Nucleate pool boiling heat transfer enhancement in saturated Novec 7100 using titanium dioxide nanotube arrays

Fan, Simiao; Tong, Wei; Duan, Fei

doi:10.1016/j.icheatmasstransfer.2021.105166

Cited by 17 publications

(6 citation statements)

References 46 publications

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“…In the current study, n equals to 1.7 for fluids other than water. The surface-fluid combination 𝐶 𝑠𝑓 equals to 0.0036 based on the experimental data for Novec-7100 [52,53]. As depicted in Error!…”

Section: Validation Of Experimental Setupmentioning

confidence: 99%

Saturated Boiling Enhancement of Novec-7100 on Microgroove Surfaces with Anisotropic Properties

Lin,

Kang,

Cheng

et al. 2023

Preprint

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The effects of anisotropic properties (wettability and roughness) on microgroove surfaces in pool boiling heat transfer using Novec-7100 as a working fluid were experimentally investigated. The idea of introducing the concept of anisotropic wettability in boiling experiments draws inspiration from biphilic surfaces. The investigation is also motivated by two-phase immersion cooling, which involves phase-change heat transfer by using dielectric liquid as a working fluid. Very few studies have focused on the effects of surfaces with anisotropic properties on boiling performance. Thus, this study aims to examine the pool boiling heat transfer performance on surfaces with microgroove-induced anisotropic properties under the saturation condition. A femtosecond laser–texturing method was employed to create microgroove surfaces with different groove spacing. The results indicated that anisotropic properties affected the heat transfer coefficient and critical heat flux. Relative to the plain surface, microgroove surfaces enhanced the heat transfer performance due to the increased number of bubble nucleation sites and higher bubble detachment frequency. An analysis of bubble dynamics under different surface conditions was conducted with the assistance of high-speed images. The microgroove surface with groove spacing of 100 μm maximally increased the BHTC by 37% compared to the plain surface. Finally, the CHF results derived from experiments were compared with related empirical correlations. Good agreement was achieved between the results and the prediction correlation.

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Section: Validation Of Experimental Setupmentioning

confidence: 99%

Saturated Boiling Enhancement of Novec-7100 on Microgroove Surfaces with Anisotropic Properties

Lin,

Kang,

Cheng

et al. 2023

Preprint

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“…Droplet impingement onto a target surface is a fundamental approach to mimicking modern and sophisticated engineering applications in thermal-fluid engineering, such as thermal management of electronic packaging [1], data center cooling [2], spray cooling and jet impingement [3,4], fuel spraying [5], and drop-on-demand studies [6,7]. There are two types of droplet impingement techniques, which are single droplet impingement and droplet train impingement [8].…”

Section: Introductionmentioning

confidence: 99%

“…The Reynolds number is the ratio of the inertial forces to viscous forces for quantifying the turbulent flows. Both We and Re are defined in Equations ( 1) and (2), respectively.…”

Section: Introductionmentioning

confidence: 99%

Thermographic Observation and Hydrodynamic Patterns of Inclined Ethanol Droplet Train Impingement on a Non-Uniformly Heated Glass Surface

Kanbur

Heng

Duan

2022

Fluids

Self Cite

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Droplet train impingement is a fundamental approach to mimic the complicated interactions between the fluid and the substrate in advanced thermal engineering applications in industry. Differently from previous studies, the main original contribution of this study is to perform an inclined droplet train impingement on a non-uniformly heated surface. Ethanol was used as the liquid for droplet train impingement applications, while glass substrate was selected as the target surface. The inclined flow angle was 63 degrees. Both optical and thermographic observations were performed on the target surface by focusing on the droplet impact area. Three experimental sets were created with the Weber numbers 667.57, 841.90, and 998.01. A surface temperature range was selected between 85.00 °C and 200.00 °C, which was above the boiling point of the ethanol. The maximum spreading length was measured at 0.97 mm at the surface temperature of 82.00 °C for the experiment with the Weber number of 998.01, whilst the minimum spreading length was found at 0.18 mm at the highest surface temperature for the experiment with the Weber number of 667.57. A uniform splashing direction was observed above 170.00 °C for all experiments, which meant that the sign of the transition regime appeared.

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“…Pool boiling is a widely used cooling technique in high heat flux applications such as integrated microelectronic devices, nuclear reactors, and space equipment. , To meet the increasing heat dissipation demands, various surface patterns have been designed and investigated to enhance pool boiling heat transfer, such as micro-pin-fin, pillar, micro/nano tube, , nanowire, and microporous architecture . Results indicate that surface wettability has significant influence on pool boiling because it affects bubble behaviors and liquid wetting state on the heating surface. − Previous studies have reported that hydrophobic surfaces promote early onset of nucleate boiling (ONB), although bubbles tend to stay on hydrophobic surfaces, which leads to lower critical heat flux (CHF).…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Influence of Surface Wettability on Bubble Formation and Motion

Xia

Gao

2021

Langmuir

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Bubble dynamics plays an important role in boiling heat transfer, and surface wettability affects bubble behaviors. In the present work, the effects of surface superhydrophilicity (SHI) and superhydrophobicity (SHO) on bubble dynamics are experimentally studied by observing the formation and motion behaviors of air bubbles and vapor bubbles on varied surfaces. For air bubbles to better mimic vapor bubbles, the air bubbles are introduced in a water pool by injecting airflow from a through hole of the surface. Air bubble tests are first conducted on homogeneous SHO and SHI surfaces, respectively. It is observed that surface wettability significantly affects the bubble size and departure frequency. To discover the dynamic behaviors of a bubble under both SHI and SHO, a biphilic surface with SHI and SHO areas is fabricated, and air bubbles are injected right on the biphilic border between the two areas. It is observed the wettability contrast significantly displaces the air bubbles, which spread only onto the SHO area. The biphilic surface is fabricated for the pool boiling test. Vapor bubbles are observed at different stages of the nucleate boiling, showing surface effects similar to the observations of air bubbles. Not only does this study present the influence of surface wettability on air and vapor bubble behaviors but also it provides useful implications for understanding and optimizing the biphilic surface design for enhancing boiling heat transfer.

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Nucleate pool boiling heat transfer enhancement in saturated Novec 7100 using titanium dioxide nanotube arrays

Cited by 17 publications

References 46 publications

Saturated Boiling Enhancement of Novec-7100 on Microgroove Surfaces with Anisotropic Properties

Saturated Boiling Enhancement of Novec-7100 on Microgroove Surfaces with Anisotropic Properties

Thermographic Observation and Hydrodynamic Patterns of Inclined Ethanol Droplet Train Impingement on a Non-Uniformly Heated Glass Surface

Influence of Surface Wettability on Bubble Formation and Motion

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