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浮力对流
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  buoyancy convection
     In earthgravity environment, Gr>104, it is impossible to neglect the impact of buoyancy convection on flow and heat transfer.
     在常重力条件下,当熔体的Gr数大于104时,浮力对流才发挥作用。
短句来源
     The convection in molten liquid can be much more weakened by buoyancy convection increasing the flow of liquid encapsulation in this model.
     在本文模型中,浮力对流促进了液封层的流动,从而加大了对熔体热毛细对流的抑制作用。
短句来源
     Buoyancy driven convection behaves differently under different conditions of the thickness of melts and the direction of melts plane,A simple periodic oscillatory mode associated with wave motion of the thermocapillary convection has also been observed under suppressing buoyancy convection.
     改变熔体层厚度和熔体平面方向与重力场方向的夹角,得到了不同的流动形貌。 通过阻抑浮力对流,对表面张力对流也进行了观察研究。
短句来源
     The results show that: in earthgravity environment, it is impossible to neglect the impact of Marangoni convections on flow and heat transfer under certain conditions. When the directions of buoyancy convection are the same as that of Marangoni convection, the flow, compared with the case of microgravity field, is fortified due to mutual promotion of the two types of convections.
     结果表明:在常重力场中,一定条件下的Marangoni对流对流动和传热的影响不容忽视,当浮力对流与Marangoni对流同向时,二者的相互促进使流动较微重力场显著增强,从而导致恒温壁面处的换热增强;
短句来源
  “浮力对流”译为未确定词的双语例句
     Thermocapillary-buoyancy Convection in a Shallow Annular Pool for Moderate Prandtl Number Fluid
     环形浅液池内中等Pr数流体热毛细—浮力对流
短句来源
     Thermocapillary-buoyancy Convection in a Thin Annular Pool for Moderate Prandtl Number Fluid
     环形浅液池内中等Pr数流体的热毛细-浮力对流
     The results show that: the crucible rotation with proper rotation rate can suppress the strong convection driven by the crystal rotation and the buoyancy, that the isotherms near the melt/crystal interface tend to be flat with the increasing crystal rotation rate, that the proper matching of the rotation rates of the crucible and crystal can damp the temperature fluctuations near the melt/crystal interface, and that the effect of the thermocapillary force on the intense flow is negligible.
     结果表明:适当的坩埚旋转能有效抑制晶体旋转产生的对流和浮力对流,增大晶体转速能使晶体/熔体界面附近等温线更加平直,适当的坩埚、晶体转速匹配能够抑止晶体/熔体界面附近的温度波动,热毛细力对强烈熔体流动的影响可以忽略不计,但对较弱的熔体流动影响较大。
短句来源
     An optical diagnostic system consisting of Michelson interferometer with image processor has been developed for study of the kinetics of Buoyant-Thermcapillary Convection.
     将Michelson光学干涉测量系统与图像处理技术相结合,发展形成一种实时诊断热毛细对流和浮力对流流体表面形貌的实验测量系统.
短句来源
     However, in normal gravity, the buoyant convection and gravitational sedimentation make the process complicated.
     但是,常重力条件下的浮力对流和重力沉降使得燃烧现象变得复杂.
短句来源
更多       
  相似匹配句对
     STUDY ON THE SURFACE DEFORMATION IN BUOYANT-THERMCAPILLARY CONVECTION USING THE OPTICAL BAR LINES METHOD
     浮力-热毛细对流表面位型研究
短句来源
     The Analysis of Buoyancy
     浮力分析
短句来源
     Buoyancy Instability in the Natural Convection Boundary Layer around A Heated Vertical Flat Plate
     竖直加热平板自然对流边界层的浮力不稳定性
短句来源
     Determination of Cooling Curve at Convection
     对流冷却的测定
短句来源
     GENERAL BUOYANCY FORMULA
     广义浮力公式
短句来源
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  buoyancy convection
This convection was not paid much attention up to now, because under terrestrial conditions it is superimposed by the strong buoyancy convection.
      
Thermocapillary and buoyancy convection is studied experimentally using particle-image-velocimetry with liquid crystal tracers for flow visualization and analysis.
      
Consequently, the initiation of this oscillation seems to be independent of gravity and so of buoyancy convection.
      
We studied the thermocapillary and buoyancy convection in the cavities, filled with low-Prandtl-number fluids, with two aspect-ratiosA=1 and 4, Grashof number up to 105 and Reynolds number ?Re?≤104.
      
Buoyancy Convection in Low Prandtl Number Liquids with Large Temperature Variation
      
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By the method of remelting and recrystalization, the GaAs single crystal doped with Te grew from the floating melt in microgravity environment in space. The GaAs single crystal broke in the middle, showing that the long floating melt was not stable. No impurity striations were found in the middle part of the crystal, which indicated that buoyancy-driven convec-ion disappeared, but they were observed on he outer layer of the crystal, showing that there existed Marangoni convection. The control of segregation...

By the method of remelting and recrystalization, the GaAs single crystal doped with Te grew from the floating melt in microgravity environment in space. The GaAs single crystal broke in the middle, showing that the long floating melt was not stable. No impurity striations were found in the middle part of the crystal, which indicated that buoyancy-driven convec-ion disappeared, but they were observed on he outer layer of the crystal, showing that there existed Marangoni convection. The control of segregation mechanism of impurities in the short melting zone and the volatilization of Te impurity from the melt resulted in the decrease of impurity contents and nonuniform macroscopic distribution of impurities in the crystal. The dislocation defect in the crystal was due to the thermal stress caused during rapid growth and the collapse of vacancy clusters at the side of interface seed crystal.

在空间微重力环境中,用重熔再结晶法从悬浮熔体生长了掺杂Te-GsAs单晶,晶体从中间断开表明长悬浮熔体的不稳定性,晶体中部未见杂质条纹说明浮力对流已消失,而外层有杂质条纹表明存在Marangoni对流,晶体中杂质含量减少和宏观分布不均匀,是短熔区杂质分凝机制控制和杂质Te从熔体挥发的结果,晶体中的高位错缺陷是快速生长和退火时产生的热应力以及界面籽晶侧的空位团崩塌造成的。

A high temperature in situ observation method has been newly developed by coupling differential interference microscope(DIM)with the Schlieren method.The method aims at observing and recording the whole process of growing and melting of oxide crystals in high temperature up to 1400℃, with very high visibility of surface kinetic processes and mass flow behaviors near the growing interface. The diffusion boundary layer around the crystal and buoyancy-driven convection has been observed for the first time in the...

A high temperature in situ observation method has been newly developed by coupling differential interference microscope(DIM)with the Schlieren method.The method aims at observing and recording the whole process of growing and melting of oxide crystals in high temperature up to 1400℃, with very high visibility of surface kinetic processes and mass flow behaviors near the growing interface. The diffusion boundary layer around the crystal and buoyancy-driven convection has been observed for the first time in the color Schlieren photographs of growing KNbO_3 crystals. Buoyancy driven convection behaves differently under different conditions of the thickness of melts and the direction of melts plane,A simple periodic oscillatory mode associated with wave motion of the thermocapillary convection has also been observed under suppressing buoyancy convection.

本文提供了实时观察高温熔体晶体生长的新方法。此方法是将休伦(Schlieren)技术和微分干涉显微镜(DIM)技术相结合,能同时观察到晶体生长中的表面动力学过程和生长界面处的输运现象。在KNbO_3熔体晶体生长中的生长图案和输运现象首次被同时观察到。改变熔体层厚度和熔体平面方向与重力场方向的夹角,得到了不同的流动形貌。通过阻抑浮力对流,对表面张力对流也进行了观察研究。

The solidification experiments of eutectic Ph-Sn were accomplished at the 1g, 5g, 10g and 15g gravity levels in a centrifuge with 1. 3m radius. For observing and analyzing the effects of buroyancy convection on the microstructure and morphology of eutectic, The eutectic Pb-Sn alloys are solidified in high gravity by using the Bridgman technique. Experimental results show that the Ph-Sn eutectic growth forms are remarkable difference in the rarious gravity levels, at 1g with regular lamellar eutectic and at 5g,...

The solidification experiments of eutectic Ph-Sn were accomplished at the 1g, 5g, 10g and 15g gravity levels in a centrifuge with 1. 3m radius. For observing and analyzing the effects of buroyancy convection on the microstructure and morphology of eutectic, The eutectic Pb-Sn alloys are solidified in high gravity by using the Bridgman technique. Experimental results show that the Ph-Sn eutectic growth forms are remarkable difference in the rarious gravity levels, at 1g with regular lamellar eutectic and at 5g, 10g with the cell-dendrite forms but at 15g the growth pattern is changed as regular lamellar eutectic. The reason of different eutectic morphologies is that the Perturbation character of buroyancy convection is different in the various gravity levels.

采用臂长为1.3m的离心机实现1、5、10和15g四个重力水平;利用Bridgman法使Ph—Sn共晶在超重力下单向凝固发现Ph—Sn共晶生长形态因重力水平而异:1g时为挺直的片晶,5、10g时呈胞技状生长,15g时又以一种挺直的片晶方式生长;共品组织形态的差异是由于不同重力水平下浮力对流干扰特性不同所致

 
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