等离子喷涂中过热度对熔滴扁平化行为的影响
|
摘要
根据Rajeev Dhiman等人提出的凝固参数公式,结合氧化钇部分稳定的二氧化锆(YSZ)熔滴存在一定过热度的特点,对凝固参数公式进行修正。采用FLUENT软件对YSZ熔滴在不同的入射速度和过热度条件下进行模拟,研究了过热度和入射速度对扁平粒子最终形貌的影响。结果表明:对于一定状态的熔融液滴,存在一个临界曲线。在该临界曲线内,熔滴铺展为质量较高的盘状。对于特定状态的熔滴,通过减小入射速度或降低过热度,可使扁平粒子的形状可控。
According to the solidification parameters equation proposed by R Dhiman et al, the formula of solidification parameters was amended by combining the characteristic of molten yttria-stabilized zirconia(YSZ) droplet with certain overheating degree. The effects of overheating degree and impact velocity on the final morphology of flat particles were researched by simulating YSZ droplet under different impact velocity and overheating degree by FLUENT software. The results show that as for molten droplet in a certain state, there is a transition curve. The molten drop spreads out into disk with better quality. For droplet in certain state, the shape of the flat particle can be controlled by decreasing the impact velocity or the overheating degree.
According to the solidification parameters equation proposed by R Dhiman et al, the formula of solidification parameters was amended by combining the characteristic of molten yttria-stabilized zirconia(YSZ) droplet with certain overheating degree. The effects of overheating degree and impact velocity on the final morphology of flat particles were researched by simulating YSZ droplet under different impact velocity and overheating degree by FLUENT software. The results show that as for molten droplet in a certain state, there is a transition curve. The molten drop spreads out into disk with better quality. For droplet in certain state, the shape of the flat particle can be controlled by decreasing the impact velocity or the overheating degree.
引文
[1]Tanaka Y, Fukumoto M.Investigation of dominating factors on flattening behavior of plasma sprayed ceramic particles[J].Surface and Coatings Technology,1999,120-121:124-130.
[2]Chandra S, Fauchais P.Formation of solid splats during thermal spray deposition[J].J Therm Spray Technol,2009,18(2):148-180.
[3]Wei G, Zheng L, Zhao C, et al.Thermal behaviors of droplet-substrate in thehrmal spray new applications[J].Begel House Inc,2014(5):89-99.
[4]陈丹,王玉,白宇,等.等离子喷涂中雷诺数对熔滴扁平化行为的影响[J].无机材料学报,2014,30(1):65-70.
[5]Kharas B, Wei G, Sampath S, et al.Morphology and microstru cture of thermal plasma sprayed silicon splats and coatings[J].Surface and Coatings Technology,2006,201(3/4):1454-1463.
[6]Dhiman R, Mcdonald A G, Chandra S.Predicting splat morphology in a thermal spray process[J].Surface and Coatings Technology,2007,201(18):7789-7801.
[7]Xiong H B, Zheng L L, Li L, et al.Melting and oxidation behavior of in-flight particles in plasma spray process[J].International Journal of Heat and Mass Transfer,2005,48(25/26):5121-5133.
[8]Bertagnolli M, Marchese M, Jacucci G.Modeling of particles impacting on a rigid substrate under plasma spraying conditions[J].J Therm Spray Technol,1995,4(1):41-9.
[9]Scardovelli R, Zaleski S.Direct numerical simulation of free-surface and interfacial flow[J].Annual Review of Fluid Mechanics,1999,31:567-603.
[10]Gueyffier D, Li J, Nadim A, et al.Volume-of-fluid interface tracking with smoothed surface stress methods for three-dimensional flows[J].Journal of Computational Physics,1999,152(2):423-456.
[11]Fedorchenko A I, Wang A B, Wang Y H.Effect of capillary and viscous forces on spreading of a liquid drop impinging on a solid surface[J].Physics of Fluids,2005,17(9):1-8.
[12]Poirier D R, Poirier E J.Heat transfer fundamentals for metal casting[M].UK:Minerals,Metals and Materials Society Press,1994.
[13]Aziz S D, Chandra S.Impact,recoil and splashing of molten metal droplets[J].International Journal of Heat and Mass Transfer,2000,43(16):2841-2857.
[14]Shakeri S, Chandra S.Splashing of molten tin droplets on a rough steel surface[J].International Journal of Heat and Mass Transfer,2002,45(23):4561-4575.
[15]PAsandideh M, Qiao Y M, Chandra S, et al.Capillary effects during droplet impact on a solid surface[J].Physics of Fluids,1996,8(3):650-659.
[16]Wan Y P, Zhang H, Jiang X Y, et al.Role of solidification,substrate temperature and reynolds number of droplet spreading in thermal spray deposition:Measurements and modeling[J].Journal of Heat Transfer,2001,123(2):382-389.
[2]Chandra S, Fauchais P.Formation of solid splats during thermal spray deposition[J].J Therm Spray Technol,2009,18(2):148-180.
[3]Wei G, Zheng L, Zhao C, et al.Thermal behaviors of droplet-substrate in thehrmal spray new applications[J].Begel House Inc,2014(5):89-99.
[4]陈丹,王玉,白宇,等.等离子喷涂中雷诺数对熔滴扁平化行为的影响[J].无机材料学报,2014,30(1):65-70.
[5]Kharas B, Wei G, Sampath S, et al.Morphology and microstru cture of thermal plasma sprayed silicon splats and coatings[J].Surface and Coatings Technology,2006,201(3/4):1454-1463.
[6]Dhiman R, Mcdonald A G, Chandra S.Predicting splat morphology in a thermal spray process[J].Surface and Coatings Technology,2007,201(18):7789-7801.
[7]Xiong H B, Zheng L L, Li L, et al.Melting and oxidation behavior of in-flight particles in plasma spray process[J].International Journal of Heat and Mass Transfer,2005,48(25/26):5121-5133.
[8]Bertagnolli M, Marchese M, Jacucci G.Modeling of particles impacting on a rigid substrate under plasma spraying conditions[J].J Therm Spray Technol,1995,4(1):41-9.
[9]Scardovelli R, Zaleski S.Direct numerical simulation of free-surface and interfacial flow[J].Annual Review of Fluid Mechanics,1999,31:567-603.
[10]Gueyffier D, Li J, Nadim A, et al.Volume-of-fluid interface tracking with smoothed surface stress methods for three-dimensional flows[J].Journal of Computational Physics,1999,152(2):423-456.
[11]Fedorchenko A I, Wang A B, Wang Y H.Effect of capillary and viscous forces on spreading of a liquid drop impinging on a solid surface[J].Physics of Fluids,2005,17(9):1-8.
[12]Poirier D R, Poirier E J.Heat transfer fundamentals for metal casting[M].UK:Minerals,Metals and Materials Society Press,1994.
[13]Aziz S D, Chandra S.Impact,recoil and splashing of molten metal droplets[J].International Journal of Heat and Mass Transfer,2000,43(16):2841-2857.
[14]Shakeri S, Chandra S.Splashing of molten tin droplets on a rough steel surface[J].International Journal of Heat and Mass Transfer,2002,45(23):4561-4575.
[15]PAsandideh M, Qiao Y M, Chandra S, et al.Capillary effects during droplet impact on a solid surface[J].Physics of Fluids,1996,8(3):650-659.
[16]Wan Y P, Zhang H, Jiang X Y, et al.Role of solidification,substrate temperature and reynolds number of droplet spreading in thermal spray deposition:Measurements and modeling[J].Journal of Heat Transfer,2001,123(2):382-389.