喷嘴碰撞运动对平板传热特性的影响

IF 2.8 4区工程技术 Q2 ENGINEERING, MECHANICAL

Journal of Heat Transfer-transactions of The Asme Pub Date : 2023-05-27 DOI:10.1115/1.4062639

A. Abo El –Wafa, M. Attalla, Hussein M. Maghrabie, Ahmed N. Shmroukh

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引用次数: 0

摘要

本实验研究的目的是评估冲击气流运动对固定平板换热特性的影响。在喷嘴速度(Vn)为400 ~ 1000mm /min，雷诺数(Re)为8000 ~ 20000，喷嘴与板的距离(H/D)为2和6的条件下进行了实验。基于温度轮廓和局部努塞尔数，对固定喷嘴和活动喷嘴进行了比较。此外，还对局部努塞尔数、换热均匀性指数和换热均匀性进行了评价。结果表明，当Vn为400 mm/min, Re为20000,H/D为2时，局部努塞尔数的最大值为24.8。当Vn = 1000, Re = 20000, H/D = 6时，传热均匀性达到最大值89.5%。换热均匀性指数随Vn的增大而减小，当Vn为400 mm/min、Re为8000、H/D为2时，传热均匀性指数最大值为0.34。

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Influence of Impinging Jet Nozzle Movement On Heat Transfer Characteristics of a Flat Plate

The purpose of the present experimental study is to assess the influence of impinging air jet movement on heat transfer characteristics of a fixed flat plate. The experiments are conducted with varying the nozzle velocity (Vn) from 400 to 1000 mm/min, and the Reynolds number (Re) from 8000 to 20000 at a nozzle-to-plate distance (H/D) of 2 and 6. A comparison between a movable nozzle and a fixed nozzle based on the temperature contours and local Nusselt number is presented. Additionally, the local Nusselt number, heat transfer uniformity index, and uniformity of heat transfer are evaluated. The results demonstrate that the maximum value of local Nusselt number of 24.8 is obtained at a Vn of 400 mm/min, Re of 20000, and H/D of 2. The uniformity of heat transfer is enhanced by increasing the Vn and its maximum value of 89.5 % is maintained at a Vn of 1000, Re of 20000, and H/D of 6. Additionally, the heat transfer uniformity index decreases with increasing the Vn where its maximum value is 0.34 at a Vn of 400 mm/min, Re of 8000, and H/D of 2.

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来源期刊

Journal of Heat Transfer-transactions of The Asme 工程技术-工程：机械

自引率

0.00%

发文量

182

审稿时长

4.7 months

期刊介绍： Topical areas including, but not limited to: Biological heat and mass transfer; Combustion and reactive flows; Conduction; Electronic and photonic cooling; Evaporation, boiling, and condensation; Experimental techniques; Forced convection; Heat exchanger fundamentals; Heat transfer enhancement; Combined heat and mass transfer; Heat transfer in manufacturing; Jets, wakes, and impingement cooling; Melting and solidification; Microscale and nanoscale heat and mass transfer; Natural and mixed convection; Porous media; Radiative heat transfer; Thermal systems; Two-phase flow and heat transfer. Such topical areas may be seen in: Aerospace; The environment; Gas turbines; Biotechnology; Electronic and photonic processes and equipment; Energy systems, Fire and combustion, heat pipes, manufacturing and materials processing, low temperature and arctic region heat transfer; Refrigeration and air conditioning; Homeland security systems; Multi-phase processes; Microscale and nanoscale devices and processes.