EFFECT OF OSCILLATORY FLOW ON THE MIXING PERFORMANCE OF TURBULENT OPPOSING JETS
Publish place: The First Middle East Drying Conference
Publish Year: 1390
نوع سند: مقاله کنفرانسی
زبان: English
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شناسه ملی سند علمی:
MEDC01_007
تاریخ نمایه سازی: 11 شهریور 1391
Abstract:
The confined opposed-jet configuration of simple geometry and well-defined boundaries has several favorable heat and mass transfer features that can be exploited in novel dryer designs for particulate materials and sludges that can be dispersed in a gas steam. Prior work has considered stead jets impinging normally against each other. Here, we consider confined opposing jets which are two dimensional and in the turbulent flow regime. The periodic oscillations induced by pulsation show features such as flow instability, higher turbulence levels, chaotic mixing and a nonlinear dynamic response of the boundary layers. Thus, the potential advantages of pulsing one or both jets are evaluated using the computational fluid dynamic approach, where RNG k-ε turbulence model is used. The jet Reynolds numbers vary from 5,000 to 20,000, while the frequency and amplitude of oscillation of the jet range from 10 Hz and 20% to 200 Hz and 80%. Parametric studies are conducted for the optimization of unsteady turbulent opposed jets. The hydrodynamics characteristics are examined to better understand the mixing properties in unsteady turbulent opposed jets.
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Authors
XU Peng
College of Science, China Jiliang University ۲۵۸ Xueyuan Street, Xiasha Higher Education District, Hangzhou, ۳۱۰۰۱۸, China
QIU Shuxia
College of Science, China Jiliang University ۲۵۸ Xueyuan Street, Xiasha Higher Education District, Hangzhou, ۳۱۰۰۱۸, China
MUJUMDAR Arun S
Department of Mechanical Engineering, National University of Singapore ۹ Engineering Derive ۱, ۱۱۷۵۷۶, Singapore
PANG Ning
Department of Mechanical Engineering, National University of Singapore ۹ Engineering Derive ۱, ۱۱۷۵۷۶, Singapore
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