Two-phase sink vortex suction mechanism and penetration dynamic characteristics in ladle teeming process

2017 ◽  
Vol 24 (7) ◽  
pp. 669-677 ◽  
Author(s):  
Da-peng Tan ◽  
Ye-sha Ni ◽  
Li-bin Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Two Phase ◽  
Sink Vortex

Dynamic Characteristics of Two-Phase Thermal Control System for Spacecraft

1992 ◽  
Author(s):  
Vladimir V. Malozemov ◽  
Natalia S. Kudriavtseva ◽  
Victor A. Antonov ◽  
Oleg V. Zagar ◽  
Nikolai N. Chernobaev
Keyword(s):  
Control System ◽  
Dynamic Characteristics ◽  
Thermal Control ◽  
Two Phase ◽  
Thermal Control System

Development of Models Correlating Vibration Excitation Forces to Dynamic Characteristics of Two-Phase Flow in a Tube Bundle

2007 ◽  
Author(s):  
C. Zhang ◽  
M. J. Pettigrew ◽  
N. W. Mureithi
Keyword(s):  
Dynamic Characteristics ◽  
Two Phase Flow ◽  
Tube Bundle ◽  
Flow Path ◽  
Main Flow ◽  
Phase Flow ◽  
Two Phase ◽  
Drag Forces ◽  
Vibration Excitation ◽  
Lift Forces

Recent experiments reveal that somewhat unexpected but significant quasi-periodic forces in both the drag and lift directions existed in a rotated triangular tube bundle subjected to two-phase cross flow. The quasi-periodic drag forces appear to be related to the momentum flux fluctuations in the main flow path between the cylinders. The quasi-periodic lift forces, on the other hand, are mostly correlated to the oscillation in the wake of the cylinders. The objective of this work is to develop semi-analytical models for correlating vibration excitation forces to dynamic characteristics of two-phase flow in a rotated triangular tube bundle and understanding the nature of vibration excitation forces. The relationships between the lift or drag forces and the dynamic characteristics of two-phase flow are established through fluid mechanics momentum equations. A model has been developed to correlate the void fraction fluctuation in the main flow path and the dynamic drag forces. A second model has been developed for correlating the oscillation in the wake of the cylinders and the dynamic lift forces. Although still preliminary, each model can predict the corresponding forces relatively well.

scholarly journals An Experiment of the Dynamic Characteristics of a Two-Phase Flow Thermal Control System.

2003 ◽  
Vol 69 (677) ◽  
pp. 100-106 ◽  
Author(s):  
Terushige FUJII ◽  
Katsumi SUGIMOTO ◽  
Eiji NISHIDA ◽  
Masanobu WADA ◽  
Shinichi TOYAMA ◽  
...  
Keyword(s):  
Control System ◽  
Dynamic Characteristics ◽  
Two Phase Flow ◽  
Thermal Control ◽  
Phase Flow ◽  
Two Phase ◽  
Thermal Control System

Dynamic Characteristics Analysis of Two-Phase Flow Diaphragm Pump Based on MATLAB and ADAMS

2012 ◽  
Vol 522 ◽  
pp. 495-502 ◽  
Author(s):  
Tian Biao Yu ◽  
Jia Shun Shi ◽  
Xiao Ping Zheng ◽  
He Bin Liu ◽  
Wan Shan Wang
Keyword(s):  
Dynamic Characteristics ◽  
Two Phase Flow ◽  
High Reliability ◽  
Simulation Software ◽  
Design Parameters ◽  
Phase Flow ◽  
Two Phase ◽  
Diaphragm Pump ◽  
Corrosion Medium ◽  
Reciprocating Pump

Two-phase flow diaphragm pump (hereafter referred to as the diaphragm pump) is a new generation pump of the reciprocating pump, which used to transport high fretting corrosion medium. At present, the diaphragm pump is widely used in many fields such as Non-ferrous metals, Chemical, Coal, Electric power and so on. The diaphragm pump is of the heart of the equipment; therefore it must have the very high reliability. As the important part of diaphragm pump, the dynamic characteristics of the power end will directly affect the behaviors and life of the solid machine. This paper introduces the work principle of the diaphragm pump, carries a simulation to the virtual prototype of the diaphragm pump based on the numerical value analyze software MATLAB and the dynamics of mechanical system simulation software ADAMS and get the relationships between the design parameters and the dynamic characteristics of the power end of diaphragm pump, which provide a theoretical basis for optimizing the diaphragm pump in the future.

STATIC AND DYNAMIC CHARACTERISTICS OF A THREE-LEVEL BOOST CONVERTER

2019 ◽  
Author(s):  
Konstantin Bykov ◽  
Nadezhda Lazareva ◽  
Viktor Yarov
Keyword(s):  
Transfer Function ◽  
Dynamic Characteristics ◽  
Boost Converter ◽  
Two Phase ◽  
Boost Converters ◽  
Static And Dynamic Characteristics

A comparison of two-phase and three-level boost converters for photovoltaic converters is given. The conclusion is made about the advantages of a three-level boost converter, and its model in the form of a transfer function is obtained from the acceleration curve.

Test Results for the Static and Rotordynamic Characteristics of a Long (L/D = 0.75) Smooth Seal in Two-Phase (Mainly Gas) Conditions With a 62-Bar Inlet Pressure

2020 ◽  
Author(s):  
Dung L. Tran ◽  
Dara W. Childs ◽  
Hari Shrestha ◽  
Min Zhang
Keyword(s):  
Dynamic Characteristics ◽  
Gas Turbines ◽  
Flow Model ◽  
Dynamic Stiffness ◽  
Bulk Flow ◽  
Liquid Volume ◽  
Test Results ◽  
Two Phase ◽  
Static And Dynamic Characteristics ◽  
San Andres

Abstract Recent multiphase-pump developments encountered several rotordynamic issues with smooth balance-piston seals, creating a need to better understand the performance of annular seals under multiphase-flow operation. This paper presents measurements of static and dynamic characteristics of a long smooth seal (L/D = 0.75, D = 114.686 mm, and Cr = 0.200 mm) operating under pure- and mainly air condition in which air is mixed with silicone oil (PSF-5cSt). Tests are performed at a supply pressure of 62.1 bars-a, three rotation speeds (5, 10, 15 krpm), three pressure ratios (PRs) (0.6, 0.5, 0.4), for a range of inlet liquid volume fraction (LVFi) from 0% to 8%. The results are then compared to: (1) the previous test reported by Zhang et al. (2017, “Experimental Study of the Static and Dynamic Characteristics of a Long Smooth Seal with Two-Phase, Mainly-air Mixtures,” J. Eng. Gas Turbines Power, 139(12), p. 122504) with similar testing condition but a different seal geometry (L/D = 0.65, D = 89.306 mm, and Cr = 0.188 mm) and (2) the predictions from a bulk-flow model developed by San Andrés (2012, “Rotordynamic Force Coefficients of Bubbly Mixture Annular Pressure Seals,” ASME J. Eng. Gas Turbines Power, 134(2), p. 022503). Results show a significant increase of direct dynamic stiffness KΩ as LVFi increases, especially at low PR. Test results reported by Zhang et al. (2017) has an opposite tendency of KΩ as an impact of increasing LVFi. Concerning cross-coupled dynamic stiffness kΩ and cross-coupled damping c, the results from Zhang et al. (2017) and the present results agree to the effects of changing speed, PR, and LVFi under pure- and mainly air conditions. As LVFi increases, direct damping C increases while test results reported by Zhang et al. (2017) showed no significant increase. Except for the direct dynamic stiffness and the impact of changing LVFi on the cross-coupled dynamic stiffness, the bulk-flow model of San Andrés (2012) predicts decently the tendencies and magnitudes of the rotordynamic coefficients.

scholarly journals Flow Regime Recognition and Dynamic Characteristics Analysis of Air-Water Flow in Horizontal Channel under Nonlinear Oscillation Based on Multi-Scale Entropy

Entropy ◽  
2019 ◽  
Vol 21 (7) ◽  
pp. 667 ◽  
Author(s):  
Bo Sun ◽  
He Chang ◽  
Yun-Long Zhou
Keyword(s):  
Working Conditions ◽  
Dynamic Characteristics ◽  
Two Phase Flow ◽  
Flow Regimes ◽  
Horizontal Channel ◽  
Phase Flow ◽  
Two Phase ◽  
Multi Scale ◽  
Wide Range ◽  
Vibration Parameters

Gas-liquid two-phase flow behavior in horizontal channel under heaving motion showed unique dynamic characteristics due to the complex nonlinear interaction. To further establish a description model and investigate the effects of heaving motion on horizontal gas-liquid flow, experiments in a wide range of vibration parameters and working conditions were carried out by combining vibration platform with two-phase flow loop. It was found that the flow regimes under heaving motion showed significant differences compared to the ones expected in steady state flow under the same working conditions. Increasing vibration parameters showed an obvious impact on fluctuation degree of gas-liquid interface by visualizing high-speed photographs. A method based on multi-scale entropy was applied to identify flow regimes and reveal the underlying dynamic characteristics by collecting signals of pressure-difference. The results indicated that the proposed method was effective to analyze gas-liquid two-phase flow transition in horizontal channel under heaving motion by incorporating information of flow condition and change rate of multi-scale entropy, which provided a reliable guide for flow pattern control design and safe operation of equipment. However, for slug-wave and boiling wave flow, an innovative method based on multi-scale marginal spectrum entropy showed more feasible for identification of transition boundary.

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