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首页> 外文期刊>Energy Conversion & Management >A novel caudal-fin-inspired hourglass-shaped self-agitator for air-side heat transfer enhancement in plate-fin heat exchanger
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A novel caudal-fin-inspired hourglass-shaped self-agitator for air-side heat transfer enhancement in plate-fin heat exchanger

机译：新型尾鳍式沙漏形自搅拌器，用于增强板翅式热交换器的空气侧传热

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摘要

A novel caudal-fin-inspired hourglass-shaped self-agitator installed inside a plate-fin heat exchanger has been experimentally investigated to characterize its thermo-hydraulic performance. Because of fluid-structure interaction between the air and the caudal-fin-inspired hourglass-shaped self-agitator, there is periodic conversion between fluid kinetic energy and elastic strain energy. Vortices generated by the self-sustained vibration of the self-agitator enhance flow mixing and thus heat transfer performance. Experiments were conducted at a wide range of Reynolds numbers from 400 to 10,000, which covered the laminar-transitional-turbulent regime. Experimental correlations of pressure drop as a function of a dimension parameter, friction factor, and Nusselt number have been proposed. Mutual coupling motions and effects of multiple-row flapping caudal-fin-inspired hourglass-shaped self-agitators in parallel and tandem configurations were studied by using a high-speed camera. A stereo Particle Image Velocimetry system was used to conduct detailed flow field measurements to quantify the flow mixing level. Parameter studies for the stream-wise distance (Le., the pitch) between the neighboring caudal-fin-inspired hourglass-shaped self-agitators have been investigated to exploit the best performance of the heat exchanger equipped with caudal-fin-inspired hourglass-shaped self-agitators. For the chosen plate-fin heat exchanger and assigned working conditions, the best heat transfer performance was obtained with twelve-row self-agitators with a pitch of 12.5 mm, which caused a 200% increase in the Nusselt number over the clean channel at the same Reynolds number. However, the best overall performance was obtained with six-row self-agitators with a pitch of 25 mm, which caused a 68% enhancement in thermal-hydraulic characteristics compared to the clean channel at the same Reynolds number.
机译：已对安装在板翅式换热器中的新型尾翅式沙漏形自搅拌器进行了实验研究，以表征其热工液压性能。由于空气和由尾鳍启发的沙漏形自搅拌器之间的流体结构相互作用，因此在流体动能和弹性应变能之间存在周期性的转换。由自搅拌器的自持振动产生的涡流增强了流动混合，从而增强了传热性能。在雷诺数范围从400到10,000的广泛范围内进行了实验，涵盖了层流过渡湍流状态。已经提出了作为尺寸参数，摩擦系数和努塞尔数的函数的压降的实验相关性。利用高速相机研究了多排拍打式尾鳍式沙漏形自搅拌器在平行和串联配置中的相互耦合运动和效果。使用立体粒子图像测速系统进行详细的流场测量以量化流混合水平。已研究了相邻的尾鳍启发式沙漏形自搅拌器之间的流向距离（Le。，节距）的参数研究，以利用配备有尾鳍启发式沙漏的热交换器的最佳性能。形的自搅拌器。对于选定的板翅式换热器和指定的工作条件，节距为12.5 mm的十二行自搅拌器可获得最佳的传热性能，这导致在清洁通道上方的努塞尔数增加200％相同的雷诺数。但是，使用间距为25 mm的六排自搅拌器可获得最佳的整体性能，与相同雷诺数下的清洁通道相比，这导致热工液压特性提高了68％。

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