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analysis-of-simulations
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Numerical modeling of pulse tube refrigerator and sensitivity analysis of simulation
, Article HVAC and R Research ; Volume 19, Issue 3 , 2013 , Pages 242-256 ; 10789669 (ISSN) ; Saidi, M. H ; Ghahremani, A. R ; Sharif University of Technology
2013
Abstract
In this article a double-inlet pulse-tube refrigerator (DIPTR) is modeled using the nodal analysis technique. The main complexity of the problem is oscillatory and unsteady characteristics of the flow. Solving the flow field in the regenerator section of the system as a porous medium with nonlocal thermal equilibrium is challenging. Governing equations are developed applying mass, energy, and momentum equations to different finite volumes in each component of DIPTR. A numerical code (SharifPTR), with graphical user interface, has been developed to investigate the influence of geometrical and working parameters on performance. The governing equations are a system of boundary value problems....
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 ; Tamtaji, M ; Molaei Dehkordi, A ; Sharif University of Technology
De Gruyter
2020
Abstract
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...