Flip your classroom: Reach every student in every class every day

Machinery health prognostics: A systematic review from data acquisition to RUL prediction

Arthur Chickering is Distinguished Professor of Higher Education at Memphis State University. On leave from the Directorship of the Center for the Study of Higher Education at Memphis State, he is Visiting Professor at George Mason University. Zelda Gamson is a sociologist who holds appointments at the John W. McCormack Institute of Public Affairs at the University of Massachusetts-Boston and in the Center for the Study of Higher and Postsecondary Education at the University of Michigan.

Seven Principles for Good Practice in Undergraduate Education: Faculty Inventory. Institutional Inventory.

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Principles Of Heat Transfer In Porous Media

Heat and mass transfer in packed beds

Numerical simulation of turbulent flow in the suction chamber of a gearpump using deforming mesh and mesh replacement

The work presented in this article demonstrates the use of an empirical and simplified approach based on an optical technique and a home-made ad hoc code that give knowledge of the shape and fallin...

https://journals.sagepub.com/doi/pdf/10.1177/1687814016669635

An empirical methodology for prediction of shape and flow rate of a free-falling non-submerged liquid and casting iron stream:

Contact problems of a trochoidal-gear pump

Misalignment effects on the load capacity of a hydraulic cylinder

Recently several works have been published on numerical simulation of an external gear pump (EGP). Such kinds of pumps are simple and relatively inexpensive, and are frequently used in fluid power applications, such as fluid power in aeronautical, mechanical, and civil engineering. Nevertheless, considerable effort is being undertaken to improve efficiency and reduce noise and vibration produced by the flow and pressure pulsations. Numerical simulation of an EGP is not straightforward principally for two main reasons. First, the gearing mechanism between gears makes it difficult to handle a dynamic mesh without a considerable deterioration of mesh quality. Second, the dynamic metal-metal contact simulation is important when high pressure outflow has to be reproduced. The numerical studies published so far are based on a two-dimensional (2D) approximation. The aim of the present work is to contribute to the understanding of the fluid flow inside an EGP by means of a complete three-dimensional (3D) parallel simulation on a cluster. The 3D flow is simulated in a LINUX cluster with a solver developed with the OPENFOAM Toolbox. The hexahedral mesh quality is maintained by periodically replacing the mesh and interpolating the physical magnitudes fields. The meshing contact point is simulated with the viscous wall approach, using a viscosity model based on wall proximity. The results for the flow rate ripples show a similar behavior to that obtained with 2D simulations. However, the flow presents important differences inside the suction and the discharge chambers, principally in the regions of the pipes' connection. Moreover, the decompression slot below the gearing zone, which can not be simulated with a 2D approximation, enables a more realistic simulation of a contact ratio greater than 1. The results are compared with experimental measurements recently published.

P. J. Gamez-Montero

Papers

Numerical simulation of turbulent flow in the suction chamber of a gearpump using deforming mesh and mesh replacement

An empirical methodology for prediction of shape and flow rate of a free-falling non-submerged liquid and casting iron stream:

Contact problems of a trochoidal-gear pump

Misalignment effects on the load capacity of a hydraulic cylinder

Three-Dimensional Numerical Simulation of an External Gear Pump With Decompression Slot and Meshing Contact Point