Operation performance of thermosyphons employing titania and gold nanofluids

Grab, Thomas; Groß, Ulrich; Franzke, U.; Buschmann, Matthias

doi:10.1016/j.ijthermalsci.2014.06.019

Cited by 37 publications

(22 citation statements)

References 12 publications

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“…enhanced thermal properties of nanofluids, nanoparticle interaction with the heater surface, and altered boiling process [1,2,31]. It was confirmed that nanofluids do not affect the thermal behaviour of the condenser [5,6].…”

Section: Two-phase Closed Thermosyphon (Tpct)mentioning

confidence: 99%

“…They potentially overcome the greatest limitation of the base liquid (i.e. low thermal conductivity in comparison with solids) and thus allow for the development of high-performance heat transfer fluids [1,2,5,6]. Most of the research on nanofluids focused on the heat transfer, pressure drop, and energy analysis [1,2,[7][8][9][10][11][12][13][14][15].…”

Section: Introductionmentioning

confidence: 99%

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Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Wlaźlak

Zajączkowski

Woluntarski

et al. 2018

J Therm Anal Calorim

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The paper presents a thermal performance analysis of a thermosyphon filled with graphene oxide nanofluid. It focuses on factors influencing thermal resistance and geyser boiling processes, such as the presence of surfactant (here: sodium dodecyl sulphate), the time-related deterioration of nanoparticles, and working conditions. Results indicate that GO nanofluids improved heat transfer at low heat loads and that enhancements were limited to the evaporator section. Although thermal resistance of the device was similar for all tested working fluids at high evaporator temperatures, the timedependent behaviour was different. Both water and GO nanofluid facilitated geyser boiling. Sodium dodecyl sulphate inhibited the phenomenon for pure water, but the same concentration of surfactant in the graphene oxide nanofluid did not show the same effect. SEM analysis showed that substantial amount of surfactant attached to the surface of graphene oxide flakes, which explains the previously described behaviour.

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Section: Two-phase Closed Thermosyphon (Tpct)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Wlaźlak

Zajączkowski

Woluntarski

et al. 2018

J Therm Anal Calorim

Self Cite

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“…The first research about the application of nanofluids in heat pipe was published by Chien et al [9].Since then; many articles about different types of heat pipe using nanofluids have been published. One of the most important results of these studies [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20], is an increase in the maximum heat load and decrease in the thermal resistance in heat pipe. Maryam Shafahi et al [3,10], showed that the use of nanofluids in the flat-shaped heat pipe and cylindrical heat pipe decreases the temperature difference along the heat pipe, and reduces the speed of the liquid, and also it provides the possibility of reduction in heat pipe size under the same condition.…”

Section: Main Effects Of Nanofluids On Heat Pipesmentioning

confidence: 99%

“…[14,15,12]. Grab et al [11] concluded that only extraordinarily small portion of the nanoparticles suspended in the working fluid is transported by the vapor phase. Therefore, a deposition of nanoparticles on the condenser surface seems rather unlikely.…”

Section: Main Effects Of Nanofluids On Heat Pipesmentioning

confidence: 99%

Nanofluids and heat pipe limitations

Mekcem¹

2018

acperpro

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Given the high efficiency of heat pipes as heat transfer devices, which work with phase changing principle (evaporation and condensation) and without requiring any external energy input, the heat pipes have been utilized for many years in several areas. However, heat transfer in heat pipes is limited by physical phenomena which appear during its operation, called heat pipe limitations; these can limit and reduce its performance. At this state, the use of nanofluids instead of conventional fluids come a solution after that Choi and Eastman (1995) confirmed the feasibility of enhancing the thermal conductivity of fluids by adding nanoparticles. This paper represents a general description of heat pipes, including a brief historical perspective, principle of operation and explanation of main heat transfer limitations. The work shows the contribution of nanofluids in pushing back the heat transfer limitations

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“…Recent studies on heat pipes established the fact that the addition of nanoparticles in the working fluid would impart significant improvement in thermal performance and, hence, energy efficiency. Typical nanoparticles considered are alumina, copper and its oxides, gold, silver, titanium oxides, zinc oxide, graphene, or hybrid nanoparticles 12‐17 . Gupta et al 18 made an extensive review of the heat transfer aspects linked with the application of nanofluids in heat pipes.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance enhancement studies using graphite nanofluid for heat transfer applications

2020

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Enhanced boiling heat transfer using nanofluids is highly relevant due to its potential applications in thermal management of systems producing large heat fluxes. However, the sedimentation of nanoparticles limits their application in heat transfer systems. So, the preparation of a stable nanofluid remains a big research challenge. The stability issues arise due to the large difference in the density of nanoparticle and the base fluid. Graphite nanoparticle is selected in this study, as it has 4.5 times lower density than copper and comparable thermal conductivity. An experimental study is conducted to evaluate the suitability of graphite nanofluid in mesh wick heat pipes, which are devices that utilize boiling and condensation principles to transfer high heat fluxes. Thermal transport properties and boiling heat transfer characteristics showed enhancement and the effect of nanofluid on the device level thermal performance is thoroughly assessed. Experimental results are compared with the published literature. A reduction in thermal resistance by 32.5% and an improvement in the heat transfer coefficient by 48.02% in comparison with base fluid clearly indicate the superiority of the graphite nanofluid for heat transfer applications.

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Operation performance of thermosyphons employing titania and gold nanofluids

Cited by 37 publications

References 12 publications

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Influence of graphene oxide nanofluids and surfactant on thermal behaviour of the thermosyphon

Nanofluids and heat pipe limitations

Thermal performance enhancement studies using graphite nanofluid for heat transfer applications

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