An overview on the developing trend of pulsating heat pipe and its performance

Bastakoti, Durga; Zhang, Hongna; Li, Da; Cai, Weihua; Li, Feng‐Chen

doi:10.1016/j.applthermaleng.2018.05.121

Cited by 132 publications

(36 citation statements)

References 128 publications

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“…The stronger surface tension forces helped the two-phase flow and formed natural separation of liquid slugs and vapor plugs during operation [24]. Bastakoti et al [66] suggested that if r h ≥ r hmax , the effect of the surface tension is reduced and the working fluid will be stratified by gravity and oscillatory motion will cease. The thermal resistance of 5 × 5 mm 2 square channels showed high value at the heat load of 100 W because the pressure fluctuation at heat source and heat sink became small with reduction of oscillatory motion of working fluid.…”

Section: Resultsmentioning

confidence: 99%

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

Mehta

Mehta²,

Patel

2020

J Braz. Soc. Mech. Sci. Eng.

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The closed-loop flat-plate oscillating heat pipe (CL-FPOHP) is a new two-phase heat transfer device for an effective thermal management in different systems. A number of theoretical and experimental investigations have been carried out on the CL-FPOHP in the past decades after its invention. However, due to the operational mechanism of the CL-FPOHP, the effects of channel profile on the thermal resistance have not been completely revealed so far. This paper aims at discussing the thermal resistance and thermal conductivity by changing the shape and size of the CL-FPOHPs channel. The thermal resistances of the CL-FPOHPs were investigated by varying the channel shape from square to circular, channel sizes from 2 × 2 mm 2 to 5 × 5 mm 2 , and heat load from 10 to 120 W. The pure copper was used to develop the CL-FPOHP and charged with the acetone with a charge ratio of 70%. The most suitable channel shape for the CL-FPOHP was found to be a square channel, and the most suitable channel size was observed to be 2 × 2 mm 2. The highest thermal conductivity of the CL-FPOHP reached to 2137 W/m °C. Keywords Flat-plate oscillating heat pipe • Two-phase heat transfer • Thermal resistance • Channel profile List of symbols Bo Bond number, g(l − v) r h 2 g Gravitational force (m/s 2) l Liquid density (kg/m 3) Subscripts CL-FPOHP Closed-loop flat-plate oscillating heat pipe FPOHP Flat-plate oscillating heat pipe TOHP Tubular oscillating heat pipe e Evaporator c Condenser l Liquid v Vapor W Watt L Distance of the two centers of the evaporator and condenser A Total cross-sectional area of CL-FPOHP

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Section: Resultsmentioning

confidence: 99%

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

Mehta

Mehta²,

Patel

2020

J Braz. Soc. Mech. Sci. Eng.

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“…Several researchers are performing investigations on non-conventional operating fluids, like nano-fluids (Qu et al, 2010;Aly, 2014), refrigerants (Wang and Jia, 2016;Nazari et al, 2018), inert gases (Spinato et al, 2016) and ionic fluids (Fonseca et al, 2015), surfactant solution (Bastakoti et al, 2018b;Liang et al, 2018), etc., to find novel operating fluids which might enhance the operational performance of PHP. Regarding on surfactant solutions, Liang et al (2018) conjointly discovered thermal performance of PHP with sodium stearate surfactant chemical agent solutions which have better performance results compared with pure water yielded.…”

Section: Introductionmentioning

confidence: 99%

“…Regarding on surfactant solutions, Liang et al (2018) conjointly discovered thermal performance of PHP with sodium stearate surfactant chemical agent solutions which have better performance results compared with pure water yielded. Also, Bastakoti et al (2018b) performed experimental investigation where cetyltrimethyl ammonium chloride, C 19 H 42 ClN (CTAC), surfactant chemical agent's solution was thought as the operating fluid. The lower surface tension of CTAC resolution is believed to be the rationale behind the yielding of better thermal performance of PHP at completely different operational conditions compared to de-ionized (DI) water.…”

Section: Introductionmentioning

confidence: 99%

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Visualization of bubble mechanism of pulsating heat pipe with conventional working fluids and surfactant solution

Basatakoti

Zhang

et al. 2019

Exp. Comput. Multiph. Flow

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Visualization experiment is a must in realizing functional characteristics of an operational pulsating heat pipe (PHP). So far there is no general formulation which can foretell the complex and chaotic flow nature for every working fluid. Different response of working fluids and their distinct flow nature as well as their behavior can be visualized which thereby helps to understand the operational mechanism of the PHP. In this experiment, tests were conducted in a transparent PHP with 3 conventional working fluids, viz. de-ionized (DI) water, methanol, ethanol, and 300 ppm cetyltrimethyl ammonium chloride (CTAC) solution, each with fill ratio (FR) of 50%. With the help of high speed camera, flow characteristics at different operational stages for each working fluid are captured. Difference in the generation, growth, movement, and flow direction of bubbles are observed and the consequence of combined effects of various thermal properties of the fluid rather than a dominating single property. Start-up characteristics and dominating flow pattern for each fluid are reported in this paper. Moreover, peculiar flow characteristics with 300 ppm CTAC like bubble detachment, movement of cluster of micro-bubbles, and swirling are also presented.

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“…A pulsating heat pipe (PHP) is a passive thermal management system that works on the balance of the phases of the working fluid within it. The research on the device itself and its physics has been currently going on and the possible applications are numerous, such as in space technology and automotive industry [1]. It is known, however, that the device is very efficient in transporting heat [2].…”

Section: Introductionmentioning

confidence: 99%

Design of manufacturing simulations of a flatplate pulsating heat pipe

Pontecorvo¹

2019

13th Research and Education in Aircraft Design: Conference Proceedings

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Currently, a research team in the University of Brighton, in collaboration with the European Space Agency (ESA), is developing a pulsating heat pipe that will eventually be launched and tested in space, with the International Space Station (ISS) as destination, for research into passive thermal devices and their behaviour in a vacuum.The approved pulsating heat pipe design incorporates one titanium plate, which is classified as a metal, and one aluminum-oxide sapphire plate that is classified as a ceramic. At the moment, the team is faced with the challenge of bonding the two plates together since, using convectional manufacturing methods, the parts fail due to the high level of induced stress. A research into manufacturing processes to bond together titanium and sapphire is essential to ensure that the final device will operate for several weeks (maybe even months) without leaking and the need for maintenance. The project explores potential manufacturing processes aimed to bond together these materials and subsequently propose a solution. Furthermore, static and thermal analyses are carried out with the aid of SolidWorks to exploit potential points of failure due to stress concentrations induced by cooling after bonding.The results indicate that both titanium and sapphire are capable of sustaining the induced stresses but, due to the complex geometry of the pulsating heat pipe at the contact surface, the bonding agent is likely to fail due to the induced stresses.

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An overview on the developing trend of pulsating heat pipe and its performance

Cited by 132 publications

References 128 publications

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

Influence of the channel profile on the thermal resistance of closed-loop flat-plate oscillating heat pipe

Visualization of bubble mechanism of pulsating heat pipe with conventional working fluids and surfactant solution

Design of manufacturing simulations of a flatplate pulsating heat pipe

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