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首页> 外文期刊>International Journal of Heat and Mass Transfer >Experimental study on heat transfer and pressure drop characteristics of air-water two-phase flow with the effect of polyacrylamide additive in a horizontal circular tube
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Experimental study on heat transfer and pressure drop characteristics of air-water two-phase flow with the effect of polyacrylamide additive in a horizontal circular tube

机译：水平聚丙烯圆管内聚丙烯酰胺添加剂对气水两相流传热及压降特性的实验研究

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Experiments of air-water two phase heat transfer and frictional pressure drop without and with polyacrylamide (PAM) additive in a horizontal smooth circular tube were conducted. A PAM water solution with a concentration of 300 ppm was used in the experiments. The test tube has an inside diameter of 40 mm and an outside diameter of 48 mm. Heat transfer tests were performed by cooling air-water flow inside the test tube through its wall using cooling water with a heat transfer length of 3 m and two phase pressure drops were measured over a length of 3.1 m. The liquid phase superficial velocity V~(LS)-0.52,1.02 and 1.46 m/s and the gas phase superficial velocity V~(GS) - 1.66-4.9 m/s. The average volume void faction β = 0.532-0.904. The total mass flux G-5199-15,234 kg/m~2s and the gas phase Reynolds number Re_G- 3892-12,025. It shows that the air-water two phase pressure drops can be reduced from 31.9% to 54.7% while the two phase heat transfer coefficients can be reduced from 36.8% to 70.3% with the PAM additive. Furthermore, the effects of the PAM additive on the air-water two phase heat transfer and pressure drop characteristics have been analyzed. The observed flow patterns are all slug flows. New physical mechanisms of the two phase pressure drop and heat transfer reductions have been proposed.
机译：在水平光滑圆管中进行了不添加聚丙烯酰胺（PAM）和添加聚丙烯酰胺（PAM）的空气-水两相传热和摩擦压降实验。实验中使用浓度为300 ppm的PAM水溶液。试管的内径为40毫米，外径为48毫米。通过使用传热长度为3 m的冷却水冷却试管内穿过壁的空气流来进行传热测试，并在3.1 m的长度上测量了两相压降。液相表观速度V〜（LS）-0.52、1.02和1.46 m / s，气相表观速度V〜（GS）-1.66-4.9 m / s。平均体积空隙率β＝ 0.532-0.904。总质量通量为G-5199-15,234 kg / m〜2s，气相雷诺数为Re_G-3892-12,025。结果表明，使用PAM添加剂，气水两相压降可以从31.9％降低到54.7％，而两相传热系数可以从36.8％降低到70.3％。此外，分析了PAM添加剂对空气-水两相传热和压降特性的影响。观察到的流型均为all流。已经提出了两相压降和传热降低的新物理机制。

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