PDF-Eddy diffusivity

0q i 0 F Ui 1 i1 F 131 t where F f 0 2 g0H F y v 1 0q 1 0 v 2 0q 2 0 132 and H is the diabatic forcing of the interface temperature equation The mean feld approxim. It is used for measuring targets made of electrically conductive materials which may be either ferromagnetic or nonferromagnetic A highfrequency alternating current flows through a coil cast in the sensor housing The electromagnetic coil field induc Thermal diffusivity measurements of seven naturally deformed upper mantle rocks were made as a function of pressure up to 1 GPa temperature up to 1250 K and the deformation fabric of the samples For each sample the straininduced crystal preferred or A high frequency alternating current is fed through a coil embedded in a sensor housing The electromagnetic field from the coil induces eddy currents in the conductive target As a consequence the alternating current resistance of the coil changes Th Thorough understanding of these properties is critical for any process or material which experiences a large or fast temperature gradient or for which the tolerance for temperature change is exacting Accurate values of these properties are essential Analogies. Heat .  Mass  . (sometimes). Momentum. Analogies are useful tools. An aid to understand transfer phenomena. A sound means . t. o predict behavior of systems for which limited quantitative data are available. Eddies and mixing. L. Talley Fall, . 2015. 1. Mesoscale eddies. “Eddy” fluctuations in general (horizontal and vertical). Eddy kinetic energy. Eddies and horizontal mixing. Diapycnal (quasi-vertical) mixing. Moninya Roughan Helen Macdonald, John Wilkin, Mark Baird, Jason Everett. UNSW Coastal and Regional Oceanography Group. www.oceanography.unsw.edu.au. Circulation around Australia. Poleward. flowing currents along east and west coast. fying. . Research: . Understanding Properties of Southern Ocean Eddies. Intern: Bridget Zakrzewski Mentor: Ivy . Frenger. . . How can we combine surface and sub-surface data to observe . : Lecture 11. (ME EN 7960-003). Prof.. Rob Stoll. Department of Mechanical Engineering. University of Utah. Fall 2014. . Evolution of . τ. ij. : . Deardorff. (ASME J. Fluids Eng., 1973). -. Deardorff. Recall: The equation for heat transfer in the turbulent regime. Sieder. -Tate Equation.  .  . (for forced convection/ turbulent, . Re > 10000 & 0.5 < . Pr. < 100). If we divide this by . Scott Bachman. With Baylor Fox-Kemper. NSF OCE 0825614. Outline. Motivation. Math and Extant Parameterizations. The models in the suite. Results: . Eady. Conclusion and Future Tasks. Figure courtesy of Baylor Fox-Kemper. EDDY CURRENTS SEPARATOR. Eddy . currents. are . an. . electrical. . phenomenon. . that. . occurs. . when. a conductor . goes. . through. a variable . magnetic. . field. . . This. . relative. Eddy current inspection is one of several NDT methods that use the principal of “electromagnetism” as the basis for conducting examinations. .. Eddy currents are created through a process called electromagnetic induction. When alternating current is applied to the conductor, such as copper wire, a magnetic field develops in and around the conductor. This magnetic field expands as the alternating current rises to maximum and collapses as the current is reduced to zero. If another electrical conductor is brought into the close proximity to this changing magnetic field, current will be induced in this second conductor. Eddy currents are induced electrical currents that flow in a circular path. They get their name from “eddies” that are formed when a liquid or gas flows in a circular path around obstacles when conditions are right.. .. 2. . Polynomial fits. .. Tumlirz equation . . Eckart’s method (Eckart 1958). Wright’s equation of state (Wright 1996). *nonlinear least square fit to IES80 over the full parameter range. .