Modelling of heat and mass transfer in a horizontal-tube falling-film condenser for brackish water desalination in remote areas

Desalination ◽  
2004 ◽  
Vol 166 ◽  
pp. 17-24 ◽  
Author(s):  
K. Bourouni ◽  
M.T. Chaibi
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Brackish Water ◽  
Horizontal Tube ◽  
Water Desalination ◽  
Falling Film ◽  
Remote Areas

Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes

2007 ◽  
Vol 44 (4) ◽  
pp. 437-444 ◽  
Author(s):  
Jung-In Yoon ◽  
Thanh Tong Phan ◽  
Choon-Geun Moon ◽  
Ho-Saeng Lee ◽  
Seok-Kwon Jeong
Keyword(s):  
Mass Transfer ◽  
Heat And Mass Transfer ◽  
Small Diameter ◽  
Horizontal Tube ◽  
Falling Film ◽  
Transfer Characteristics

scholarly journals Experimental heat and mass transfer studies on horizontal falling film absorber using water-lithium bromide

2020 ◽  
Vol 24 (3 Part B) ◽  
pp. 1923-1934 ◽  
Author(s):  
Banu Arshi ◽  
N.M. Sudharsan
Keyword(s):  
Mass Transfer ◽  
Transfer Coefficient ◽  
Heat And Mass Transfer ◽  
Water Flow Rate ◽  
Lithium Bromide ◽  
Cooling Water ◽  
Horizontal Tube ◽  
Working Fluid ◽  
Falling Film ◽  
Cooling Water Flow Rate

Vapour absorption systems are more viable technology option in energy and environmental perspective in cooling and heating applications. Among the four major components of vapour absorption system, the absorber plays a vital role in deciding the performance, size and cost. Horizontal falling film absorbers comparatively contain good heat and mass transfer characteristics than other type of absorbers for working fluids such as water-lithium bromide. Literature shows that experimental approach of performance evaluation of absorber is more realistic and accurate than the theoretical approach. Hence in the present work, a detail experimental study has been done on horizontal tube falling film absorber using water-lithium bromide as a working fluid. The set-up consists of two major components viz. absorber and generator. Absorber contains three columns of tubes, with eight rows in each column. Detailed parametric study has been done by considering influence of spray density, cooling water-flow rate, cooling water temperature and concentration on solution temperatures, cooling water temperatures, inlet and outlet concentrations, heat flux, mass flux, heat transfer coefficient, and mass transfer coefficient with the help of plots. Results have been validated and literature gaps have been discussed.

Numerical Simulation for Falling Film Thickness around Horizontal Tube in MVC and MED Evaporators

2020 ◽  
Vol 1008 ◽  
pp. 139-150
Author(s):  
Alaa A. Ibrahim ◽  
Hassan E.S. Fath ◽  
Mona G. Ibrahim
Keyword(s):  
Mass Transfer ◽  
Film Thickness ◽  
Heat And Mass Transfer ◽  
Numerical Study ◽  
Numerical Models ◽  
Thickness Distribution ◽  
Horizontal Tube ◽  
Falling Film ◽  
Ansys Fluent ◽  
Intertube Space

Falling film on horizontal tube evaporators, of both Mechanical Vapor Compression (MVC) and the Multi-Effect Distillation (MED) desalination systems, plays an important role in the heat and mass transfer (evaporation) and accordingly the systems productivity. Falling film thickness is mainly influenced by the intertube space, circumferential angle and the film’s Reynolds number. This paper presents two-dimensional numerical study of falling film thickness around horizontal tube in MVC and MED evaporators. The study is based on computational fluid dynamics (CFD) using volume of fraction (VOF) as a multi-phase technique in ANSYS Fluent. The numerical model is developed in order to study the heat and mass transfer charactristics, the liquid falling film behaviour and thickness distribution around circular horizontal. Four CFD study cases are developed to simulate the falling film behaviour at circumferential angle range from 150 to 1650 with inter-tube spacing of 10 mm, 16 mm, 33 mm and 40 mm and for constant value of flow rate and at the same surrounding conditions. Simulations are conducted using a domain of only two tubes with 20 mm outer diameter.The results from the numerical models are compared with the published experimental correlations, showing a comparatively reasonable agreement. In addition, a parametric study is carried out to illustrate the effect of flow Reyonlds number (Re) and intertube space on the average circumferential film thickness and heat transfer rates.

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