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等温面
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    Two analytical methods to determine the boiling heat transfer relationship on a non-uniformly heated surface are proposed,which are based on the experiments with widelyused vapour-cooled structures.
    针对工业中广泛使用的沸腾换热结构提出了利用实验测定非等温面沸腾换热关系的两种实验分析方法。
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    For uniform temperature surface, the CHF increases with the subcooling.
    对等温面,CHF随过冷度的增加而增加。
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Two analytical methods to determine the boiling heat transfer relationship on a non-uniformly heated surface are proposed,which are based on the experiments with widelyused vapour-cooled structures. After the temperature distributions on the heat transfer boundary surface are measured, the relationship can be determined by use of solving the boundary value problem for the temperature. If the unit of the structure is slender and symmetrical about the central line, the relationship can also be determined by means...

Two analytical methods to determine the boiling heat transfer relationship on a non-uniformly heated surface are proposed,which are based on the experiments with widelyused vapour-cooled structures. After the temperature distributions on the heat transfer boundary surface are measured, the relationship can be determined by use of solving the boundary value problem for the temperature. If the unit of the structure is slender and symmetrical about the central line, the relationship can also be determined by means of measuring the temperature distribution along the central line or on the heat transfer surface.Based on the second method,the existing experimental data is analyzed and the relationships are determined. The significant difference between the heat tranfer relationships on an isotemperature surface and on the surface with non-uniform temperature. was found.

针对工业中广泛使用的沸腾换热结构提出了利用实验测定非等温面沸腾换热关系的两种实验分析方法。一种是测定换热边界上的温度分布,通过求解温度场的边值问题,确定其换热关系。另一种是,如果实际换热单元较细长而对称,则测定对称轴线上或换热侧面上的温度分布,即可得到温度场和换热关系。文中利用第二种方法分析了现有的实验结果,确立了非等温表面沸腾换热关系,发现该换热关系曲线与“拔山”曲线有着重要差别,文中还就这种差别进行了讨论。

The critical heat flux (CHF) of subcooled boiling is theoretically predicted by using the microlayer model. The enhancement of heat transfer for subcooled boiling is mainly contributed by the augmented heat convection caused by the forming and collapsing of individual bubbles. For uniform heat flux surface, the CHF approaches a constant at high subcooling region. For uniform temperature surface, the CHF increases with the subcooling. The evaporative heat transfer becomes small and the total heat flux is mainly...

The critical heat flux (CHF) of subcooled boiling is theoretically predicted by using the microlayer model. The enhancement of heat transfer for subcooled boiling is mainly contributed by the augmented heat convection caused by the forming and collapsing of individual bubbles. For uniform heat flux surface, the CHF approaches a constant at high subcooling region. For uniform temperature surface, the CHF increases with the subcooling. The evaporative heat transfer becomes small and the total heat flux is mainly contributed by the heat conduction outside the evaporating area as the subcooling is increased.

本文利用微液层模型对过冷沸腾的临界热流密度(CHF)进行了理论预测。过冷沸腾的强化换热主要是通过单个气泡的形成和消失造成的对流换热强化而引起的。对等热流面,CHF在高过冷区趋近于常数;对等温面,CHF随过冷度的增加而增加。过冷度增加时,蒸发换热量减少,总热流密度主要由蒸发区外的导热引起。

 
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