本文以固定與往復式移動的衝擊噴流加熱電子零件進行數值模擬，以探討其暫態流場結構及熱傳特性的影響，文中以控制體積配合有限差分法和冪次法則，來離散與時間有關的不可壓縮Navier-stoke 方程式，利用著名的 紊流雙方程式來解析紊流流場。以SIMPLE運算法則求解動量方程式中速度與壓力的結合問題。
本文的研究參數範圍為進口溫度( )、雷諾數( )、移動頻率( )，與暫態的時間變化( )。數值結果顯示往復式移動的加熱噴嘴比固定的噴嘴有更均勻的溫度分佈，在本文的研究範圍中可找出一最佳的頻率 ，本研究將可提有關固定或往復式移動噴流衝擊加熱設計之資訊。

　　In this study, numerical simulations are performed to examine the influence of transient flow field structures and heat transfer characteristics of stationary and reciprocating nozzle impinging on the electronic component. The time-dependent incompressible Navier-Stokes equations are solved using a Control-Volume-based finite-difference method with power-law scheme and the well know turbulence model. The velocity and pressure terms of momentum equations are solved by SIMPLE (Semi-Implicit Method for Pressure-Linked Equation) method.
　　The parameter ranges studied include inlet　temperature ,Reynold number , moving frequency ,and also the transient time variation . Detailed analysis of instantaneous flow field and heat transfer characteristics has been performed. It is found that unsteady heat transfer characteristics are strongly affected by the vortex dynamics of the jet flow. The uniformity of the solid surface temperature is achieced by using the reciprocating nozzle due to it suppresses the secondary vortex The optimum frequency is found for the best temperature uniformity. This study provides the information of trainsient impingement heating design for a stationary and resiprocating nozzle.

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