Pool Boiling Heat Transfer Characteristics of New and Recycled Alumina Nanofluids

Ajeeb, Wagd; Murshed, S. M. Sohel

doi:10.3390/nano13061040

Cited by 4 publications

(6 citation statements)

References 46 publications

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“…The mixture of EG/DW base fluid was selected as it is widely used in various cooling and heating applications [26,60,61]. EG/DW mixtures can result in special advantages for the prepared NFs considering their freezing and boiling points, which are significant for industrial heat transfer purposes [26,62]. The samples were prepared by dispersing five low concentrations from 0.01 to 0.05 vol.% of each type of NP into the EG/DW base fluid.…”

Section: Nanofluids Preparation and Experimental Proceduresmentioning

confidence: 99%

Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids

Ajeeb

Murshed

2023

Energies

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Experimental data associated with the thermophysical properties (TPPs) of various nanofluids (NFs) are essential for their diverse applications in energy storage and conversion, as well as thermal management. This study experimentally investigated important TPPs such as thermal conductivity (TC), thermal diffusivity, density and viscosity, as well as the electrical conductivity of two new types of NFs, namely silica (SiC) and boron nitride (BN) nanofluids. The NFs are prepared at five low concentrations of nanoparticles from 0.01 to 0.05 vol.% dispersed into a mixture of ethylene glycol (EG) and distilled water (DW). The TPPs are measured, and their enhancements are evaluated in comparison with their base fluids. The results show a good increase in TC and thermal diffusivity for both types of nanofluids with increasing concentrations until reaching the maximum enhancement of about 4.4% for the SiC nanofluid and about 7.0% for the BN nanofluid at the same concentration (0.05 vol.%). On other hand, a Newtonian rheological behaviour is observed, and viscosity and density are also found to increase for both types of NFs, where the maximum increase in viscosity and density at 0.05 vol.% are found to be 5.2% and 0.3%, respectively. The electrical conductivity also increases by up to 3.2 times for SiC nanofluids and 2.8 times for BN nanofluids at the maximum concentration of these nanoparticles (0.05 vol.%) compared with the base fluid (EG/DW). The overall evaluation of the obtained results demonstrates the great potential of these nanofluids in heat transfer applications.

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Section: Nanofluids Preparation and Experimental Proceduresmentioning

confidence: 99%

Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids

Ajeeb

Murshed

2023

Energies

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“…The thermophysical properties of the nanofluids (subscript n f ) are very often derived based on the properties of the nanoparticles (subscript s ) and of the base fluid (subscript b f ) at the mean bulk temperature, i.e., T f ,ave [31,[34][35][36]. The density of the nanofluid ρ n f (effective density) can be estimated using Equation (12), which is based on mixing theory:…”

Section: Thermophysical Properties Of the Nanofluidsmentioning

confidence: 99%

“…Nevertheless, inconsistencies in research findings postpone their adoption in the industrial sector. Additionally, some other practical challenges, i.e., stability in the long term [6], material wear [7][8][9][10], clogging [11], or recycling and reusability [12] stand against their commercialization. Furthermore, the pressure drop should also be taken into account to have a fair evaluation of the performance improvement.…”

Section: Introductionmentioning

confidence: 99%

Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels

Eneren,

Aksoy,

Vetrano

2023

Energies

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Despite numerous studies on nanofluids in microchannel heat sinks (MCHSs), they are not yet commercialized due to long-term stability issues and high maintenance costs. Therefore, this study explores the impact of nanofluids and nanoparticle clustering on single-phase convective heat transfer inside microchannels under laminar conditions. Water and commercially available water-based nanosuspensions, including Al2O3-water (30–60 nm), TiO2-water (5–30 nm), and polystyrene-water (50 nm), are circulated through silicon MCHS having rectangular channels integrated into a closed flow loop. To assess the in situ and real-time nanoparticle clustering during heat transfer experiments, Light Extinction Spectroscopy (LES) is applied as a non-intrusive measurement technique on nanofluids without any fluid sampling. Our findings reveal the appearance of nanofluid discoloration with no measurable increase in heat transfer coefficient. This unexpected change is attributed to the interplay of abrasion, erosion, and corrosion phenomena, likely triggered by the clustering of nanoparticles within the silicon microchannels—a novel insight into the complex dynamics of nanofluid behavior (an increase in the De Brouckere mean diameter from 11 nm to 107.3 nm over a 2.5 h period for TiO2 nanoparticles). The resulting material loss could not be mitigated by altering the nanoparticle material, which may impede heat transfer enhancement under tested conditions.

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“…The schematic of the setup is provided in Figure 3. Detailed information about the PB setup and operation conditions was presented in a prior study [27]. The accuracy of the PB setup was primarily checked and calibrated with DW, in addition to validating against relevant work in the literature under the same operation conditions [27].…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

“…Detailed information about the PB setup and operation conditions was presented in a prior study [27]. The accuracy of the PB setup was primarily checked and calibrated with DW, in addition to validating against relevant work in the literature under the same operation conditions [27]. The setup contained a heater located under the boiling chamber, a condenser on the top of the boiling chamber, a power supply, K-type thermocouples, and a data acquisition system.…”

Section: Experimental Setup and Measurementsmentioning

confidence: 99%

Pool Boiling Heat Transfer Characteristics of SiO2 and BN Nanoparticles Dispersed Mono and Hybrid Nanofluids

Ajeeb,

Murshed

2023

Nanomaterials

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This study reports an experimental investigation of pool boiling (PB) heat transfer performance of hybrid (two types of particles) and mono (single-particle) nanofluids consisting of Boron nitride (BN) and Silicon dioxide (SiO2) nanoparticles (NPs). While hybrid nanofluids (HNFs) were prepared in a total particle concentration of 0.05 vol.% with four different percentages of these two types of NPs (are 0.01/0.04, 0.02/ 0.03, 0.03/0.02, and 0.04/0.01 (BN vol.%/SiO2 vol.%)), two mono nanofluids (MNFs) of BN and SiO2 nanoparticles were prepared at the same total concentration of 0.05 vol.% for each NP type. Both nanofluids (NFs) were prepared in the base fluid (BF), which is the mixture of 15 vol.% of ethylene glycol (EG) and 85 vol.% of distilled water (DW). Then, the boiling heat transfer performance of these MNFs and HNFs was assessed by experimentation in a pool boiling test rig. The obtained results demonstrated good improvements in critical heat flux (CHF) and burnout heat flux (BHF) of both types of NFs. The CHF increased by up to 80% for BN-based MNF and up to 69% for HNF at 0.04 vol.% BN, which is the maximum percentage of BN into HNF, while the lowest improvement in CHF was 48% for the SiO2-based MNF compared to the BF. Similarly, the BHF was found to increase with the increasing in the loading of BN nanoparticles and a maximum enhancement of BHF of 103% for BN-based MNF was observed. These HNFs and MNFs exhibited significantly improved pool boiling heat transfer performance compared to this BF, and it became lower by increasing the percentage of SiO2 NPs in the HNFs.

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Pool Boiling Heat Transfer Characteristics of New and Recycled Alumina Nanofluids

Cited by 4 publications

References 46 publications

Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids

Characterization of Thermophysical and Electrical Properties of SiC and BN Nanofluids

Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels

Pool Boiling Heat Transfer Characteristics of SiO2 and BN Nanoparticles Dispersed Mono and Hybrid Nanofluids

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