Pool Boiling Studies on Nano-Structured Surfaces

Sriraman, S. R.; Banerjee, Debjyoti

doi:10.1115/imece2007-42581

Cited by 9 publications

(5 citation statements)

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“…One manifestation of nFE occurs when nanoparticle coatings formed by nanoparticles cause "anomalous" thermal performance. For example, nanofins formed using nanoparticles with lower thermal conductivity values can cause higher levels of enhancement in heat flux values (compared to that of nanoparticles with higher values of thermal conductivity), especially during phasechange such as boiling on nanostructured heaters [13]. A transport model that resolves the conundrum associated with these anomalous heat transfer phenomena i.e., due to the formation of the compressed phase that envelopes these nanoparticles was therefore termed as the "nanoFin Effect" ("nFE") [12].…”

Section: Nanofin Effect ("Nfe")mentioning

confidence: 99%

Experimental validation of numerical predictions for “Deviant” density enhancement of protein emulsions in oil (Oleo-Nanofluids)

2020

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In this study, an analytical model for estimating the total effective density of nanofluids is developed and experimentally validated. The numerical model is based on weighted average, in proportion, to the indvidual mass fractions of solvent, nanoparticle, and compressed phase of solvent around nanoparticle. Experimental validation of the numerical predictions for deviations in density values, over that of the simple mixture rule, were performed. The neat solvent used in the experiments was a paraffin oil-based phase change material. The experimental results show that the overall enhancement in the density of the nanofluid was 10.9% of which the formation of the compressed phase can be attributed to cause the nanofluid density to deviate by 3%. The "deviant" component of the enhancement for the measured values of density of the nanofluid samples are calculated by taking the difference between the measured values of density and the values predicted by the conventional mixture rule. The experimental results from this study conclusively demonstrate that the formation of the compressed phase can cause deviant behavior by anomalous enhancement of the density ("surplus density") of the samples of oleo-nanofluids synthesized in this study.

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Section: Nanofin Effect ("Nfe")mentioning

confidence: 99%

Experimental validation of numerical predictions for “Deviant” density enhancement of protein emulsions in oil (Oleo-Nanofluids)

2020

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“…37 Nucleate boiling, transition boiling, and film boiling are all distinct boiling regimes based on the excess temperature. 38–39 Nucleate boiling describes the occurrence of bubbles forming on a hot surface in a liquid. Surface temperatures slightly above the liquid’s saturation temperature cause bubbles to form.…”

Section: Introductionmentioning

confidence: 99%

A review of nucleate pool-boiling heat transfer in different liquids and nanofluids

Zarrag,

Ismail,

Sann

et al. 2023

Proceedings of the Institution of Mechanical Engineers, Part A:

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The goal of this review is to examine the current state of the art in nucleate pool boiling heat transfer in a variety of different fluids. The review is divided into many sections that discuss heat transfer in pool boiling, such as pool boiling of nanofluids, boiling behavior of water–glycerin combinations, and operational parameters. With the appropriate mixes of hydrocarbons and other commercial liquids, higher heat transfer coefficients may be produced. Coatings of nanoparticles with varying layer thicknesses applied to the heater surface may be optimized to improve heat transfer from the pool to the surrounding water. The heat transfer hypothesis elucidates the peculiarities of each pool’s boiling regime. It is also possible to expand it to flow boiling by combining pool boiling liquid motion with external mechanical force. Other phase transitions, such as condensation, solidification, and melting, can also be described using boiling heat flow processes. Pool boiling performance can be improved by making a variety of adjustments to the heating surfaces as well as by using pure liquids in the water. Improvements can be made to boiling parameters such as the heat flux, the critical heat flux, the heat transfer coefficient, bubble development and departure, and so forth. A nanoparticle addition to a pure liquid or a surface coating on a heating surface can improve heat transfer and boiling properties by increasing the surface area of the liquid. Pool boiling critical heat flux was enhanced with Al2O3-water nano fluid. Authors used three different powder sizes of Al2O3 which were 0.05, 0.3 and 1.0 μm. Addition of alumina particle in water increases the boiling heat flux. Critical heat flux (CHF) was significantly enhanced using Titania and Alumina nano particles in water as compared to pure water. Average size of nano particle used was 85 nm measured by scattering electron microscope. Enhancement in Critical heat flux is due to nano particle coating on heating surface. Characteristics of nucleate boiling are greatly affected by the operating pressure. Miniature flat heat pipe (MFHP) with evaporator having micro grooved heat transfer surface gives 50% increment in critical heat flux at atmosphere pressure whereas this value increases up to 150% at 7.4 kPa pressure. The addition of CNT (carbon nanotube) to the base liquid increases the critical heat flux. Transmission electron microscopy confirms the average size of a nanoparticle as 15 nm. Authors found that by decreasing pressure from atmosphere condition critical heat flux increases to 200% with CNT/water nano fluid as compared to deionized water. SiC-water nanofluids of 100 nm size were experimented with at volume concentrations of 0.001%, 0.001%, and 0.01%. The size of the nanoparticle was confirmed by a scattering electron microscope. Authors concluded that at 0.01% of nano particle enhances critical heat flux to 105%.

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“…Literature showed many coating morphologies of nanostructures that are deposited and coated on surfaces using different techniques and applied to pool boiling heat transfer enhancement such as nonporous [12], nanoparticle thin lm [13], nanowires [14], nano rods [15], nano bers [16], nano ns [17], ower-like nanostructures [18] and, nano tubes coated surfaces [19].…”

Section: Introductionmentioning

confidence: 99%

On the pool boiling heat transfer enhancement of distilled water using Cu-nanoparticles textured with carbon nanofibers

Ali¹,

Barakat²,

Bassiouny³

et al. 2020

Preprint

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Enhancement of subcooled and saturation pool boiling is of interest for many applications. The present study proposes coating heated surface using nanotextured of Cu nanoparticles with carbon nanofibers. This texture formation on copper substrate surface passes through different chemical stages under specific conditions. Using electrospinning, coating was carried out at different times (5, 15, and 30 min). After vacuum drying at 60 oC for 24 h, the copper substrates attaching the electrospun mat were calcined at 850 oC under vacuum. and accordingly, different contact angles were measured as 80o, 115o, and 102o. The coated surfaces are coded by S1, S2 and S3 for the electrospun coated surfaces of (5, 15, and 30), respectively.All nanostructured coated surfaces showed a good heat transfer enhancement compared to uncoated copper surface for both HTC and CHF. The results showed an enhancement of HTC by 57.83%, 40.3% for S2 and S3 respectively and an enhancement of CHF by 13.67%, 17.11% and 48.14% for S1, S2 and S3 respectively.

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Pool Boiling Studies on Nano-Structured Surfaces

Cited by 9 publications

References 0 publications

Experimental validation of numerical predictions for “Deviant” density enhancement of protein emulsions in oil (Oleo-Nanofluids)

Experimental validation of numerical predictions for “Deviant” density enhancement of protein emulsions in oil (Oleo-Nanofluids)

A review of nucleate pool-boiling heat transfer in different liquids and nanofluids

On the pool boiling heat transfer enhancement of distilled water using Cu-nanoparticles textured with carbon nanofibers

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