Experimental and numerical modeling of the gas atomization nozzle for gas flow behavior

被引：53

作者：

Aydin, Ozer ^{[1
]}

Unal, Rahmi ^{[1
]}

机构：

[1] Dumlupinar Univ, Dept Mech Engn, Kutahya, Turkey

来源：

COMPUTERS & FLUIDS | 2011年 / 42卷 / 01期

关键词：

Gas atomization; CFD; Flow separation; Melt tip pressure; POWDER PRODUCTION; FLUID-DYNAMICS;

D O I：

10.1016/j.compfluid.2010.10.013

中图分类号：

TP39 [计算机的应用];

学科分类号：

081203 ; 0835 ;

摘要：

Gas atomization is a widely used process for manufacturing of fine metal- and alloy-powder. To ensure a stable process with high yields of metal powder, the negative pressure at the melt delivery tube tip base and no flow separation conditions are necessary for a good atomization process. An important feature of these jets is that flow separation may occur over the outer surface of the liquid delivery tube for some conditions. Flow separation cause solidification and accumulation of metal, leading to a shape alteration of the liquid delivery tube in gas atomization process. Using computational fluid dynamics (CFD) software, a parametric study was conducted to determine the effects of atomizing gas pressure on the melt delivery tube tip base pressure and flow separation. Atomization gas pressures of 1.0, 1.3, 1.7, 2.2, and 2.7 MPa were used in the CFD model to initialize the pressure in gas inlet. CFD simulations were performed and the modeling results were compared with experimental data. These results showed that the CFD modeling can be used for the estimation of the melt tip base pressure of the nozzle. It is found that the flow separation formation is strongly dependent on the atomizing gas pressure. (C) 2010 Elsevier Ltd. All rights reserved.

引用

页码：37 / 43

页数：7

共 17 条

[1]

[Anonymous], 2003, FLUENT 6 1 US GUID

[2]

ESPINA PI, 1998, P FEDSM 98 1998 ASME

[3]

*FLUENT INC, 2002, GAMBIT US GUID

[4]

Lang M, 2004, EXP FLUIDS, V36, P43, DOI [10.1007/S00348-003-0625-X, 10.1007/s00348-003-0625-x]

[5]

MULLIS AM, 2006, 3 INT C SPRAY DEP ME

[6]

*NAT I STAND TECHN, NIST REF FLUID THERM

[7] A computational fluid dynamics (CFD) investigation of the wake closure phenomenon [J].

Ting, J ;

Anderson, IE .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 379 (1-2) :264-276

[8] Modeling the in-flight events during metal spray forming [J].

Tinoco, J ;

Widell, B ;

Fredriksson, H ;

Fuchs, L .

MATERIALS SCIENCE AND ENGINEERING A-STRUCTURAL MATERIALS PROPERTIES MICROSTRUCTURE AND PROCESSING, 2004, 365 (1-2) :302-310

[9] Direct numerical simulation of melt-gas hydrodynamic interactions during the early stage of atomisation of liquid intermetallic [J].

Tong, Mingming ;

Browne, David J. .

JOURNAL OF MATERIALS PROCESSING TECHNOLOGY, 2008, 202 (1-3) :419-427

[10] Modelling compressible gas flow near the nozzle of a gas atomiser using a new unified model [J].

Tong, Mingming ;

Browne, David J. .

COMPUTERS & FLUIDS, 2009, 38 (06) :1183-1190

← 1 2 →