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| 題 名 | 具連續移動平板之三維紊流噴射撞擊流場之熱傳數值分析=Numerical Analysis of Convective Heat Transfer of 3-D Turbulent Impinging Jets with a Continous Moving Plate |
|---|---|
| 作 者 | 莊書豪; 鍾毓偉; | 書刊名 | 機械技師學刊 |
| 卷 期 | 7:3 2014.11[民103.11] |
| 頁 次 | 頁30-38 |
| 分類號 | 440.137 |
| 關鍵詞 | 三維紊流; 移動衝擊面; 橫向流; 上沖噴泉流; 迴流區; Moving impinging surface; Crossflow; Recirculation region; |
| 語 文 | 中文(Chinese) |
| 中文摘要 | 本文主要是針對於具連續移動平板之三維素流噴射撞擊流的流場與熱傳特性作數值模擬與分析。採用計算流體力學PHOENICS軟體來模擬衝擊表面的熱傳分佈。分別就衝擊面移動的速度比(Vp)以及噴嘴排列方式等參數變化對衝擊表面局部紐塞數的影響逐一探討。由研究的結果顯示,兩主噴射流撞擊衝擊面後,將產生上沖噴泉流,且經由流體間的交互作用而導致兩個低壓迴流區的存在。各參數的變化對於流場結構與衝擊表面熱傳效率更很大的影響。當衝擊面移動的速度增加時,衝擊表面摩擦係數及局部紐塞數的峰值變小且位置略更向衝擊面移動方向偏移的現象。另外,衝擊表面的壁合流區與停滯線呈現彎曲狀,其上沖噴泉流也產生偏向。進而導致衝擊表面停滯區的熱傳效率更顯著地減少。綜合言之,忽略衝擊面移動,將導致衝擊表面熱傳效率的高估。為了設計出性能更加的冷卻或加熱系統,暸解上述的因素對熱傳效率的影響是非常必要的。 |
| 英文摘要 | This study presents the numerical simulation and analysis on the fluid flow and heat transfer characteristics of three-dimensional turbulent impinging jets with a continuous moving plate. The computational fluid code, PHOENICS, is used to simulate the distribution of heat transfer on the impinging surface. The effect of the jet Reynolds number Re, nozzle-to-nozzle distance (L), two plates distance (H), the ratio of impinging surface velocity (Vp), the ratio of crossflow velocity (M), and nozzle arrangements on plate heat transfer will be studied ne. It is found that upwash fountain flow between the two nozzles is generated when impinging jets di -rected outward or normal to the plate. Two lower pressure recirculation regions are induced due to the inter-action between impinging jets and fluid surroundings. The flow structure and the rate of heat transfer on im-pinging surface are significantly affected by relevant parameters. The results show that heat transfer rate on the impinging surface is decreased while the ratio of crossflow velocity to mean jet velocity (M) is increased. Neglecting impinging surface motion effects can lead to the heat transfer is overestimated. It is very important to understand the heat transfer rate from relevant fac-tors for designing a cooling or heating system with better performance. |
本系統中英文摘要資訊取自各篇刊載內容。