scholarly journals CFD modelling of the condensation, evaporation, coagulation and crystallization processes in the cooling tower emissions

2021 ◽  
Vol 2088 (1) ◽  
pp. 012013
Author(s):  
M I Ershov ◽  
V G Tuponogov ◽  
N A Abaimov ◽  
M A Gorsky
Keyword(s):  
Single Phase ◽  
Cooling Tower ◽  
Cfd Model ◽  
Lagrangian Particle Tracking ◽  
Lagrangian Particle ◽  
Cfd Modelling ◽  
Ansys Fluent ◽  
Flow Modelling ◽  
Fluent Software ◽  
Modelling Approach

Abstract The aim of the paper is to develop the CFD model for the environmental impact assessment of the cooling tower. The methods applied for this problem are the single-phase turbulent multispecies flow modelling with the DPM Lagrangian particle tracking. The simulations have been carried out in the steady state SIMPLE solver using the ANSYS Fluent software. User Defined Functions have been defined to enhance the accuracy and versatility of the modelling approach in terms of turbulence, fog formation, evaporation, coagulation and crystallization modelling. The Chalk Point cooling tower experiment, laboratory tests with freezing droplets and analytical correlations are used to verify the customized parts of the new CFD model. The arbitrary small-town geometry is used to demonstrate the simulation capabilities of the fog and drift deposition as well as the temperature and relative humidity values near ground and buildings. The results indicate that the new CFD model is able to predict the cooling tower plume parameters, icing and salt contamination risks as well as drift deposition.

scholarly journals Optimization of guide vane positions in bended inflow of mechanical draft wet-cooling tower

2011 ◽  
Vol 32 (3) ◽  
pp. 263-272
Author(s):  
Adam Klimanek ◽  
Tomasz Musioł ◽  
Adam Stechman
Keyword(s):  
Standard Deviation ◽  
Velocity Distribution ◽  
Objective Function ◽  
Cooling Tower ◽  
Guide Vane ◽  
Optimization Procedure ◽  
Cfd Model ◽  
Air Velocity ◽  
Ansys Fluent ◽  
Flow Solver

Optimization of guide vane positions in bended inflow of mechanical draft wet-cooling tower Optimization of vane positions in a mechanical draft wet-cooling tower is presented in this paper. The originally installed, equally spaced, vanes produced non-uniform air velocity distribution reducing the performance of the fill of the cooling tower. A 2D CFD model of the tower has been created. The model has then been used to determine the objective function in the optimization procedure. The selected objective function was the standard deviation of the velocity of air entering the fill. The Goal Driven Optimization tools of the ANSYSWorkbench 2.0 have been used for the optimization and the ANSYS Fluent 13.0 as a flow solver. The optimization allowed reduction of the objective function and producing a more uniform air flow.

Determination of the Dynamic Characteristics of a Hydraulic Reservoir for its Air Release Efficiency Using Multiphase CFD Model

2018 ◽  
Author(s):  
Rahelehsadat Mostafavi ◽  
Dominic Tiffin ◽  
Katharina Schmitz
Keyword(s):  
Hydraulic Systems ◽  
Cfd Model ◽  
Lagrangian Particle Tracking ◽  
Flow Conditions ◽  
Lagrangian Particle ◽  
Air Content ◽  
Oil Flow ◽  
Key Variables ◽  
Multiphase Cfd

Undissolved air in oil causes various problems for hydraulic systems and strongly decreases the efficiency of the system. In this respect, the hydraulic reservoir as the only component that performs the function of releasing the accumulated air from the system is relevant. In recent years, the air release efficiency in hydraulic reservoirs has been studied both experimentally and in simulation. However, in none of the according studies dynamically changing flow conditions have been considered. In this paper, the air release behaviour of a hydraulic reservoir is investigated through simulation, considering the dynamics of the system. The developed multiphase CFD model utilizes the open-source CFD tool, OpenFOAM®, based on a Lagrangian Particle Tracking (LPT) within an Eulerian phase. The simulations have been conducted varying the key variables such as oil flow rate and air load at the inlet of the reservoir and yield the air content at the outlet.

scholarly journals An investigation of the aerodynamic parameters for Solar Plane wing profile using CFD modelling

2021 ◽  
Vol 22 (1) ◽  
Author(s):  
Marek Jaszczur ◽  
Karolina Papis ◽  
Michał Książek ◽  
Grzegorz Czerwiński ◽  
Gabriel Wojtas ◽  
...  
Keyword(s):  
Fluid Dynamic ◽  
Model Development ◽  
Solar Panels ◽  
Cfd Modelling ◽  
Ansys Fluent ◽  
Induced Drag ◽  
Image Velocimetry ◽  
Fluent Software ◽  
Aerodynamic Parameters ◽  
Solar Powered

The technology of solar-powered aerial vehicles requires enormous financial support and further development. For this purpose, the computational fluid dynamic can be used. In order to carry out necessary analyses and model development in this research, ANSYS Fluent software was used. Using the first version of the AGH Solar Plane model, preliminary analysis of lift, drag and tearing off the stream were performed. Numerical experiments made it possible to verify many various profiles and final selection that the best suits the target model. Through these studies, it was also possible to analyse fluid flow at various speeds and angles of attack. This provided an insight into important aspects of vehiclesaerodynamic design, which should be taken into account when making the second model version. At this stage, the classical and laminar - Wortmann aerodynamic profiles were selected on the basis of the aerodynamic perfection criterion. Moreover, four new geometries were prepared on which the flattening of upper surfaces (for fixing solar panels) was tested. The results of the numerical analysis were validated in the aerodynamic tunnel using particle image velocimetry method. Taking into account all analyses, a number of recommendations have been prepared that will be implemented in order to create an aircraft, which meets all target requirements. Some of these hints were: testing new ways of connecting the wing to the nacelle, which would reduce the drag as well as considering the usage of winglets in order to minimize induced drag.

CFD Modeling of an Entrained Flow Gasifier

2013 ◽  
Vol 448-453 ◽  
pp. 1624-1627
Author(s):  
Xiao Yan Gao ◽  
Ya Ning Zhang ◽  
Bing Xi Li ◽  
Lu Dong
Keyword(s):  
Numerical Model ◽  
Biomass Gasification ◽  
Cfd Modeling ◽  
Cfd Model ◽  
Ansys Fluent ◽  
Entrained Flow ◽  
Entrained Flow Gasifier ◽  
Fluent Software ◽  
Relative Errors

A 2 D CFD model was established to simulate sawdust gasification in an entrained flow gasifier using Ansys Fluent software. Syngas composition, syngas yield and syngas LHV were evaluated. The simulated syngas compositions were in agreement with the experiment results. The relative errors of syngas yield and LHV varied in the ranges of 2-15% and 1-9%, respectively. The results showed that the numerical model established in this study can be applied to simulate biomass gasification in entrained flow gasifier.

scholarly journals Combined sewer overflow chamber analysis based on CFD modelling.

2021 ◽  
Vol 1209 (1) ◽  
pp. 012019
Author(s):  
J Hrudka ◽  
M Šutúš ◽  
M Csóka ◽  
A Raczková ◽  
I Škultétyová
Keyword(s):  
Cfd Simulation ◽  
Optimal Operation ◽  
Combined Sewer Overflow ◽  
Cfd Modelling ◽  
Ansys Fluent ◽  
Structural Modifications ◽  
Combined Sewer ◽  
Fluent Software ◽  
Sewer Overflow ◽  
The Individual

Abstract The paper deals with CFD simulation of a real combined sewer overflow chamber using Ansys fluent software. Simulations are created for various structural modifications. Within the results, the hydraulic parameters of the individual are evaluated with a proposal for optimal operation of the given relief chamber.

Thermal Behavior of Different Cooling Towers Using Induced Draught Cross Flow

2018 ◽  
pp. 73-88
Author(s):  
Rafid Hannun ◽  
Muntadhar Selman
Keyword(s):  
Thermal Behavior ◽  
Cooling Tower ◽  
Water Pressure ◽  
Cross Flow ◽  
Electrical Energy ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Volume Method ◽  
First Time ◽  
Electrical Energy Generation

Cooling tower is vastly utilized in industries as well as plants such electrical energy generation field and petrochemical industry to subtract the useless heat . In this paper, a thermal behavior of mechanical draft cross flow wet cooling tower is investigated .The theoretical study based on mathematical model of heat and mass transfer whose analyzed by ANSYS fluent software code employed workbench. Three new configurations of cooling tower are studied at the first time that didn’t studied together in literatures. They are cubic, cylindrical, and pyramid shape. The investigation used several inlet water temperature and different pressures of water at inlet and outlet. The numerical solution is based on the finite volume method. The wet bulb temperature of air has constant value for all cases whose studied . The results of study indicated that the cylindrical configuration is the best geometry. When inlet water pressure get up at constant other variables, the performance is decreased as well as it will improved if it reduces. The water cooling range has no influence on the tower characteristics.

An Investigation of the Effect of interrupted fin arrangements on the Thermal Performance of a Heat Sink under a Free Convection Condition

2019 ◽  
Vol 7 (1) ◽  
pp. 43-53
Author(s):  
Abbas Jassem Jubear ◽  
Ali Hameed Abd
Keyword(s):  
Heat Transfer ◽  
Steady State ◽  
Natural Convection ◽  
Thermal Performance ◽  
Heat Sink ◽  
Numerical Study ◽  
Ansys Fluent ◽  
Fluent Software ◽  
Steady State Heat ◽  
Steady State Heat Transfer

The heat sink with vertically rectangular interrupted fins was investigated numerically in a natural convection field, with steady-state heat transfer. A numerical study has been conducted using ANSYS Fluent software (R16.1) in order to develop a 3-D numerical model.  The dimensions of the fins are (305 mm length, 100 mm width, 17 mm height, and 9.5 mm space between fins. The number of fins used on the surface is eight. In this study, the heat input was used as follows: 20, 40, 60, 80, 100, and 120 watts. This study focused on interrupted rectangular fins with a different arrangement and angle of the fins. Results show that the addition of interruption in fins in various arrangements will improve the thermal performance of the heat sink, and through the results, a better interruption rate as an equation can be obtained.

scholarly journals 3D Lagrangian particle tracking of a subsonic jet using multi-pulse Shake-The-Box

2021 ◽  
Vol 123 ◽  
pp. 110346
Author(s):  
Peter Manovski ◽  
Matteo Novara ◽  
Nagendra Karthik Depuru Mohan ◽  
Reinhard Geisler ◽  
Daniel Schanz ◽  
...  
Keyword(s):  
Particle Tracking ◽  
Lagrangian Particle Tracking ◽  
Lagrangian Particle ◽  
Subsonic Jet
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