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change of phase
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    An exothermic binary chemical reaction of first order with Arrhenius terms is studied, assuming that one of the reactants can undergo a change of phase. A one dimensional problem is considered and the existence and uniqueness of classical solution of the corresponding system of two parabolic equations with a free boundary are proved.
    我们研究了一阶具有Arrhenius项的二元放热化学反应,假定其中之一反应物可以发生相变.我们考虑了一维情形,得到了相应的具有自由边界的抛物型方程组的古典解的存在唯一性
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  “change of phase”译为未确定词的双语例句
    CONVECTIVE HEAT TRANSFER OF IMMISCIBLE TWO LIQUIDS MIXTURE WITH CHANGE OF PHASE PART Ⅱ EXPERIMENTAL STUDAY ON CONVECTIVE HEAT TRANSFER
    伴随相变的不互溶二元液体混合物的传热 (二)流动传热实验研究
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  change of phase
From these comparisons it becomes apparent that the bounds are adequate when the latent heat is the dominant thermal factor, that is, when more heat is required to produce the change of phase than to warm the substance.
      
A new method called DTA mass-difference baseline, was used to measure the heat capacity and enthalpy change of phase transformation of ionic liquid from DTA curves.
      
Change of Phase-Solubility Behavior by Gamma-Cyclodextrin Derivatization
      
Reproducibility of the change of phase temperature of solid oxygen
      
We also give a lower bound to the scale on which the change of phase occurs, by showing that the empirical spin average is approximately constant on intervals having length of order γ-1-λwith λ∈(0,1) small enough.
      
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Experiments were made on the heat transfer of immiscible two-liquidmixture with eyclohexane as the dispersed phase and water as the continuous phase. For the convective heat transfer of immiscible two-liquid mixture with change of phase there are four different heat transfer regimes; liquid-liquid, vapour-liquid-liquid, vapour-liquid without phase change and boiling vapour-liquid regimes. The phase change of the dispersed drops itself did not exert any enhancement to heat transfer...

Experiments were made on the heat transfer of immiscible two-liquidmixture with eyclohexane as the dispersed phase and water as the continuous phase. For the convective heat transfer of immiscible two-liquid mixture with change of phase there are four different heat transfer regimes; liquid-liquid, vapour-liquid-liquid, vapour-liquid without phase change and boiling vapour-liquid regimes. The phase change of the dispersed drops itself did not exert any enhancement to heat transfer other than the enhancement to turbulent intensity of the immiscible liquids mixture. Based on the analysis of the hydrodynamic characteristics and phase change process of a single liquid drop vaporizing while rising in a column of another immiscible liquida correlation of heat transfer coefficienta for the regimes of vapour-liquid-liquid andvapour-liquid-liquid without phase change is proposed. The calculated results of heat transfer coefficients from the correlation agree well with the experimental data.

本文以环已烷为分散相、水为连续相进行了不互溶二元液体混合物的流动传热实验:分析了传热机理;关联了实验数据。对于伴随相变化的不互溶二元液体混合物的流动传热过程。从传热机理上可将其分为四个不同的传热区域。即:液—液、汽—液—液、无相变汽—液和汽—液沸腾四个区域。在汽—液—液区域内,分散相液滴的相变化仅仅起到对连续相加剧湍动的作用,而相变化本身对多相流与壁面的传热无影响.在对单一液滴在另一与之不互溶的连续相中的流体力学及相变过程研究的基础上,本文着重对汽—液—液和无相变汽—液区域内的传热系数进行了无因次数群关联.经验关联式的计算值能够与实验值较好地吻合。

An exothermic binary chemical reaction of first order with Arrhenius terms is studied, assuming that one of the reactants can undergo a change of phase. A one dimensional problem is considered and the existence and uniqueness of classical solution of the corresponding system of two parabolic equations with a free boundary are proved.

我们研究了一阶具有Arrhenius项的二元放热化学反应,假定其中之一反应物可以发生相变.我们考虑了一维情形,得到了相应的具有自由边界的抛物型方程组的古典解的存在唯一性

Based on the question about resistant drop which the writer encountered when using plate type exchanger in the pretreating process of dehydrating NG in the Liaohe oilfield ,the theoretical analysis and calculation of resistant drop have been made.It is indicated that a thick fluid film is formed on the face of exchanger to increase the resistant drop because of the local change of phase. Therefore, it is not enough only to consider the area of exchanger and a certain acquisition for the plate heat exchanger...

Based on the question about resistant drop which the writer encountered when using plate type exchanger in the pretreating process of dehydrating NG in the Liaohe oilfield ,the theoretical analysis and calculation of resistant drop have been made.It is indicated that a thick fluid film is formed on the face of exchanger to increase the resistant drop because of the local change of phase. Therefore, it is not enough only to consider the area of exchanger and a certain acquisition for the plate heat exchanger used in NG industry with pressure drop control. The structural parameters should be adjusted firstly to obtain the rational and economical area of heat transfer.

针对作者在辽河油田石油天然气脱水预处理装置中使用板式换热器所遇到的阻力降问题 ,进行理论分析和计算。表明石油天然气冷却过程中由于存在着部分集态冷凝过程 ,换热表面形成一定厚度的液膜 ,致使阻力降增大。因此 ,对于石油天然气工业需要控制压力降的工艺流程中冷却用板式换热器 ,仅仅考虑传热面积和留有一定的富裕量是不够的 ,要想有经济、合理的传热面积 ,首先必须从设备结构参数上予以调整

 
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