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等温面
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    Both analytical methods and numerical techniques showed thatthe instantaneous cooling rate causes the interface to become increasingly con-cave in Vertical Gradient Freeze Method. Dimensionless number D_e=R~2_ρc_pC. /〔k(T_h-T_o)〕is defined to express the extent that the interface becomesmore concave arised from instantaneous cooling rate.
    本文用解析和数值计算的方法,证明了静态温梯法晶体生长中,瞬时降温速率有使固液等温面下移且变得更凹的倾向,定义了降温显热数 De=R~2pc_pCo/k(T_h-T_c),用来表征瞬时降温速率使固液等温面变凹的程度。
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  isothermal surface
The flow past a circular cylinder with an isothermal surface at Mach numbers M∞=2 and 5 and Reynolds numbers ranging from 104 to 108 is investigated on the basis of the Reynolds equations using a differential two-equation turbulence model.
      
Supersonic Flow Past a Circular Cylinder with an Isothermal Surface
      
Supersonic perfect-gas flow past a circular cylinder with an isothermal surface is investigated at the Mach number 5 and Reynolds numbers ranging from 30 to 500,000.
      
Results are given of numerical simulation of hydrodynamics and heat transfer under conditions of transverse flow past a two-dimensional "trench" (a groove whose cross section has the form of a segment of circle) located on a plane isothermal surface.
      
Results are given of numerical simulation of hydrodynamics and heat transfer under conditions of transverse flow past a two-dimensional "trench" (a groove whose cross section has the form of a segment of circle) located on a plane isothermal surface.
      
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The growth Parameters(freezangs rate,temperature gradient,shapes of isotherm andinterface,simulation of temperature field etc.)characterized by means of various mathemeticalmodel analyses in Bridgman-Stockbarger technique and their influnce on crystal growth are re-viewed on the basis of literatures.

本文根据文献评述了坩埚下降法技术中通过各种数学模型分析来表征的生长参数(冷凝速率、温度梯度、等温面和界面形状。温场模拟等)。以及这些生长参数对晶体生长的影响。

Both analytical methods and numerical techniques showed thatthe instantaneous cooling rate causes the interface to become increasingly con-cave in Vertical Gradient Freeze Method.Dimensionless number D_e=R~2_ρc_pC./〔k(T_h-T_o)〕is defined to express the extent that the interface becomesmore concave arised from instantaneous cooling rate.

本文用解析和数值计算的方法,证明了静态温梯法晶体生长中,瞬时降温速率有使固液等温面下移且变得更凹的倾向,定义了降温显热数 De=R~2pc_pCo/k(T_h-T_c),用来表征瞬时降温速率使固液等温面变凹的程度。

The atmosphere of the gravitational field is in an unbalanced state, whose temperature is regarded as the function of the space, and therefore, there exists a kind of heat conduction among different isothermal surfaces so that the spatial distribution of the entropy is changed. This paper is an attempt to deduce the formula of how the entropy is generated in the gravitational field and to depict the approximate crooked line of how such generation depends on the change of the height.

重力场中的大气处于非平衡态,其温度是空间的函数,不同的等温面之间要产生热流,从而改变熵的空间分布.本文推导出重力场中的熵产生公式,并描绘出熵产生随高度变化的近似曲线.

 
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