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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental investigation of heat transfer from inclined flat surface to aqueous foam
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Experimental investigation of heat transfer from inclined flat surface to aqueous foam

机译：从倾斜的平面向泡沫水传热的实验研究

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Paper presents the results of the experimental investigation of heat transfer process between the inclined flat surface and the longitudinal upward macrofoam (foam) flow. Investigation was performed on the special laboratory stand using macrofoam, which was generated inside the channel on the perforated plate. Foaming solution was made from the 0.5% concentration of the washing powder (TIDE Absolute) solution in water and gas (air). Macrofoam parameters: velocity 0.10 ÷ 0.30 m/s; volumetric void fraction 0.996 ÷ 0.998; bubble dimensions 0.005 ÷ 0.015 m. Inclination angle of the flat surface 45°. Experimental surface was heated using electric current; surface temperature varied from 16.8 to 36.2 ℃; foam flow temperature varied from 14.6 to 19.5 ℃. Investigation showed that the heat transfer rate depends on the foam flow characteristics (velocity and volumetric void fraction) and on the drained liquid film parameters (film thickness, film flow velocity and direction). It was stated that the heat transfer rate increases with the increase of the foam flow velocity up to the critical value. When the foam flow velocity exceeds the critical value, the thickness of the drained liquid film begins to grow and heat transfer rate decreases. Further augmentation of the foam flow velocity forms a concurrent drained liquid flow and heat transfer intensity increases again. The experimental results were compared with the results obtained for the vertical flat surface and for the different types of the tube bundles as well.
机译：本文介绍了在倾斜的平面和纵向向上的大泡沫（泡沫）流之间进行传热过程的实验研究结果。研究是在特殊的实验室支架上使用大泡沫进行的，大泡沫是在多孔板上通道内部产生的。泡沫溶液是由在水和气体（空气）中浓度为0.5％的洗衣粉（TIDE Absolute）溶液制成的。泡沫塑料参数：速度0.10÷0.30 m / s;体积空隙率0.996÷0.998;气泡尺寸0.005÷0.015 m。平面倾斜角为45°。用电流加热实验表面；表面温度从16.8到36.2℃不等；泡沫流动温度在14.6至19.5℃之间变化。研究表明，传热速率取决于泡沫的流动特性（速度和体积空隙率）以及排出的液膜参数（膜厚度，膜流速和方向）。据指出，传热率随着泡沫流速的增加而增加，直至达到临界值。当泡沫流速超过临界值时，排出的液膜的厚度开始增长并且传热速率降低。泡沫流速的进一步增大形成同时排出的液体流，并且传热强度再次增加。将实验结果与垂直平面以及不同类型的管束的结果进行了比较。

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