Volume 20, Issue 8 (August 2020)                   Modares Mechanical Engineering 2020, 20(8): 2029-2043 | Back to browse issues page

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1- Energy Conversion Department, Mechanical Engineering Faculty, University of Guilan, Rasht, Iran
2- Energy Conversion Department, Mechanical Engineering Faculty, University of Guilan, Rasht, Iran , kouhikamali@guilan.ac.ir
Abstract:   (2234 Views)
In the current study, experimental and numerical methods have been used to investigate the pressure drop and the separation efficiency of wire mesh demisters in an air-water system. Using the designed and manufactured experimental model, various parameters such as air velocity, packing density, and wire diameter in plastic and metallic demisters have been studied. Numerical simulation was carried out in two-dimensional and transient form using K-epsilon (k-ε) turbulence model in commercial software ANSYS Fluent and validated against experimental results. The Eulerian-Lagrangian discrete phase model was also used to simulate the water droplet trajectory at diameters of 0.2 and 0.05mm. The numerical simulation results are sufficiently accurate compared to the experimental data. The numerical solver predicts separation efficiency with error of about 20% and pressure drop with error of less than 20% compared to experimental data. The numerical simulation results show that increasing the diameter of water droplets at higher air velocities and higher packing densities is more effective and increases the separation efficiency up to 36%. Also, increasing the packing density increases the separation efficiency for droplets with a diameter of 0.2mm and decreases the separation efficiency for droplets with a diameter of 0.05mm. The results show that the separation efficiency of plastic demister is more than the separation efficiency of metallic demister and in lower packing densities, the use of plastic demister is advisable.
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Article Type: Original Research | Subject: Computational Fluid Dynamic (CFD)
Received: 2019/10/5 | Accepted: 2020/05/15 | Published: 2020/08/15

References
1. Ludwig EE. Applied process design for chemical and petrochemical plants. Houston: Gulf Publishing Company; 1977. [Link]
2. El-Dessouky HT, Alatiqi IM, Ettouney HM, Al-Deffeeri NS. Performance of wire mesh mist eliminator. Chemical Engineering Processing: Process Intensification. 2000;39(2):129-139. [Link] [DOI:10.1016/S0255-2701(99)00033-1]
3. Setekleiv AE, Helsør T, Svendsen HF. Operation and dynamic behavior of wire mesh pads. Chemical Engineering Science. 2012;68(1):624-639. [Link] [DOI:10.1016/j.ces.2011.10.027]
4. Janajreh I, Hasania A, Fath H. Numerical simulation of vapor flow and pressure drop across the demister. Energy Conversion Management. 2013;65:793-800. [Link] [DOI:10.1016/j.enconman.2012.03.011]
5. Kouhikamali R, Noori Rahim Abadi SMA, Hassani M. Numerical study of performance of wire mesh mist eliminator. Applied Thermal Engineering. 2014;67(1-2):214-222. [Link] [DOI:10.1016/j.applthermaleng.2014.02.073]
6. Liu Y, Yu D, Jiang J, Yu X, Yao H, Xu M. Experimental and numerical evaluation of the performance of a novel compound demiste. Desalination. 2017;409:115-127. [Link] [DOI:10.1016/j.desal.2017.01.022]
7. Yao Y, Pavlenko AN, Volodin OA. Effects of layers and holes on performance of wire mesh packing. Journal of Engineering Thermophysics. 2015;24(3):222-236. [Link] [DOI:10.1134/S1810232815030042]
8. Al-Fulaij H, Cipollina A, Micale G, Ettouney H, Bogle D. Eulerian-lagrangian modeling and computational fluid dynamics simulation of wire mesh demisters in MSF plants. Desalination. 2016;385:148-157. [Link] [DOI:10.1016/j.desal.2016.02.019]
9. Hamedi Estakhrsar MH, Rafee R. Effects of wave length and number of bends on the performance of zigzag demisters with drainage channels. Applied Mathematical Modelling. 2016;40(2):685-699. [Link] [DOI:10.1016/j.apm.2015.08.023]
10. Zhao J, Jin B, Zhong Z. Study of the separation efficiency of a demister vane with response surface methodology. Journal of Hazardous Material. 2007;147(1-2):363-369. [Link] [DOI:10.1016/j.jhazmat.2007.01.046]
11. Narimani E, Shahhoseini S. Optimization of vane mist eliminators. Applied Thermal Engineering. 2011;31(2-3):188-193. [Link] [DOI:10.1016/j.applthermaleng.2010.08.031]
12. Venkatesan G, Kulasekharan N, Iniyan S. Numerical analysis of curved vane demisters in estimating water droplet separation efficiency. Desalination. 2014;339:40-53. [Link] [DOI:10.1016/j.desal.2014.02.013]
13. Venkatesan G, Kulasekharan N, Muthukumar V, Iniyan S. Regression analysis of a curved vane demister with Taguchi based optimization. Desalination. 2015;370:33-43. [Link] [DOI:10.1016/j.desal.2015.05.011]
14. Guan L, Yuan Z, Yang L, Gu Z. Numerical study on the penetration of droplets in a zigzag demister. Environmental Engineering Science. 2016;33(1):35-43. [Link] [DOI:10.1089/ees.2014.0367]
15. Koopmana HK, Köksoy C, Ertun Ö, Lienhart H, Hedwig H, Delgado A. An analytical model for droplet separation in vane separators and measurements of grade efficiency and pressure drop. Nuclear Engineering Design. 2014;276:98-106. [Link] [DOI:10.1016/j.nucengdes.2014.05.034]
16. Karimi M, Kouhikamali R. Numerical and experimental investigation of the effect of droplet collision regime to surface on the performance of the separation of water droplets from air in a zigzag demister. Modares Mechanical Engineering. 2019;19(3):594-558. [Persian] [Link]
17. ANSYS. ANSYS FLUENT Theory Guide [Internet]. Canonsburg: ANSYS; 2015 [Unknown Cited]. Available from: Not found [Link]

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