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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 >Thermofluidynamic analysis of the flow in a sharp 180 degrees turn channel
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Thermofluidynamic analysis of the flow in a sharp 180 degrees turn channel

机译：180度急转弯通道内流动的热流动力学分析

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摘要

The aim of the present study is to obtain surface flow visualisation, as well as local and spanwise averaged heat transfer measurements near a 180 degrees sharp turn in a rectangular channel. The channel aspect ratio (width to height ratio) varies from 1 to 5 and the ratio between the width of the channel and that of the partition wall is always equal to 5. Heat transfer measurements are pet-formed by means of the heated-thin-foil technique, which practically corresponds to a constant heat flux boundary condition, and by using infrared (IR) thermography. Two different heating conditions, in particular heating from one side (asymmetrical), or from two sides (symmetrical), are implemented. The convective heat transfer coefficient is evaluated from the measured temperature maps and the local bulk temperature of the flow which is obtained by making a one-dimensional balance along the channel. Results are presented in terms of local. or averaged, Nusselt number which is normalised with the classical Dittus and Boelter correlation. The fluid used during the test is air and the Reynolds number, based on the flow average velocity and channel hydraulic diameter, is varied between 16.000 and 60.000. (C) 2000 Elsevier science Inc. All rights reserved. [References: 24]
机译：本研究的目的是获得表面流的可视化，以及矩形通道中180度急转弯附近的局部和展向平均传热测量值。通道的宽高比（宽高比）从1到5不等，通道的宽度与隔断壁的宽度之比始终等于5。传热测量是通过薄型加热成型的。箔技术，它实际上对应于恒定的热通量边界条件，并使用红外（IR）热成像技术。实施两种不同的加热条件，特别是从一侧（不对称）或从两侧（对称）加热。对流传热系数由测得的温度图和通过沿通道进行一维平衡而获得的流的局部整体温度来评估。结果以本地表示。或平均的Nusselt数，可通过经典Dittus和Boelter相关性进行归一化。测试期间使用的流体是空气，基于流平均速度和通道水力直径，雷诺数在16.000至60.000之间变化。 （C）2000 Elsevier science Inc.保留所有权利。 [参考：24]

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