Experimental investigation of the influence of nanoparticles on droplet spreading dynamics and heat transfer during early stage cooling

Aksoy, Yunus Tansu; Castanet, Guillaume; Eneren, Pinar; García-Wong, A.C.; Czerwiec, T.; Caballina, Ophélie; Vetrano, Maria Rosaria

doi:10.1016/j.expthermflusci.2023.111023

Cited by 8 publications

(2 citation statements)

References 50 publications

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“…The measured heat capacity and thermal conductivity values of water-based nanofluids (0.01-0.3 vol.%) are reported very close to that of water in the literature [40,41].…”

Section: Thermophysical Properties Of the Nanofluidssupporting

confidence: 81%

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 measured heat capacity and thermal conductivity values of water-based nanofluids (0.01-0.3 vol.%) are reported very close to that of water in the literature [40,41].…”

Section: Thermophysical Properties Of the Nanofluidssupporting

confidence: 81%

Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels

Eneren,

Aksoy,

Vetrano

2023

Energies

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“…In the heat and mass-transfer systems, solid–liquid heat transfer plays a crucial role in enhancing the system efficiency. The spreading or diffusion of droplets would cause the flow inside droplets and further affect the heat transfer between droplets and solid walls. , In contemporary heat-transfer research, high-speed camera and infrared thermal imager are used for experimental measurement, while numerical simulations employ methods such as VOF, LEVEL SET, LBM, PFM, and MDPD. , The rate and intensity of heat transfer are usually characterized by parameters such as wall temperature, wall heat flux, and Nusselt number. , Teodori et al investigated the heat-transfer phenomenon between millimeter-sized ethanol and pure water droplets and the heated wall, and the bubbles generated in the droplet impact area and the temperature changes at the spreading edge of the droplet were identified. The results show that the heat-transfer efficiency between the droplet and the wall is influenced by the droplet’s material, with ethanol droplets exhibiting higher heat-transfer efficiency.…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat-Transfer Characteristics of Droplet Impingement on Hydrophilic Wires

Liu,

Zhang

et al. 2023

Langmuir

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It is a common phenomenon that droplets collide with wires in industrial production, and their flow and heat-transfer behavior significantly impact the production efficiency. This article presents an experimental and numerical study on the impact of pure water droplets on hydrophilic stainless-steel wires. The dynamic behavior and solid−liquid heat-transfer law of droplet impacting the wire are emphatically analyzed. The impact position of the droplets has a significant effect on their morphology. Under the condition of low Weber number (We), eccentric impacts tend to cause droplets to separate from the wire. Additionally, both We and wire/droplet size ratio have noticeable effects on the droplet morphology. The smaller the We, the larger the wire/droplet size ratio, and the easier it is for droplets to be captured by wires. Conversely, as We increases and the wire-to-droplet size ratio decreases, some droplets become detached from the wire, primarily exhibiting a single-film falling mode. Furthermore, the impact morphology of droplets is influenced by the Ohnesorge number (Oh). The higher the Oh, the more inclined the droplet to develop a double-film falling mode. There is obvious field synergy in the process of droplet impacting on wire. The maximum heat flux is located at the three-phase contact line, while the minimum heat flux is observed at the bubble interface. The impact position of droplets influences the temperature distribution, although its impact on the magnitude of temperature variation is minimal.

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Non-trivial thermal and rheological behaviour of complex nanofluids in bifurcated micro-confinements

Rastogi,

Mondal,

Bakli

2024

Thermal Science and Engineering Progress

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Experimental investigation of the influence of nanoparticles on droplet spreading dynamics and heat transfer during early stage cooling

Cited by 8 publications

References 50 publications

Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels

Practical Challenges in Nanofluid Convective Heat Transfer Inside Silicon Microchannels

Flow and Heat-Transfer Characteristics of Droplet Impingement on Hydrophilic Wires

Non-trivial thermal and rheological behaviour of complex nanofluids in bifurcated micro-confinements

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