An influence of Al2O3 nanoparticles on the caloric properties and parameters of the phase transition of isopropyl alcohol in solid phase

Zhelezny, Vitaly; Motovoy, Igor; Khliyeva, Olga; Лукьянов, Николай Николаевич

doi:10.1016/j.tca.2018.11.020

Cited by 14 publications

(7 citation statements)

References 18 publications

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“…Measurements of the two-phase isochoric heat capacity for all objects of the study were conducted by a monotonic heating method. The scheme of a lowtemperature adiabatic calorimeter and details of the performed experiment are reported in the work performed [15]. The technique of experimental data processing is presented in [9].…”

Section: Experimental Methodsmentioning

confidence: 99%

An experimental study of Al2O3 nаnoparticles influence on caloric properties of propylene glycol based coolants

Motovoy

Artemenko

Khliyeva

et al. 2020

EEJET

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Нанофлюїди є перспективними теплоносіями, застосування яких сприяє підвищенню загальної ефективності енергетичних систем. Основною перепоною на шляху практичного застосування нанотеплоносіїв на основі водних розчинів пропілен гліколю є відсутність точних даних з їхніх тепло фізичних властивостей. В роботі виконано експе риментальне дослідження (методом адіабатної калориметрії) теплоємності та параметрів фазо вих перетворень тверда фаза -рідина пропілен гліколю та теплоносія на основі водного розчи ну пропіленгліколю. Виконано експериментальне дослідження теплоємності рідкої фази теплоносія на основі водного розчину пропіленгліколю з доміш ками наночастинок Al 2 O 3 (до 2,01 мас. %) в інтер валі температур 235…338 K та пропіленгліколю з домішками наночастинок Al 2 O 3 (1,03 мас. %) у інтервалі температур 268…335 K. Виконано зіставлення температурної залеж ності ефективної теплоємності теплоносіїв зі змі ною їхньої внутрішньої структури. Показано, що додавання води до пропіленгліколю збільшує тем пературу і теплоту фазового переходу тверда фаза -рідина (теплота фазового переходу пропі ленгліколю складає 37,85 Дж•г -1 , теплоносія про піленгліколь/вода (54/46 мас. %) -77,97 Дж•г -1 ). Показано, що домішки наночастинок Al 2 O 3 , як в пропіленгліколі, так і в теплоносії на основі вод ного розчину пропіленгліколю, сприяють зменшен ню теплоємності рідини. Теплоємність зменшуєть ся приблизно пропорційно зростанню концентрації наночастинок. Ефект зменшення теплоємності про являється у більшій мірі при високих темпера турах (на 3,9 % при 265 K та на 5,0 % при 325 K для нанотеплоносія з концентрацією наночастинок Al 2 O 3 2,01 мас. %). Отримані результати покращать якість проек тування теплообмінного обладнання з застосуван ням нанотеплоносіїв. Результати є корисними для розробки методів прогнозування питомої теплоєм ності нанофлюїдів Ключові слова: теплоносій, пропіленгліколь, нано частинки, калоричні властивості, теплоємність, фазовий перехід, температура плавлення, адіа батний калориметр

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Section: Experimental Methodsmentioning

confidence: 99%

An experimental study of Al2O3 nаnoparticles influence on caloric properties of propylene glycol based coolants

Motovoy

Artemenko

Khliyeva

et al. 2020

EEJET

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“…The authors [21] measured the diffusion of tin in copper at a temperature of 1000 0 С and established the ratio between the volume diffusion coefficient ‫ܦ‬ ௩ and the boundary diffusion coefficient ‫ܦ‬ ௦ : 5 8 10…”

Section: Properties Of Nanoparticlesmentioning

confidence: 99%

“…The use of nanomaterials in solar cells allows to obtain up to 80% of the energy of sunlight while existing solar cells can only use 20% [7]. The addition of nanoparticles to liquids improves thermal conductivity [8] and heat transfer [9].Additive manufacturing (3D printing) provides new opportunities in the manufacture of ultralight components and machine parts using nanopowders [10].Significant achievements in optics, electronics and computer technology are determined by the use of nanoparticles [11]. It is assumed that by the middle of the 21st century, nanotechnology will have been used in all spheres of human activity.…”

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confidence: 99%

Properties and behavior of nanoparticles

Kiriian

Kozytskyi²

2022

ФАС

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The methods of obtaining nanomaterials have been described, and the conditions for the formation of nanoparticles of a given size have been assessed. It has been shown that the surface energy of the nano-sized particles, due to a large portion of surface atoms, is significantly greater than the surface energy of the microparticles resulting in the non-equilibrium state of the former with the possibility to self-organize forming, in particular, strong and wear-resistant cladding films from the metallic nanoparticles on the friction surfaces. To explain the interaction of the nanoparticles, which are at the boundary of the quantum and classical states, with the environment, the main provisions of quantum mechanics have been used. The mutual interaction between the bare nanoparticles and between the nanoparticle and a surface, separated by the environment, has been considered. It has been shown that without the stabilization with surfactants, metallic nanoparticles will aggregate; in turn, the nature of the interaction between the nanoparticles with the solid substrates is determined by their dielectric constants. The paper presents an overview of the development of the nanotechnology industry, indicates the commercial demand for nanomaterials, marks the countries that are leaders in the production of nanomaterials, and lists the mainelements used for the production of metallicnanopowders.

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“…A 4.3 % and a 5.9 % decrement in the latent heat of melting and freezing, correspondingly, was observed when adding CuO nanoparticles in PW and a little bit less when adding Al 2 O 3 nanoparticles -2.2 % and 3.7 %, respectively. It should be noted that a decrease in the heat capacity and changes in the melting heat due to the presence of nanoparticles in the liquid and solid phases of substances are mentioned in some studies [13,14]. Such changes can be considered as a negative factor for nanostructured substances that are promising as thermal storage PCMs.…”

Section: Literature Review and Problem Statementmentioning

confidence: 99%

The effect of metal wool on the charging and discharging rate of the phase transition thermal storage material

Khliyeva¹,

Zhelezny²,

Paskal³

et al. 2021

EEJET

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Thermal energy storage (TES) plays an important role in solar heat power systems. The use of phase change materials (PCM) and selecting additives to increase the rate of heat accumulation is a promising way to increase the efficiency and reliability of such systems. The objects of the study were pure paraffin wax (PW) and composite PCMs based on it (containing aluminum and copper wool of 30 and 45 μm in diameter, respectively). An experimental setup with a cylindrical measuring cell was created, which was also considered as a model of a capsule with a thermal storage material. The rate of temperature change in the pure PW sample and samples of composite PCMs was experimentally measured. Two modes of heating and cooling were investigated: from 48 to 59 °C (mode with a phase change) and from 30 to 40 °C (mode without phase changes). Heating time from 48 to 59 °C for the PW sample was 13 min., for the PW samples with the content of aluminum wool of 0.00588 and 0.01780 m3·m-3 − 11 and 10.5 min., for the PW samples with the content of copper wool of 0.00524 and 0.01380 m3·m-3 − 11 and 8 min., correspondingly. The minimum heating time from 30 to 40 °C was 6 min. for the sample of PW with 0.01380 m3·m-3 of copper wool in comparison with 9 min. for the sample of pure PW. The expediency of using copper wool as an additive to thermal storage materials of PW to increase the charging and discharging rate of TES devices without significantly raising their price was confirmed. The presence of metal wool in molten PW suppresses bottom-up convective currents, so the main mechanism of heat transfer is thermal conductivity. This fact will contribute to a faster equalization of the temperature field by the height of heat storage capsules

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An influence of Al2O3 nanoparticles on the caloric properties and parameters of the phase transition of isopropyl alcohol in solid phase

Cited by 14 publications

References 18 publications

An experimental study of Al2O3 nаnoparticles influence on caloric properties of propylene glycol based coolants

An experimental study of Al2O3 nаnoparticles influence on caloric properties of propylene glycol based coolants

Properties and behavior of nanoparticles

The effect of metal wool on the charging and discharging rate of the phase transition thermal storage material

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