模擬迴路式熱管中，迴路式管路中水蒸汽冷凝與凝結水輸送的情況，實驗裝置包括蒸汽產生區、測試管件區、水套和負壓收集區。蒸汽產生區為開收式，取決於測試管件的冷凝能力，被動式的供應水蒸汽，當蒸汽進入測試管件的中間區經由水套冷卻，再藉由管件尾端的毛細結構阻擋住水蒸汽，並將凝結水輸送至負壓收集區。負壓收集區為保持一定的負壓，模擬迴路式熱管中，蒸汽區毛細結構將凝結水吸回的毛細拉力。測試管件的種類有玻璃管、平滑銅管、溝槽銅管，並在其內壁加上一層銅網毛細結構，實驗中測試管件配置的方位包括水平與傾斜15°。測試管件的冷凝效率將由凝結水收集速率來評估。實驗結果發現平滑管件在收集負壓較小的情況下，容易形成大型的蒸汽泡阻斷輸送毛細力，而在內壁加上一層銅網毛細結構後，受到蒸汽泡阻隔的影響較小，且凝結水輸送能力較快，使得水蒸汽冷凝效率提升。

參考文獻：

[1] R. L. Webb,”Next Generation Devices for ElectronicsCooling,”MECE2003-42179, Proceedings of IMECE’03, 2003 ASME International Mechanical Engineering Congress, Washington, D.C., November 15–21, 2003.

[2] A. Faghri, “Heat Pipe Science and Technology,” Taylor & Francis, Washington DC., 1995

[3]. R. Hopkins, A. Faghri, and D. Khrustalev, ”Flat Miniature Heat Pipes with Micro Capillary Grooves,” Journal of Heat Transfer, Vol. 121, No.1, 1999, pp.102-109.

[4] A. Faghri, and D. Khrustalev, “Micro/Miniature Heat Pipe Technology For Electronic Cooling,” WL-TR-97-2083, Final report, July 1997, Wright Laboratory, AFMC, WRAFB OH 45433.

[5] R. Prasher and D. Payne, “Loop Heat Pipe for Mobile Computers,” US Patent No. 6,381,135, April 30, 2002.

[6] T. P. Cotter, ”Principles and Prospects for Micro Heat Pipes,” Proc. 5th Int. Heat Pipe Conf., Tsukuba, Japan, 1984.

[7] G. P. Peterson, “An Introduction to Heat Pipes-Modeling, Testing, and Applications,” Wiley, New York.

[8] D. Khrustalev, A. Faghri, “Thermal Analysis of A Micro Heat Pipe,” ASME Journal ofHeat Transfer, 1994, Vol. 116, pp.189-198.

[9] J. P. Longtin, B. Badran, and F. M Gerner, “A One-Dimensional From Liquid Model of a Micro Heat Pipe During Steady-State Operation,” ASME Journal of Heat Transfer, 1994, Vol. 116, pp.709-715.

[10] Rengasamy Ponnappan, “A Novel Micro-capillary Groove-wick Miniature Heat Pipe,” Power Division, AFRL/PRPG, Propulsion Directorate, Air Force Research Laboratory, Wright-Patterson AFB, Ohio 45433, AIAA 2000-2947.

[11] S. W. Kang and D. Huang, “Fabrication of Star Grooves and Rhombus Grooves Micro Heat Pipe,” Journal of Micromechanics and Microengineering, J. Micromech. Microeng. 12 (2002) 525–531.

[12] Y. Taitel, ”Flow Pattern Transition in Two-phase Flow,” Proc. of 9-th Int. Heat Transf. Conf. 1990, vol.1, pp.239-254, Jerusalem.

[13] K. A. Triplett, S. M. Ghiaasiaan, S. I. Abdel-Khalik, D. L. Abdel-Khalik, and Sadowski, “Gas–liquid two-phase flow in microchannels--Part I: Two-phase flow pattern,” Int. J Multiphase Flow 25(1999), 377-394.

[14] R. S. Stanley, R. F. Barron, and T. A. Ameel, “Two-phase flow in microchannels,” In: Micro-Electro-Mechanical Systems (MEMS), ASME, 1997, DSC-Vol. 62/HTD-Vol. 354, pp. 143-152.

[15] A. Kawahara, P.M.-Y. Chung, and M. Kawaji, ”Investigation of two-phase flow pattern, void fraction and pressure drop in a microchannel,”Int. J. Multiphase Flow 28 (2002)1411-1435.

[16] A. Serizawa, Z. Feng, and Z. Kawara, “Two-phase flow in microchannels,”Exp. Therm. Fluid Sci. 26 (2002) 703-714.

[17] S. J. Eckels, M. B. Pate, ”Evaporation and Conddensation of HFC-134a and CFC-12 in a Smooth and a Micro-Fin Tube,” ASHRAE Trans.97 (2) (1991) 71-81

[18] D. Graham, J. C. Chato, and T. A. Newell, “Heat Transfer and Pressure Drop Durin Condensation of Arefrigerant 134a in an Axially Grooved Tube,” International Journal of Heat and Mass Transfer 42 (1999) 1935-1944

[19] J. S. Shin, M. H. Kim, ”An Experimental Study of Flow Condensation Heat Transfer Inside Circular and Rectangular Mini-Channels,” Second International Conference on Microchannels and Minichannels June 17-19, 2004, Rochester, New York USA ICMM2004-2391.

[20] http://www.jpl.nasa.gov/adv_tech/thermal/LHP.htm

[21] New York: Crane Company, “Flow of Fluids through Valves, Fittings, and Pipe,” Technical Paper No.410, 1982.