A comparative investigation on the effect of fly-ash and alumina nanofluids on the thermal performance of two-phase closed thermo-syphon heat pipes

Sözen, Adnan; Menlik, Tayfun; Gürü, Metin; Boran, Kurtuluş; Kiliç, Faruk; Aktaş, Mustafa; ÇAKIR, Mutlu Tarık

doi:10.1016/j.applthermaleng.2015.11.038

Cited by 37 publications

(13 citation statements)

References 27 publications

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“…The fly ash nanofluid is composed of various metal oxides in different ratios (like hybrid composite). The enhancement in thermal conductivity might also be due to the presence of various metal oxides—a contribution of amorphous structure 7,8 of the fly ash nanoparticles. At all temperatures, the increase in the volume concentration improves the thermal conductivity of nanofluid by a similar trend.…”

Section: Resultsmentioning

confidence: 99%

“…Sözen et al 7 showed that fly ash nanofluid in parallel flow improved heat exchanger efficiency experimentally by 34%. In another study, Sözen et al 8 investigated how fly ash and alumina nanofluids affect the thermal efficiency of a closed two‐phase thermosyphon heat pipe at various operating states. By using fly nanofluid to replace water with 400 W heating power and a 5‐g/s coolant water flow rate, they recorded a 30% decrease in thermal resistance.…”

Section: Introductionmentioning

confidence: 99%

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Stability and thermophysical properties of fly ash nanofluid for heat transfer applications

Kanti¹,

Sharma

Ramachandra

et al. 2020

Heat Trans

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Improving the performance of heat transfer fluids is altogether significant. The best approach for improving the thermal conductivity is the addition of nanoparticles to the base fluid. In the present study, specific heat, dynamic viscosity, and thermal conductivity of water-based Indian coal fly ash stable nanofluid for 0.1% to 0.5% volume concentration in the temperature range of 30 to 60°C has been investigated. To evaluate an average particle diameter of 11.5 nm, the fly ash nanoparticles were characterized with scanning electron microscopy and dynamic light scattering. Using zeta potential, the stability of nanofluid in the presence of surfactant Triton X-100 was tested. Thermal conductivity and viscosity of fly ash nanofluid increased, while specific heat decreased as volume concentration increased. The effect of temperature on the fly ash nanofluid was directly proportional to its thermal conductivity and specific heat and inversely proportional to viscosity.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Stability and thermophysical properties of fly ash nanofluid for heat transfer applications

Kanti¹,

Sharma

Ramachandra

et al. 2020

Heat Trans

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“…Water-Al2O3 + surfactant performed better than pure water, an increase was observed for the collector compared to pure water and nanofluids, and the increase was 20% compared to water. Sözen et al [93] used nanofluids and fly ash as working fluids in the system. In the study, the effects of nanofluids and fly ash on the performance of a closed thermosiphon heat pipe were investigated.…”

Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

“…[92] 2016 Al2O3-H2O The increase in performance compared to water was found to be 20%. [93] 2016 H2O, alumina nanofluid and fly ash…”

Section: Nanofluid Applications In Heat Pipe Solar Collectorsmentioning

confidence: 99%

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Ünvar

Menlik

2021

Politeknik Dergisi

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The importance of using solar energy, one of the renewable energy sources, has started to be understood more recently. The negative environmental effects and limited amounts of fossil fuels have led to increased demand for renewable energy sources worldwide and the production of various models and devices has accelerated to take advantage of solar energy, which is the basis of all energy sources. Using solar collectors as a way to benefit from solar energy has been used for many years. Although solar collectors are generally divided into 4 types as flat plate (FPSC), evacuated tube (ETSC), parabolic (PSC) and heat pipe (HPSC), these types can also be divided into separate types with many different features. The most commonly used solar collector type in the world is Flat Plate Solar Collector. The most important reasons for this are being cheap, easily produced and applied in various ways. Yet, the thermal productivity of FPSCs decreases below 40% in non-ideal climate conditions with low surrounding temperature. The existence of such disadvantages of FPSCs led to the production of Evacuated Tube Solar Collectors. With the advancing technology, the utilization of heat pipes in collectors has come to the agenda and as a result of the studies conducted, it has been determined that the use of heat pipe improves efficiency. In addition, the use of nanofluids in solar collectors and heat pipes has become quite common, and many studies have been carried out especially on this subject recently. The primary objective is always to improve the performance of the system and achieve efficiency. In this way, solar energy will be used in the most effective way and world energy supply demand will be met by using renewable resources.

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“…Heat pipe that is a compact and effective heat exchanger includes microchannel heat pipe, mesh wick heat pipe, sintered core heat pipe, oscillating heat pipe and thermosyphon heat pipe, and other heat pipe forms [31]. The researchers conducted experimental studies on different types of nanofluids such as Al 2 O 3 [32,33], CuO [34,35], SiO 2 [36,37], Fe 2 O 3 [38,39], and graphene nanosheets [40][41][42] in heat pipes. The results indicated that nanofluids can enhance heat transfer of the heat pipes.…”

Section: Nanofluid Application In Heat Pipesmentioning

confidence: 99%

Effect of Nanofluids on Boiling Heat Transfer Performance

Yao

Teng

2019

Applied Sciences

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At present, there are many applications of nanofluids whose research results are fruitful. Nanofluids can enhance the critical heat flux, but the effect on boiling heat transfer performance still has disagreement. Base liquids with higher viscosity improve the boiling heat transfer performance of nanofluids. When the base liquid is a multicomponent solution, the relative movement between the different solutions enhances the microscopic movement of the nanoparticles due to the different evaporation order during the boiling process, so that the boiling heat transfer performance is enhanced. Compared with the thermal conductivity of the heated surface, the deposition of the low thermal conductivity nanoparticles reduces the heat dissipation rate of the heated surface and improves the wall superheat. Then the enhancement of the boiling heat transfer coefficient should be attributed to the thermal conductivity improvement of base fluid and the bubble disturbance resulted from the nanoparticle’s microscopic motion.

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A comparative investigation on the effect of fly-ash and alumina nanofluids on the thermal performance of two-phase closed thermo-syphon heat pipes

Cited by 37 publications

References 27 publications

Stability and thermophysical properties of fly ash nanofluid for heat transfer applications

Stability and thermophysical properties of fly ash nanofluid for heat transfer applications

Güneş Kolektörlerinde Nanoakışkanların Kullanılmasının Etkileri

Effect of Nanofluids on Boiling Heat Transfer Performance

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