Entrainment models and their application to jets in turbulent cross flow
學年 74
學期 1
出版（發表）日期 1985-09-01
作品名稱 Entrainment models and their application to jets in turbulent cross flow
作品名稱（其他語言）
著者 Chiang, Hsu-cherng; Sill, Ben L.
單位 淡江大學水資源及環境工程學系
出版者 Kidlington: Pergamon
著錄名稱、卷期、頁數 Atmospheric Environment 19(9), pp.1425-1438
摘要 In this study, simple flows, such as buoyant jet and line thermal discharged into a still, uniform environment, are modelled mathematically by using integral equations of mass, momentum and thermal energy conversation. The governing equations are solved for entrainment rate by using an assumed growth rate model, the coefficients of which are fixed empirically. Entrainment models obtained by this method predict just as well as do models developed by other researchers who used different approaches. Our entrainment models are then applied to the problem of a turbulent jet discharged into a turbulent cross flow including both the near, intermediate, and far fields in a single model. It is assumed that the entrainment rate for this case can be obtained as a sum of terms representing near field entrainment of a buoyant jet and a line thermal, and far field mixing due to ambient turbulence. The predicted trajectories, velocities, and dilution rates agree satisfactorily with experimental results. In this study, simple flows, such as buoyant jet and line thermal discharged into a still, uniform environment, are modelled mathematically by using integral equations of mass, momentum and thermal energy conservation. The governing equations are solved for entrainment rate by using an assumed growth rate model, the coefficients of which are fixed empirically. Entrainment models obtained by this method predict just as well as do models developed by other researchers who used different approaches. Our entrainment models are then applied to the problem of a turbulent jet discharged into a turbulent cross flow including both the near, intermediate, and far fields in a single model. It is assumed that the entrainment rate for this case can be obtained as a sum of terms representing near field entrainment of a buoyant jet and a line thermal, and far field mixing due to ambient turbulence. The predicted trajectories, velocities, and dilution rates agree satisfactorily with experimental results.
關鍵字
語言 en
ISSN 1352-2310
期刊性質 國外
收錄於
產學合作
通訊作者 Sill, Ben L.
審稿制度
國別 GBR
公開徵稿
出版型式 紙本
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