Abstract
Effective thermal performance of oscillating heat pipe (OHP) is driven by inside pressure distribution. Heat transfer phenomena were reported in terms of pressure and frequency of pressure fluctuation in multi loop OHP charged with aqueous Al2O3 and MWCNTs/Al2O3 nanoparticles. The influences on thermal resistance of aqueous Al2O3, MWCNTs as well as the hybrid of them in OHP having 3 mm in inner diameter were investigated at 60% filling ratio. Experimental results show that thermal characteristics are significantly inter-related with pressure distribution and strongly depend upon the number of pressure fluctuations with time. Frequency of pressure depends upon the power input in evaporative section. A little inclusion of MWCNTs into aqueous Al2O3 at 60% filling ratio achieves the highest fluctuation frequency and the lowest thermal resistance at any evaporator power input though different nanofluids cause different thermal performances of OHPs.
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References
CHOI S U S. Enhancing thermal conductivity of fluids with nanoparticles [R]. ASME FED 231, 99. 1995.
AKACHI H. Structure of a heat pipe: US Patent 4921041 [P]. 1990-05-01.
ZHANG Y W, FAGHRI A. Advances and unsolved issues in pulsating heat pipes [J]. Heat Transfer Eng, 2008, 29(1): 20–44.
CHAROENSAWAN P, KHANDEKAR S, GROLL M, TERDTOON P. Closed loop pulsating heat pipes: Part A. Parametric experimental investigations [J]. Applied Thermal Engineering, 2003, 23: 2009–2020.
WANG S F, NISHIO S. Effect of length ratio of heating section to cooling section on properties of oscillating heat pipe [J]. Journal of South China University of Technology: Natural Science, 2007, 35(11): 59–62.
SAHA P, ISHII M, ZUBER N. An experimental investigation of thermally induced flow oscillations in two-phase system [J]. ASME J Heat Transfer, 1976, 98: 616–622.
MO Q, LIANG J T. A novel design and experimental study of cryogenic loop heat pipe with high heat transfer capability [J]. Int J Heat Mass Transfer, 2006, 49: 770–776.
MA H B, WILSON C, YU Q, PARK K, CHOI U S, TIRUMALA M. An experimental investigation of heat transport capability in a nanofluid oscillating heat pipe [J]. J Heat Transfer, 2006, 128: 1213–1216.
MA H B, WILSON C, YU Q, PARK K, CHOI U S, TIRUMALA M. Effect of nanofluid on heat transport capability in an oscillating heat pipe [J]. Appl Phys Lett, 2006, 88: 143116.
QU J, WU H, CHENG P. Thermal performance of an oscillating heat pipe with Al2O3-water nanofluids [J]. Int Commun Heat Mass Transfer, 2010, 37: 111–115.
QU Jian, WU Hui-ying. Thermal performance comparison of oscillating heat pipes with SiO2/water and Al2O3/water, nanofluids [J]. International Journal of Thermal Sciences, 2011, 50: 1954–1962.
SENJAYA R, INOUE T. Bubble generation in oscillating heat pipe [J]. Applied Thermal Engineering, 2013, 60: 251–255.
MAEZAWA S, GI K Y, MINAMISAWA A, AKACHI H. [C]// Proceeding of the 9th International Heat Pipe Conference. Albuquerque, USA, 1996: 791.
NINE Md J, BATMUNKH Munkhbayar, KIM Jun-Hyo, CHUNG Han-Shik, JEONG Hyo-Min. Investigation of Al2O3-MWCNTs hybrid dispersion in water and their thermal characterization [J]. J Nanosci Nanotechnol, 2012, 12: 4553–4559.
PARK Yong-ho, Md Riyad Tanshen, Md J Nine, CHUNG Han-shik, TEONG Hyo-min. Characterizing pressure fluctuation into single-loop oscillating heat pipe [J]. Journal of Central South University, 2012, 19: 2578–2583.
TANSHEN Md R, MUNKHBAYAR B, NINE Md J, CHUNG Hanshik, JEONG Hyomin. Effect of functionalized MWCNTs/water nanofluids on thermal resistance and pressure fluctuation characteristics in oscillating heat pipe [J]. Int Comm Heat Mass Trans, 2013, 48: 93–98.
MUNKHBAYAR B, HWANG S, KIM J, BAE K, JI M, CHUNG H, JEONG H. Photovoltaic performance of dye-sensitized solar cells with various MWCNT counter electrode structures produced by different coating methods [J]. Electrochimica Acta, 2012, 80: 100–107.
MUNKHBAYAR B, MUNKHJARGAL B E, OCHIRKHUYAG B, SARANGEREL D, BATTSENGEL B, CHUNG H, JEONG H. An experimental study of the planetary ball milling effect on dispersibility and thermal conductivity of MWCNTs-based aqueous nanofluids [J]. Materials Research Bulletin, 2012, 47: 4187–4196.
MUNKHBAYAR B, NINE Md J, JEOUN **seong, JEONG M Ji Hyomin, CHUNG Hanshik. Synthesis of a graphene-tungsten composite with improved dispersibility of graphene in an ethanol solution and its use as a counter electrode for dye-sensitised solar cells [J]. J Power Sources, 2013, 230: 207–217.
MUNKHBAYAR B, NINE Md J, HWANG Seunghwa, KIMB Junhyo, BAE Kangyoul, CHUNG Hanshik, JEONG Hyomin. Effect of grinding speed changes on dispersibility of the treated multi-walled carbon nanotubes in aqueous solution and its thermal characteristics [J]. Chemical Engineering and Processing, 2012, 61:36.
NINE Md J, REHMAN Hafizur, CHUNG Han-Shik, BAE Kangyoul, JEONG Hyo-Min. Effect of Ultrasonic Action on Al2O3/water dispersion and thermal characterization with convective heat transfer [J]. Nanosci Nanotechnol Lett, 2012, 4: 827–834.
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Foundation item: Project(NRF-2012R1A1A4A01002052) supported by Basic Science Research Program through the National Research Foundation (NRF) funded by the Ministry of Education, Science and Technology of Korea
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Tanshen, M.R., Lee, S., Kim, J. et al. Pressure distribution inside oscillating heat pipe charged with aqueous Al2O3 nanoparticles, MWCNTs and their hybrid. J. Cent. South Univ. 21, 2341–2348 (2014). https://doi.org/10.1007/s11771-014-2186-y
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DOI: https://doi.org/10.1007/s11771-014-2186-y