Two Phase Flow, Phase Change and Numerical Modeling

Ahsan, Amimul

doi:10.5772/1043

Cited by 12 publications

(3 citation statements)

References 301 publications

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“…Surface wettability highly influences the CHF in pool boiling heat transfer. At the intermolecular level, the amount of wettability is also governed by the balance of adhesive forces, which cause the liquid to spread across the surface, and the cohesive forces within the liquid that resist the separation of molecules [ 25 ]. Cohesive forces act between molecules of the same substance, while adhesive forces determine the degree of attraction between molecules of different substances.…”

Section: Literature Results On the Effect Of Surface Wettability On P...mentioning

confidence: 99%

“…Studies [ 25 , 39 ] have shown that hydrophilic surfaces enhance the CHF by ensuring a continuous supply of liquid to be evaporated, which delays surface dry-out. In contrast, hydrophobic surfaces tend to repel liquids from the surface and form vapour blankets more readily during pool boiling, which deteriorates the CHF [ 30 , 39 , 40 ] but also lowers the ONB, leading to a higher HTC.…”

Section: Literature Results On the Effect Of Surface Wettability On P...mentioning

confidence: 99%

“…Thomas Young [ 25 ] established the laws for measuring the contact angle on chemically and microstructurally [ 23 ] homogeneous surfaces. These laws depend on the competing effects of liquid–vapour, solid–liquid and solid–vapour interfacial tensions [ 26 ], which eventually reach an equilibrium state where energy is at a minimum.…”

Section: Background On Pool Boiling Heat Transfer and Its Thermophysi...mentioning

confidence: 99%

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A Meta-Analysis Review: Nanoparticles as a Gateway to Optimized Boiling Surfaces

Motta,

Sergis

2024

Nanomaterials

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Pool boiling is essential in many industrial manufacturing applications. In addition, it can become critical in the journey towards improving energy generation efficiency and accomplishing the goal of net-zero carbon emissions by 2050 via new or traditional power generation applications. The effectiveness of boiling is governed by the bubble cycle. The chemistry and topographical features of the surface being heated have been found to highly impact the boiling performance, such as in the case of pool boiling enhancement when employing hydrophilic and hydrophobic surfaces via nano/micro heater surface modification. Nevertheless, it is questionable how feasible it is to create these surfaces for large-scale applications due to their manufacturing and maintenance cost and complexity. The current work assesses whether the use of nanoparticles in traditional coolants could potentially unlock the mass production of optimised heating surface modification through a metadata literature review analysis. It was discovered that self-assembled layers created as a result of the deposition of nanoparticles in coolants undergoing pool boiling seem to behave most similarly to manufactured hydrophilic surfaces. The creation of enhanced patterned-heat transfer surfaces is shown to be possible via the use of a combination of different nanoparticle suspensions in coolants.

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Section: Literature Results On the Effect Of Surface Wettability On P...mentioning

confidence: 99%

Section: Literature Results On the Effect Of Surface Wettability On P...mentioning

confidence: 99%

Section: Background On Pool Boiling Heat Transfer and Its Thermophysi...mentioning

confidence: 99%

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A Meta-Analysis Review: Nanoparticles as a Gateway to Optimized Boiling Surfaces

Motta,

Sergis

2024

Nanomaterials

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Element-Free Galerkin Formulation by Moving Least Squares for Internal Energy Balance in a Continuous Casting Process

Hostos

Puchi-Cabrera

Bencomo

2015

steel research int.

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The present work has been conducted in order to develop an alternative solution to the heat transfer problem in a conventional continuous casting (CC) process using an Element‐Free Galerkin (EFG) technique with shape functions formulated by a moving least squares approximation. The Internal Energy Balance Equation (Eulerian Description) has been developed with this weak formulation in order to solve the heat transfer problem. The EFG features and the shape functions construction have also been described. The resulting equation system has been adapted to a 2‐D steady‐state temperature distribution over the longitudinal thickness of a solidifying wide slab into the mold region. The transport laws, the nonlinear aspects, and the boundary conditions have been specified. Finally, the model has been solved in order to estimate the thermal distribution and the solidified shell evolution. The results have revealed that this technique could be used successfully in the modeling of CC heat transfer problems.

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A review of the state-of-the-art nanofluid spray and jet impingement cooling

2020

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Nanofluid spray/jet impingement cooling is widespread and finds applications in many scientific and industrial paradigms. Because of these ubiquities of nanofluid spray/jet impingement cooling, this branch of fluid dynamics has attracted great attention from the scientific community. The performance of nanofluid spray/jet impingement cooling very often depends on the nanoparticle concentration, shape, and size of the nanoparticle, as well as the mass flow rate of the nanofluid. These aspects lead to interesting variants of the thermo-hydrodynamic analysis of the nanofluid, which are studied meticulously, and some new functionalities are established such as high heat flux removal capacity, temperature uniformity, lower flow rate demand, and no thermal resistance to the heated test surface. We provide an overview of nanofluid spray/jet impingement cooling with an emphasis on the parametric effects, such as the Reynolds number, jet to test surface distance, the Prandtl number, the confinement of the jets, test plate inclination, and the roughness of the test surface, on the underlying phenomenon. Also, we aptly discuss the essential features of the nanofluid spray/jet impingement cooling, which includes spray properties, cooling fluid properties, substrate properties, and environmental conditions, which affect the heat transfer of spray cooling.

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Two Phase Flow, Phase Change and Numerical Modeling

Cited by 12 publications

References 301 publications

A Meta-Analysis Review: Nanoparticles as a Gateway to Optimized Boiling Surfaces

A Meta-Analysis Review: Nanoparticles as a Gateway to Optimized Boiling Surfaces

Element-Free Galerkin Formulation by Moving Least Squares for Internal Energy Balance in a Continuous Casting Process

A review of the state-of-the-art nanofluid spray and jet impingement cooling

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