Results 251 to 260 of about 4,165,741 (291)

Critical Flow Properties of Steam

SPE Latin America Petroleum Engineering Conference, 1990
ABSTRACT Understanding the thermodynamic properties of steam at critical flow conditions is important to the design, operation and management of steam distribution network and hence the cost of production in steam-enhanced recovery projects.
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Critical Layers m Parallel Flows

Studies in Applied Mathematics, 1972
Finite amplitude neutrally stable two‐dimensional disturbances in parallel flows are determined for large Reynolds numbers when both nonlinearity and viscosity are important in the critical layer. The phase shift across the critical layer depends on the local vertical Reynolds number in the critical layer, and it varies monotonically between the value ...
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Critical analysis of the particle flow filter

2015 International Conference on Control, Automation and Information Sciences (ICCAIS), 2015
The particle flow filter (PFF) has been claimed to have superior performance in terms of accuracy and computational speed compared with existing nonlinear filters. We carefully examine the PFF algorithm and homotopy used in the PFF. We find three problems in the formulation of the PFF. First, homotopy used in the PFF violates the definition of homotopy.
Mahendra Mallick, Sindhu B.
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Unsteady Near‐Critical Flows in Microgravity

Annals of the New York Academy of Sciences, 2004
Abstract: This paper presents analysis of the different time scales associated with unsteady fluid flow phenomena near the thermodynamical critical point and that are typical for experiments carried out in microgravity. A focus of the paper is modeling the initial stage of convection under low and zero gravity on the basis of the two‐dimensional ...
V I, Polezhaev, A A, Gorbunov, E B, Soboleva   +2 more
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Critical threshold in pipe flow transition

Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences, 2008
This study provides a numerical characterization of the basin of attraction of the laminar Hagen–Poiseuille flow by measuring the minimal amplitude of a perturbation required to trigger transition. For pressure-driven pipe flow, the analysis presented here covers autonomous and impulsive scenarios where either the flow is perturbed with an
Mellibovsky, Fernando, Meseguer, Alvaro
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A mixed criticality approach for the security of critical flows in a network-on-chip

ACM SIGBED Review, 2016
In this paper, we explore a new approach for the security of flow transmission in a Network-on-Chip. This approach is based on a dual mixed criticality approach where the criticality of a flow (HI or LO) is associated to timeliness and security constraints on flow transmission. Flow of HI criticality should be protected from Denial of Service (DoS) and
Ermis Papastefanakis, Xiaoting Li 0002, Laurent George 0001   +2 more
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Maximum Flows and Critical Vertices in AND/OR Graphs

2002
We will study this problem and present an algorithm for finding the minimum-time-cost solution graph in an AND/OR graph. We will also study the following problems which often appear in industry when using AND/OR graphs to model manufacturing processes or to model problem solving processes: finding maximum (additive and nonadditive) flows and critical ...
Yvo Desmedt, Yongge Wang 0001
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ORIFICE COEFFICIENTS FOR CRITICAL FLOW PROVERS

Proceedings of Fall Meeting of the Society of Petroleum Engineers of AIME, 1964
Publication Rights Reserved This paper is to be presented at the 39th Annual Fall Meeting to be held in Houston, Tex., on Oct. 11–14, 1964, and is considered property of the Society of Petroleum Engineers. Permission to publish is hereby restricted to an abstract of not more than 300 words, with no illustrations, unless the paper is ...
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Super-Fine Structure in the Critical Flow-Rate of Critical Flow Venturi Nozzles

Volume 1: Fora, Parts A and B, 2002
It is shown that critical flow Venturi nozzles need time intervals, i.e., more than five hours, to achieve steady state conditions. During these intervals, the discharge coefficient varies gradually to reach a value inherent to the pressure ratio applied. When a nozzle is suddenly put in the critical condition, its discharge coefficient is trapped at a
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Hydraulically Critical Rotating Flow

The Physics of Fluids, 1972
Uniform flow in a rotating open channel becomes “critical” when it exceeds the speed of free Kelvin waves. Transition of subcritical geostrophic flow is discussed.
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