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題名 | Velocity Measurements of Sheared Granular Flows=剪力粒子流之速度量測分析 |
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作者 | 蕭述三; 鄭晃華; | 書刊名 | 中國工程學刊 |
卷期 | 22:1 1999.01[民88.01] |
頁次 | 頁93-99 |
分類號 | 446.11 |
關鍵詞 | 剪力粒子流; 粒子溫度; 變動量; 剪力層; Sheared granular flow; Granular temperature; Fluctuation; Shear layer; |
語文 | 英文(English) |
中文摘要 | 本文以影像處理技術及粒子追�j法研究剪力粒子流之速度、變動速度及粒子溫度 分佈。實驗中分別將不同質量之玻璃顆粒體置於靜止上邊界及固定下邊界速度之剪力槽裝置 ,以觀測其流動。剪力槽內粒子流可分為低剪率區及高剪率區。低剪率區位於槽之下部,其 速度較大且速度較不隨著高度變化。槽內速度隨著高度增加而減小,而變動速度、粒子溫度 及剪率均隨著高度增加而增加。變動速度分佈為非等向性且流動方向之變動量大於垂直方向 。對於較大質量之試驗,其上層粒子滑移速度較大且低剪力層區較厚。 |
英文摘要 | The flow behaviors of granular materials in a shear cell were experimentally studied. Different masses of granular materials were put in an annular shear device with a stationary upper wall and a constantly rotated lower wall. The image processing technique and the particle tracking method were employed to measure average particle velocities and fluctuating velocities in the streamwise and transverse directions. The granular flows consisted of a low shear rate region with higher and more uniform velocities in the lower test section, and a high shear rate region in the upper part. The velocities decreased with the height, while the fluctuations, granular temperature and shear rate increased with the height. The velocity fluctuations were aninotropic and were greater in the streamwise direction. The slip velocity and the low shear layer thickness were greater for the case with greater total granular mass. |
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