Abstract
Using ethanol or acetone as the working fluid, the performance of starting up and heat transfer of closed-loop plate oscillating heat pipe with parallel channels (POHP-PC) were experimentally investigated by varying filling ratio, inclination, working fluids and heating power. The performance of the tested pulsating heat pipe was mainly evaluated by thermal resistance and wall temperature. Heating copper block and cold water bath were adopted in the experimental investigations. It was found that oscillating heat pipe with filling ratio of 50% started up earlier than that with 70% when heating input was 159.4 W, however, it has similar starting up performance with filling ratio of 50% as compared to 70% on the condition of heat input of 205.4 W. And heat pipe with filling ratio of 10% could not start up but directly transit to dry burning. A reasonable filling ratio range of 35%‒70% was needed in order to achieve better performance, and there are different optimal filling ratios with different heating inputs - the more heating input, the higher optimal filling ratio, and vice versa. However, the dry burning appeared easily with low filling ratio, especially at very low filling ratio, such as 10%. And higher filling ratio, such as 70%, resulted in higher heat transfer ( dry burning ) limit. With filling ratio of 70% and inclination of 75°, oscillating heat pipe with acetone started up with heating input of just 24W, but for ethanol, it needed to be achieved 68 W, Furthermore, the start time with acetone was similar as compared to that with ethanol. For steady operating state, the heating input with acetone was about 80 W, but it transited to dry burning state when heating input was greater than 160 W. However, for ethanol, the heating input was in vicinity of 160 W. Furthermore, thermal resistance with acetone was lower than that with ethanol at the same heating input of 120 W.
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Abbreviations
- m :
-
mass (kg)
- m :
-
mass flow rate (kg/s)
- t :
-
temperature(°C)
- C p :
-
constant pressure specific heat (J/(kg·°C))
- R :
-
thermal resistance(°C/W)
- Q :
-
quantity of heat transfer (W).
- τ :
-
time (s)
- e:
-
evaporation
- c:
-
condenser
- out:
-
outlet of cooling water
- in:
-
inlet of cooling water
References
H. Akachi, US Patent No. 4921041, 1990
Yang H H, Khandekar S, Groll M, Operational limit of closed loop pulsating heat pipes. Applied Thermal Engineering 2008; 28: 49–59.
Kim S, Zhang Y, Choi J., Effects of fluctuations of heating and cooling section temperatures on performance of a pulsating heat pipe, Applied Thermal Engineering 2013; 58 (1): 42–51.
Xue Zhh, Qu W, Experiment study on effect of inclination angles to ammonia pulsating heat pipe. Chinese Journal of Aeronautics 2014; 27(5): 1122–1127.
Wang XH, Zheng HC, Si MQ, Han XH, Chen GM, Experimental investigation of the influence of surfactant on the heat transfer performance of pulsating heat pipe. International Journal of Heat and Mass Transfer 2015; 83: 586–590.
Lin Z, Wang S, Chen J, Experimental study on effective range of miniature oscillating heat pipes. Applied Thermal Engineering 2011; 31(5): 880–886.
Xian H ZH, Xu W J, Zhang Y N, Experimental investigations of dynamic fluid flow in oscillating heat pipe under pulse heating. Applied Thermal Engineering 2014; 88(9): 376–383.
Han X, Ma HB, Jiao AJ, et al. Investigations on the heat transport capability of a cryogenic oscillating heat pipe and its application in achieving ultra-fast cooling rates for cell vitrification cryopreservation. Cryobiology 2008; 56: 195–203.
Natsume K, Mito T, Yanagi N, et al. Heat transfer performance of cryogenic oscillating heat pipes for effective cooling of superconducting magnets, Cryogenics 2011; 51: 309–314.
Clement J, Wang X, Experimental investigation of pulsating heat pipe performance with regard to fuel cell cooling application. Appl. Therm. Eng. 2013; 50(1): 268–274.
Rittidech S, Wannapakne S. Experimental study of the performance of a solar collector by closed-end oscillating heat pipe(CEOHP). Applied Thermal Engineering 2007; 27: 1978–1985.
Rittidech S, Donmaung A, Kumsombut K. Experimental study of the performance of a circular tube solar collector with closed-loop oscillating heat-pipe with check valve (CLOHP/CV). Renewable Energy 2009; 34: 2234–2238.
Nuntaphan A, Vithayasai S, Vorayos N. Use of oscillating heat pipe technique as extended surface in wire-on-tube heat exchanger for heat transfer enhancement. International Communications in Heat and Mass Transfer 2010; 37: 287–292.
Yin D, Rajab H, Ma HB, Theoretical analysis of maximum filling ratio in an oscillating heat pipe. International Journal of Heat and Mass Transfer 2014, 74: 353–357.
Balkrishna M, Khandekar S, Taylor bubble-train flows and heat transfer in the context of Pulsating Heat Pipes. International Journal of Heat and Mass Transfer 2014; 79: 279–290.
Peng H, Frank Pai P, Ma HB,, Nonlinear thermomechanical finite-element modeling, analysis and characterization of multi-turn oscillating heat pipes. International Journal of Heat and Mass Transfer 2014; 69: 424–437.
Thompson S M, Cheng P, Ma H B, An experimental investigation of a three-dimensional flat-plate oscillating heat pipe with staggered microchannels. International Journal of Heat and Mass Transfer 2011; 54: 3951–3959.
Wang Y, Li W Y, Operation performance of a closed loop pulsating heat pipe with parallel channels. Journal of Chinese Society of Power Engineering 2011, 31(4): 273–277.
Shi, W X, Pan, L S, Li, W Y, Experiment Study on Influence of Inclination and Cooling Condition on Heat Transfer Performance of Closed Loop Plate Pulsating Heat Pipe with Parallel Channels. Journal of Chemical Industry and Engineering 2014; 665(2): 532–537.
Acknowledgments
Project 51306198 supported by National Natural Science Foundation of China, Project 00921915023 supported by Organization Department of Beijing, Project NR2013K07 supported by Beijing Key Lab of Heating, Gas Supply, Ventilating and Air Conditioning Engineering and Project 331614013 supported by Beijing University of Civil Engineering and Architecture are gratefully acknowledged.
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Shi, W., Pan, L. Influence of filling ratio and working fluid thermal properties on starting up and heat transferring performance of closed loop plate oscillating heat pipe with parallel channels. J. Therm. Sci. 26, 73–81 (2017). https://doi.org/10.1007/s11630-017-0912-0
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DOI: https://doi.org/10.1007/s11630-017-0912-0