Heat transfer enhancement studies in pool boiling using hybrid nanofluids

Yagnem, Anil Reddy; Venkatachalapathy, S.

doi:10.1016/j.tca.2018.11.014

Cited by 54 publications

(12 citation statements)

References 30 publications

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“…For the maximum concentration, the thermal conductivity was 0.9 W/mK at 70°C and the efficiency was 66% which is 10% higher than that of water. The thermal conductivity of Al 2 O 3 -CuO hybrid nanofluids was reported by Yagnem and Venkatachalapathy [13]. The concentration of nanofluid varied from 0.01 to 0.1%.…”

Section: Introductionmentioning

confidence: 78%

Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage

Kalidoss

Venkatachalapathy

Suresh

2020

International Journal of Photoenergy

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The present experimental study focuses on the energy storage performance of Therminol 55-TiO2 nanofluids for the absorption of solar energy. Photothermal conversion efficiency is enhanced using Fresnel lens and secondary reflectors with a glass-type evacuated absorber tube. The focal length of the Fresnel lens is 150 mm, and that of the secondary reflector is 70 mm. The optical absorbance, extinction coefficient, and thermal conductivity of nanofluids at 100, 250, 350, and 500 ppm are reported. The optical path length of the energy storage medium is 1 cm. The optical performance of the nanofluids is analyzed in the range of 400 to 800 nm. Compared to base fluid, the prepared concentrations show higher absorbance in the measured range of wavelength. The optimum concentration is found to be 250 ppm, and its specific heat is measured in the temperature range of 27 to 117°C and is found to vary from 1.85 to 2.19 J/g °C. The thermal conductivity of the maximum concentration of nanofluid is 0.134 W/mK. The optical absorbance test confirms the stability of nanofluids. Maximum temperature and photothermal conversion efficiency are obtained.

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Section: Introductionmentioning

confidence: 78%

Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage

Kalidoss

Venkatachalapathy

Suresh

2020

International Journal of Photoenergy

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“…Moreover, nanoparticles can include diverse materials such as metals with chemical stability (copper, silver, gold), metal oxides (alumina, titania, silica, zirconia, bismuth oxide), carbon allotropes (diamond, fullerene, single-walled and multi-walled carbon nanotubes), as well as functionalized nanoparticles [19][20][21][22][23]. Even hybrid nanoparticles and nano-fluids can be used for heat transfer [24] and pool boiling enhancement [25,26]. Thus, it can be inferred that the CHF is enhanced by the modification of fluid properties through adding various particles to the base fluids [27,28].…”

Section: Chf Enhancement By Ameliorating Fluid Properties With Nanoparticlesmentioning

confidence: 99%

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

et al. 2020

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Pool boiling is an effective heat transfer process in a wide range of applications related to energy conversion, including power generation, solar collectors, cooling systems, refrigeration and air conditioning. By considering the broad range of applications, any improvement in higher heat-removal yield can ameliorate the ultimate heat usage and delay or even avoid the occurrence of system failures, thus leading to remarkable economic, environmental and energy efficiency outcomes. A century of research on ameliorating critical heat flux (CHF) has focused on altering the boiling surface characteristics, such as its nucleation site density, wettability, wickability and heat transfer area, by many innovative techniques. Due to the remarkable interest of using nanoparticle deposition on boiling surfaces, this review is targeted towards investigating whether or not metal oxide nanoparticles can modify surface characteristics to enhance the CHF. The influence of nanoparticle material, thermo-physical properties, concentration, shape, and size are categorized, and the inconsistency or contradictions of the existing research results are recognized. In the following, nanoparticle deposition methods are presented to provide a worthwhile alternative to deposition rather than nanofluid boiling. Furthermore, possible mechanisms and models are identified to explain the amelioration results. Finally, the present status of nanoparticle deposition for CHF amelioration, along with their future challenges, amelioration potentials, limitations, and their possible industrial implementation, is discussed.

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“…Said et al (2017) reported that the density of nanofluid was measured using Density Metre DA-130N [65]. The density of nanofluids and hybrid nanofluids are estimated using the following equations [66].…”

Section: Densitymentioning

confidence: 99%

“…By adding small amount of the nanoparticles, specific heat capacity values of nanofluids can be modified significantly [89]. The specific heat capacity of nanofluids can be measured from equations and also by a differential scanning calorimeter [90], [66].…”

Section: Specific Heat Capacitymentioning

confidence: 99%

A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

Chen¹,

Oumer²,

Aziz³

2019

JMES

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The pressure drop and thermal performance of various nanofluids can be affected by their thermo-physical properties. However, there are many different parameters that need to be considered when determining the thermo-physical properties of nanofluids. This paper highlights a detail reviews on the thermo-physical properties of nanofluids with different material type and effect of some process parameters (such as material type, temperature and concentration) on the thermo-physical properties of nanofluids. Four thermo-physical properties mainly density, viscosity, thermal conductivity and specific heat capacity from different literatures were summarized, discussed and presented. The lowest viscosity value of nanofluids in literature was mango bark water-based nanofluid (0.81cP). On the other hand, the maximum thermal conductivity value of nanofluids in the literature was GNP-Ag water-based nanofluid (0.69W/mK). The density and specific heat capacity are strongly dependent on the material type. Meanwhile, the viscosity and thermal conductivity are greatly affected by temperature and concentration. The most influential parameters on thermo-physical properties of nanofluids are material type followed by temperature. Most of the literatures confirmed bio nanofluids have low viscosity value and hybrid have high thermal conductivity values.

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Heat transfer enhancement studies in pool boiling using hybrid nanofluids

Cited by 54 publications

References 30 publications

Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage

Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

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Heat transfer enhancement studies in pool boiling using hybrid nanofluids

Cited by 54 publications

References 30 publications

Optical and Thermal Properties of Therminol 55-TiO2 Nanofluids for Solar Energy Storage

Optical and Thermal Properties of Therminol 55-TiO2 Nanofluids for Solar Energy Storage

Recent Advances in the Critical Heat Flux Amelioration of Pool Boiling Surfaces Using Metal Oxide Nanoparticle Deposition

A review on thermo-physical properties of bio, non-bio and hybrid nanofluids

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Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage

Optical and Thermal Properties of Therminol 55-TiO₂ Nanofluids for Solar Energy Storage