Along with crystal growth, the axial temperature gradient at the interface of liquid-solid was reduced. 随着晶体的生长,固液界面的轴向温度梯度逐渐减小。
Using the system designed in this thesis work, flow field calibration of the wind tunnel is accomplished, which covers dynamic pressure drop coefficient, dynamic pressure time stability, axial static pressure gradient, boundary layer, and degree of turbulence, etc. 然后利用本文设计的系统完成了落差系数、动压时间稳定姓、轴向静压梯度、边界层及湍流度等内容的流场校测。
Results show that the axial index gradient can compensate the effect caused by radial index gradient in some cases. 结果表明,轴向折射率梯度在一定条件下可以补偿径向折射率梯度的影响。
Results show that the axial temperature gradient in the center of hi h frequency arc is lower than that of DC arc. 结果表明,高频电弧中心的轴向温度梯度低于直流电弧中心的轴向温度梯度。
The average growth rate of the SiC monocrystal increases with the seed temperature in the same axial temperature gradient according to the experiments. 通过实验发现:在相同的轴向温度梯度下,SiC晶体平均生长速率随籽晶温度的升高而变大。
When the axial pressure gradient is small enough or the torsion is sufficiently larger than the curvature, the location of the maximal axial velocity is near the inner bend. 当轴向压力梯度较小或挠率相对于曲率较大时,轴向速度最大值靠近内侧。
Analytical and experimental results show that the optical window thermo-optical errors are sensitive to the radial and circumferential temperature gradients and that the effects of the temperature drift and the axial temperature gradient can be neglected. 分析和试验结果表明:径向温差和周向温差对光学窗口的热光学误差影响较大,而轴向温差和温度水平变化的影响很小。
Thermal conditions forming channel segregation in a steel ingot depend not only on cooling rate but also on the ratio of axial temperature gradient, GA? to radial one, GR. 钢锭中形成沟槽偏析的传热条件不仅与凝固冷却速度有关,而且取决于轴向温度梯度GA与径向温度梯度GR之比。
Furthermore, the melt/ crystal interface becomes more convex toward the melt, and the axial temperature gradient in the crystal decreases with increasing of surface tension temperature coefficient. 但是,结晶界面更凸向熔体,在结晶界面处晶体内的轴向温度梯度减小;
The effects of the temperature gradient and pulling rate on the crystal growth, microstructure morphology and composition distribution were studied. The result shown that the positive lateral and axial temperature gradient were in favor of the heterogeneous nucleation of the crystal. 分析了温度梯度和提拉速率对晶体生长、组织形貌和成分分布的影响,发现正的横向和纵向温度梯度有利于晶体的异质形核;
Design of optical elements with axial-gradient indices 轴向梯度折射率光学元件的设计
Effect of Axial Temperature Gradient on the Egression of Liquid Phases in Melting Growth Process of Bulk YBCO 轴向温度梯度对熔融法YBCO液相损失的影响
We measured the axial temperature gradient of the melt in different hot zone and found that the composite heat shield could increase the axial temperature gradient of the melt. This can improve crystal growth rate and silicon crystal quality. 本文测量了采用不同热屏热场的熔硅纵向温度梯度,发现加强复合式热屏使熔体纵向温度梯度增加,能有效的提高单晶的生长速率和晶体内在质量。
An| P,| W method for designing optical elements with axial-gradient indices is presented. 本文提出一种轴向梯度折射率光学元件的P、W设计方法。
Abstract The radial temperature difference and axial temperature gradient in the shell of coke tower have been served to calculate the stresses caused by them as set up a kinetic coordinates system, according to the practical process. 根据焦炭塔实际的操作条件,通过使用动坐标系建立塔壁二维温度场模型的方法,计算了焦炭塔塔壁的径向温差和轴向温度梯度,进而计算出其产生的应力。
Finally, the impact of axial and radial temperature gradient on a combustor was analyzed and, an optimum thermodynamic condition under simulated circumstances has been identified, thereby making it possible to achieve the aim of optimizing a small-sized combustor. 最后分析了轴向及径向的温度梯度对燃烧器的影响,找到了在模拟条件下最佳的热力条件,并以此达到优化小尺寸燃烧器的目的。
The results show that the silicon melt flow is suppressed but the heater power and the axial temperature gradient on the melt-crystal interface increase when a uniform axial magnetic field is applied. 结果表明:轴向磁场可有效地抑制熔体内的流动,但增大加热器功率和结晶界面处晶体内的轴向温度梯度;
The computation results show that the liquid phase in the reactor is well stirred and nearly uniform throughout, and gas phase concentration of oxygen exists a remarkable axial gradient. 计算表明,釡内液相混合接近全混流,而气相氧浓度存在明显的轴向梯度;
Analysis of the Transform Characteristics of Gaussian Beams through an Axial Gradient Index Plate 一种轴向梯度折射率板的高斯光束变换特性分析
The effect of axial gradient index lens 轴向梯度透镜效应
The axial temperature gradient is over 8 ℃/ mm, which is helpful to the directional growth of the silicon crystals along the axial direction for improving the photovoltaic efficiency of the silicon sheet. 轴向温度梯度大于8℃/mm,这种温度梯度分布特征有利于实现硅晶粒在厚度方向上的定向生长,提高硅片的光电转换效率。
The Effect of Axial Index Gradient in Laser Alignment 激光准直中的轴向折射率梯度效应
Meantime, the shear stress is now caused by the radial velocity gradient as well as the axial velocity gradient, although the contribution to the wall shear stress along the flow directoin of the radial one is relatively small. 同时,切应力也不再仅由轴向流速梯度提供,径向流速梯度也将产生切应力,但是在计算管壁切向上的切应力时,径向流速梯度的贡献仍相当小。
When the axial pressure gradient is less than 22.67, the volume flux in a helical pipe is larger than that in a straight pipe. 当轴向压力梯度小于22.67时,螺旋管道内的流量比相同情况下直管内流量大。
The reasons why surface of workpiece is moistened from bottom to top in quenching and axial hardness gradient is generated after quenching are also given in this paper. 对试验中所观察到的工件表面由底部向顶部逐渐润湿的现象,以及淬火后工件产生轴向硬度梯度的原因进行了解释。
With the help of numerical simulation on temperature field, we get the result that additional axial and radial temperature gradient can increase the stability of interface, decrease thermal convection of fused mass and improve the quality of crystal growth. 通过对温场的数值模拟计算,发现外加轴向、径向温度梯度能够提高界面稳定性,减小熔体热对流,有利提高晶体的生长质量。
Meanwhile, adding liquid to the fluidized bed reactor can affect the heat balance, causing a large bed axial temperature gradient, thereby producing products with specific properties. 同时,液体的加入会引起床层轴向上较大的温度梯度,从而影响产品的分子量与结构。
Lens surface deformation and variation of refractive index under axial temperature gradient are studied. 研究了轴向温度梯度下透镜的形变及折射率分布。
As the thermal environments of gradient temperature distribution are difficult to realize in the experiment, the performance of optical system under axial and radial temperature gradient is analyzed by simulation method, the performance of optical system under uniform temperature analyzed by experiment. 由于梯度温度分布热环境在实验中难以复现,轴向温度梯度和径向温度梯度下光学系统的性能通过仿真方法来分析,而均匀温度热环境下的光学系统性能通过实验进行了分析。
The axial temperature gradient on the rotor ring was smaller than that on the stator ring. 动环的轴向温度梯度略小于静环的轴向温度梯度。