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  • Duc, Nguyen The  (5)
  • Hai, Duong Ngoc  (5)
  • 1
    Online Resource
    Online Resource
    Rheological properties of emulsion of crude oil and water
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 1999
    In:  Vietnam Journal of Mechanics Vol. 21, No. 4 ( 1999-12-30), p. 213-230
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 21, No. 4 ( 1999-12-30), p. 213-230
    Abstract: In the paper the rheological properties of crude oil of White Tiger oil-field (Vietnam) and its emulsion with sea-water, including measurement results and analytical approximation formulae for wide range of pressure, temperature and water concentration, are presented. As it is known, the crude oil of White Tiger oil-field is a high-paraffin and high-viscous oil. At the low temperature (T ≤ 40°C) it behaves as non-Newtonian fluid of Bingham-Shvedov group. Therefore, beside the effective viscosity, the effective dynamic shear stress is also measured and approximated. The rheological properties of crude oil and emulsion of crude oil and water are also measured and approximated for the case when the mixture contains 0.1% chemical reagent ES-3363.
    Type of Medium: Online Resource
    ISSN: 2815-5882 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/10003
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 1999
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Wind field over complex terrain and air quality modeling
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 1997
    In:  Vietnam Journal of Mechanics Vol. 19, No. 4 ( 1997-12-30), p. 29-38
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 19, No. 4 ( 1997-12-30), p. 29-38
    Abstract: None
    Type of Medium: Online Resource
    ISSN: 2815-5882 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/10065
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 1997
    Location Call Number Limitation Availability
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Numerical simulation of pollutant dispersion near obstacle based on k - ɛ turbulence closure scheme
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2002
    In:  Vietnam Journal of Mechanics Vol. 24, No. 4 ( 2002-12-31), p. 219-235
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 24, No. 4 ( 2002-12-31), p. 219-235
    Abstract: To simulate the wind field, pollutant transport and dispersion near an obstacle a numerical code based on the k - Ɛ turbulence model has been built. Beside the standerd k - Ɛ, two other modifications proposed by Detering & Etling and Duynkerke are also considered. The calculation results are verified based on the measurement data of von Karman Institute for Fluid Dynamics (Belgium). Modifications of the turbulent Schmidt number were carried out in order to match the measured results. The code was used to investigate the influence of the recirculation zone behind a building of cubical shape on the transport and disersion of pollutant. For a stack behind and near the obstacle, some conclusions about the effect of the stack height and stack location were derived.
    Type of Medium: Online Resource
    ISSN: 2815-5882 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/24/4/6622
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2002
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  • 4
    Online Resource
    Online Resource
    Numerical study of the recirculation zone behind a building in the neutral and stable atmospheric boundary layer
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2002
    In:  Vietnam Journal of Mechanics Vol. 24, No. 2 ( 2002-06-30), p. 84-100
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 24, No. 2 ( 2002-06-30), p. 84-100
    Abstract: The objective of the paper is to study numerically, using k - Ɛ model, the circulation zone behind a building under neutral and stable conditions. The influences of wind speed, vertical gradient of the temperature, surface roughness and building height on the length and structure of the recirculation zone are investigated. The research result showed that the recirculation area extends from immediately behind the building to a distance of about 2.5 times, in maximum, of the dimension of the building. The recirculation zone's 1length increases with the increase of wind speed, decreases with the increase of vertical gradient of the temperature, decreases with the increase of roughness and increases with the increase of building height. Some exceptions of two last tendencies may occur for the cases of high surface roughness or high building, when the flow shift from a simple one-vortex to a complex multiple-vortex structure.
    Type of Medium: Online Resource
    ISSN: 0866-7136 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/24/2/6611
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2002
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  • 5
    Online Resource
    Online Resource
    A three dimensional non-hydrostatic model for turbulent air flow
    Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications) ; 2000
    In:  Vietnam Journal of Mechanics Vol. 22, No. 3 ( 2000-09-30), p. 167-180
    Details
    In: Vietnam Journal of Mechanics, Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications), Vol. 22, No. 3 ( 2000-09-30), p. 167-180
    Abstract: A finite-volume code is developed to compute the turbulent airflow over small- scale complex terrain. A pressure-correction algorithm is used to solve the three-dimensional non-hydrostatic flow equations. The turbulent transport is simulated by the k- € model using some modifications suitable for atmospheric boundary-layer application. As an example, the model is used to simulate the flow-field around a cubical building. The same flow as a towing-tank experiment of USEPA was simulated using our code. These simulations show that, the model was capable of simulating recirculation zones behind the building. The results of calculation are also compared with available measurement data.
    Type of Medium: Online Resource
    ISSN: 2815-5882 , 0866-7136
    URL: Article
    DOI: 10.15625/0866-7136/9973
    Language: Unknown
    Publisher: Publishing House for Science and Technology, Vietnam Academy of Science and Technology (Publications)
    Publication Date: 2000
    Location Call Number Limitation Availability
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    Online Resource
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