توجه: محتویات این صفحه به صورت خودکار پردازش شده و مقاله‌های نویسندگانی با تشابه اسمی، همگی در بخش یکسان نمایش داده می‌شوند.
۱NUMERICAL SIMULATION OF PARTICLE–SURFACE INTERA CTION IN A TURBULENT CHANNEL FLOW
نویسنده(ها): ، ،
اطلاعات انتشار: سیزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۱۰
This study presents a computational model for Lagrangian simulation of particle transport, dispersion, deposition and rebounding in a turbulent channel flow. An empirical mean velocity profile for the fluid velocity and experimental data for turbulent intensities are used for the current case. The instantaneous fluctuating velocities are simulated as continuous Gaussian random fields. The particle equation of motion takes into account the Stokes drag, the Saffman lift, the Brownian, and the gravitational forces. The Brownian diffusion is simulated as a white noise process. Starting with an initially uniform concentration near the wall an ensemble of particle trajectories is generated and statistically analyzed. Several simulations for deposition of aerosol particles of various sizes are performed and the corresponding deposition velocities are evaluated. The effect of particle rebound from surface on particle deposition velocity is also taken into consideration. The computational model predictions for particle deposition velocity are compared with the existing experimental data and earlier simulation results and favorable agreements are observed.<\div>

۲NUMERICAL SIMULATION OF COLD FLOW WATER DIESEL EMULSION SPRAY
نویسنده(ها): ،
اطلاعات انتشار: پانزدهمین کنفرانس سالانه مهندسی مکانیک، سال
تعداد صفحات: ۷
A numerical simulation is performed for spray injection into an initially quiescent air in a constant volume chamber, using OPENFOAM
software. The hybrid, Eulerian–Lagrangian formulation is used where the continuous–phase equations are written in an Eulerian form and the
governing equations for the discrete, spray parcels are considered in a Lagrangian framework. A compressible version of the k– ε model is used for turbulence modeling. The simulation of spray consists of several submodels, including the atomization model, the breakup model, and models for drag and gravitational forces. A case is numerically simulated and compared with experimental data, as well as others' numerical predictions. The present results are in good agreement with the experimental data. Effect of water addition to diesel fuel is studied in cold condition and some characteristics such as the spray structure and size distribution of droplet diameters are presented. Water addition appears to have little
effects on the spray tip penetration, but changes the size of droplets.<\div>
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