Volume 19, Issue 3 (2019)                   Modares Mechanical Engineering 2019, 19(3): 549-558 | Back to browse issues page

XML Persian Abstract Print


Download citation:
BibTeX | RIS | EndNote | Medlars | ProCite | Reference Manager | RefWorks
Send citation to:

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) :549-558
URL: http://journals.modares.ac.ir/article-15-19609-en.html
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:   (1042 Views)
In the present study, the performance of zigzag demister has been numerically investigated for the separation of dispersed liquid droplets from the gas flow. In general, liquid droplets are dispersed from the gas flow in contact with the vane demister and the formation of the liquid film. Depending on the energy of the droplet collision to the surface, it is likely to occur splash drop into smaller droplets, which will reduce the separation efficiency of the system. In this study, by focusing on the flow collision regime near the surface, it is attempted to investigate the effect of the flow parameters and vane geometry on the separation efficiency and the pressure drop of flow. The Euler-Lagrange is used to simulate the flow and particle motion path. In this research, an experimental model is designed and constructed. Numerical solver results are validated, using the experimental data. The result of this study shows that separation efficiency decreased with increasing gas flow velocity, such that by increasing the 2.5 times of gas velocity, the separation efficiency will lead to a 10% decrease. It was also found that increasing the diameter and increasing the droplet would increase the separation efficiency. On the other hand, choosing the geometry of vane has a significant effect on the amount of the pressure drop of the passing flow. In a way that, by increasing the 50% of the vane angle, the pressure drop will increase 5 times.
 
Full-Text [PDF 882 kb]   (320 Downloads)    

Received: 2018/04/30 | Accepted: 2018/10/24 | Published: 2019/03/1

References
1. Galletti C, Brunazzi E, Tognotti L. A numerical model for gas flow and droplet motion in wave-plate mist eliminators with drainage channels. Chemical Engineering Science. 2008;63(23):5639-5652. [Link] [DOI:10.1016/j.ces.2008.08.013]
2. Hamedi Estakhrsar MH, Rafee R. Effects of wavelength 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]
3. Narimani E, Shahhoseini S. Optimization of vane mist eliminators. Applied Thermal Engineering. 2011;31(2):188-193. [Link] [DOI:10.1016/j.applthermaleng.2010.08.031]
4. Wang VI, James PW. Assessment of an eddy-interaction model and its refinements using predictions of droplet deposition in a wave-plate demister. Chemical Engineering Research and Design. 1999;77(8):692-698. [Link] [DOI:10.1205/026387699526827]
5. James PW, Azzopardi BJ, Wang Y, Hughes JP. A model for liquid film flow and separation in a wave-plate mist eliminator. Chemical Engineering Research and Design. 2005;83(5):469-477. [Link] [DOI:10.1205/cherd.03363]
6. Zhao J, Jin B, Zhong Z. Study of the separation efficiency of a demister vane with response surface methodology. Journal of Hazardous Materials. 2007;147(1-2):363-369. [Link] [DOI:10.1016/j.jhazmat.2007.01.046]
7. Kavousi F, Behjat Y, Shahhosseini S. Optimal design of drainage channel geometry parameters in vane demister liquid–gas separators. Chemical Engineering Research and Design. 2013;91(7):1212-1222. [Link] [DOI:10.1016/j.cherd.2013.01.012]
8. Venkatesan G, Kulasekharan N, Iniyan S. Influence of turbulence models on the performance prediction of flow through curved vane demisters. Desalination. 2013;329:19-28. [Link] [DOI:10.1016/j.desal.2013.09.001]
9. 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]
10. Venkatesan G, Kulasekharan N, Iniyan S. Design and selection of curved vane demisters using Taguchi based CFD analysis. Desalination. 2014;354:39-52. [Link] [DOI:10.1016/j.desal.2014.09.018]
11. ANSYS. ANSYS Fluent Tutorials Release 16.0. [Internet]. Canonsburg: ANSYS; 2014 [cited 2017 September 23]. Available from: http://www.afs.enea.it/project/neptunius/docs/fluent/html/th/node262.htm [Link]
12. Mundo C, Sommerfeld M, Tropea C. Droplet-wall collisions: Experimental studies of the deformation and breakup process. International Journal of Multiphase Flow. 1995;21(2):151-173. [Link] [DOI:10.1016/0301-9322(94)00069-V]
13. O'Rourke PJ, Amsden AA. A spray/wall interaction submodel for the KIVA-3 wall film model. SAE International. 2000;109:281-298. [Link] [DOI:10.4271/2000-01-0271]
14. Liang L, Shelburn A, Wang C, Hodgson D, Meeks E. Implementation and validation of spray/wall interaction models in immersed boundary CFD. International Multidimensional Engine Modeling User's Group Meeting. Detroit, Michigan: Reaction Design Company; 2013. [Link]
15. Kouhikamali R, Noori Rahim Abadi SM, Hassani M. Numerical study of performance of wire mesh mist eliminator. Applied Thermal Engineering. 2014;67(1):214-222. [Link] [DOI:10.1016/j.applthermaleng.2014.02.073]

Add your comments about this article : Your username or Email:
CAPTCHA

Send email to the article author