Toward general regime maps for cohesive‐particle flows: Force vs. energy‐based descriptions and relevant dimensionless groups

AIChE Journal ◽  
2021 ◽  
Author(s):  
W. Casey Q. LaMarche ◽  
Peiyuan Liu ◽  
Kevin M. Kellogg ◽  
Aaron M. Lattanzi ◽  
Christine M. Hrenya
Keyword(s):  
Particle Flows ◽  
Dimensionless Groups

Adhesive Particle Flows

2014 ◽  
Author(s):  
Jeffrey S. Marshall ◽  
Shuiqing Li
Keyword(s):  
Particle Flows

Investigation of the Squeeze Film Dynamics Underneath a Microstructure With Large Oscillation Amplitudes and Inertia Effects

2016 ◽  
Vol 138 (3) ◽  
Author(s):  
Nadim A. Diab ◽  
Issam A. Lakkis
Keyword(s):  
Rarefied Gas ◽  
Direct Simulation Monte Carlo ◽  
Squeeze Film ◽  
Dsmc Method ◽  
Inertia Effects ◽  
Flow Parameters ◽  
Fluid Behavior ◽  
Dimensionless Groups ◽  
Simulation Monte Carlo ◽  
The Impact

This paper presents direct simulation Monte Carlo (DSMC) numerical investigation of the dynamic behavior of a gas film in a microbeam. The microbeam undergoes large amplitude harmonic motion between its equilibrium position and the fixed substrate underneath. Unlike previous work in literature, the beam undergoes large displacements throughout the film gap thickness and the behavior of the gas film along with its impact on the moving microstructure (force exerted by gas on the beam's front and back faces) is discussed. Since the gas film thickness is of the order of few microns (i.e., 0.01 < Kn < 1), the rarefied gas exists in the noncontinuum regime and, as such, the DSMC method is used to simulate the fluid behavior. The impact of the squeeze film on the beam is investigated over a range of frequencies and velocity amplitudes, corresponding to ranges of dimensionless flow parameters such as the Reynolds, Strouhal, and Mach numbers on the gas film behavior. Moreover, the behavior of compressibility pressure waves as a function of these dimensionless groups is discussed for different simulation case studies.

Resonant generation of electromagnetic surface wave by inhomogeneous relativistic electron stream

1981 ◽  
Vol 26 (3) ◽  
pp. 509-515 ◽  
Author(s):  
V. M. Čadež ◽  
S. Vuković ◽  
V. V. Frolov ◽  
A. Yu. Kyrie
Keyword(s):  
Surface Wave ◽  
Growth Rates ◽  
Doppler Effect ◽  
Maximal Growth ◽  
Electron Stream ◽  
Particle Flows ◽  
Anomalous Doppler Effect ◽  
Excitation Mechanisms ◽  
Resonant Generation ◽  
Cerenkov Effect

Generation of electromagnetic surface waves by relativistic inhomogeneous particle flows is investigated for plane and cylindrical geometries. The basic excitation mechanisms are shown to be the induced anomalous Doppler effect and the hydrodynamic Čerenkov effect. The relevant maximal growth rates may differ significantly from those derived for monoenergetic beams.

Research on Particle Flow Erosion Precision Electroforming Technology

2013 ◽  
Vol 771 ◽  
pp. 75-81
Author(s):  
Nai Chang Dai ◽  
Sheng Dong Yu
Keyword(s):  
Mechanical Property ◽  
Glass Bead ◽  
Cathode Surface ◽  
Special Functions ◽  
Particle Flow ◽  
Metallic Nickel ◽  
Microscopic Structure ◽  
Huge Amount ◽  
Deposit Surface ◽  
Particle Flows

t is possible to get electroforming deposit with numerous special functions by adoption of traditional electroforming technique, but in which there are defects such as uneven electroforming deposit and unstable performance, etc. In order to enhance the quality and speed of electroforming deposit, this article has proposed the particle flow erosion precision electroforming technology, particle flows such as huge amount of micro glass bead is used in the process of electro-deposit for erosion of electroforming deposit surface, so that micro glass beads continuously abrade and impact cathode surface. As indicated in electroforming test of metallic nickel, in comparison with traditional electroforming technology, particle flow erosion precision electroforming technology can effectively change the microscopic structure of electroforming deposit, refine grain and realize evener distribution of grains, so as to reduce the diffracted intensity of all crystal faces and enhance mechanical property of electroforming deposit.

Asymmetry between deuterium and tritium turbulent particle flows

2021 ◽  
Vol 28 (6) ◽  
pp. 062301
Author(s):  
E. A. Belli ◽  
J. Candy
Keyword(s):  
Particle Flows

Dynamic Behavior of a Hydraulically Actuated Mechanism. Part 2: Nonlinear Character

1986 ◽  
Vol 108 (2) ◽  
pp. 250-254
Author(s):  
V. Venkatraman ◽  
R. W. Mayne
Keyword(s):  
Dynamic Response ◽  
Transient Response ◽  
Adequate Description ◽  
Linear Behavior ◽  
Transmission Angle ◽  
Dimensionless Groups ◽  
Hydraulically Actuated ◽  
Nonlinear Character ◽  
The Common ◽  
Nonlinear Nature

The first of these papers considering a hydraulically actuated mechanism presents the common oscillating cylinder arrangement and sets of equations which describe the dynamic system. It then defines dimensionless groups that characterize the actuator-mechanism and explores the quasi-linear behavior of the system. This present paper focuses on the nonlinear nature of the system. Effects of transmission angle, mechanism geometry and loading are considered as well as the range of operation in which the small perturbation behavior provides an adequate description of the dynamic response. The paper closes by identifying a new parameter which plays an important role in characterizing the dependence of the system transient response on mechanism geometry.

A quadrature-based moment method for dilute fluid-particle flows

2008 ◽  
Vol 227 (4) ◽  
pp. 2514-2539 ◽  
Author(s):  
O. Desjardins ◽  
R.O. Fox ◽  
P. Villedieu
Keyword(s):  
Moment Method ◽  
Fluid Particle ◽  
Particle Flows
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