Name: pool-boiling heat-transfer enhancement on cylindrical surfaces with hybrid wettable patterns
Uploaded: 2017-04-10T14:00:00
Description: Watch this Scientific Journal Video about Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns at JoVE.com

The authors gratefully acknowledge funding support from the Ministry of Science and Technology, MOST (project numbers: MOST 104-2218-E-002 -004, MOST 105-2218-E-002-019, MOST 105-2221-E-002 -107 -MY3, MOST 102-2221-E-002 -133 -MY3, and MOST 102-2221-E-002 -088 -MY3).

1. Fremstilling af de modificerede overflader <ol><li> Manuelt polere prøveemnet (hul kobber cylinder med en 40-mm længde (l), en 25-mm udvendig diameter (d o), og en 18-mm indvendig diameter (d i)) i 15 minutter under anvendelse af en # 2.000 smergel papir. Rens den polerede overflade ved at skylle den med acetone efterfulgt af DI vand. </li><li> Placer den polerede prøveemnet i en ovn i 2 timer ved en konstant temperatur på 120 ° C. </li><li> Forberede en super-h...

<ol>
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The main goal of this investigation was to develop a pool-boiling heat sink for high heat dissipation applications, such as nuclear reactors, boilers, and heat pipes, by introducing the hybrid wettable surface, as described in the protocol section. These surfaces can produce better pool-boiling performances than homogeneous wettable surfaces (hydrophilic and hydrophobic). The improvement in the boiling heat-transfer performance is due to an increase in active nucleation sites and the easy detachment of the formed bubbles...

En høj varmeflux-opretholde anlægget sørger for køling i intervallet 10-10 5 W / cm2 er påkrævet af nye områder inden for elektronik, forsvar, flyelektronik og udvikling nuklear enhed. Konventionel køling med luft er utilstrækkelig til disse anvendelser på grund af den lave varmeledningstal (HTC) for begge fri- og tvungen konvektion betingelser. Faseændringen-baserede køling teknikker, såsom pool kogende og flow kogning, er gode nok til at fjerne høje varmefluxer i størrelsesordenen 10 - 1.000 W / cm2 1. Eftersom to-fase varmeoverførende proces er isotermisk, den afkølede indretning temperatur er næsten konstant over dens overflade. På grund af den ubetydelige variation af temperaturen langs overfladen, kan den termiske chok af anordningen elimineres. Men den største begrænsende parameter i kogende varmeoverførende er den kritiske varmestrømning (CHF), der forårsager en unormal temperaturstigning 2 </sup&gt;. I de sidste årtier er omfattende forskning blevet udført for at forbedre CHF ved hjælp overflademodifikation, nanofluids, og overfladebelægninger 3, 4, 5, 6, 7, 8, 9, 10, 11. Blandt de forskellige metoder, der overfladebelægninger sig at være den bedste metode til at forbedre CHF skyldes den betydelige stigning i overfladearealet. Overfladebelægninger forøger generelt varmeoverførsel ved fin handling, porøsitet effekter, og overfladebefugtelighed 12. Overfladebefugtelighed spiller en væsentlig rolle i kogende varme-overførsel. Tidligere undersøgelser viser, at ved lavere varme-flux betingelser, den hydrofobe overflade viser bedre HTC følge af den tidlige nukleering. Dog påhøjere varmeflux, frigørelsen af ​​de dannede bobler er langsom på grund af den lave affinitet af vand mod overfladen. Dette fører til boble sammensmeltning og resulterer i en lavere CHF 3. På den anden side, en hydrofil overflade giver en højere CHF, på grund af den hurtige frigørelse af de dannede bobler, men det giver en lavere HTC ved lave varmefluxer, på grund af forsinkelsen i boble nukleering 13. De hybride strukturer udviser en bemærkelsesværdig forøgelse i kogende varmeoverførende for alle varmefluxer på grund af den kombinerede virkning af hydrofobicitet og hydrofilicitet 14, 15, 16. Hsu et al. produceret heterogen befugtelig overflade ved at coate super-hydrofil Si nanopartikler på en maskeret kobberoverflade. De opnåede forskellige befugtningsegenskaber forhold ved at variere belægningen tid. Starten af ​​kogning fandt sted tidligere på de heterogene overflader sammenlignet med homogeneous overflade, der væsentligt reduceret væggen overhedning 17. Jo et al. udført boblekogning varmeoverførselsetiketter undersøgelser af hydrofile, hydrofobe, og heterogene befugtnings- overflader. Den heterogene befugtningsoverfladespænding var sammensat af hydrofobe mønstrede prikker på den hydrofile overflade. De fik højere HTC&#39;er og samme CHF for den uensartede overflade er sammenlignet med den hydrofile overflade. En forbedring i kogende varmeoverførende afhænger direkte af antallet af prikker på overfladen og til de anmeldte kogningstilstande 18. I denne undersøgelse blev aksiale hybrid befugtelige mønstre produceret på en cylindrisk kobberoverflade ved hjælp af dyppecoating teknik. Pool-kogende varmeoverførselsetiketter undersøgelser blev udført for at bestemme virkningerne af antallet af interlining og af orienteringen af ​​den hybride befugtelige mønster. Kogende varme flux, HTC og boble dynamik blev analyseret for de alle overtrukne substrater og vire sammenlignet med kobbersubstratet.

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pool-boiling heat-transfer enhancement on cylindrical surfaces with hybrid wettable patterns

In this study, pool-boiling heat-transfer experiments were performed to investigate the effect of the number of interlines and the orientation of the hybrid wettable pattern. Hybrid wettable patterns were produced by coating superhydrophilic SiO2 on a masked, hydrophobic, cylindrical copper surface. Using de-ionized (DI) water as the working fluid, pool-boiling heat-transfer studies were conducted on the different surface-treated copper cylinders of a 25-mm diameter and a 40-mm length. The experimental results showed that the number of interlines and the orientation of the hybrid wettable pattern influenced the wall superheat and the HTC. By increasing the number of interlines, the HTC was enhanced when compared to the plain surface. Images obtained from the charge-coupled device (CCD) camera indicated that more bubbles formed on the interlines as compared to other parts. The hybrid wettable pattern with the lowermost section being hydrophobic gave the best heat-transfer coefficient (HTC). The experimental results indicated that the bubble dynamics of the surface is an important factor that determines the nucleate boiling.

Pool-kogende varmeoverførselsetiketter eksperimenter blev udført på en hybrid befugtelig cylindrisk overflade ved hjælp forsøgsopstillingen hvis skematisk er vist i figur 5. Puljen kogende eksperimentelle fremgangsmåde beskrevet i trin 2 i protokollen afsnit blev udført med succes under behandlingen af ​​virkningen af ​​antallet af interlining og af orienteringen af ​​den hybride befugtelige mønster på pool-kogende performance. Pool-kogende præstati...

Watch this Scientific Journal Video about Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns at JoVE.com

Pool-Boiling Heat-Transfer Enhancement on Cylindrical Surfaces with Hybrid Wettable Patterns

Pool-kogende varmeoverførselsetiketter eksperimenter blev udført for at undersøge virkningen af ​​hybride befugtelige mønstre på varmeoverførselskoefficienten (HTC). Parametrene for undersøgelsen, er antallet af interlining og mønsteret orientering af det modificerede befugtelige overflade.

Pool-Kogning Heat-Transfer Enhancement på cylindriske flader med Hybrid Fugtelige Mønstre

In this study, pool-boiling heat-transfer experiments were performed to investigate the effect of the number of interlines and the orientation of the ...

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Sondering og kortlægning elektrodeoverflader i Solid Oxide Fuel Cells

Solid oxide fuel cells (SOFCs) are potentially the most efficient and cost-effective solution to utilization of a wide variety of fuels beyond hydrogen ...

Fabrication of Nano-engineered Transparent Conducting Oxides by Pulsed Laser Deposition

Fremstilling af Nano-manipuleret ledende gennemsigtige Oxider af Impuls Laser Deposition

Nanosecond Pulsed  Laser Deposition (PLD) in the presence of a background gas allows the deposition  of metal oxides with tunable morphology, structure, ...

High-speed Particle Image Velocimetry Near Surfaces

High-speed Particle Billede Velocimetri nærheden Surfaces

Multi-dimensional and transient flows play a key role in many areas of science, engineering, and health sciences but are often not well understood. The ...

Monolayer Contact Doping of Silicon Surfaces and Nanowires Using Organophosphorus Compounds

Enkeltlags Kontakt doping af silicium overflader og nanotråde Brug organophosphorforbindelser

Monolayer Contact Doping (MLCD) is a simple method for doping of surfaces and nanostructures1. MLCD results in the formation of highly controlled, ultra ...

Evanescent Field Based Photoacoustics: Optical Property Evaluation at Surfaces

Kortvarigt felt Baseret Photoacoustics: Optisk Property Evaluering ved Overflader

Here, we present a protocol to estimate material and surface optical properties using the photoacoustic effect combined with total internal reflection. ...

The Evolution of Silica Nanoparticle-polyester Coatings on Surfaces Exposed to Sunlight

Udviklingen af ​​Silica Nanopartikel-polyester Belægninger på overflader udsat for sollys

Corrosion of metallic surfaces is prevalent in the environment and is of great concern in many areas, including the military, transport, aviation, ...

Measurements of Local Instantaneous Convective Heat Transfer in a Pipe - Single and Two-phase Flow

Målinger af lokale øjeblikkelige konvektive varmetransport i et rør - enkelt- og 2-faset strøm

This manuscript provides step by step description of the manufacturing process of a test section designed to measure the local instantaneous heat transfer ...

Fabricating Reactive Surfaces with Brush-like and Crosslinked Films of Azlactone-Functionalized Block Co-Polymers

Opdigte reaktive overflader med børste-agtig og Crosslinked film af Azlactone-Functionalized blok Co polymerer

In this paper, fabrication methods that generate novel surfaces using the azlactone-based block co-polymer, poly (glycidyl methacrylate)-block-poly (vinyl ...

Uncoupling Coriolis Force and Rotating Buoyancy Effects on Full-Field Heat Transfer Properties of a Rotating Channel

Frakobling corioliskraften og roterende opdrift effekter på Full-Field varme overføre egenskaberne for en roterende kanal

An experimental method for exploring the heat transfer characteristics of an axially rotating channel is proposed. The governing flow parameters that ...