Steam condensation heat transfer on lubricant-infused surfaces

Stoddard, Ryan Manse; Nithyanandam, Karthik; Pitchumani, R.

doi:10.1016/j.isci.2021.102336

Cited by 13 publications

(7 citation statements)

References 39 publications

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“…with the aim to design a surface able to repel water but also more complex fluids, ice, and even insects . Since then, SLIPSs have been shown to exhibit many useful properties such as antiwetting and droplet shedding, self-cleaning, anti-icing, antifouling, heat transfer enhancing, and drag reducing and have accordingly been proposed as promising materials for application in food packaging, coatings, heat exchangers, turbines, and microfluidics. − Many different fabrication methods have been explored for developing textured SLIPS backbones, including chemical methods such as chemical etching or chemical deposition, physical methods such as electrospinning, and microfabrication methods such as photolithography and laser micromachining . In summary, three main structures have been investigated: microstructures, nanostructures, and hierarchical structures (composed of nanostructures superimposed onto microstructures).…”

Section: Introductionmentioning

confidence: 99%

Investigating the Effects of Lubricant Infusion Methods on Polymer SLIPS

Casey,

Dano,

Busch

et al. 2024

ACS Appl. Mater. Interfaces

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Slippery lubricant infused porous surfaces (SLIPSs) are promising bioinspired surfaces with self-healing and droplet wetting properties, among many others, that are desirable due to their range of applications. Recently, there have been many developments in the SLIPS field regarding the creation of textured surfaces and lubricant selection. However, there is a lack of knowledge regarding the method of lubricant infusion. In this study, we aim to fill this void by investigating different infusion methods that impose external forces on the lubricant. We developed our SLIPS by hot embossing nanostructures onto polypropylene by using molds that were laser micromachined. These textured surfaces were then infused with silicone oil using three different infusion methods: ultrasonication, vacuum, and hydrostatic pressure. We analyzed the wettability and slipperiness of the SLIPS by evaluating the critical tilt angle and comparing the sliding velocities of water droplets on each sample at a tilt angle of 20°. Additionally, the durability of the SLIPS was tested by dropping 50 successive water drops onto the samples and evaluating the droplet−surface interactions throughout. The sonicated infusion method yielded SLIPS that performed the best with a contact angle hysteresis of 13°, a critical tilt angle of 18.3°, a sliding velocity of 1.66 mm/s, and the least accumulation of droplets over time with use. These values are greatly improved when compared to the control sample where lubricant was simply dripped on, which resulted in a contact angle hysteresis of 20°, a critical tilt angle of 26.3°, and a sliding velocity of 0.23 mm/s. The sonicated and drip infusion methods were also compared with different materials (stainless steel) and different textures (microstructures). It was found that the improvement in slipperiness using the sonicated infusion method is prominent for nanoscale textures on both stainless steel and polypropylene. In this study, we discuss the challenges with oil depletion in SLIPS (cloaking and wetting ridges) and with the selection of contact angle measurement methods. While further investigation as to why certain applied forces during infusion yield better SLIPS is warranted, these forces greatly affect the outcome. This work suggests that researchers should consider using sonication or other methods of lubricant infusion that apply external forces as infusion techniques to yield better SLIPS on the nanoscale.

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Section: Introductionmentioning

confidence: 99%

Investigating the Effects of Lubricant Infusion Methods on Polymer SLIPS

Casey,

Dano,

Busch

et al. 2024

ACS Appl. Mater. Interfaces

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“…Cha et al 16 emphasized the importance of the hysteresis angle in enhancing condensation heat transfer. Stoddard et al 17 studied the condensation heat transfer performance of various porous substrates impregnated with krytox oil on horizontal condenser tubes and found that when functionalized with mercaptan and infused with krytox-104, the surface can enhance the condensation heat transfer coefficient by four times. Sett et al 18 studied the effect of various lubricating oils like fluorinated krytox oils, hydrocarbon oils, silicone oils, mineral oils, and ionic liquids on the durability of SLIPS and provided guidelines for lubricant oil-condensate selection.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of dropwise condensation from a vertical condenser tube impregnated with semisolid lubricant

Abraham,

Rajkumar,

Venugopal

2024

Heat Trans

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The quest for augmenting dropwise condensation heat transfer performance has been the driving force behind the exploration of innovative techniques and approaches to fulfill the desired objective. Mostly, earlier research on dropwise condensation was devoted to study condensation from horizontal tubes and plates but, rarely, addressed dropwise condensation from vertical tubes. An interesting topic of current research in dropwise condensation is to explore the application of Slippery Liquid Infused Porous Surfaces (SLIPSs) to improve the condensation performance. The aforesaid facts are the motivation behind the topics of interest in the present study. In this study, we explore the applicability of semisolid lubricant‐impregnated porous surfaces in enhancing dropwise condensation performance of a vertical condenser tube. The experiments conducted over a wide range of subcooling (5°C ≤ ΔT ≤ 65°C) in saturated steam environment showed significant improvement in condensation heat transfer coefficient of a vertical condenser tube impregnated with semisolid lubricants when compared to bare vertical condenser tube. The highest enhancement is found to be 280% at a subcooling of 40°C. Furthermore, these surfaces proficiently sustain dropwise condensation over a period of 72 hours without compromising heat transfer performance. The devised fabrication method is simpler, more cost‐effective, and less time‐consuming than earlier techniques used for creating SLIPSs. Additionally, an approach based on numerical optimization by a stochastic global optimization technique, namely, Genetic Algorithm, is proposed to retrieve the coefficients and the exponent in the mathematical expression of overall resistance, that is being used to compute the tube‐side dropwise convection heat transfer coefficient.

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“…Because of the geometrical complexities of representing multiscale surface textures, interfacial resistance is not directly related to the roughness features in the existing studies, and the studies on mono-scale pillared structures do not directly apply to realistic rough surfaces. The present study addresses the limitation by adopting a fractal description of multiscale rough surfaces, 46 which has been used previously to investigate diverse phenomena including drag reduction, 47 corrosion mitigation, 48 self-cleaning of photovoltaic panel glass, 49 convection, 50 condensation, 51 and solar absorbers. 52 Using the Weierstrass−Mandelbrot (W−M) function to represent the multiscale rough surface, the article presents, for the first time, computational simulations of a water droplet resting on the fractal asperity structure in Cassie State, wherein the water contact angle is related to the fractal parameters of the rough SH surface through a closed-form analytical relationship.…”

Section: ■ Introductionmentioning

confidence: 99%

Freezing Characteristics of a Water Droplet on a Multiscale Superhydrophobic Surface

2023

Self Cite

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Superhydrophobic surfaces have the potential to retard ice formation owing to their super water-repellant nature arising from high static contact angle and low contact angle hysteresis. Most of the previous studies have focused on patterned surfaces with mono-scaled prismatic structures. In contrast, the freezing behavior on multiscaled rough superhydrophobic surfaces that are of practical significance is relatively little studied. This article presents, for the first time, the freezing dynamics of a water droplet interacting with multiscale fractal superhydrophobic surfaces which validates well with experimental measurements. It is shown that the dual effects of increased contact angle and poor interfacial conduction due to trapped air cavities within the roughness features of the superhydrophobic surface lead to increasing freezing time with increasing surface hydrophobicity, determined as a function of the fractal surface parameters. A comparison of the freezing dynamics of sessile droplets of identical contact angle on a smooth versus a rough superhydrophobic surface shows that interfacial asperity thermal resistance contributes to over 14% increase in the freeze time. It is further shown that by tailoring the multiscale characteristics, the freeze time may be increased by up to 7-fold compared to freezing on a smooth surface. The application of the numerical model to studying ice formation on several practical superhydrophobic surfaces of a range of metallic materials and fabrication methods is also discussed, which offers guidelines for the design of anti-icing surfaces in practice.

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Steam condensation heat transfer on lubricant-infused surfaces

Cited by 13 publications

References 39 publications

Investigating the Effects of Lubricant Infusion Methods on Polymer SLIPS

Investigating the Effects of Lubricant Infusion Methods on Polymer SLIPS

Evaluation of dropwise condensation from a vertical condenser tube impregnated with semisolid lubricant

Freezing Characteristics of a Water Droplet on a Multiscale Superhydrophobic Surface

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