MECHENG 320 Lecture Notes - Lecture 5: Molecular Dynamics, The Fluid, Resultant Force

• School: U of M
• Department: Mechanical Engineering
• Course: MECHENG 320
• Professor: Xiaogan Liang

Document Summary

Definition : fluid is a material that deforms continuously and permanently under applied shear forces no matter how small . Almost impossible to keep track of molecule every. Molecular dynamics ssumc a fluid consisting of continuous matter lie . neglect molecular structures ) Definition : a small volume over which the property of a fluid is essentially constant n l. L : size free path of gases :d ~ 10-9 m. Liquids : d ~ 10 of a fluid particle fluid molecules ( 1nm) m ( i at in: m du. Quantitative description in terms of primary quantities e. g. length l time t mass m. Fluid properties : viscosity , lnviscidl viscous how regimes , laminar. Bulk modulus : er dg1= . d =( dp. D be specific volume i. e. volume mass. Mac 0. 3 incompressible ( i. e. p= constant ) speed of sound. Layers of fluids are being sheared relative to one another.