Effects of the nozzle contraction angle on particle flow behaviors in a gas-particle two-phase jet

Ba，Zhongren1,2; Zhao，Jiantao1; Hao，Zhenhua1; Li，Junguo3; Yang，Xin4; Xiao，Haicheng5; Fang，Yitian1

2022-07-01

10.1016/j.expthermflusci.2022.110624

EXPERIMENTAL THERMAL AND FLUID SCIENCE   影响因子和分区

0894-1777

1879-2286

The particle dynamics of a conical jet with different contraction angles (the cone angle of the contraction wall, α = 20°, 40°, 60°, 80°) were investigated using particle image velocimetry (PIV) and optical fiber probes. The axial and radial distributions of particle-phase velocity and concentration were measured within a confined chamber at the mass loading ratio m = 0.3–3.3 and jet Reynolds number Re = 11,843–104,497. Due to the nozzle contraction effect, the particle dynamics of conical jet are significant differences from the pipe jet and the smooth contraction jet. In the axial direction, there is a strong slip velocity between two phases near the nozzle exit (x/D = 0–6), which leads to the occurrence of particle acceleration. In the radial direction, the particles preferentially converge towards the centerline, forming the particle contraction, which intensifies the momentum transfer from the axial to radial direction and thus increases the particle dispersion. The particle acceleration and contraction are more pronounced with the increase of contraction angle. Furthermore, the order of the velocity decay rate and the spreading rate for different contraction angles are 40° > 80° > 60° > 20°. The nozzle contraction angle of 40° shows the best entrainment and mixing characteristics. In addition, the particles contraction near the nozzle exit as well as the particles accumulation in the wall region (r/R = 0.83–1.00) increase the non-uniformity of particle concentration.

Entrainment and mixing Gas-particle two-phase jet Nozzle contraction angle

SCI ; EI

英语

其他

Major science and technology projects of China National Petroleum Corporation[0] ; Key Research and Development Project of Shanxi Province[201903D121018] ; Major Special Projects of Science and Tech-nology in Shanxi Province[20201102006]

Thermodynamics ; Engineering ; Physics

Thermodynamics ; Engineering, Mechanical ; Physics, Fluids & Plasmas

WOS:000792719800005

ELSEVIER SCIENCE INC

20221111787069

Acceleration ; Nozzles ; Optical fibers ; Reynolds number ; Velocity measurement

Fluid Flow, General:631.1 ; Fiber Optics:741.1.2 ; Chemical Operations:802.3 ; Special Purpose Instruments:943.3

ENGINEERING

2-s2.0-85126084133

Scopus

1.State Key Laboratory of Coal Conversion,Institute of Coal Chemistry,Chinese Academy of Sciences,Taiyuan,Shanxi,030001,China
2.University of Chinese Academy of Sciences,Beijing,100049,China
3.Academy for Advanced Interdisciplinary Studies,Southern University of Science and Technology,Shenzhen,518055,China
4.Department of Engineering Science,University of Oxford,Oxford,UK,OX2 0ES,United Kingdom
5.Petrochemical Research Institute of Petrochina,China National Petroleum Corporation,Beijing,102206,China

Ba，Zhongren,Zhao，Jiantao,Hao，Zhenhua,et al. Effects of the nozzle contraction angle on particle flow behaviors in a gas-particle two-phase jet[J]. EXPERIMENTAL THERMAL AND FLUID SCIENCE,2022,135.

Ba，Zhongren.,Zhao，Jiantao.,Hao，Zhenhua.,Li，Junguo.,Yang，Xin.,...&Fang，Yitian.(2022).Effects of the nozzle contraction angle on particle flow behaviors in a gas-particle two-phase jet.EXPERIMENTAL THERMAL AND FLUID SCIENCE,135.

Ba，Zhongren,et al."Effects of the nozzle contraction angle on particle flow behaviors in a gas-particle two-phase jet".EXPERIMENTAL THERMAL AND FLUID SCIENCE 135(2022).