Browse > Article
http://dx.doi.org/10.5762/KAIS.2017.18.2.6

Effect of Orifice Type and Number on the Mixing and Flow Characteristics in In-line Mixer  

Jeong, Seon Yong (School of Mechanical Engineering, Chungbuk National University)
Chung, Won Sik (School of Mechanical Engineering, Chungbuk National University)
Rhi, Seok Ho (School of Mechanical Engineering, Chungbuk National University)
Lee, Kye Bock (School of Mechanical Engineering, Chungbuk National University)
Lee, Dae Gyu (Water Hightech)
Publication Information
Journal of the Korea Academia-Industrial cooperation Society / v.18, no.2, 2017 , pp. 6-13 More about this Journal
Abstract
This study examines the effect of the type and number of orifices in an in-line mixer to improve the mixing performance and pressure loss. Recently, in-line non-power-consuming mixers have been increasingly used to complement mechanical mixers, which have a long dwell time, noise, excessive energy consumption, and high maintenance costs. An in-line mixer with an orifice for efficient mixing in water treatment was examined by numerical analysis using the commercial code FLUENT. The flow characteristics of pressure loss and velocity distribution within the mixer and the mixing efficiency were compared with and without the orifices. The CFD results show that the mixing efficiency was improved, but the pressure loss was increased by the in-line mixer with an orifice. A sensitivity study was also done on the principal parameters.
Keywords
CFD Simulation; Coagulant Dispersion; In-line Mixer; Mixing; Orifice;
Citations & Related Records
Times Cited By KSCI : 2  (Citation Analysis)
연도 인용수 순위
1 S. Kawamura, Integrated Design of Water Treatment Facilities, JOHN WILEY & SONS, INC. New York, 1991.
2 M. M. Clark, J. S. Srivastava, R. R. Lang, L. J. Trussell, D, McCollum, J. D. Bailey, G. Christie, G. Stolarik, Selection and Design of Mixing Processes for Coagulation, AWWA Research Foundation, Denver, USA. 1994.
3 A. Amirtharajah and P. Mills, "Rapid-Mix Design for Mechanisms of Alum Coagulation", Journal of AWWA, vol. 74, no. 5, pp. 210-216, 1992.
4 Y. O. Park, N. S. Park, S. S. Kim, K. D. Kim, K. H. Lim, "Evaluation of coagulants dispersion in pump diffusion mixer for water treatment using CFD technique", Journal of Korean Society of Water and Wastewater, vol. 22, no. 1, pp. 49-63, 2008.
5 H. C. Kim and S. H. Lee, "Pump diffusion flash mixing for improving coagulation process in drinking water treatment", Separation & Purification Technology, vol. 52, pp. 117-125, 2006. DOI: https://doi.org/10.1016/j.seppur.2006.03.022   DOI
6 D. J. Park, Y. O. Park, N. S. Park, S. S. Kim, C. K. Wang, "Evaluation of flow characteristics within in-line mixer for water treatment using CFD technique", Journal of Korean Society of Water and Wastewater, vol. 22, no. 3, pp. 351-358, 2008.
7 S. L. Dixon, Fluid Mechanics and Thermodynamics of Turbomachinery, Butterworth Heinemann, 1998.
8 Y. O. Park, K. D. Kim, N. S. Park, J. L. Lim, K. H. Lim, "Characteristics of coagulants distribution by the pumping rate in pump diffusion mixer", Journal of Korean Society of Water and Wastewater, vol. 22, no. 1, pp. 65-71, 2008.
9 N. S. Park and H. Park, "Analysis of local velocity gradients in rapid mixer using particle image velocimetry technique", Water Science and Technology, Water Supply, vol. 2, no. 5-6, pp. 47-55, 2002.   DOI
10 FLUENT, Fluent 17.1 User's Guide, 2016.
11 H. E. Hudson, and J. P. Wolfner, "Design of Mixing and Sedimentation Basins", Journal of AWWA, vol. 59, no. 10, pp. 1257-1268, 1967.   DOI