頁籤選單縮合
題名 | 方形衝擊噴流作用於散熱片之數值模擬=Numerical Simulation of Heat Sink Performance Using Jet Impingement |
---|---|
作者 | 陳宗輝; 陳立月; Chen, Tzong-huei; Chen, Li-yueh; |
期刊 | 大漢學報 |
出版日期 | 20111200 |
卷期 | 25 2011.12[民100.12] |
頁次 | 頁95-133 |
分類號 | 448.533 |
語文 | chi |
關鍵詞 | 衝擊噴流; 散熱片; 計算流體力學; Impingement jet; Heat sink; Computational fluid dynamics; |
中文摘要 | 對於高功率電子元件有效可靠的熱管理方式一直是引起關注的課題,而在眾多的冷卻技術中,衝擊噴流深獲工業界廣泛應用,主要是因為衝擊噴流冷卻具有便利性、經濟性、穩定性、高效率及清潔等優點。本研究將進行具衝擊噴流之散熱片性能研究,並採用計算流體力學套裝軟體ANSYS CFX進行數值模擬,分析在不同鰭片寬度、高度、噴嘴流速與衝擊距離下之散熱片熱流特性。流體研究的範圍僅限於層流部份,並且假定衝擊噴流口為方形。研究結果顯示,增加噴嘴流速可以使散熱片散熱效益增大,但是其效果卻會隨著雷諾數的增加而逐漸減緩;在鰭片寬度的影響上,當低雷諾數的衝擊噴流時,其熱傳效益會隨著鰭片寬度的增加而降低,但當散熱片於高雷諾數的衝擊噴流時,噴流具有較大的質量流率,可提供更佳的散熱片散熱效益。在鰭片長度的影響上,鰭片長度低者,其熱阻值最低。最後,在衝擊距離的影響上,雷諾數效應對於散熱片熱傳效益佔著重要影響地位,因此選用衝擊距離時,提供更多彈性選擇空間。 |
英文摘要 | The thermal management of high heat flux electronic components for reliable and effective operation has drawn much attention. Among these cooling technologies, the use of air impingement has been widely used in industrial transport processes since air impingement cooling has the advantage of convenience, economy, stability, high efficiency and cleanness. In this study, a CFD software ANSYS CFX is used to investigate the characteristics of the heat sink design. The investigated topic includes the width and the height of the fins, the jet velocity, and the distance between the nozzle and the tip of the fins. The flow is assumed to be laminar and the square cross section of the impingement jet is specified. The research reveals that increasing the flow velocity of the impingement jet can increase the heat transfer of the heat sink. However, the enhancement of heat transfer decreases gradually as the Reynolds number increases. In addition, the thermal resistance decreases with increasing fin width at low Reynolds number while the heat transfer rate can be increased at high Reynolds number due to the effect of a large amount of flow rate. The decreased fin length is found to be able to enhance the heat transfer rate. Finally, the jet spread distance is dependent on the Reynolds number, which indicates that the selection of jet and heat sink configuration has to be compromised in order to reach an optimal performance of heat transfer rate. |
本系統之摘要資訊系依該期刊論文摘要之資訊為主。