velocity gradient

Results showed that growth velocity decreased gradually and temperature gradient in crystal/ melt and the convexity ratio of solid-liquid interface increased followed by the increase of heat dissipation ability of the thermal exchanger.

结果表明：随热交换器散热能力的增加，晶体生长速率逐渐减小，晶体/熔体中温度梯度、固液界面凸出率随之增大。

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Influence of the characteristics of air supply terminal devices on velocity field and temperature gradient in occupied zone with displacement ventilation

末端装置特性对置换通风工作区速度场与温度梯度的影响

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Near the head of the fish back and the fish bones, the velocity changes greatly with large velocity gradient.

脊坝及刺坝坝头处流速变化剧烈，形成较大的流速梯度；

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With color-coded M-mode TDI, the endocardial 、 epicardial velocities and the myocardial velocity gradient ( MVG) were calculated within posterior wall from left ventricular long-axis view.

a）组织多普勒检查：M型彩色多普勒测量左室长轴切面T波顶点时左室后壁（心内膜、心外膜）的心肌运动速度（Vendo、Vpi）、心肌运动速度跨壁梯度（MVGm）；

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Thus the difficulties of discontinuous velocity gradient and the stress singularity at the exit point are avoided, and the expense of computation is reduced.

这样回避了速度梯度间断的困难，缓和了出口处应力奇性引起的矛盾，同时又减少了计算量。

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Combining depth-averaged numerical seepage flow model and 2-dimensional profile seepage flow model, seepage rate, seepage velocity field and hydraulic gradient of seepage control work in left abutment of Shawan hydropower station have been obtained.

采用深度平均渗流模型结合2维立面渗流模型，对沙湾水电站左岸坝肩“地窗式”防渗方案进行了渗流量、渗流场及渗透坡降的计算；

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The analysis of velocity gradient equation in three dimensional flow

三元流场中速度梯度方程的分析

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Experimental results indicate that this method can eliminate the Doppler ambiguity spectrum produced by turbulence, transit time effect, velocity gradient in sample volume and correlation of the scatterers in dual sample volume and measure turbulence flow unambiguously.

实验结果表明，该方法可消除湍流、渡越时间效应、采样单元内流速梯度和双采样单元内散射粒子互相关性等因素造成的湍谱模糊，实现无模糊湍流测量。

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From the distribution of velocity, a great velocity gradient can be seen in the zone with 2 D distance to the wall. The phenomenon was due to the boundary flow and reverse flow near the wall.

冲击射流近壁处存在着回流现象，由于边界层流动和近壁回流引起距离固壁2D内的速度梯度变化较大。

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[ 7] has made some estimates of this term, in this paper, according to the equations for velocity fluctuation, the pressure fluctuation Is solved so that the average value of the product of the pressure fluctuation and the velocity fluctuation gradient is obtained.

本文根据脉动速度所满足的方程解出脉动压力，然后进而求出脉动压力乘上脉动速度变形的平均值，得到了脉动压力脉动速度变形平均项的完整表达式。

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The results showed that the velocity gradient decreased at the region near the wall and the thermal boundary layer increased evidently with the injection of the coolant.

研究表明：发汗冷却减小了壁面处的速度梯度，使下壁面边界层明显增厚；随着冷却流体的注入，壁面处的湍流应力明显增大；

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In the CGT region, the relation between turbulent Reynolds stress and mean velocity gradient is nonlinear.

CGT区域内雷诺应力与平均速度梯度呈非线性关系.

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It is demonstrated that the accuracy of the approximate approach is acceptable in engineering, provided that the time averaged velocity gradient be determined by using the proper models.

结果表明，若选择适当的湍流时均速度梯度模型，用近似算法计算的体均能量耗散率与用解析式计算的值接近，说明该近似算法的准确性可以满足工程计算的需要。

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Crystal growth velocity increased gradually followed by the decrease of heating temperature. When heating temperature was closer to crystallization temperature, rate of change of crystal growth velocity was more drastic, temperature gradient and the convexity ratio of solid-liquid interface decreased.

随加热温度的降低，晶体生长速率逐渐增大，加热温度愈接近结晶温度，晶体生长速率变化率就愈剧烈；界面凸出率及晶体/熔体中温度梯度随之减小。

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Ray tracing with constant velocity gradient and inversion of 2-D interval velocity

常速度梯度射线追踪与二维层速度反演

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Objective To analyze the clinical value of peak myocardial velocity gradient ( MVG) as a noninvasive indicator of left ventricular ( LV) systolic or diastolic function.

目的探讨心肌速率阶差MVG评价左室舒缩功能的价值。

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In the duration of deep bed filtration the void ratio of sediment will be varied with the average flow velocity gradient.

过滤过程滤层中沉积物的空隙率随水流平均速度梯度的改变而变化。

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The air permeation velocity and pressure gradient curve in the soil show clearly in step-phase.

气体渗透速度与外界所施加的“压力平方差梯度”之间存在明显的分段特征.

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Application of theory of boundary velocity gradient in design of orifice

边界速度梯度理论在火孔设计中的应用

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