Enhancing Boiling Heat Transfer on a Superheated Surface by Surfactant-Laden Droplets

Cai, Zhuojun; Wang, Bo; Liu, Shijie; Li, Haofei; Luo, Siqi; Dong, Zhichao; Wang, Yilin

doi:10.1021/acs.langmuir.2c00745

Cited by 10 publications

(10 citation statements)

References 50 publications

(63 reference statements)

Supporting

Mentioning

Contrasting

Order By: Relevance

“…on the slide, and 3 μL of the test solution was placed on the cotton leaves. Three microliters of test solution released at 30 cm from the leaves on the platform was measured . A photon NOVA S9 high-speed photographic camera (Photon Co., Ltd., Japan) was used to capture the dynamic process of the droplets hitting the cotton leaves from the front.…”

Section: Methodsmentioning

confidence: 99%

“…Three microliters of test solution released at 30 cm from the leaves on the platform was measured. 30 A photon NOVA S9 high-speed photographic camera (Photon Co., Ltd., Japan) was used to capture the dynamic process of the droplets hitting the cotton leaves from the front. The camera had a frequency of 8000 frames/s and a resolution of 1024 × 1024 pixels, and the spread diameter was measured.…”

Section: R S Smentioning

confidence: 99%

See 1 more Smart Citation

Study on Droplet Impact and Spreading and Deposition Behavior of Harvest Aids on Cotton Leaves

et al. 2022

View full text Add to dashboard Cite

The deposition and spreading of pesticide droplets on the surface of plants is a severe challenge to precise pesticide application, which directly affects the pesticide utilization rate and efficacy. Cotton harvest aids are widely used in machine-picked cotton but the effect of formulation and concentration on the droplet behavior and defoliation effect of cotton defoliants is not clear. To clarify the influence of formulation and concentration on the droplet behavior of cotton defoliants, four formulations (suspension concentrate (SC), water dispersible granule (WG), oil dispersion (OD), and wettable powder (WP)) of cotton defoliants were used to prepare different concentrations of harvest aid solutions, according to the spraying volume. The physicochemical properties, droplet impact, and spreading and deposition behavior were studied. The results indicated that the four kinds of harvest aids have good physicochemical properties and can be wet and spread on cotton leaves. The surface tension of the high-concentration harvest aid solution (the spraying volume was less than 1.2 L/667 m2) was increased, which increased the contact angle and reduced the adhesion tension, adhesion work, and the spreading area. Once the harvest aid solution systems impacted the cotton leaves, it could spread to the maximum in a short time (10 ms). The field experiment showed that the droplet spectrum of harvest aids changed slightly, the coefficient of variation (CV) did not exceed 50%, and the defoliation rate was better when the spraying volume was 1.5 L/667 m2. The correlation and principal component analysis showed that the spraying volume (concentration) and coverage were negatively correlated with the defoliation rate, while the viscosity, diffusion factor, and spreading rate were positively correlated with the defoliation rate. Overall, the use of appropriate spraying volume application in cotton fields can improve the performance of spray, increase the effective deposition and wetting spread of defoliants on cotton leaves, further reduce the dosage of defoliants, and improve pesticide utilization. These results can provide a theoretical basis for the scientific preparation and spraying of cotton harvest aid solutions.

show abstract

Section: Methodsmentioning

confidence: 99%

Section: R S Smentioning

confidence: 99%

Study on Droplet Impact and Spreading and Deposition Behavior of Harvest Aids on Cotton Leaves

et al. 2022

View full text Add to dashboard Cite

show abstract

“…Three samples after laser texturing underwent further functionalization that included hydrophobization utilizing a solution of 3,3,4,4,5,5,6,6,7,7,8,8,9,9,10,10,11,11,12,12,12henicosafluorododecylphosphonic acid (abbreviated to FDPA, CAS Nr. 252237-39-1, abcr GmbH product code AB254085).…”

Section: Surface Preparation and Analysismentioning

confidence: 99%

“…Pool boiling, recognized for its exceptional efficacy of heat dissipation, has found application in various industrial systems, including air conditioning [1,2], heat exchangers [3][4][5], domestic refrigerators [6,7], spacecraft thermal management [8,9], and high-power electronics cooling [10][11][12][13]. In recent decades, various cooling methodologies have been advanced for the purpose of heat dissipation, encompassing techniques involving porous media, microchannel heat sinks, spray cooling, as well as natural and forced convection, among others.…”

Section: Introductionmentioning

confidence: 99%

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Berce,

Hadžić,

Može

et al. 2024

Nanomaterials

View full text Add to dashboard Cite

Prior studies have evidenced the potential for enhancing boiling heat transfer through modifications of surface or fluid properties. The deployment of nanofluids in pool boiling systems is challenging due to the deposition of nanoparticles on structured surfaces, which may result in performance deterioration. This study addresses the use of TiO2–water nanofluids (mass concentrations of 0.001 wt.% and 0.1 wt.%) in pool boiling heat transfer and concurrent mitigation of nanoparticle deposition on superhydrophobic laser-textured copper surfaces. Samples, modified through nanosecond laser texturing, were subjected to boiling in an as-prepared superhydrophilic (SHPI) state and in a superhydrophobic state (SHPO) following hydrophobization with a self-assembled monolayer of fluorinated silane. The boiling performance assessment involved five consecutive boiling curve runs under saturated conditions at atmospheric pressure. Results on superhydrophilic surfaces reveal that the use of nanofluids always led to a deterioration of the heat transfer coefficient (up to 90%) compared to pure water due to high nanoparticle deposition. The latter was largely mitigated on superhydrophobic surfaces, yet their performance was still inferior to that of the same surface in water. On the other hand, CHF values of 1209 kW m−2 and 1462 kW m−2 were recorded at 0.1 wt.% concentration on both superhydrophobic and superhydrophilic surfaces, respectively, representing a slight enhancement of 16% and 27% compared to the results obtained on their counterparts investigated in water.

show abstract

“…It is known that at higher wall temperatures, the addition of surfactants can significantly influence the phenomena of boiling, causing foaming in the near-wall region and thus enhancing spray cooling [22][23][24][25][26][27]. Additionally, surfactants can potentially cause the delay of the Leidenfrost point, as already reported in [28,29]. Moreover, the heat transfer can be influenced by the dissolution of different types of organic salts in the bulk liquid [30,31].…”

Section: Introductionmentioning

confidence: 99%

Spray impact onto a hot solid substrate: Film boiling suppression by lubricant addition

et al. 2023

View full text Add to dashboard Cite

Spray cooling of solid substrates is one of the methods used in various industrial processes such as forging, quenching or other metallurgical applications, electronics, pharmaceutical industry, medicine, or for cooling of powerful electrical devices. Spray cooling is governed by various hydrodynamic and thermodynamic processes, like drop impact, heat conduction in the substrate and convection in the spreading drops, and different regimes of boiling. The problem of modeling spray cooling becomes even more challenging if the liquid is multicomponent. The presence of components with various physicochemical properties (surfactants, binders, dispersed particles, etc.) can significantly affect the entire process of spray impact, as well as the outcome of the known cooling regimes and could lead to a formation of a thin deposited layer on the substrate. In this experimental study, spray impact onto a substrate, initially heated to temperatures significantly exceeding the liquid saturation point, is visualized using a high-speed video system. The heat transfer associated with spray impact is characterized using an array of thermocouples installed in a thick metal target. As a working fluid, a mixture of a distilled water and industrial white lubricant was used. It is observed that the presence of very small concentrations of lubricant augments the heat flux dramatically, particularly at high wall temperatures, at which usually film boiling is observed for spray cooling by using distilled water. Three main mechanisms lead to the increase of heat flux and shift of the Leidenfrost point. They are caused by the significant viscosity increase of the evaporating lubricant solutions, by an increase of the substrate wettability and by the emergence of stable liquid sheets between bubbles, preventing their coalescence and percolation of the vapor channels.

show abstract

Enhancing Boiling Heat Transfer on a Superheated Surface by Surfactant-Laden Droplets

Cited by 10 publications

References 50 publications

Study on Droplet Impact and Spreading and Deposition Behavior of Harvest Aids on Cotton Leaves

Study on Droplet Impact and Spreading and Deposition Behavior of Harvest Aids on Cotton Leaves

Effect of Surface Wettability on Nanoparticle Deposition during Pool Boiling on Laser-Textured Copper Surfaces

Spray impact onto a hot solid substrate: Film boiling suppression by lubricant addition

Contact Info

Product

Resources

About