為了解一冷卻渠道進行往復運動下，其渠道內部冷卻流體隨之作動，造成對渠道頂 部壁面之熱傳效率影響情形，實際架設一組機構來進行實驗，並且探討多組進口流體雷 諾數、無因次振動頻率的組合，將最後結果歸納成以下結論：
1. 當渠道進行振動時，壁面熱傳效率較渠道處於靜止狀態時改善許多，在本實驗中最 大熱傳增益約為 20%。
2. ㄇ型渠道在往復運動下熱傳增益最主要是隨著雷諾數增加而增加，相較之下無因次 振動頻率的改變則影響較小。
參考文獻
1. P. P. Grassmann, and M. Tuma, “Applications of the Electrolytic Method-Ⅱ. Mass Transfer within a Tube for Steady, Oscillating and Pulsating Flows,” International Journal of Heat and Mass Transfer, Vol.22, pp.799-804, 1979.
2. A. T. Patera, and B. B. Mikic, “Exploiting Hydrodynamic Instabilities Resonant Heat Transfer Enhancement,” International Journal of Heat and Mass Transfer, Vol.29, No.8, pp.1127-1138, 1986.
3. S. Y. Kim, B. H. Kang, and A. E. Hyun, “Heat Transfer in the Thermally Developing Region of a Pulsating Channel Flow,” International Journal of Heat and Mass Transfer, Vol.36, No.17, pp.1257-1266, 1993.
4. A. E. Bergles, “Heat Transfer Enhancement – The Encouragement and Accommodation of High Heat Fluxes,” ASME Journal of Heat Transfer, Vol.119, pp.8-19, 1997.
5. R. L. Webb, E. R. G. Eckert, and R. J. Goldstein, “Heat Transfer and Friction in Tubes with Repeated-Rib Roughness,” International Journal of Heat and Mass Transfer, Vol.14, No.4, pp.601-617, 1971.
6. J. C. Han, “Heat Transfer and Friction in Channels with Two Opposite Rib-Roughed Walls,” ASME Journal of Heat Transfer, Vol.106, pp.774-781, 1984.
7. M. R. Mackley, G. M. Tweddle, and I. D. Wyatt, “Experimental Heat Transfer Measurements for Pulsatile Flow in Baffled Tubes,” Chemical Engineering Science, Vol.45, No.5, pp.1237-1242, 1990.
8. M. R. Mackley, and X. Ni, “Mixing and Dispersion in a Baffled Tube for Steady Laminar and Pulsatile Flow,” Chemical Engineering Science, Vol.46, No.12, pp.3139-3151, 1991.
9. S. W. Chang, and L. M. Su, “Influence of Reciprocating Motion on Heat Transfer Inside a Ribbed Duct with Application to Piston Cooling in Marine Diesel Engines,” Journal of Ship Research, Vol.41, No.4, pp.332-339, 1997.
10. 廖英皓，”活塞頂部之熱傳分析”，國立交通大學機械工程學系碩士論文，2003。
11. 連信宏，”利用多孔性介質增強活塞頂面之熱傳效率”，國立交通大學機械工程學系 碩士論文，2005。
12. 余政倫，”往復式冷卻渠道之熱流實驗”，國立交通大學機械工程學系碩士論文，
2006。
13. W. S. Fu, S. H. Lian, and Y. H. Liao, “An investigation of heat transfer of a reciprocating piston,” International Journal of Heat and Mass Transfer, Vol.49, pp.4360-4371, 2006.
14. T. Nishimura, A. Taurmoto, and Y. Kawamura, “Flow and Mass Transfer Characteristics in Wavy Channels for Oscillatory Flow,” International Journal of Heat Mass Transfer, Vol.30, pp.1007-1015, 1987.
15. W. J. Yang, Handbook of Flow Visualization, Hemisphere Publishing Corporation, 1989.
16. T. J. Mueller, Fluid Mechanics Measurements, R. J. Goldstein, Hemisphere Publishing Corporation, 1983.
17. S. J. Kline, “The Purpose of Uncertainty Analysis,” ASME Journal of Heat Transfer, Vol.117, pp.153-160, 1985.
18. R. J. Moffat, “Using Uncertainty Analysis in the Planning of an Experiment,”
ASME Journal of Heat Transfer, Vol.117, pp.173-178, 1985.
附錄、實驗不準度分析
為提供有效的測試結果，並說明當次測試結果的信賴度，實驗不準度之計算和分析 是必要的，一般不準度的表示方式有絕對不準度與相對不準度兩種，本文採用 Kline［17］
之相對不準度來分析第三章實驗結果，根據 Kline 之研究
Q = − = 0.0578592-0.012276=0.045583（W）
故Q 之不準度為 air
1.1.1. 輸入能量之不準度 ii. 巴沙木尺寸 31.00mm*12.00mm，游標尺最小刻度 0.05mm
因此
iii.溫差最大範圍 28－27.1=0.9℃，DA2500E 之準確度為 0.1℃
因此 0.045583 5 0.012276
% 04 . 0.045583 1 0.0578592
1.2. ㄇ形渠道寬度W 之不準度
加熱片面積 31.00mm×12.00mm，游標尺最小刻度 0.05mm
因此
根據式（14）其不準度為
3.2. ㄇ形渠道寬度之不準度
A 為渠道截面積，W為渠道寬度 29.75mm，z 為渠道高度 89.7mm， ii. 巴沙木尺寸 31.00mm*12.00mm，游標尺最小刻度 0.05mm
因此
iii.溫差最大範圍 26.0－25.1=0.9℃，DA2500E 之準確度為 0.1℃
因此 0.004329 5 0.012276
% 69 . 0.004329 1 0.016605
加熱片面積 31.00mm×12.00mm，游標尺最小刻度 0.05mm
因此
加熱片與室溫溫度差最大範圍 26.0－21.1=4.9℃，DA2500E 之準確度為 0.1℃，平 均溫差容許的誤差為 0.2℃
空氣之熱傳導係數k 由查表得知，其不準度趨近於零 a