Abstract
Using ethanol or acetone as the working fluid, visualization of oscillations in steady state was observed visually by high-speed cameras, and temperature oscillating and heat transfer characteristics of closed-loop plate oscillating heat pipe with parallel channels (POHP-PC) were experimentally investigated by varying liquid filled ratios (50%, 70%, 85%), section scales (1 mm×1 mm and 1 mm×1.5 mm), inclination angles, working fluids and heating inputs. It was found that during operating there was mixed flow consisting of plug flow and annular flow in channels of oscillating heat pipe at steady-state. There was an equilibrium position for working fluid of condenser during oscillating, and periodic oscillations occurred up and down in the vicinity of equilibrium position. With heat input increasing, equilibrium position rose slowly as a result of vapor pressure of evaporation. Evaporation temperature oscillating amplitude possessed a trend of small-large-small and frequency trend was of small-large during steady-state. It may be generally concluded that temperature, whether evaporator or condenser, fluctuated sharply or rose continuously when oscillating heat pipe coming to dry burning state. Simultaneously, it was found that temperature difference of cooling water possibly dropped with heat input rising during dry burning state. Thermal resistance of No. 2 with acetone was lower than that of No. 1 during experiments, but No. 2 achieving heat transfer limit was earlier than No. 1. However, with ethanol, thermal resistance of No. 1 and No. 2 were similar with the heating input less than 110–120 W and filling ratios of 50% and 70%. And with filling ratio of 85%, heating transfer performance of No. 2 was better compared to No. 1 during all the experiments.
Similar content being viewed by others
References
AKACHI H. Structure of a heat pipe: US, 4921041[P]. 1990.
HU Jian-jun, XU Jin-liang. Experimental study of pulsating heat pipe with mercury and water as working fluid [J]. Journal of Chemical Industry and Engineering, 2008, 59(5): 1083–1089. (in Chinese)
LIN Zing-rong, WANG Shuang-feng, ZHAGN Wei-bao, CHEN Jin-jian. Heat-transport capability of pulsating heat pipe enhanced by functional thermal fluids [J]. Journal of Chemical Industry and Engineering, 2009, 60(6): 1373–1379. (in Chinese)
WANG X H, ZHEGN H C, SI M Q, HAN X H, CHEN G M. Experimental investigation of the influence of surfactant on the heat transfer performance of pulsating heat pipe [J]. International Journal of Heat and Mass Transfer, 2015, 83: 586–590.
MOHAMMADI M, MOHAMMA M, SHAFII M B. Experimental investigation of pulsating heat pipe using ferro-fluid [J]. Journal of Heat Transfer, 2012, 134: 1–3.
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.
LIN Zi-rong, WANG Shuang-feng, CHEN Jin-jian. Experimental study on effective range of miniature oscillating heat pipes [J]. Applied Thermal Engineering, 2011, 31: 880–886.
HENADRI V A, GUPTA A, KHANDEKAR S. Thermal radiators with embedded pulsating heat pipes: Infra-red thermography and simulations [J]. Applied Thermal Engineering, 2011, 31: 1332–1346.
SHAO Wei, ZHAGN Yu-wen. Effects of film evaporation and condensation on oscillatory flow and heat transfer in an oscillating heat Pipe [J]. Journal of Heat Transfer, 2011, 133: 1–11.
THOMPSON S M, MA H B, WILSON C. Investigation of a flat-plate oscillating heat pipe with Tesla-type check valves [J]. Experimental Thermal and Fluid Science, 2011, 35: 1265–1273.
SUPIRATTANAKUL P, RITTIDECH S, BUBPHACHOT B. Application of a closed-loop oscillating heat pipe with check valves (CLOHP/CV) on performance enhancement in air conditioning system [J]. Energy and Buildings, 2011, 43: 1531–1535.
XIAN Hai-zhen, XU Wen-jin, ZHANG Yu-ning, DU Xiao-ze, YANG Yong-ping. Experimental investigations of dynamic fluid flow in oscillating heat pipe under pulse heating [J]. Applied Thermal Engineering, 2015, 88: 376–383.
CHEN Yong-ping, ZHU Wang-fa, ZHAGN Cheng-bin. Thermal characteristics of heat pipe with axially swallow-tailed microgrooves [J]. International Journal of Chemical Industry and Engineering, 2010, 18(2): 185–193.
MA Yong-xi, ZHANG Hong. Analysis of heat transfer performance of oscillating heat pipes based on a central composite design [J]. Chinese Journal of Chemical Engineering, 2006, 14(2): 223–228.
MA Qiang, ZHANG Ying, ZENG Jian-bang, HAN Jing-xiao, JIA Guo-rui. Lattice-boltaman simulation for bubble pulsate flow in capillary tube [J]. Journal of Chemical Industry and Engineering, 2011, 62(11): 3101–3108. (in Chinese)
YIN D, RAJAB H, MA H B. Theoretical analysis of maximum filling ratio in an oscillating heat pipe [J]. International Journal of Heat and Mass Transfer, 2014, 74: 353–357.
THOMPSON S M, CHENG P, MA H B. An experimental investigation of a three-dimensional flat-plate oscillating heat pipe with staggered microchannels [J]. International Journal of Heat and Mass Transfer, 2011, 54: 3951–3959.
KHANDEKAR S, GROLL M. An insight into thermo-hydrodynamic coupling in closed loop pulsating heat pipes [J]. International Journal of Thermal Sciences, 2004, 43: 13–20.
WANG Yu, LI Wei-yi. Operation performance of a closed loop pulsating heat pipe with parallel channels [J]. Journal of Chinese Society of Power Engineering, 2011, 31(4): 273–277. (in Chinese)
SHI Wei-xiu, PAN Li-sheng, LI Wei-yi. Experiment study on influence of inclination and cooling condition on heat transfer performance of closed loop plate pulsating heat pipe with parallel channels [J]. Journal of Chemical Industry and Engineering, 2014, 665(2): 532–537. (in Chinese)
LIANG Yu-hui, LI Wei-yi, SHI Wei-xiu. Effect of inclination angle and liquid filling ratio inclination on heat transfer characteristics of parallel type pulsating heat pipe [J]. Journal of Chemical Industry and Engineering, 2011, 62(S2): 46–51. (in Chinese)
Author information
Authors and Affiliations
Corresponding author
Additional information
Foundation item: Project(51306198) supported by the National Natural Science Foundation of China; Project(NR2013K07) supported by Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering, China; Project( 331614013) supported by Beijing University of Civil Engineering and Architecture, China; Project(00921915023) supported by Organization Department of Beijing, China
Rights and permissions
About this article
Cite this article
Shi, Wx., Pan, Ls. Experiment investigation on visualization and operating characteristics of closed loop plate oscillating heat pipe with parallel channels. J. Cent. South Univ. 23, 2410–2418 (2016). https://doi.org/10.1007/s11771-016-3300-0
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s11771-016-3300-0