本研究是利用計算流體力學之數值方法(CFD)，結合分析軟體，來探討一個三維之內藏式高速馬達主軸的冷卻水道，於暫態模式下，主軸的熱傳導現象分析，首先使用模擬軟體Gambit建立高速主軸內含螺旋式冷卻水道的模型及網格設定，再以計算流體力學套裝軟體Fluent來完成數值模擬分析，再配合適當的邊界條件。研究中所設定的邊界條件，冷卻水道內的冷卻液介質為水，其流速及溫度分別為0.475m/s與17℃(290K)，主軸起始溫度為20℃(293K)，材質為SUS405（熱傳導係數 K=16.3 W/m-k），系統控制方程式有流線、動量及能量函數，經無因次化後配合適當之邊界條件，以計算流體力學(CFD)方法求解，數值計算是用辛普法(simple；Semi-Implicit Method for Pressure Linked Equation)並以個人筆記型電腦來求解，而有關影響主軸之對流道內流場與熱場的影響，即熱通量(Heat Flux)、對流熱傳係數(Heat Transfer Coefficient)、單位體積熱源產生率(Heat Generation Rate)、與紐塞數(Nusselt number)，及相關物質材料之物理參數，在冷卻液為層流(laminar flow)之狀態及暫態熱傳條件下，模擬出主軸在固定熱源(120W)及冷卻液流速為0.475 m/s時的冷卻效果及熱擴散分佈狀態。

This study analyzes the transient heat transfer of a three-dimensional built-in high speed motor spindle using the software of computational fluid dynamics (CFD). A fixed input of heat (q=120W) is provided through the inner spindle wall. the main axis of the heat conduction of analysis. The built-in motor is cooled by a water chamber for continuous running. The cooling water has velocity and temperature at (0.475 m/s; 17℃). and the spindle is made of SUS405 with thermal conductivity K = 16.3W/mk. The spindle starts running at temperature of 20℃. The system considered is solved using CFD (Computational Fluid Dynamics) method. The SIMPLE scheme (Semi - Implicit Method for Pressure Linked Equation) is adopted for computation in the numerical procedure in a personal notebook computer. The thermal phenomena of the spindle under the effect of Reynolds number and some other parameters are discussed and presented with the heat flux, Nusselt number, and volumetric heat generation rate.