冲击平面的声激励脉动气流的流动和传热行为

IF 4.9 2区 工程技术 Q1 ENGINEERING, MECHANICAL International Journal of Thermal Sciences Pub Date : 2024-09-18 DOI:10.1016/j.ijthermalsci.2024.109417
Dnyanesh Mirikar, Pawan Sharma, Harekrishna Yadav
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引用次数: 0

摘要

实验旨在了解脉动射流的流动和热行为。脉动射流是利用声学激励产生的。研究考虑了雷诺数(Re = 2800、4900 和 6800)、斯特劳哈尔数(St = 0-0.84)、脉动振幅(A = 0-60%)和喷嘴到表面距离(z/d = 1-8)的变化。研究结果表明,与稳定射流相比,脉动射流的潜在核心长度较短。潜在核心长度最初随着 St 的增加而减小,直到 0.42,然后开始增加。由于周围流体的更大夹带和混合作用,脉动射流改善了壁面射流区域的热性能。结果表明,与稳定射流相比,在 Re = 2800 条件下,脉动射流可将平均传热率提高 58%。虽然脉动射流的传热率更高,但脉动频率或振幅的变化影响甚微。在斯特劳哈尔数相同的情况下,随着雷诺数的增加,平均传热率的提高幅度减小。每个测试的雷诺数都表明,脉动射流的传热性能比稳定射流至少提高 10%。声学脉动室热性能的提高为加强各种应用中的热管理提供了可能。
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Flow and heat transfer behavior of acoustically excited pulsating air jet impinging on a flat surface

Experiments are carried out to understand the flow and thermal behavior of a pulsating jet. The pulsating jet is generated using acoustic excitation. The study considered variations in Reynolds number (Re = 2800, 4900, and 6800), Strouhal number (St = 0–0.84), pulsation amplitude (A = 0–60 %), and nozzle-to-surface distance (z/d = 1–8). Findings revealed that the potential core length of the pulsating jet is shorter compared to the steady jet. The potential core length initially decreases with an increase in St up to 0.42, then begins to increase. Pulsating jets improve thermal performance in the wall jet region due to greater entrainment and mixing from the surrounding fluid. Results demonstrated that pulsating jets could increase average heat transfer rate by up to 58 % at Re = 2800 compared to the steady jet. Although heat transfer rates are higher in pulsating jets, changes in pulsation frequency or amplitude had a minimal effect. The enhancement in average heat transfer rate diminishes as the Reynolds number increases for the same Strouhal number. Each tested Reynolds number showed at least a 10 % improvement in heat transfer in pulsating jet over steady jet. The improved thermal performance of the acoustically pulsating chamber offers the potential for enhanced thermal management in various applications.

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来源期刊
International Journal of Thermal Sciences
International Journal of Thermal Sciences 工程技术-工程:机械
CiteScore
8.10
自引率
11.10%
发文量
531
审稿时长
55 days
期刊介绍: The International Journal of Thermal Sciences is a journal devoted to the publication of fundamental studies on the physics of transfer processes in general, with an emphasis on thermal aspects and also applied research on various processes, energy systems and the environment. Articles are published in English and French, and are subject to peer review. The fundamental subjects considered within the scope of the journal are: * Heat and relevant mass transfer at all scales (nano, micro and macro) and in all types of material (heterogeneous, composites, biological,...) and fluid flow * Forced, natural or mixed convection in reactive or non-reactive media * Single or multi–phase fluid flow with or without phase change * Near–and far–field radiative heat transfer * Combined modes of heat transfer in complex systems (for example, plasmas, biological, geological,...) * Multiscale modelling The applied research topics include: * Heat exchangers, heat pipes, cooling processes * Transport phenomena taking place in industrial processes (chemical, food and agricultural, metallurgical, space and aeronautical, automobile industries) * Nano–and micro–technology for energy, space, biosystems and devices * Heat transport analysis in advanced systems * Impact of energy–related processes on environment, and emerging energy systems The study of thermophysical properties of materials and fluids, thermal measurement techniques, inverse methods, and the developments of experimental methods are within the scope of the International Journal of Thermal Sciences which also covers the modelling, and numerical methods applied to thermal transfer.
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