Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Gibbons, Michael; Marco, Paolo Di; Robinson, A.J.

doi:10.1016/j.ijheatmasstransfer.2019.119093

Cited by 39 publications

(21 citation statements)

References 25 publications

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“…Thus, the water resistance on the coverslips is weakened and the thermal resistance caused by the water decreases and accordingly an increase in heat transfer is expected. Gibbons et al (2020) examined the water droplet on the hydrophilic coated surface and the heat and mass transfer of the water droplet showing superhydrophobic properties and found that the evaporation rate of the water droplet on the hydrophilic coated surface was 34% faster [27].…”

Section: Resultsmentioning

confidence: 99%

Thermodynamic Analysis of Industrial Cooling Systems with the Usage of Different Types of Evaporators: Experimental Study

Erten¹,

Koşan

Işgen

et al. 2021

Gazi University Journal of Science

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Highlights• 1/2" smooth tube and 3/8" grooved tube types evaporators are designed for industrial refrigerators.• Theoretical and experimental analysis and comparison of smooth and grooved tube evaporators.• The system COP value is 2.807, while it is calculated as 3.013 for the second system.• The grooved tube evaporator has better cooling performance compared to the smooth tube evaporator.

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Section: Resultsmentioning

confidence: 99%

Thermodynamic Analysis of Industrial Cooling Systems with the Usage of Different Types of Evaporators: Experimental Study

Erten¹,

Koşan

Işgen

et al. 2021

Gazi University Journal of Science

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“…Temperature measurement errors calibrated under ambient temperatures (5-25 • C) were about ±1 • C [21], which is inadequate to measure the interface temperature of the droplet. Gibbons et al [22] measured the temperature beneath the hydrophilic and superhydrophobic droplet with the IR thermography. However, the captured thermal image had relatively low spatial resolutions.…”

Section: Introductionmentioning

confidence: 99%

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

et al. 2021

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The present study aims to measure the solid–liquid interface temperature of an evaporating droplet on a heated surface using a thermoresponsive polymer. Poly(N-isopropylacrylamide) (pNIPAM) was used owing to its sensitive optical and mechanical properties to the temperature. We also measured the refractive index variation of the pNIPAM solution by using the surface plasmon resonance imaging (SPRi). In particular, the present study proposed a new method to measure the solid–liquid interface temperature using the correlation among reflectance, refractive index, and temperature. It was found that the reflectance of a pNIPAM solution decreased after the droplet deposition. The solid–liquid interface temperature, estimated from the reflectance, showed a lower value at the center of the droplet, and it gradually increased along the radial direction. The lowest temperature at the contact line region is present because of the maximum evaporative cooling. Moreover, the solid–liquid interface temperature deviation increased with the surface temperature, which means solid–liquid interface temperature should be considered at high temperature to predict the evaporation flux of the droplet accurately.

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“…A traditional method of characterizing the contact angle of a solid-liquid interface is conducted using a side-view method, which is shown in Figure 1. In this configuration, an optical camera is placed parallel to the substrate being investigated [27][28][29][30]. The contact angle, in this approach, is determined by drawing a line from the contact line (solidliquid-gas interface) tangential to the liquid-gas interface.…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Wide Range of Commercial Exterior Wood Coatings

et al. 2020

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This study was focused on measuring the properties of twenty-three commercially available coatings formulated for exterior wood applications. The coatings were characterized by measuring their surface tension, solid content, viscosity, pH, and glass transition temperatures (Tg). Additionally, the wetting properties of coating droplets on wood substrates were measured. The contact angle of solvent-based and water-based coatings were characterized on untreated southern yellow pine wood samples using high-resolution image analysis and the Young–Laplace solution. An innovative image processing technique for determining the average diameter of coating droplets on wood was developed, and an iterative method to calculate the average contact angle using the Young–Laplace solution was applied. The water-resistance of the coated wood samples was evaluated during one week of water immersion tests. In general, solvent-based coatings had significantly lower contact angles and water uptake than water-based coatings. Water-based paint samples had the largest average contact angle (81°), and solvent-based transparent penetrating stains had the smallest contact angle (13.9°). A strong correlation was observed between the coating water uptake and their surface tension and solid content.

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Heat flux distribution beneath evaporating hydrophilic and superhydrophobic droplets

Cited by 39 publications

References 25 publications

Thermodynamic Analysis of Industrial Cooling Systems with the Usage of Different Types of Evaporators: Experimental Study

Thermodynamic Analysis of Industrial Cooling Systems with the Usage of Different Types of Evaporators: Experimental Study

Solid–Liquid Interface Temperature Measurement of Evaporating Droplet Using Thermoresponsive Polymer Aqueous Solution

Analysis of a Wide Range of Commercial Exterior Wood Coatings

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