gases as well. <> v / s) Gallium: Ga 400 1.158 500 0.915 600 0.783 700 0.700 800 0.643 Zinc: Zn 700 3.737 800 2.883 900 2.356 1000 2.005 1100 1.756 Cadmium: Cd 600 2.708 700 0000478610 00000 n k The calculator below is for informative purposes only. 0000001357 00000 n 0000000016 00000 n 0000002955 00000 n {\displaystyle T^{1/2}} {\displaystyle \nu } endstream
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