velocity gradient 中文意思是什麼
velocity gradient
解釋
波速梯度-
Biogas in commercial size existed in sedimentary basin which has high deposition velocity and low geothermal gradient and shale, coalbed or compacted sandstone in unconventional environments
商業規模的生物氣存在於具有高沉積速率、低地溫梯度的沉積盆地中和非常規環境下形成的頁巖、煤層或緻密砂巖中。 -
Compared with the pressure hydrophone, vector transducer can provide both the information about pressure ( scalar quantity ) and particle velocity ( vector quantity ) of the sound field, which offers more possibilities for signal processing. so vector transducer and its signal processing have attracted the attention of researchers both native and foreign. in this thesis, a method of correlation equations for pressure gradient transducer is presented, and the estimation of multi - signal parameters with single vector transducer is given
與傳統的聲壓水聽器相比，矢量水聽器既能獲得聲場中的聲壓這一標量信息，又能獲得聲場中質點振速這一矢量信息，這為其信號處理帶來更大的空間，因此矢量水聽器及其相應的聯合信息處理技術日益成為國內外科技工作者們研究的熱點。 -
By performing fourier transformation, the relationship between the turbulent intensity of the particle and that of the carrier fluid was obtained which makes clear that particle size, specific gravity, velocity gradient, and the characteristic frequency of energy - containing eddies are four basic influencing parameters. it is proven theoretically that under certain conditions, the stream - wise and transverse particle turbulent intensities exceed those of the carrier fluid. based on the equations of two - phase flow, the presence of fine sediment suspension is shown to attenuate the turbulent intensity of the water
通過對細小顆粒在剪切流場中運動方程的fourier分析，得到了顆粒脈動強度和流體脈動強度之間的定量關系，表明顆粒粒徑、顆粒密度、流速梯度以及紊動場含能旋渦的特徵頻率是影響顆粒脈動強度的主要因素，首次從理論上證明了在一定條件下，顆粒在縱、垂向的脈動強度均會超過相應的流體脈動強度，為已有的實測資料提供了合理的解釋。 -
If increasing drawing interval, the movement and flow range of top coal will enlarge, and the velocity gradient on flow cross - section will diminish, so that it is good for controlling the flow rate of thin sand among loose top coal
研究表明，加大放煤步距，頂煤運移流動的范圍變大，流動斷面內速度梯度變小，有利於控制細砂的下竄速度。 -
According to the working modes of mr devices, combining the ohm ' s law of magnetic circuit and the design theory of non - steady magnetic circuit, magnetic structures of the automotive damper have been worked out. to emulate the performance of conventional shock absorber, two automotive mr dampers were designed and fabricated at chongqing university. an applied magnetic field increase the yield stress of mr fluids in flow annular passages, which alters the velocity profile of mr fluid in the passages and raise the pressure gradient between low cavity and high one at some given flow rates
根據磁流變阻尼器工作模式，利用磁路中的歐姆定律和動態磁路設計原理，結合汽車懸架的技術要求和結構特點，提出了基於剪切模式和流動模式共同作用（混合工作模式）的汽車磁流變阻尼器設計原理，討論了阻尼器動態磁路設計中的若干技術問題；根據流體力學navier - stokes方程，分別利用newton流體特性和bingham流體特性，推導了基於平板模型和軸對稱模型的流變學方程，得出了阻尼器阻尼力的計算方法。 -
On the basis of published research of experts and scholars, relations among the velocity of water, that of solid particles and that of settling slurry have been established by the analysis of momentum transmission between water and solid particles in the upward inclined pipeline. then the calculation formulae for the upward - inclined - pipe hydraulic gradient are derived
本文在系統總結現有專家學者的研究成果基礎之上，通過分析向上傾斜管道輸送中清水與固體顆粒的動量傳遞過程，從動量守恆的角度建立了清水速度、固體顆粒速度和漿體流速之間的關系，進而推導出了向上傾斜管道輸送的水力坡度計算公式。 -
2 ). it has a great temperature gradient along the height in hot and cold plenums of cefr in steady state. the buoyancy force cannot be ignored because the flow velocity is low in the whole flow regions
冷熱鈉池在穩態工況下沿高度方向有很大的溫度梯度，整個流動區域內的流速較低，浮升力的影響不可忽略； 3 -
Normal - mode attenuation coefficients for shallow water with negative sound velocity gradient and sandy or muddy sediment bottom
質海底的負聲速梯度淺海中簡正波的衰減系數 -
Based on the nonlinear relationship of permeability velocity and hydraulic gradient, four non - darcy seepage models were summarized to investigate the permeability behavior of soft soil under consolidation pressure
摘要針對傳統固結理論不能考慮非達西滲流的不足，研究了滲流速度與水力梯度的非線性關系。 -
With the same slope gradient and slope length, the soil erosion on the dyke slope caused by the runoff mainly depended on the factors such as the runoff, flow velocity, rainfall intensity, rainfall duration, as well as the up - slope drainage area of dyke slope
坡度、坡長一定時，徑流對戧坡的侵蝕主要與徑流量、流速、雨強、降雨歷時，戧坡以上匯聚水量或集水面積有關。 -
( 2 ) a series of experiments on time scale distortion are made with real river model, inflow and outflow boundary condition, and continuous simulation. by means of analysis of the experimental data on model water level, water - surface gradient, cross velocity, outflow discharge process and the sediment transportation capacity, the main physical reasons for the above hydraulic parameters deviations caused by time scale distortion are illustrated : response delay of model channel storage capacity and rate of water level with time
（ 2 ）採用真實的河工模型和入出流邊界控制條件以及連續模擬的方法進行了有關時間變態率的系列試驗，通過模型水位、比降、流速、出口流量過程線和斷面挾沙力試驗資料的分析，闡明了時間變態引起上述各種水力參數偏離的主要物理原因：模型的槽蓄響應和洪水過程時間變化率的響應滯后。 -
Analysis of two typical sorts of velocity gradient equations about s
2流面的兩類典型梯度方程的分析 -
Compare the measured velocity profile and analytical solution of poisoeullie flow shows a good agreement within the most part of the measured region, while the value of the former is higher near the wall resulting from the combined effects of strong flare light and velocity gradient polarization
把獲得的測量結果和解析解的泊肅葉流動速度廓線進行比較后發現，在從流動中心到近壁面的大部分區域，兩者吻合良好，在近壁面區域，由於示蹤粒子和壁面碰撞以及壁面反射光等原因，測量值大於解析解。 -
The maim factors affecting the velocity profiles are the viscosity near the bed, particle grid resistance and the density gradient
影響流速分佈的主要因素有底部粘度、顆粒格柵阻尼和密度梯度。 -
Experiment data is analyzed with method of projection pursuit for more reliability and utility value. this paper first systematically studied energy dissipater of suspension girder in steep gradient with supercritical flow according to used in actual engineering and received perfect effect. experimental studies about the distribution velocity, the variation of water surface and pressure are undertaken
然而，文章主要針對已獲國家自然科學基金資助，且已在實際工程實踐中產生了良好消能效果的陡坡急流懸柵消能工的部分試驗成果，進行了較全面深入地討論，即具體根據試驗資料系統分析了懸柵陡槽內泄水時的流速分佈、底板壓力分佈及水面線變化情況。 -
If the two - equation turbulence models employ a linear relationship between the reynolds stress and the mean strain - rate tensors, this relationship is known as the generalized boussinesq model, the two - equation models can be extended for a wider range of applicability by developing more advanced nonlinear algebraic relations between the stress tensor and the mean - velocity gradient and the turbulent scales, this is known as explicit algebraic stress models ( easm )
另一個是構成模型，即決定應力張量、應變率張量和兩個湍流尺度因子之間的函數關系式，它決定了雷諾應力。如果構成模型是線性的，則為boussinesq渦粘模型（ evm ） ，如果構成模型是非線性的代數關系式，則為顯式代數應力模型（ easm ） 。 -
Oil. it pours very slowly compared with water. it takes a greater force to stir the oil, indicating a higher shearing stress for a given velocity gradient
4如果需要較高的動力黏度時，是選擇冷的潤滑油或新鮮的水，為什麼 -
The ratio of the magnitude of an applied shear stress to the velocity gradient that it produces ; that is, a measure of a noncrystalline material ' s resistance to permanent deformation
剪切應力數值與其產生應變速率的比值叫粘性，用來衡量非晶材料抵抗永久變形的能力。 -
In the near bed region, the turbulent intensities are elevated above those of water at a rate proportional to particle size due to collisions and velocity gradient
床面附近，顆粒脈動強度大於流體的脈動強度，且粒徑越大，脈動強度越大。 -
Therefore, we can conclude that the velocity gradient of fluid around a fiber is the key for its rotation
於是得出結論：纖維附近流體的速度梯度是導致纖維旋轉的主要因素。
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