• 作者： 黃吉川；蔡明杰；尹士豪；鄧治東
• 作者服務機構： 中原大學機械工程研究所
• 中文摘要： 本文利用解析法研究矩形熱虹管系統的起動及振盪式穩定性問題，當中能量方程式包含軸向熱導傳效應。分析顯示，軸向熱導傳的穩定化效應在系統趨近臨界條件時即變得很重要。另外由計算得知，當雷利數(Ra)大於此系統 的啟動臨界值(Rao)，則工作流體即會由靜止狀態變?定常的循環流動，若雷利數更進一步大於其振盪臨界值(Raos)，則 此定常流動即會衍生振盪式的不穩定。
• 英文摘要： The onset and oscillatory instabilities of natural convection flows in a rectangular closed-loop ther-mosyphon are investigated analytically. In this study the energy equation includes the axial conduction term. It is shown that the stabilized effect of the axial conduction term is important when the system nears the critical conditions. The results also show that if the magnitude of the Rayleigh number, Ra, is larger than a onset critical value, Rao, then the working fluid will circulate steadily from the rest state. In addition, oscillatory instability of the steady state will occur when the magnitude of Ra is larger than the corresponding oscillatory critical value, Raos.
• 中文關鍵字： thermosyphon; stability
• 英文關鍵字： --