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    Using the direct simulation Monte Carlo method to study the effect of wall temperature variation on gas mixing evolution through micro T-mixers

    , Article 11th International Energy Conversion Engineering Conference ; 2013 Darbandi, M ; Sabouri, M ; Lekzian, E ; Schneider, G. E ; Sharif University of Technology
    In this work, we study the gas mixing behavior in a micro T-mixer using the direct simulation Monte Carlo (DSMC) method. The gas mixing process is monitored through a T-mixer, which is fed by two different CO and N2 gases; flowing into the T-mixer through the upper and lower inlets. We investigate the effects of axial and lateral wall temperature gradients on the mixing evolution at different rarefaction levels. The achieved results show that any temperature difference between the channel walls would result in an increase in mixing length for the chosen wall temperature gradient ranges and the studies pressure cases. Our observations show that a positive temperature gradient toward the... 

    Drag reduction in a channel with microstructure grooves using the lattice Boltzmann method

    , Article Journal of Physics D: Applied Physics ; Volume 50, Issue 10 , 2017 ; 00223727 (ISSN) Daeian, M. A ; Moosavi, A ; Nouri Borujerdi, A ; Taghvaei, E ; Sharif University of Technology
    Institute of Physics Publishing  2017
    Using the Shan-Chen lattice Boltzmann multi-phase model, we investigate the effect of adding microstructured grooves to the walls of a 2D parallel-plate channel on the pressure drop in the channel. The effects of the size of the grooves on the pressure drop in the channel were considered. It was observed that the pitch of the grooves has a considerable effect on the pressure drop in the channel, and even for some values of the pitch we observe an increase in the pressure drop. As the pitch decreases, a lower pressure drop is achieved. The results also show that as the ratio of the solid-liquid contact surface to the whole surface is decreased, the pressure drop decreases. It is also observed... 

    Numerical simulation of a cubic spout-fluid bed: influences of inlet gas temperature and jet to bed cross-section ratio

    , Article International Journal of Chemical Reactor Engineering ; Volume 18, Issue 3 , 2020 Rahmani, A ; Tamtaji, M ; Molaei Dehkordi, A ; Sharif University of Technology
    De Gruyter  2020
    In this paper, we study the role of inlet gas temperature and jet to bed cross-section ratio on hydrodynamics and circulation patterns of particles in a spout-fluid bed. The system is modeled using CFD-TFM approach based on Eulerian-Eulerian method. Simulation results are validated by experimental data measured by (Link 2008. "PEPT and Discrete Particle Simulation Study of Spout-fluid Bed Regimes." Aiche Journal 54 (5): 1189-202). First, the sensitivity analysis of simulation results versus the most significant parameters are conducted to find the optimum values for each parameter. Subsequently, the role of inlet gas temperature and cross-section ratios are studied in detail. The simulation... 

    An experimental investigation of asphaltene precipitation during natural production of heavy and light oil reservoirs: The role of pressure and temperature

    , Article Petroleum Science and Technology ; Volume 29, Issue 10 , 2011 , Pages 1054-1065 ; 10916466 (ISSN) Alizadeh, A ; Nakhli, H ; Kharrat, R ; Ghazanfari, M. H ; Sharif University of Technology
    Many oil reservoirs encounter asphaltene precipitation as a major problem during natural production. In spite of numerous experimental studies, the effect of temperature on asphaltene precipitation during pressure depletion at reservoir conditions is still obscure in the literature. To study their asphaltene precipitation behavior at different temperatures, two Iranian light and heavy live oil samples were selected. First, different screening criteria were applied to evaluate asphaltene instability of the selected reservoirs using pressure, volume, and temperature data. Then, a high pressure, high temperature filtration (HPHT) setup was designed to investigate the asphaltene precipitation...