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Title: Steady State and Dynamic CFD Simulation of MSF Condenser
Authors: Fatma Yassen Juber 
Supervisor: Prof. Hisham Ettouney
Keywords: Dynamic CFD Simulation of MSF Condenser
Issue Date: 2018
Publisher:  Kuwait university - college of graduate studies
Abstract: This study focuses on computer fluid dynamics (CFD) simulation of the condensation process in around the condenser tubes of the multistage flash desalination process (MSF). This simulation study is the first to be done to the MSF process. Literature review shows existence of CFD simulation studies of condensers in other industrial processes. The CFD model simulates two dimensional and steady state MSF condensers. The simulation of the condenser tube arrangement was scaled down by a factor of ten. This required adjustment of inlet vapor flow rate, stage dimensions, tube diameter and number of tubes in order to generate an identical value for the vapor phase Reynolds number and major aspect ratios, which the number of vertical and horizontal tube rows, number of tubes in each row, and the width to length ratios. The condenser analysis is made for high and low saturation temperatures, laminar and turbulent flow assumptions, two vapor velocities and account of gravity effects. Results and analysis show very distinctive flow patterns for laminar and turbulent assumptions. The laminar flow results showed flow of the vapor phase in titled passes around the top rows of the condenser tubes, which the lower rows of the condenser tubes were mostly surrounded by condensate. The extent of the vapor passes at the top increased at higher vapor velocities. The turbulent flow results showed a quite different pattern, where the temperature isotherms were of a horizontal form instead of titled diagonal form as in the laminar flow. Therefore, the condensation front is formed in the lower part of the condenser tubes. The gravity effect is studied for both the laminar and turbulent flow models. In either case, negligible effect is found in all system variables, which includes temperature distribution, velocity field, and phase change map. This behavior was caused by the small temperature difference with the system, which had minimum effect on either the vapor or liquid density and in turn on inertial effect and other thermal properties. The final part of this study focused on study and analysis of system dynamics of the MSF condenser. The dynamics studies is limited to obtaining the unsteady state temperature, velocity and phase change fields from an initial condition of uniform temperature. The results show that the system achieves steady state conditions within a short period of 10 seconds. The dynamic model results will prove to be highly valuable to study various schemes for condenser control. v
Appears in Programs:0670 Systems and Process Control Engineering

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