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single size sand
相关语句
  均匀沙
     Threshold wind-velocity for single size sand
     对均匀沙流体起动风速的研究
短句来源
  相似匹配句对
     Threshold wind-velocity for single size sand
     对均匀沙流体起动风速的研究
短句来源
     ON CRYSTALLINE SIZE AND MICROSTRAIN WITH FOURIER' S SINGLE PEAK
     测微晶尺寸及微观应变的单峰傅氏分析法
短句来源
     Development of Big Size Molybdenum-Niobium Single Crystal
     大尺寸钼-铌合金单晶的研制
短句来源
     (3) The size of C.
     川鄂连蕊茶种群的生殖分配是地径大小的函数,拟合回归方程为:
短句来源
     from single to unity;
     从单一到统一;
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Based on analyzing the initiation process of mix-sized sand by wind, a theory for the wind threshold of mix-sized sand is presented, which reveals that the threshold velocity of a large diameter in mix-sized sand is less than the threshold velocity of single-size sand having the same diameter, but the case to a small diameter in mix-sized sand is just converse. Then, using the threshold theory of mix-sized sand, we depict the formation of a gravel surface and the...

Based on analyzing the initiation process of mix-sized sand by wind, a theory for the wind threshold of mix-sized sand is presented, which reveals that the threshold velocity of a large diameter in mix-sized sand is less than the threshold velocity of single-size sand having the same diameter, but the case to a small diameter in mix-sized sand is just converse. Then, using the threshold theory of mix-sized sand, we depict the formation of a gravel surface and the dynamical stabilization between turbulent wind and gravel surface.

定义了不均匀沙有别于均匀沙的起动概念,得出了不均匀沙中各粒径沙具有不同的流体起动风速,且不等于对应粒径均匀沙流体起动风速的结论,具体表现为:不均匀沙中小粒径沙的流体起动风速大于相同粒径均匀沙的流体起动风速,而其中大粒径沙的流体起动风速又小于相同粒径均匀沙的流体起动风速。然后应用不均匀沙起动风速理论,讨论了戈壁风蚀层与环境风力之间动态平衡的建立过程。

An improved theory is developed to illuminate distributing density of arbitrary shaped roughness elements on a wall and how wind velocity above the turbulent boundary layer in?uences shear velocity. The theory is used to study the threshold velocity of single size sand, and obtain that the threshold velocity represented by wind velocity above the turbulent boundary layer is proportional to the exponential function of sand distributing density when the threshold velocity represented by shear velocity...

An improved theory is developed to illuminate distributing density of arbitrary shaped roughness elements on a wall and how wind velocity above the turbulent boundary layer in?uences shear velocity. The theory is used to study the threshold velocity of single size sand, and obtain that the threshold velocity represented by wind velocity above the turbulent boundary layer is proportional to the exponential function of sand distributing density when the threshold velocity represented by shear velocity is proportional to the square root of sand distributing density. Let sand distributing density increase, the relationship will become the classical wind initiation formula of single size sand eventually.

从学术观点和方法上将研究边界层流动对粗糙壁面的摩擦切应力与研究均匀沙流体起动风速统一了起来;;既关心了布满均匀沙的沙床上颗粒的流体起动风;;又关心了稀疏分布着均匀颗粒的光滑地表上沙子的流体起动风速;;得出了用边界层外参考风速表示的流体起动风速随颗粒分布密度的增加呈指数增长规律;;而用摩阻流速表示的流体起动风速与颗粒分布密度的二分之一次方成正比的规律;;与有关实验数据取得一致.当颗粒的分布密度逐渐增大时;;本文得到的均匀沙流体起动风速公式最终退化为传统的均匀沙流体起动风速公式.

 
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