1.An expression of Newton's second law that relates forces, displacements, and their derivatives for a mechanical system. 2.For the respiratory system, an equation that relates the forces involved in breathing to the displacements they produce. Typically, pressure differences are used to represent ...
At the left edge, the density is relatively low and the velocity is relatively low, causing a small inflow of fluid. The x-derivative of ρvx is positive. This is the crucial contribution to ∇ * (ρv); the other two contributions vanish in this example. We have a net outflow of ...
百度试题 结果1 题目 In the momentum equation, for steady flow the net force on the fluid mass is equal to the net rate of outflow of momentum across the control surface. ()A.对B.错 相关知识点: 试题来源: 解析 A 反馈 收藏 ...
In the second step, a wall is mounted to obstruct the flow and the normal force experienced by the wall is measured. Then a set of equations based on depth-averaged momentum conservation, making it possible to derive the time-varying force on the wall, is described. The model was proposed...
0-D, 1-D, 2-D, and 3-D models are available for single- and two-phase flow that use either time averaging or combined space-time averaging. Each approach uses a set of balance equations for mass, momentum, and energy, and the derivation of these equations may need complex mathematical...
aThe conservation of momentum in an inertial (non-accelerating) reference frame may be described by equation (10). In this equation, P is the static pressure, s is the stress tensor (described by equation (11)), and and . are the gravitational body force and external body forces, ...
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The Navier–Stokes equations provide the simplest model for the motion of a viscous incompressible fluid that is consistent with the principles of mass and momentum conservation, and with Stokes’ hypothesis that the internal forces due to viscosity must be invariant with respect to any superimposed ...
The first is to divide the work done by the time it took. The second is to multiply the force by the velocity. What is the formula for power in watts? The formula for power in watts is given by the work and the time. The formula is P = W/t, where W is the work done in ...
Here V is a nonrelativistic NN force, like the lowest order one-π or one-ρ exchange potentials, jSN0(0) is the single nucleon density operator taken at the space–time point 0, j⇒exch(0) the related exchange current operator, and P⇒ the total two-nucleon momentum operator. Neglec...