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    <title>UTas ePrints - Numerical and experimental studies of the flow field in a cyclone dryer</title>
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drop coefficient" name="eprints.keywords" />
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<meta content="The performance of a newly developed cyclone dryer is investigated using RANS-based single-phase computational fluid dynamics (CFD) and experimental model studies. The
cyclone dryer is a cylindrical tower, divided by conical orifices into several chambers; recirculation of the flow within individual chambers ensures adequate retention time for drying of the transported solid material. Numerical calculations are performed using the commercial CFD code CFX5.7 for different mesh types, turbulence models, advection schemes, and mesh resolution. Results of the simulation are compared with data from experimental model studies. The RNG k- turbulence model with hexahedral mesh gives satisfactory results. A significant improvement in CFD prediction is obtained when using a second order accurate advection scheme. Useful descriptions of the axial and tangential velocity distributions are obtained, and the pressure drop across the cyclone dryer chamber is predicted with an error of approximately 10%. The optimized numerical
model is used to predict the influence of orifice diameter and chamber height on total pressure drop coefficient." name="eprints.abstract" />
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<meta content="1 Discroll, R. H., and Adanezak, T., 1985, “Drying Systems for the Humid Tropics. Preserving Grain Quality by Aeration and In-Store Drying,” Proceedings of International Seminar, Kuala Lumpur, Malaysia, Oct. 9–11 1985; B. R. Champ and E. Highley, eds.; AICAR: Canberra, Australia, pp. 58–68.
2 Nebra, S. A., Silva, M. A., and Mujumdar, A. S., 2000, “Drying in Cyclones—A Review,” Drying Technol., 18, pp. 791–832.
3 Korn, O., 2001, “Cyclone Dryer: A Pneumatic Dryer With Increased Solid Residence Time,” Drying Technol., 19, pp. 1925–1937.
4 Heinze, C., 1984, “New Cyclone Dryer for Solid Particles,” Ger. Chem. Eng, 7, pp. 274–279.
5 Ulrich, W., 2002, “Cyclone Dryer,” 13th International Drying Symposium IDS 2002, Beijing, China, Aug. 27–30, Vol. B., pp. 867–873.
6 Boysan, F., Ayers, W. H., and Swithenbank, J., 1982, “A Fundamental Mathematical Modeling Approach to Cyclone Design,” Trans. Inst. Chem. Eng., 16, pp. 222–230.
7 Zhou, L. X., and Soo, S. L., 1990, “Gas-Solid Flow and Collection of Solids in a Cyclone Separator,” Powder Technol., 63, pp. 45–53.
8 Modigell, M., and Weng, M., 2000, “Pressure Loss and Separation Characteristics Calculation of a Uniflow Cyclone With a CFD Method,” Chem. Eng. Technol., 23, pp. 753–758.
9 Hoekstra, A. J., Derksen, J. J., and Van Der Akker, H. E. A., 1999, “An Experimental and Numerical Study of Turbulent Swirling Flow in Gas Cyclones,” Chem. Eng. Sci., 54, pp. 2055–2065.
10 Griffiths, W. D., and Boysan, F., 1996, “Computational Fluid Dynamics CFD and Empirical Modeling of the Performance of a Number of Cyclone Samples,” J. Aerosol Sci., 27, pp. 281–304.
11 Zhao, J. Q., and Abrahamson, J., 1999, “The Flow in Conical Cyclones,” Second International Conference on CFD in the Minerals and Process Industries, Melbourne, Australia, Dec. 6–8, 1999; CSIRO, pp. 497–502.
12 Yoshida, H., Saeki, T., Hashimoto, K., and Fujioka, T., 1991, “Size Classification of Sub-Micron Powder by Air Cyclone and Three-Dimensional Analysis,” J. Chem. Eng. Jpn., 24, pp. 640–647.
13 Yoshida, H., Fukui, K., Yoshida, K., and Shinoda, E., 2001, “Particle Separation by Iinoya’s Type Gas Cyclone,” Powder Technol., 118, pp. 16–23.
14 Montavon, C. A., Grotjans, H., Hamill, I. S., Phillips, H. W., and Jones, I. P., 2000, “Mathematical Modelling and Experimental Validation of Flow in a Cyclone,” 5th International Conference on Cyclone Technologies, Warwick,
UK, 31 May–2 June, 2000; BHR Group, pp. 175–186.
15 Schmidt, S., and Blackburn, H. M., 2003, “Simulation of Turbulent Flow in a Cyclonic Separator,” Third International Conference on CFD in the Minerals and Process Industries, Melbourne, Australia, Dec. 10–12 2003; CSIRO, pp. 365–369.
16 Wang, B., Xu, L. X., Xiao, G. X., Chu, K. W., and Yu, A. B., 2003, “Numerical Study of Gas-Solid Flow in a Cyclone Separator,” Third International Conference on CFD in the Minerals and Process Industries, Melbourne, Australia,
Dec. 10–12 2003; CSIRO, pp. 371–376.
17 Derksen, J. J., 2003, “Separation Performance Predictions of a Stairmand High-Efficiency Cyclone,” AIChE J., 49, pp. 1359–1371.
18 Derksen, J. J., and Van den Akker, H. E. A., 2000, “Simulation of Vortex Core Precession in a Reverse-Flow Cyclone,” AIChE J., 46, pp. 1317–1331.
19 Witt, P. J., and Mittoni, L. J., 1999, “Validation of a CFD Model for Predicting Gas Flow in a Cyclone,” CHEMECA99, Newcastle, Australia, Dec. 26–29.
20 Shepherd, C. B., and Lapple, C. E., 1940, “Flow Pattern and Pressure Drop in a Cyclone Dust Collector,” Ind. Eng. Chem., 31, pp. 1246–1248.
21 Stairmand, C. J., 1949, “Pressure Drop in a Cyclone Separator,” Engineering London, 168, pp. 408–413.
22 ANSYS, 2004, “Turbulence and Wall Function Theory” and “Initial Condition Modeling,” In CFX-5. Solver theory, ANSYS, Canada Ltd., Waterloo." name="eprints.referencetext" />
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    <h1 class="ep_tm_pagetitle">Numerical and experimental studies of the flow field in a cyclone dryer</h1>
    <p style="margin-bottom: 1em" class="not_ep_block"><span class="person_name">Bunyawanichakul, Pracha</span> and <span class="person_name">Kirkpatrick, Michael P.</span> and <span class="person_name">Sargison, Jane E.</span> and <span class="person_name">Walker, Greg J.</span> (2006) <xhtml:em>Numerical and experimental studies of the flow field in a cyclone dryer.</xhtml:em> Journal of Fluids Engineering, 128 (6). pp. 1240-1250.</p><p style="margin-bottom: 1em" class="not_ep_block"></p><table style="margin-bottom: 1em" class="not_ep_block"><tr><td valign="top" style="text-align:center"><a href="http://eprints.utas.edu.au/2256/1/JFE__Rice_Dryer.pdf"><img alt="[img]" src="http://eprints.utas.edu.au/style/images/fileicons/application_pdf.png" class="ep_doc_icon" border="0" /></a></td><td valign="top"><a href="http://eprints.utas.edu.au/2256/1/JFE__Rice_Dryer.pdf"><span class="ep_document_citation">PDF</span></a> - Full text restricted - Requires a PDF viewer<br />655Kb</td><td><form method="get" accept-charset="utf-8" action="http://eprints.utas.edu.au/cgi/request_doc"><input accept-charset="utf-8" value="2838" name="docid" type="hidden" /><div class=""><input value="Request a copy" name="_action_null" class="ep_form_action_button" onclick="return EPJS_button_pushed( '_action_null' )" type="submit" /> </div></form></td></tr></table><p style="margin-bottom: 1em" class="not_ep_block">Official URL: <a href="http://dx.doi.org/10.1115/1.2354523">http://dx.doi.org/10.1115/1.2354523</a></p><div class="not_ep_block"><h2>Abstract</h2><p style="padding-bottom: 16px; text-align: left; margin: 1em auto 0em auto">The performance of a newly developed cyclone dryer is investigated using RANS-based single-phase computational fluid dynamics (CFD) and experimental model studies. The&#13;
cyclone dryer is a cylindrical tower, divided by conical orifices into several chambers; recirculation of the flow within individual chambers ensures adequate retention time for drying of the transported solid material. Numerical calculations are performed using the commercial CFD code CFX5.7 for different mesh types, turbulence models, advection schemes, and mesh resolution. Results of the simulation are compared with data from experimental model studies. The RNG k- turbulence model with hexahedral mesh gives satisfactory results. A significant improvement in CFD prediction is obtained when using a second order accurate advection scheme. Useful descriptions of the axial and tangential velocity distributions are obtained, and the pressure drop across the cyclone dryer chamber is predicted with an error of approximately 10%. The optimized numerical&#13;
model is used to predict the influence of orifice diameter and chamber height on total pressure drop coefficient.</p></div><table style="margin-bottom: 1em" cellpadding="3" class="not_ep_block" border="0"><tr><th valign="top" class="ep_row">Item Type:</th><td valign="top" class="ep_row">Article</td></tr><tr><th valign="top" class="ep_row">Additional Information:</th><td valign="top" class="ep_row">http://asmedl.aip.org/dbt/dbt.jsp?KEY=JFEGA4&amp;Volume=128&amp;Issue=6</td></tr><tr><th valign="top" class="ep_row">Keywords:</th><td valign="top" class="ep_row">cyclone dryer, numerical simulation, computational fluid dynamics, experimental&#13;
measurement, axial velocity distribution, tangential velocity distribution, pressure&#13;
drop coefficient</td></tr><tr><th valign="top" class="ep_row">Subjects:</th><td valign="top" class="ep_row"><a href="http://eprints.utas.edu.au/view/subjects/290501.html">290000 Engineering and Technology &gt; 290500 Mechanical and Industrial Engineering &gt; 290501 Mechanical Engineering</a></td></tr><tr><th valign="top" class="ep_row">ID Code:</th><td valign="top" class="ep_row">2256</td></tr><tr><th valign="top" class="ep_row">Deposited By:</th><td valign="top" class="ep_row"><span class="ep_name_citation"><span class="person_name">Dr Jane Sargison</span></span></td></tr><tr><th valign="top" class="ep_row">Deposited On:</th><td valign="top" class="ep_row">22 Oct 2007 23:41</td></tr><tr><th valign="top" class="ep_row">Last Modified:</th><td valign="top" class="ep_row">09 Jan 2008 02:30</td></tr><tr><th valign="top" class="ep_row">ePrint Statistics:</th><td valign="top" class="ep_row"><a target="ePrintStats" href="/es/index.php?action=show_detail_eprint;id=2256;">View statistics for this ePrint</a></td></tr></table><p align="right">Repository Staff Only: <a href="http://eprints.utas.edu.au/cgi/users/home?screen=EPrint::View&amp;eprintid=2256">item control page</a></p>
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