Experimental investigation of a novel type of two-phase closed thermosyphon filled with functionalized carbon nanotubes/water nanofluids for electronic cooling application

Sardarabadi, Hamideh; Heris, Saeed Zeinali; Ahmadpour, Ali; Passandideh-Fard, Mohammad

doi:10.1016/j.enconman.2019.03.070

Cited by 85 publications

(16 citation statements)

References 47 publications

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“…In the presence of nanoparticles dispersed in the fluid, the vapor bubbles will explode at the first formation moments. Therefore, much smaller vapor bubbles shall be expected for a fluid containing suspended nanoparticles rather than a fluid that does not contain any nanoparticles, which reduces the thermal resistance of TPCT consequently [29][30][31][32][33] . Figure 6 shows the variations in the vacuum pressure drop of operating fluid for each test.…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

“…The surface properties of the thermosyphon interior surfaces, such as wettability and roughness, effect on bubbles formation and, consequently, on thermal resistance in the evaporator and condenser section. Using nanofluids, by increasing thermal conductivity and density of the liquid and decreasing the diameter of the released bubbles, leads to reduce thermal resistance and temperature in the evaporator section 12,24,[29][30] . On the other hand, the reason of increasing temperature in the evaporator section at high input power (90 and 120 W) and low concentrations (0.2 and 0.5 wt.%) can be related to an increase in the number of bubbles at high input power and the inability of the nanofluid to explode these bubbles at low concentrations.…”

Section: O N L I N E F I R S Tmentioning

confidence: 99%

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Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

Chehrazi

Moghadas

2021

JSCS

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Thermosyphons are one of the most efficient heat exchanger apparatus that are used extensively in different industries. One of the most common uses of this device is energy recovery, which is essential due to the energy crisis. Several parameters, such as geometric dimensions, type of working fluid, type of thermosyphon's body, affect a thermosyphon efficiency. In this experiment, the effect of type and concentration of single-walled carbon nanotube nanofluid (SWCNT / Water) on heat transfer efficiency in a two-phase closed thermosyphon (TPCT) has been investigated. For this purpose, a system with a two-phase closed thermosyphon was initially constructed. Then SWCNT/water nanofluids at 0.2, 0.5 and 1 % weight concentration were used as a working fluid in the thermosyphon system. The results of current experiments showed that the addition of nanofluid with any weight concentration and the increase of input power increases the performance of the system. Also, the heat resistance of TPCT reduced when the level of SWCNT and input power increased. So, for prepared nanofluid's samples, minimum thermal resistance obtained at 1 wt.% SWCNT and 120 W. Also, the Nusselt number increased with raising the input power and decreased with increasing the concentration. In all experiments, all prepared nanofluid samples have significantly better thermal performance in comparison with pure water.

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Section: O N L I N E F I R S Tmentioning

confidence: 99%

Section: O N L I N E F I R S Tmentioning

confidence: 99%

Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

Chehrazi

Moghadas

2021

JSCS

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“…On the basis of the experimental results, they found a significant enhancement in CHF while increasing the concentration of nanoparticles and concluded that the optimum concentration was 0.1%, where CHF was maximum. In this point of view, many research studies have been carried out to find a way to enhance the performance and convective heat transfer coefficient using different nanoparticles with water and ethylene glycol as base fluids at varying concentration and particle size 27–33 . Naddaf et al 34 synthesized and investigated the density and viscosity of multiwalled carbon nanotubes (MWCNTs) and graphene nanoplatelets (GNPs) with surfactant oleic acid (OA) and covalent with hexylamine (HA)‐based diesel oil.…”

Section: Introductionmentioning

confidence: 99%

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Tarodiya

Verma

Thangavel³

2021

Heat Trans

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Ground source heat pump (GSHP) systems are well established as an energy‐efficient space conditioning device. However, for better utilization of the ground source, improvement in GSHP performance is desirable, which limits the small temperature difference between the ground and the circulating fluid. In this study, efforts have been made to investigate the performance of a ground heat exchanger (GHX) with a nanofluid as a heat carrier. Mathematical modeling is performed for the closed‐loop vertical U‐tube GHX with six different (Al2O3, CuO, graphite, multiwalled carbon nanotube, graphene, and Cu) water‐based nanofluids. The effect of different operating parameters on GHX length, fluid temperature, and pressure drop with nanofluids is determined. On the basis of the analytical results, it is found that the graphite particle‐based nanofluid plays a prominent role to enhance the performance of the GHX as compared with other nanoparticles. The maximum enhancement in the increase in outlet fluid temperature and reduction in pipe length with graphite particle‐based nanofluid are 68.3% and 63.3%, respectively, for an increase in temperature difference from 7°C to 15°C between the atmosphere and the ground. Also, with the graphite particle‐based nanofluid and the increase in pipe diameter from 20 to 50 mm, the fluid outlet temperature increases up to 11.2%, and the requirement in GHX length reduces up to 55%.

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“…This, in turn, allows for obtaining much better thermal properties in the case of nanofluids rather than colloidal suspensions of microparticles or the base fluids alone. Over the last decades, many scholars focused on the investigation of nanometric particle suspensions [ 10 , 11 , 12 , 13 , 14 , 15 , 16 , 17 , 18 ]. The key issues in nanofluid research are to prepare stable solutions and increase the thermal conductivity of the liquid, without a significant increase in viscosity that could penalize pumping power [ 19 ].…”

Section: Introductionmentioning

confidence: 99%

Few-Layer Graphene-Based Nanofluids with Enhanced Thermal Conductivity

et al. 2020

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High-quality graphene is an especially promising carbon nanomaterial for developing nanofluids for enhancing heat transfer in fluid circulation systems. We report a complete study on few layer graphene (FLG) based nanofluids, including FLG synthesis, FLG-based nanofluid preparation, and their thermal conductivity. The FLG sample is synthesized by an original mechanical exfoliation method. The morphological and structural characterization are investigated by both scanning and transmission electron microscopy and Raman spectroscopy. The chosen two-step method involves the use of thee nonionic surfactants (Triton X-100, Pluronic® P123, and Gum Arabic), a commercial mixture of water and propylene glycol and a mass content in FLG from 0.05 to 0.5%. The thermal conductivity measurements of the three FLG-based nanofluid series are carried out in the temperature range 283.15–323.15 K by the transient hot-wire method. From a modeling analysis of the nanofluid thermal conductivity behavior, it is finally shown that synergetic effects of FLG nanosheet size and thermal resistance at the FLG interface both have significant impact on the evidenced thermal conductivity enhancement.

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Experimental investigation of a novel type of two-phase closed thermosyphon filled with functionalized carbon nanotubes/water nanofluids for electronic cooling application

Cited by 85 publications

References 47 publications

Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

Experimental study of the effect of single walled carbon nanotube/water nanofluid on the performance of a two-phase closed thermosyphon

A study on utilization of ground source energy for space heating using a nanofluid as a heat carrier

Few-Layer Graphene-Based Nanofluids with Enhanced Thermal Conductivity

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