A one-dimensional model of the Hall- Effect thruster is presented with results for the SPT-100 engine. This numerical model allows much faster convergence in comparison to other particle methods. The physical models include collisions of electrons…
Papers in Fluid Mechanics/Dynamics
Fluid Mechanics/Dynamics papers in Physics, A
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Previous one-dimensional Hall thruster models predict some observed features correctly, but do not adequately treat the losses of energy and ionization to the side walls of the channel. Because those losses have important effects on the discharge…
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A low power 1Mb Magnetoresistive Random Access Memory (MRAM) based on a 1-Transistor and 1-Magnetic Tunnel Junction (1T1MTJ) bit cell is demonstrated. This is the largest MRAM memory demonstration to date. In this circuit, MTJ elements are…
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Multi-century sea-level records and climate models indicate an acceleration of sea-level rise, but no 20th century acceleration has previously been detected. A reconstruction of global sea level using tide-gauge data from 1950 to 2000 indicates a…
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Much effort over many years has been devoted to the reform of the teaching of physics. This has led to many new and imaginative approaches in the content and delivery of material. Great strides have been made in the delivery, and the content has…
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A 3-D Computational Model Predicts that Cell Deformation Affects Selectin-Mediated Leukocyte RollingLeukocyte recruitment to sites of inflammation is initiated by their tethering and rolling on the activated endothelium under flow. Even though the fast kinetics and high tensile strength of selectin-ligand bonds are primarily responsible for…
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A 3D incompressible thermal lattice Boltzmann model is proposed in this paper to solve 3D incompressible thermal flow problems. Two different particle velocity models of D3Q15 and D3Q19 are incorporated in our thermal model. It is indicated that the…
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This paper is a report of our simulations of different processes occurred in the outlet section domain of Hall thruster (SPT-70). Up to now it is not known completely how electrons move from a cathode compensator into SPT channel. There is no single…
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Presently, the use of Solar Electric Propulsion (SEP) as the principal propulsion and navigation system for interplanetary missions is reaching its maturity level after decades of consideration only on the design boards. NASA's Deep Space 1…
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A new balanced-force algorithm is presented for modeling interfacial flow with surface tension. The algorithm is characterized by a pressure-correction method with the interfaces represented by volume fractions. Within this flow algorithm, we devise…
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This article reports on the International Nanofluid Property Benchmark Exercise, or INPBE, in which the thermal conductivity of identical samples of colloidally stable dispersions of nanoparticles or nanofluids, was measured by over 30 organizations…
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Theory and simulations are presented indicating that imaging at the second-harmonic frequency does not solve the problem of ultrasonic wave aberration. The nonlinearity of acoustic wave propagation in biological tissue is routinely exploited in…
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Many test problems have been posed in which the behavior of schemes may be examined within the simplified context of passive tracer transport. Most often these tests involve transport of a tracer containing sharp or discontinuous gradients within a…
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The Boltzmann collision operator for a dilute granular gas of inelastic rough hard spheres is much more intricate than its counterpart for inelastic smooth spheres. Now the one-body distribution function depends not only on the translational…
Papers in associated sub-disciplines
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