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Total pressure
About: Total pressure is a research topic. Over the lifetime, 5199 publications have been published within this topic receiving 66658 citations.
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TL;DR: In this paper, the kinetics of SiC-based ceramics deposition from CH3SiCl3 (MTS)H2 gas precursor has been investigated over a range of reduced pressure and low temperature, where kinetics are controlled by chemical reactions.
59 citations
TL;DR: In this article, the phase equilibrium in metamorphic rocks is affected by temperature, pressure, the proportions of nonvolatile components, and the chemical potentials of the reacting volatile components.
Abstract: Phase equilibrium in metamorphic rocks is affected by temperature, pressure, the proportions of nonvolatile components, and the chemical potentials of the reacting volatile components. Theory interrelating these variables has been tested by studying the reaction analcite → albite + nepheline + water in the presence of mixtures of water and argon. New data on the system Ar-H2O permit calculation of the composition of the water-argon mixture, which should equilibrate with the phase assemblage analcite + albite + nepheline. Experimental determination of this composition as a function of pressure at constant temperature is in good agreement with the theory.
59 citations
TL;DR: In this article, the use of core-annular flow pattern may be attractive as an artificial lift method in heavy oil wells, which can be induced by the lateral injection of relatively small quantities of water, in order to get a lubricated oil core along the pipe.
Abstract: The use of core-annular flow pattern may be attractive as an artificial lift method in heavy oil wells. This flow pattern can be induced by the lateral injection of relatively small quantities of water, in order to get a lubricated oil core along the pipe. Frictional pressure drop measurements for upward vertical core flow in a 1-in, pipe, using a 17.6-Pa.s, 963-kg/m 3 oil and water at room temperature reported a decrease by over 1000-fold with respect to single-phase oil flow, being comparable to the flow of water alone in the pipe at mixture flow rate. The total pressure drop was reduced by over 45-fold. The frictional pressure drop model proposed includes both irreversible and buoyancy terms. The model was adjusted to fit our data and shows excellent agreement with laboratory data available.
59 citations
TL;DR: In this article, the effects of variable total pressures on the above combustion dynamics are considered, and two conditions, i.e. different constant and time-varying pressures, are considered to investigate the combustion instability in RDE.
Abstract: Instability, extinction and re-initiation of rotating detonation in a two-dimensional Rotating Detonation Engine (RDE) configuration are numerically investigated, and the emphasis is laid on the effects of variable total pressures on the above combustion dynamics. Two conditions, i.e. different constant pressures and time-varying pressures, are considered to investigate the combustion instability in RDE. It is seen that under constant pressure condition the rotating detonation is more prone to instability at low pressure, due to the instability from the deflagrative surface. The intrinsic frequency for the unstable cases with different pressures is close, and maybe related to the RDE configuration and/or fuel properties. For the time-varying pressures with various specified frequencies, the RDE shows the different levels of instability characterized by multiple frequencies. The dominant frequencies vary, depending on the competition between the forced external frequency and the intrinsic one induced by the RDE system. About the extinction of continuously rotating detonation, it can be found that when the total pressure is reduced to a relatively lower value the detonation is quenched and left with deflagrative combustion. Furthermore, when the total pressure is increased based on the extinguished flow fields, detonation fronts are re-initiated due to the local high pressure. The stochasticity in RDE re-initiation has been found, in terms of the location and number of initial detonation front, the propagation direction, their interaction and final stabilization.
59 citations
TL;DR: In this article, a technique for the solution of the conically self-similar form of the Euler equations is described, and solutions for the flow past a flat-plate delta wing at angle of attack are presented.
Abstract: A technique for the solution of the conically self-similar form of the Euler equations is described. Solutions for the flow past a flat-plate delta wing at angle of attack are presented. These solutions show strong leading edge vortices with large total pressure losses in the cores. A study of the effects of various computational parameters on the total pressure loss is made. An explanation for the cause of the total pressure loss is presented. It is shown to be consistent with the results for both a quasi-one-dimensional model problem and the conically self-similar flow past the flat-plate delta wing.
59 citations