Flow Visualization and Thermal Behavior of Oscillating-Move Pin Arrays with Symmetrical Impinging Jets

本研究以實驗方法探討往復震盪運動效應對具對稱圓形衝擊噴流之鰭柱陣列的流動特徵與熱傳增益影響，強制對流冷卻系統通常運用穩態穩流流過靜止目標物，本研究將四組鰭柱陣列垂直裝置於方形基座的四個側壁，基座則置於往復震盪運動之平台上，同時安排兩個圓形噴流衝擊於基座相對面的兩組鰭柱陣列上，變動參數包括：噴射雷諾數、平台之往復震盪運動模式、震盪頻率與噴流衝擊距離，實驗結果指出，平台上下往復運動的行程遠超過鰭柱陣列的高度，此時會使得鰭柱陣列的整體熱傳能力比靜止平台時衰退許多；而平台左右往復運動的行程只些許超過鰭柱陣列的寬度，所以其對應之整體熱傳能力只比靜止平台時略低，此外，較長的噴嘴到鰭柱陣列的距離會產生較小的整體熱傳性能；最後，本研究完成一系列的煙流場觀測，除可辨明相關流動行為，更可輔助解釋對應的熱傳特性。

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並列摘要

This work experimentally investigated the effect of the reciprocating and oscillating move on the fluid flow characteristics and heat transfer enhancement of the pin arrays under impingement cooling condition. The forced convective cooling system usually applies the steady flow to pass through a stationary target. This work mounted vertically four sets of pin arrays on the four side walls of a square base. The base was installed at a reciprocating and oscillating move platform with symmetrical circular impinging jets. Variable parameters are the jet Reynolds number, the oscillating mode of platform, the oscillating frequency and the impinging distance. The experimental results indicate that the overall heat transfer of the oscillating pin arrays drop significantly by comparing with the stationary pin arrays since that the oscillating-move stroke of the platform moving up and down was much longer than the height of the pin array; while the overall heat transfer was declined slightly since that the move stroke of the platform moving left and right was somewhat longer than the width of the pin array. Besides, the shorter distance between the jet nozzle and the pin array was desired for the higher overall heat transfer performance.

並列關鍵字

oscillation move ； pin arrays ； flow visualization ； heat transfer ； impinging jets

國際替代計量

Flow Visualization and Thermal Behavior of Oscillating-Move Pin Arrays with Symmetrical Impinging Jets

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