Influence of Convection on Diffusion Induced by Inlet Wind Velocity in a Tunnel
Diffusion and convection are related. This study demonstrated that only when convection is dominant which be influenced by the convection. This study shows that remains the same as inlet wind velocity which is < 0.02 m/sec. As the value exceeds this critical velocity, diffusion starts to be influenced by convection. As wind velocity increases, convection increase. And if inlet velocity is assumed >0.05 m/sec, convection increases. When PE number exceeds 1.05, convection becomes conducive to diffusion. Pulsating inlet flow markedly impact unless the frequency at which the flow pulsates increase. In this study, the frequency of wind pulsates once every 5-8 times, respectively, and the diffusion cloud is influenced by this frequency. The pulsating flow and non-uniform are conducted using (User’s-Defined Functions(UDFs)) that control flow and frequency. Keywords: .
CFD tunnel pollutant dispersion finite volume method numerical integral
Jia-Twu Lee Hsing-Nan Wu
Department of Environmental Engineering and Science ,National Pingtung University of Science and Technology
国际会议
西安
英文
476-488
2011-08-17（万方平台首次上网日期，不代表论文的发表时间）