Experimental study on effective range of miniature oscillating heat pipes

Lin, Zijian; Wang, Shuangfeng; Chen, Jin-Jian; Huo, Jiepeng; Hu, Yi; Zhang, Winston

doi:10.1016/j.applthermaleng.2010.11.009

Cited by 71 publications

(23 citation statements)

References 19 publications

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“…The ever-changing pressure field and fluid phase induces the chaotic displacement and circulation of the internal working fluid. The performance (running limits [2], temperature oscillation [3], heat transfer resistance ) of an OHP is known to depend on working fluid [4][5], filling ratio [6], channel geometry, number of serpentine-arranged turns, operating orientation, heating/cooling methods [7][8][9] and application [10][11][12][13]. Furthermore, the investigation was also carried on by simulation or theory.…”

Section: Introductionmentioning

confidence: 99%

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

Shi

Pan

2017

J. Therm. Sci.

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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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Section: Introductionmentioning

confidence: 99%

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

Shi

Pan

2017

J. Therm. Sci.

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“…The operating temperature was 301 K and the initialized filling ratio was taken as 50% [18]. In the model solution the pressure velocity coupling was taken as PISO with skewness-neighbor coupling.…”

Section: Solution Methodsmentioning

confidence: 99%

“…The heat flux in evaporation section depended on the power input. According to the general temperature requirement of electronic cooling and the experimental results [18], the heating powers are not over 100 W. Hence maximum heat flux of 100W is assigned at the evaporator. The convection heat transfer coefficient in condensation section was set to about 4000 W/ (m 2 K).…”

Section: B Computational Model Set-upmentioning

confidence: 99%

“…The copper was chosen as tube material. According to the experimental conditions [18] four turn PHP is divided into 3 parts; evaporator section, adiabatic section, and condenser section. The corresponding sections are shown in Fig 1. The geometric dimension of CLPHP are mentioned in Table 1.…”

Section: A Physical Modelmentioning

confidence: 99%

“…Hence in this work a computational model for CLPHP is developed to simulate the process of flow and heat transfer, including the oscillations and the temperature change due to evaporation and condensation occurring in bottom heating mode. Experimental results [18] were eventually used to verify the model established in this paper…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

CFD modeling for thermal performance of Closed Loop Pulsating heat pipe in bottom heated mode

Parwani¹,

Gupta²

2017

Sixth International Conference on Advances in Civil, Structural and Mechanical Engineering - ACSM 2017

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Development of a novel artificial neural network model for closed pulsating heat pipe with water and aqueous solutions

Wang

Wright

Liu

et al. 2021

Asia-Pacific J Chem Eng

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Aqueous solutions are increasingly introduced as the working fluids of pulsating heat pipe (PHP), to balance and optimise certain thermo-physical properties of pure water. In this paper, a first attempt is conducted to predict the heat transfer performance of closed PHP with pure water and available aqueous solutions based on a fully connected feed-forward artificial neural network (ANN). The notable dimensionless numbers, Kutateladze number (Ku), Bond number (Bo), Morton number (Mo), Jackob number (Ja), Prandtl number (Pr), Laplace number (La), d/L e and number of turns (N) were selected as the inputs of the ANN model. It was found that the prediction of proposed ANN model posed a good agreement with experimental data with the MSE and correlation coefficient of 0.026 and 0.979, respectively. For 81.02% of the collected data, the absolute deviation of prediction for thermal resistance was within 25%. For 95% of collected data, the prediction of thermal resistance and temperature difference between the evaporation and condensation section fell within ±0.37 K/W, and ±17.1 K, respectively. The evaluation of evaporation and condensation section temperatures was also presented based on the proposed ANN model.

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Experimental study on effective range of miniature oscillating heat pipes

Cited by 71 publications

References 19 publications

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

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

CFD modeling for thermal performance of Closed Loop Pulsating heat pipe in bottom heated mode

Development of a novel artificial neural network model for closed pulsating heat pipe with water and aqueous solutions

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