Experimental investigation on thermal performance of closed loop pulsating heat pipes with soluble and insoluble binary working fluids and a proposed correlation

Zamani, Reza; Kalan, Kian; Shafii, Mohammad Behshad

doi:10.1007/s00231-018-2418-z

Cited by 31 publications

(4 citation statements)

References 21 publications

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“…Although each correlation is obtained for a particular PHP and does not give accurate results when used for other PHPs or working fluids, the order of effectiveness of each parameter can be predicted through these correlations. Herein, the correlation presented by Zamani et al 42 is employed to get a better insight into the effect of the thermal properties of the base fluid on the enhancement of the PHP. In this relation, Kutateladze number (Ku) is represented as a function of the Prandtl number (Pr), Jacob number (Ja), Morton number (Mo), and Bond number (Bo).…”

Section: Resultsmentioning

confidence: 99%

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

et al. 2021

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Summary Heat pipes are useful devices in heat transfer and particularly, in cooling systems. Given the high demand for cooling systems in various applications, an improvement in the performance of heat pipes has gained much attraction in recent years. In this study, the effects of utilizing working fluids with different thermal properties on the performance of pulsating heat pipes (PHP) are experimentally studied. Hence, nano‐encapsulated phase change material (NPCM), reduced graphene oxide nanosheets, and their mixture, as a novel hybrid nanofluid, are prepared and dispersed in water as a working fluid. NPCM at 3 concentrations of 5, 10, and 20 g/L, as well as nanosheets at three concentrations of 0.3, 0.6, and 1.2 g/L, are synthesized and investigated. Moreover, both additives are mixed at five various concentrations to form a hybrid nanofluid. All experiments are conducted in the vertical orientation and filling ratio of 50%. It is found that due to the increase in viscosity with the increment of concentration, the highest concentration is not always the optimum concentration and the PHP's performance for each additive is optimized in a specific concentration. NPCMs could prevent the working fluid's temperature to rise by changing the phase, as a result, the effective specific heat of the working fluid is slightly augmented. Also, the thermal conductivity of the working fluid increased up to 13% using nanosheets. It is illustrated that using the mixture of nanosheets and NPCM leads to a 38% decline in thermal resistance. Meanwhile, it is found that the enhancement in the thermal performance of the PHP using nanofluids is not only purely due to the increase in thermal properties of nanofluids but also due to the increase in turbulence intensity and boiling nucleation sites created by the nanoparticles. Highlights Nano‐encapsulated phase change material (PCM), reduced graphene oxide (RGO) nanosheets, and their mixture are used as working fluid in a pulsating heat pipe (PHP). The thermal performance of PHP is improved using PCM nanocapsules, RGO nanosheets, and their mixture. Nanosheets have a higher impact on the performance of PHP compared with nano‐encapsulated PCM. The better performance of PHP using RGO nanosheets is due to the higher thermal conductivity and mixing of fluid containing them compared with pure water. The better performance of PHP using nanocapsules is attributed to the better mixing of the fluid.

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Section: Resultsmentioning

confidence: 99%

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

et al. 2021

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“…(2) Study of non-azeotropic mixtures Theoretical analysis shows that the non-azeotropic immiscible binary mixture can expand the operating temperature range of OHPs [244]. The non-azeotropic immiscible binary mixture can solve the problems of starting temperatures and the drying under the high heat flux of OHPs [245,246], which can improve the heat transfer performance and heat transfer limit of OHPs [247,248]. Future studies can be performed on non-azeotropic mixtures OHPs with different configurations by the analysis of the correlation among profile mixing ratio, filling ratio, and power input.…”

Section: Prospects For Future Researchmentioning

confidence: 99%

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

Xin

Jiang

et al. 2023

Aerospace

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A MCOHP (micro-channel oscillating heat pipe) can provide lightweight and efficient temperature control capabilities for aerospace spacecraft with a high power and small size. The research about the heat flow effects on the thermal performance of MCOHPs is both necessary and essential for aerospace heat dissipation. In this paper, the heat flow effects on the thermal performance of MCOHPs are summarized and studied. The flow thermal performance enhancement changes of MCOHPs are given, which are caused by the heat flow work fluids of nano-fluids, gases, single liquids, mixed liquids, surfactants, and self-humidifying fluids. The use of graphene nano-fluids as the heat flow work medium can reduce the thermal resistance by 83.6%, which can enhance the maximum thermal conductivity by 105%. The influences of gravity and flow characteristics are also discussed. The heat flow pattern changes with the work stage, which affects the flow mode and the heat and mass transfer efficiency of OHP. The effective thermal conductivity varies from 4.8 kW/(m·K) to 70 kW/(m·K) when different gases are selected as the working fluid in OHP. The study of heat flow effects on the thermal performance of MCOHPs is conducive to exploring in-depth aerospace applications.

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“…Zamani et al 109 experimentally studied the effects of different fluids on the thermal performance of closed-loop PHPs. It was found that acetone has a lower vaporization latent heat and boiling point than water, ethanol, hexane, and toluene and has a higher gas production rate even when the heat inputs are equal, which will cause the gas-liquid plug to oscillate faster and lead to a lower thermal resistance.…”

Section: Development Status Of Micro Heat Pipesmentioning

confidence: 99%

A Review of MHP Technology and Its Research Status in Cooling of Li-Ion Power Battery and PEMFC

Chang

et al. 2020

Energy Fuels

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A lithium-ion (Li-ion) power battery and proton exchange membrane fuel cell (PEMFC) have an excellent electrical conversion performance, which makes them a hot spot in the new energy power research field. Electricity is generated inside the battery through an electrochemical reaction, during which time a large amount of heat is also generated. The ideal operating temperature of a Li-ion battery and PEMFC falls into a small range, but the operations require a high temperature uniformity. Efficient cooling technology can be used to timely discharge the heat generated and control the temperature field change inside the battery, thus ensuring the battery's efficient and stable performance. The micro heat pipe (MHP) is currently a more efficient passive cooling equipment with high heat fluxes and a high thermal conductivity through the phase change heat transfer of working fluid. The development and research status of an MHP and its application in the cooling of a Li-ion power battery and PEMFC are reviewed in this paper.

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Experimental investigation on thermal performance of closed loop pulsating heat pipes with soluble and insoluble binary working fluids and a proposed correlation

Cited by 31 publications

References 21 publications

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

The impacts of utilizing nano‐encapsulated PCM along with RGO nanosheets in a pulsating heat pipe, a comparative study

A Review of Working Fluids and Flow State Effects on Thermal Performance of Micro-Channel Oscillating Heat Pipe for Aerospace Heat Dissipation

A Review of MHP Technology and Its Research Status in Cooling of Li-Ion Power Battery and PEMFC

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