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首页> 外文期刊>Experimental Thermal and Fluid Science: International Journal of Experimental Heat Transfer, Thermodynamics, and Fluid Mechanics >Laboratory investigation and commercial test for rotors-assembled strand applied in smooth tube
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Laboratory investigation and commercial test for rotors-assembled strand applied in smooth tube

机译：光滑管中的转子组装线的实验室研究和商业测试

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摘要

In the commercial test for smooth tube inserted with rotors-assembled strand comparing with non-inserted ones on condensers in electric power plant, using water as working fluid, the single-phase pressure drop and heat transfer were measured. It was found difficult to receive reliable and accurate enough data through commercial test. Meanwhile, the single-phase pressure drop and heat transfer in a rotors-assembled strand inserted tube were measured in laboratory, with the tube side Prandtl numbers varying from 5.67 to 5.80 and the tube side Reynolds numbers varying from 21,300 to 72,200. Before that, a validation experiment based on the same smooth tube was carried out to testify the experimental system and the data reduction method, in which fixed mounts were employed to eliminate entrance effects. The Prandtl numbers varied from 5.64 to 5.76 and the Reynolds numbers varied from 19,000 to 56,000 in the tube. The annular side Reynolds numbers remained nearly constant at the value of around 50,000 for all experiments, with the annular side Prandtl numbers varying from 8.02 to 8.22. The experimental results of smooth tube show that employment of fixed mounts leads to a visible bias of friction factor at relative low Reynolds numbers while it hardly affects the Nusselt numbers. On the other hand, experiment for the tube inserted with rotors-assembled strand show remarkable improvement for heat transfer with the Nusselt number increased by 9.764-11.87% and the overall heat transfer coefficient increased by 7.08-7.49% within the range of Reynolds number from about 21,300 to 55,500. Meanwhile, friction factor increases inevitably by 278.1-353.9% within the same range of Reynolds number. Based on through multivariant linear normal regression method, the Reynolds number and Prandtl number dependencies of the Nusselt number and friction factor were determined to be Nu = 0.0031 Re(0.9)Pr1.0849 and f = 0.993Re(-0.22). (C) 2008 Published by Elsevier Inc.
机译：在商业试验中，以水为工作流体，在水轮机的冷凝器中插入有转子组装线的光滑管与未插入的光滑管进行比较，测量了单相压降和传热。发现很难通过商业测试来接收可靠和准确的数据。同时，在实验室中测量了转子组装的绞合插入管中的单相压降和传热，管侧的Prandtl数在5.67至5.80之间，管侧的雷诺数在21,300至72,200之间。在此之前，进行了基于同一光滑管的验证实验，以验证实验系统和数据缩减方法，其中采用固定支架消除入口效应。管中的普朗特数从5.64到5.76不等，雷诺数从19,000到56,000不等。在所有实验中，环形侧雷诺数几乎保持恒定在50,000左右，环形侧普朗特数在8.02至8.22之间变化。光滑管的实验结果表明，在相对较低的雷诺数下使用固定安装座会导致可见的摩擦系数偏差，而几乎不会影响Nusselt数。另一方面，插入转子组装线的管的实验表明，在雷诺数范围内，Nusselt数增加了9.764-11.87％，总传热系数增加了7.08-7.49％，显着改善了传热。约21,300至55,500。同时，在相同的雷诺数范围内，摩擦系数不可避免地增加278.1-353.9％。基于多元线性正态回归方法，确定努塞尔数和摩擦系数的雷诺数和普朗特数依赖性为Nu = 0.0031 Re（0.9）Pr1.0849和f = 0.993Re（-0.22）。 （C）2008由Elsevier Inc.发布

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