Functionalized interfaces enhancing phase-change processes have immense applicability in thermal management. Here, a methodology for fabrication of surfaces enabling extreme boiling heat transfer performance is demonstrated, combining direct nanosecond laser texturing and chemical vapor deposition hydrophobic fluorinated silane. Multiple strategies are explored on aluminum with subsequent nanoscale hydrophobization. Both superhydrophilic superhydrophobic laser-engineered microcavities...

This study investigates the effect of experimental setup design factors on pool boiling CHF, compares spatial temperature gradient calculation methods and analyzes uncertainty heat flux surface superheat. Reported CHF values smooth copper surfaces, measured for saturated water at atmospheric pressure flat horizontal samples, are highly scattered, which cannot be explained solely by measurement or randomness process. data 54 experiments from 47 publications is analyzed using regression...

In this study, the optimal surface pattern of low and high wettability regions for enhanced boiling heat transfer is investigated using aluminum superbiphilic surfaces. Samples are fabricated by combining chemical vapor deposition a fluorinated silane to turn them superhydrophobic nanosecond laser texturing render selected areas superhydrophilic. Triangular lattice circular spots utilized with spot diameters between 0.25 mm 1.0 pitch values 0.5–2.5 mm. Pool performance surfaces evaluated...

Growing world population and increasing density are leading to waste production with biological amounting several billion tonnes annually. Together the need for renewable energy sources, waste-to-biogas conversion as a prime example of waste-to-energy technology represents facile way solving two problems simultaneously. This review aims address recent progress in field technology, which is lately facing intensive research development, present current status this treatment method both...

Abstract The rapid advancement of engineering systems has spurred the search for innovative thermal management solutions. Boiling, as a phase‐change heat transfer method, shown promise in dissipation, but non‐functionalized surfaces struggle with increasing cooling demands. To improve dissipation efficiency across different loads, functionalized tailored wettability have been proposed. Separately, superhydrophilic and superhydrophobic each offer benefits drawbacks boiling applications...

Heat exchanger performance is significantly reduced in the presence of impurities one or both fluid streams, frequently by deposits inversely soluble salts. Accordingly, immense efforts were and still are spent to combat, predict, investigate such fouling problems mitigate reduction heat transfer performance. In this study, calcium carbonate crystallization a corrugated plate was investigated. Fouling monitored using temperature flow measurements, and, for first time, coupled with infrared...

Long-term boiling stability marks an important and often overlooked characteristic when engineering advanced interfaces for efficient phase-change heat removal. This study presents long-term pool on functionalized smooth laser-textured copper in de-ionized water aqueous solution of calcium sulphate. Each surface was exposed to nucleate several hundred hours wettability, morphology chemistry were evaluated prior after each test. In addition, consecutive curves recorded all samples. Our...

This study explores the nuanced interplay between surface wettability and morphology in nucleate boiling heat transfer. Surfaces with identical microstructures but varying are created on copper substrates using laser texturing a hydrophobic agent. The spacing laser-etched microchannels is adjusted to achieve different contact angles percentages of laser-textured areas. Boiling performance assessed variations channel coverage, revealing significant differences hydrophilic surfaces. critical...

The study aimed to develop a superhydrophobic coating on the aluminium alloy 2024-T3 surface. desired surface roughness and low energy were achieved with SiO2 nanoparticles, synthesised via Stöber method modified alkyl silane (AS) or perfluoroalkyl (FAS). To enhance particle adhesion substrate, nanoparticles incorporated into hybrid sol–gel composed of tetraethyl orthosilicate, methyl methacrylate, 3-methacryloxypropyl trimethoxysilane. coated substrates characterised using field emission...

Increasing heat dissipation requirements of small and miniature devices demands advanced cooling methods, such as application immersion via boiling transfer. In this study, functionalized copper surfaces for enhanced transfer are developed evaluated. Samples using a chemical oxidation treatment with subsequent hydrophobization selected fluorinated silane. Pool tests water, water/1-butanol mixture self-rewetting properties novel dielectric fluid low GWP (Novec™ 649) conducted to evaluate the...

The enhancement of boiling heat transfer has been extensively shown to be achievable through surface texturing or fluid property modification, yet few studies have investigated the possibility coupling both approaches. present work focuses on exploring concomitant pool by using TiO2-water nanofluid in combination with laser-textured copper surfaces. Two mass concentrations 0.001 wt.% and 0.1 are used, along two nanoparticle sizes 4–8 nm 490 nm. Nanofluids prepared sonification degassed...

Surface engineering aimed at tuning the wettability and morphology of boiling surface is a facile approach to moderate enhance nucleate process. Key issues include control over active nucleation site density, bubble departure frequency liquid replenishment sites while simultaneously reducing temperature. In this study, we fabricated spear-type (ST) cavity-type (CT) TiO2 nanostructures on 25 μm titanium foils via hydrothermal etching in an alkaline solution. High-speed IR video cameras were...

The low boiling temperature of dielectric fluids makes them suitable for satisfying the cooling requirements advanced high-energy-density devices commonly found in microelectronics. However, high wettability/wickability such coolants significantly affects dynamics, opening new research questions on crucial role played by micro- and nanostructures surface. While different studies point out importance microscale grooves, pillars cavities to promote nucleation enhance heat transfer coefficient...

Droplet impacting and freezing on solid surfaces are ubiquitous in nature crucial to many industrial applications, while the underlying mechanism of this phenomenon remains elusive. In paper, effect surface wettability dynamic behaviors a water droplet substrate at fixed Weber number 200 has been experimentally investigated various temperatures from −35.2 −10 °C. With decrease temperature superhydrophobic surface, complete rebound behavior moves partial ultimately full adhesion, mainly due...

The boiling performance of functionalized hybrid aluminum surfaces was experimentally investigated for water and self-rewetting mixtures 1-butanol. Firstly, microstructured were produced via chemical etching in hydrochloric acid the effect time on surface morphology evaluated. An 5 min found to result pitting corrosion weakly hydrophilic with many microcavities. Observed cavity-mouth diameters between 3.6 32 μm are optimal efficient nucleation provided a superior performance. Longer times 10...