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Vũng Tàu, Vietnam

Van Sy L.,PetroVietnam University
Particulate Science and Technology | Year: 2016

Gas-liquid cylindrical cyclone (GLCC) separator is widely used in the petroleum industry with potential field applications. Its performance is strongly influenced by the inlet configuration. The 27° optimal inclined inlet angle has been experimentally observed for GLCC with the same diameter of body and inlet. For other GLCCs, the effect of inlet angle on flow pattern and their performances have not been investigated. The main target of the current study is to deeply understand the changes of flow pattern with respect to different inclined angles and flow conditions. Twelve GLCCs with different inclined angles were numerically investigated by using the Reynold stress turbulence model to predict the flow pattern with GLCC. The distribution of radial, axial, and tangential velocity profiles and their maximum magnitudes with respect to the change of inlet angle were carefully considered in this study. 2016 Copyright © Taylor & Francis Group, LLC Source

Sy L.V.,PetroVietnam University | Nam N.T.,National Key Laboratory of Digital Control and System Engineering
Journal of Manufacturing Technology Research | Year: 2015

In this paper, the formability of magnesium alloy sheet (AZ31) is analyzed through effect of strain rate (in terms of depth step and feedrate) and temperature in a warmincremental forming process. This novel manufacturing process is utilized to produce easily the complex products from sheet materials with low cost and short setting time by using a CNC movement of non-cutting hemispherical tool. For this research, the results of the tensile tests and microstructure of AZ31 sheet at various temperatures between 25◦C and 300◦C are analyzed and discussed relative to strain rate sensitivity, ductility, strength and anisotropy. The series of incremental forming experiments with respect to the temperatures and strain rates were also carried out to identify these effects on the formability of AZ31 sheet. Their effects on the formability of incremental forming process are demonstrated and discussed. The results showed that the higher the testing temperature is set, the higher the strain at fracture is, while the influence of the strain rate is opposite. Reduction of the forming time by increasing both depth step and feedrate with respect to certain temperature can be identified. The optimum temperature of 300◦C for high value of strain rate and 250◦C for intermediate value of strain rate should be applied for warm incremental forming process. © Nova Science Publishers, Inc. Source

Liu Z.,Guangxi University for Nationalities | Van Loi N.,PetroVietnam University | Obukhovskii V.,Voronezh State Pedagogical University
International Journal of Bifurcation and Chaos | Year: 2013

In this paper, by using the topological degree theory for multivalued maps and the method of guiding functions, the existence and global bifurcation for periodic solutions of a class of differential variational inequalities are studied. © World Scientific Publishing Company. Source

Nam N.D.,Deakin University | Nam N.D.,PetroVietnam University | Mathesh M.,Deakin University | Hinton B.,Deakin University | And 2 more authors.
Journal of the Electrochemical Society | Year: 2014

A series of rare earth 4-hydroxycinnamate compounds including Ce(4OHCin)3, La(4OHCin)3, and Pr(4OHCin)3 has been synthesized and evaluated as novel inhibitors for carbon dioxide corrosion of steel in CO2-saturated sodium chloride solutions. Electrochemical measurements and surface analysis have shown that these REM(4OHCin)3 compounds effectively inhibited CO2corrosion by forming protective inhibiting deposits that shut down the active electrochemical corrosion sites on the steel surface. Inhibition efficiency was found to increase in the order Ce(4OHCin)3 < La(4OHCin)3 < Pr(4OHCin)3 and with increase in inhibitor concentration up to 0.63 mM. Detailed insights into corrosion inhibition mechanism of these compounds in carbon dioxide environment are also provided. © 2014 The Electrochemical Society. All rights reserved. Source

Nam N.D.,PetroVietnam University | Vaka M.,Deakin University | Tran Hung N.,Institute of Chemistry and Materials Science
Journal of Power Sources | Year: 2014

To gain high hardness, good thermal stability and corrosion resistance, multicomponent TiAlSiN coating has been developed using different deposition methods. In this study, the influence of Al and Si on the electrochemical properties of TiN-coated 316L stainless steel as bipolar plate (BP) materials has been investigated in simulated proton exchange membrane fuel cell environment. The deposited TiN, TiAlN and TiAlSiN possess high hardness of 23.9, 31.7, 35.0 GPa, respectively. The coating performance of the TiN coating is enhanced by Al and Si addition due to lower corrosion current density and higher Rcoating and Rct values. This result could be attributed to the formation of crystalline-refined TiN(200), which improves the surface roughness, surface resistance, corrosion performance, and decreased passive current density. © 2014 Elsevier B.V. All rights reserved. Source

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