Effect of Filling Ratio on Thermal Performance of Closed Loop Pulsating Heat Pipe

Babu, E R; Reddappa, H.N.; Reddy, G. Venkata

doi:10.1016/j.matpr.2018.06.588

Cited by 17 publications

(7 citation statements)

References 7 publications

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“…When heat is dissipated from one loop, the working fluid flows back to the heater to absorb heat and then dissipate heat in the next loop, which is shown to enhance heat transport compared with the single-loop pulsating heat pipe. 35 Heating temperatures ranging from 100°C to 125°C were tested to evaluate the heat pipe's thermal performance in waste heat recovery systems because the temperature of waste gas set in many industrial systems is generally over 100°C to prevent pipeline corrosion induced by water condensation. 36 FR ranging from 50% to 70% were reported to result in the best thermal performance of a pulsating heat pipe, [37][38][39] and hence FR of 50%, 60%, and 70% were evaluated in this study, which had a small effect on the flow pattern, although FR affects the flow characteristics.…”

Section: Resultsmentioning

confidence: 99%

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Squid‐like soft heat pipe for multiple heat transport

Kang

Jiang

Hong

et al. 2022

Droplet

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Soft heat pipes are vital in many applications. Inspired by the structure of a squid, we proposed a squid-like soft heat pipe with multiple heat transport branches that has excellent flexibility and outstanding thermal performance. Each branch could transport heat to different locations for multiple heating or cooling applications.The proposed soft heat pipe worked as a pulsating heat pipe with a unidirectional flow of liquid slugs and vapor bubbles. Its thermal performance was investigated at different heating temperatures, bending angles, and inclination angles. The result showed that the highest equivalent thermal conductivity of the squid-like soft heat pipe could be up to 6750 W/(m · K), almost 17 times that of copper. Besides, the bending angle had little effect on its thermal performance, with the equivalent thermal conductivity reducing 10%-13% when the heat pipe was bent from 0°to 90°. The thermal performance of the soft heat pipe was affected by the inclination angle, with the equivalent thermal conductivity reducing 20%-25% as the inclination angle was reduced from 90°to 30°. The proposed soft heat pipe is scalable by increasing the tube length and branches. It has many promising applications like waste heat recovery, electronic device cooling, personal thermal management, and renewable energy harvesting.

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Section: Resultsmentioning

confidence: 99%

“…Figure 1f shows the inner structure of the proposed heat pipe, where three loops were inner‐connected. When heat is dissipated from one loop, the working fluid flows back to the heater to absorb heat and then dissipate heat in the next loop, which is shown to enhance heat transport compared with the single‐loop pulsating heat pipe 35 …”

Section: Resultsmentioning

confidence: 99%

Squid‐like soft heat pipe for multiple heat transport

Kang

Jiang

Hong

et al. 2022

Droplet

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“…The liquid is transferred owing to the pressure difference between the evaporator and condenser. However, the liquid return in RHP depends on the centrifugal force 236‐290 . There are two types of RHPs; axial RHP and radial RHP.…”

Section: Thermal Management Of Pem Fuel Cells and Gaps In Technologymentioning

confidence: 99%

Factors influencing the performance of PEM fuel cells: A review on performance parameters, water management, and cooling techniques

Singh

Oberoi

Singh

2021

Intl J of Energy Research

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Summary This paper addresses the effects of critical parameters that affect the performance and lifespan of proton exchange membrane (PEM) fuel cells. Amongst all, control of excess water content and dehydration in PEM fuel cells is the major issue under various operating conditions. Therefore, their effects on cathode, anode, gas diffusion layer (GDL), catalyst layer (CL), and flow channels are summarized in the initial part of this paper. Various active cooling strategies such as air cooling, liquid cooling, and phase change method to extract the waste heat from the stack are represented. The lateral part of this paper throws light on the role of heat pipes, working fluid, and the effect of the addition of nanofluid with pertinent filling ratio (FR) in cooling of PEM fuel cells. This work is intended to aid the selection of cooling methods for PEM fuel cells through the consideration of the variety of affecting parameters preceding major expenditure for wide‐scale production. In future, cost comparison associated with the cooling techniques of the fuel cell would be evaluated.

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“…Ling et al [34] experimentally studied the impact of filling ratio on a closed-loop HP system with separated micro-channel evaporator and condenser as a cooling device, showing that the optimal filling ratio was in the range 88-101%. Babu et al [35] studied the thermal performance of a pulsating heat pipe, by CFD simulation and experiments, showing that the filling ratio of 60% led to a smaller thermal resistance. Molan et al [36] experimentally investigated the effect of the filling ratio on the thermal performance of a multi-turn pulsating heat pipe, indicating that the optimal filling ratio may be in the range 48.8-66.1%.…”

Section: Filling Ratio Of the Working Fluidmentioning

confidence: 99%