scholarly journals Computational fluid dynamic as a feature to understand the heat and mass transfer in a vacuum tower

2009 ◽  
Author(s):  
K. Ropelato ◽  
A. V. Castro ◽  
W. O. Geraldelli ◽  
M. Mori
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Computational Fluid Dynamic ◽  
Fluid Dynamic ◽  
Vacuum Tower

CFD Simulation of Hydrodynamics, Heat and Mass Transfer Simultaneously in Structured Packing

2008 ◽  
Vol 6 (1) ◽  
Author(s):  
M.R. Khosravi Nikou ◽  
M.R. Ehsani ◽  
M. Davazdah Emami
Keyword(s):  
Experimental Data ◽  
Mass Transfer ◽  
Pressure Drop ◽  
Heat And Mass Transfer ◽  
Cfd Simulation ◽  
Fluid Dynamic ◽  
Theoretical Plate ◽  
Absolute Relative Error ◽  
Gas Liquid Flow ◽  
Counter Current

This paper describes the results of computational fluid dynamic modeling of hydrodynamics, heat and mass transfer simultaneously in Flexipac 1Y operated under a counter-current gas-liquid flow condition. The simulation was performed for a binary mixture of methanol-isopropanol distillation. The pressure drop, the height of equivalent to theoretical plate (HETP) and temperature distribution across the column were calculated and compared with experimental data. The mean absolute relative error (MARE) between CFD predictions and experimental data for the pressure drop, HETP and temperature profile are 20.7%, 12.9% and 2.8%, respectively.

Empty Spray Sections of Vacuum Towers: Heat and Mass Transfer with a CFD approach

2010 ◽  
Vol 5 (1) ◽  
Author(s):  
Karolline Ropelato ◽  
Antonio Castro ◽  
Milton Mori ◽  
Washington Geraldelli
Keyword(s):  
Fluid Dynamics ◽  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Liquid Flow ◽  
The Other ◽  
Lagrangian Model ◽  
Multiphase Model ◽  
Vacuum Tower ◽  
Distillation Columns ◽  
Liquid Suspensions

Distillation columns are the core of a refining process. An understanding of their heat and mass transfer is essential to propose modifications of the equipment. A multiphase model is applied to the vacuum tower with the vapor-liquid flow being modeled with an Eulerian-Lagrangian approach. An ideal multicomponent equilibrium model is adopted to represent the thermodynamics in the heat and mass transfer processes. The characteristic time scales are used in the classification and the understanding of the dominant mechanisms in gas-liquid suspensions. This methodology is general, and therefore can be applied to any turbulent gas-liquid flow. The present work applies a simplified multicomponent Fick's law and gamma-phi approach to liquid-vapor equilibrium in an Eulerian-Lagrangian multiphase flow model in order to get multicomponent heat and mass transfer. The simplification proposed here is that the diffusive flux is independent of the other fluxes. This implies that each flux can be calculated without information on the other fluxes. On the other hand, thermodynamic equilibrium takes all components into account. Thus, it is rigorously calculated. The main target of this work is to gather information on vacuum tower fluid dynamics using an Eulerian-Lagrangian model with computational fluid dynamics (CFD) techniques, which is a powerful tool for better understanding the physical phenomena involved in vacuum towers.

scholarly journals Calculation methods for multicircuit transport network fluid dynamic processes

2018 ◽  
Vol 7 (2.28) ◽  
pp. 228
Author(s):  
Tamara S. Poveshchenko ◽  
Viktoriia O. Podryga ◽  
Yury A. Poveshchenko
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Single Phase ◽  
Solution Method ◽  
Fluid Transport ◽  
Fluid Dynamic ◽  
Emergency Situation ◽  
Calculation Algorithm ◽  
Hydraulic Network ◽  
Pipe Joints

The aim of the work is to create an algorithm for a fast and sufficiently accurate calculation of the parameters of a hydraulic network through which fluid transport is carried out. This type of network is characterized by the presence of a large number of contours, elements for various purposes, and branching. The presence of many contours in the network increases the probability of losing the density of connections, the occurrence of leaks, and accordingly the emergency situation. In paper the construction of a finite-difference scheme and the corresponding calculation algorithm is considered, taking as a basis the model of heat and mass transfer by the flow of a single-phase compressible fluid. The proposed solution method is a generalization of the sweep method to the problems of calculating the heat and mass transfer circuit with an arbitrary number of branching and pipe joints. 

Heat and Mass Transfer Evaluation in the Channels of an Automotive Catalytic Converter by Detailed Fluid-Dynamic and Chemical Simulation

2006 ◽  
Vol 129 (4) ◽  
pp. 536-547 ◽  
Author(s):  
Cinzio Arrighetti ◽  
Stefano Cordiner ◽  
Vincenzo Mulone
Keyword(s):  
Mass Transfer ◽  
Surface Chemistry ◽  
Heat And Mass Transfer ◽  
Ad Hoc ◽  
Catalytic Converter ◽  
Fluid Dynamic ◽  
Three Dimensional ◽  
Local Heat ◽  
Operating Conditions ◽  
Spark Ignition Engines

The role of numerical simulation to drive the catalytic converter development becomes more important as more efficient spark ignition engines after-treatment devices are required. The use of simplified approaches using rather simple correlations for heat and mass transfer in a channel has been widely used to obtain computational simplicity and sufficient accuracy. However, these approaches always require specific experimental tuning so reducing their predictive capabilities. The feasibility of a computational fluid dynamics three-dimensional (3D) model coupled to a surface chemistry solver is evaluated in this paper as a tool to increase model predictivity then allowing the detailed study of the performance of a catalytic converter under widely varying operating conditions. The model is based on FLUENT to solve the steady-state 3D transport of mass, momentum and energy for a gas mixture channel flow, and it is coupled to a powerful surface chemistry tool (CANTERA). Checked with respect to literature available experimental data, this approach has proved its predictive capabilities not requiring an ad hoc tuning of the parameter set. Heat and mass transfer characteristics of channels with different section shapes (sinusoidal, hexagonal, and squared) have then been analyzed. Results mainly indicate that a significant influence of operating temperature can be observed on Nusselt and Sherwood profiles and that traditional correlations, as well as the use of heat/mass transfer analogy, may give remarkable errors (up to 30% along one-third of the whole channel during light-off conditions) in the evaluation of the converter performance. The proposed approach represents an appropriate tool to generate local heat and mass transfer correlations for less accurate, but more comprehensive, 1D models, either directly during the calculation or off-line, to build a proper data base.

Sign in / Sign up

Export Citation Format

Share Document