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Modeling heat and mass transfer in falling film absorption generators
, Article Scientia Iranica ; Volume 11, Issue 1-2 , 2004 , Pages 81-91 ; 10263098 (ISSN) ; Saidi, M. H ; Mozaffari, A. A ; Heydari, A ; Sharif University of Technology
Sharif University of Technology
2004
Abstract
In this paper, heat and mass transfer phenomena occurring simultaneously in falling film generator of absorption chillers have been studied. The analysis is based on the laminar flow of an Li/Br solution over a horizontal single tube and tube bundle having a constant tube wall temperature. The effect of boiling has been ignored. An extensive numerical code is provided to calculate the heat transfer coefficient and the rate of evaporation. A parametric study is performed on the coefficient of heat transfer and the evaporation flux of the refrigerant. Dimensionless correlations are obtained to calculate the heat transfer coefficient on the horizontal tube and tube bundle. The comparison...
Design and Optimization of Photocatalytic Reactors to Remove Contaminants in the Textile Industry by Advanced Oxidation Method (Emphasizing a Kind of Cationic Azo Color)
, M.Sc. Thesis Sharif University of Technology ; Farhadi, Fathollah (Supervisor) ; Borghei, Mehdi (Supervisor) ; Ghasemi, Shahnaz (Co-Supervisor)
Abstract
With decreasing fresh water availability and growing demand for clean water, alternative water sources are used in many parts of the world. At the same time, the increasing environmental pollution with a variety of manmade chemicals with known or unknown effects on the aquatic wildlife and human health is an uncontested reality. These emerging pollutants include pharmaceuticals and personal care products, pesticides and hormones. Due to the high sensitivity of color pollutants and many concerns about this issue, in this study, by designing and optimizing a falling film reactor, the removal of Basic red 46 dye from water by advanced oxidation method is investigated. The photocatalytic...
Design and Construction of Photocatalytic Reactor for the Removal of
Textile Azo-Dye Pollutants
,
M.Sc. Thesis
Sharif University of Technology
;
Rashtchian, Davood
(Supervisor)
;
Ghasemi, Shahnaz
(Supervisor)
Abstract
Population growth and community development has a large role in the demand for fresh water for a variety of uses. In recent decades, over-harvesting and abusing of water resources has led to water crisis. On the other hand, the increase in various pollutants, in addition to environmental hazards, is a threat to groundwater pollution and the existence of valuable fresh water. Due to the potential hazards of emerging pollutants, new treatment technologies such as advanced oxidation and photocatalytic methods are being developed. One of the contaminants resistant to traditional treatment methods is textile contaminants. In this research, by designing and constructing a photocatalytic reactor,...
Characteristics of heat and mass transfer in vapor absorption of falling film flow on a horizontal tube
, Article International Communications in Heat and Mass Transfer ; Volume 32, Issue 9 , 2005 , Pages 1253-1265 ; 07351933 (ISSN) ; Farhanieh, B ; Sharif University of Technology
2005
Abstract
The absorber is an important component in absorption machines and its characteristics have significant effects on the overall efficiency of absorption machines. This article reports on the results of numerical studies on the characteristics of falling film LiBr-H2O solution on a completely wetted horizontal tube and the associated vapor absorption in the Reynolds number range of 5 < Re < 100. The boundary layer assumptions are used for the transport of mass, momentum and energy equations and the finite difference method is employed to solve the governing equations in the film flow. The heat and mass transfer coefficients are expressed in the forms of Reynolds number, Prandtl number and...