Download E-books Understanding MEMS: Principles and Applications PDF

The persisted development of MEMS (micro-electro-mechanical structures) complexity, functionality, advertisement exploitation and marketplace dimension calls for an ever-expanding graduate inhabitants with state of the art expertise.

Understanding MEMS: ideas and purposes provides a accomplished advent to this complicated and multidisciplinary expertise that's available to senior undergraduate and graduate scholars from a number engineering and actual sciences backgrounds.

Fully self-contained, this textbook is designed to assist scholars grab the most important ideas and operation of MEMS units and to encourage complex examine or a profession during this field.

Moreover, with the expanding software components, product different types and performance of MEMS, pros also will reap the benefits of this consolidated assessment, resource of appropriate equations and huge ideas to problems.

Key features:

  • Details the basics of MEMS, permitting readers to appreciate the fundamental governing equations and know the way they observe on the micron scale.
  • Strong pedagogical emphasis allowing scholars to appreciate the basics of MEMS devices.
  • Self-contained research relief that includes difficulties and solutions.
  • Book significant other web site hosts Matlab and PSpice codes and viewgraphs.

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Young’s modulus is E = 169 GPa. The resonant frequency in the absence of acceleration is f(0) = 81. 978 kHz. Notes 1Q is used here to dessignate the quality factor, not to be confused with the elcetrical charge Q used in previous chapters 7 Microfluidics and Electrokinetics There are many phenomena in microscopic dimensions related to fluids where the viscous forces dominate, making the hydrodynamic pressure inefficient for moving fluids. There are a number of electrokinetic forces: the electrothermal force acting on the volume of the fluid due to temperature gradients; the electro-osmotic force acting near the boundary surfaces; the electrowetting force acting on the triple line (fluid–solid–gas interface); the electrophoretic and dielectrophoretic forces acting on embedded particles in a fluid. In this chapter we describe the basics of the fluid transport by pressure difference and by the electrokinetic force that can be applied due to the electrical double layer for ionic liquids. We concentrate also on the electrowetting principle that is gaining momentum in applications such as displays and lab-on-chip devices. We conclude with a description of the dielectrophoretic force that is used to drive and sort nanoparticles. 7. 1 Viscous Flow Let us consider a differential volume in a pipe of rectangular cross-section as shown in Figure 7. 1. The change with respect to time of the mass inside the volume can be written as [43] (7. 1) If we suppose that the fluid has a velocity u in the direction of the x-axis, the volume entering at x per unit time is (7. 2) where ρm is the fluid mass density. 1 Extending to the z-axis, (7. three) we now introduce the flow in the x-direction by unit transversal length, (7. four) The rate of change of mass inside the volume is equal to the difference between the volume entering at x and the volume leaving at x + dx, (7. five) Extending to two dimensions, (7. 6) leading to (7. 7) Figure 7. 1 Differential of volume in a pipe We set the equilibrium conditions in the volume by considering the pressure, P(x) and P(x + dx), at the two horizontal ends and the shear forces at the bottom and top surfaces, τzx(z) and τzx(z + dz), (7. eight) We can write (7. nine) The shear force τzx can be substituted by its definition as a function of the viscosity, μ, and the fluid velocity in the slice uz, (7. 10) Viscosity can be interpreted in terms of the shear forces between different layers of a fluid moving at different speeds. τzx is acting along the x-axis on a surface whose normal is along the z-axis. Equation (7. 10) indicates that the shear forces are proportional to the gradient of the fluid velocity in the transversal direction. Substituting equation (7. 10) into equation (7. 8), (7. eleven) One particular case is when the pressure gradient is not a function of z, and this is called Poiseuille flow. Integrating equation (7. 11) twice and applying boundary conditions of zero velocity at the pipe walls, u(0) = 0 and u(h) = 0, the fluid velocity is found to be (7. 12) This result indicates that the velocity profile in the the z-direction is quadratic in z and the maximum velocity occurs when (7.

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