YU Yang1**, WU Qun1, WANG Xue-Wei1, YANG Xiao-Bin2
1Biomechanics and Biomaterials Laboratory, Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081 2School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083
Wetting Behavior between Droplets and Dust
YU Yang1**, WU Qun1, WANG Xue-Wei1, YANG Xiao-Bin2
1Biomechanics and Biomaterials Laboratory, Department of Mechanics, School of Aerospace Engineering, Beijing Institute of Technology, Beijing 100081 2School of Resource and Safety Engineering, China University of Mining and Technology (Beijing), Beijing 100083
摘要The wetting behavior of dust by droplets is investigated by experiments and numerical simulation methods. Experimental observation reveals that the surface of a coal slice is hydrophilic in nature, while surfaces of coal dust stacks are hydrophobic. We show that water droplets settle on these surfaces following the Cassie–Baxter wetting model, as supported by theoretical, numerical analyses and experimental observations, i.e. water droplets only wet the first layer of coal dust. Our numerical simulation results also show that a water droplet could not enclose any coal dust inside it and many coal dust particles are adhered with a hexagonal close packing on a large water droplet. Based on these results, we conclude that the surface area of water droplets is an important factor on their wetting and capturing coal dust, and producing smaller water droplets can improve the efficiency of settling dust.
Abstract：The wetting behavior of dust by droplets is investigated by experiments and numerical simulation methods. Experimental observation reveals that the surface of a coal slice is hydrophilic in nature, while surfaces of coal dust stacks are hydrophobic. We show that water droplets settle on these surfaces following the Cassie–Baxter wetting model, as supported by theoretical, numerical analyses and experimental observations, i.e. water droplets only wet the first layer of coal dust. Our numerical simulation results also show that a water droplet could not enclose any coal dust inside it and many coal dust particles are adhered with a hexagonal close packing on a large water droplet. Based on these results, we conclude that the surface area of water droplets is an important factor on their wetting and capturing coal dust, and producing smaller water droplets can improve the efficiency of settling dust.
YU Yang1**, WU Qun1, WANG Xue-Wei1, YANG Xiao-Bin2. Wetting Behavior between Droplets and Dust[J]. 中国物理快报, 2012, 29(2): 26802-026802.
YU Yang, WU Qun, WANG Xue-Wei, YANG Xiao-Bin. Wetting Behavior between Droplets and Dust. Chin. Phys. Lett., 2012, 29(2): 26802-026802.
[1] Feng T, Sun L and Zhang Y 2009 Energy Policy 37 5475
[2] Chang Y, Ries R J and Wang Y 2010 Energy Policy 38 6597
[3] Charinpanitkul T and Tanthapanichakoon W 2011 Separation and Purification Technology 77 382
[4] Gaunt L F, Hughes J F and Harrison N M 2003 J. Electrostatics 58 159
[5] Oleszczak P and Klemens R 2005 J. Loss Prevention in the Process Industries 19 187
[6] Young T 1805 Philos. Trans. R. Soc. London 95 65
[7] Wenzel R N 1936 Indust. Engin. Chem. 28 988
[8] Cassie A B D and Baxter S 1944 Trans. Faraday Soc. 40 546
[9] Liu J L, Feng X Q, Wang G and Yu S W 2007 J. Physics: Condensed Matter 19 356002
[10] Courbin L, Denieul E, Dressaire E, Roper M, Ajdari A and Stone H A 2007 Nature Mater. 6 661
[11] Xia D, He X, Jiang Y B, Lopez G P and Brueck S R J 2010 Langmuir 26 2700
[12] Daniel S, Chaudhury M K and De Gennes P G 2005 Langmuir 21 4240
[13] Ling W Y L, Ng T W and Neild A 2010 Langmuir 26 17695
[14] Brakke K 1992 Exp. Math. 1
[15] Aussillous P and Quere D 2001 Nature 411 924
[16] Kralchevsky P A, Paunov V N, Denkov N D, Lvanov I B and Nagayama K 1993 J. Colloid Interface Sci. 155 420
[17] Yu Y, Guo M, Li X D and Zheng Q S 2007 Langmuir 23 10546
[18] Yang L, Tu Y and Fang H 2010 Soft Matter 6 6178
[19] Nishino T, Meguro M, Nakamae K, Matsushita M and Ueda Y 1999 Langmuir 15 4321
[20] Furmidge C G L 1962 J. Colloid Sci. 17 309
[21] Yoshimitsu Z, Nakajima A, Watanabe T and Hashimoto K 2002 Langmuir 18 5818
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