Temperature and heat flux dependence of thermal resistance of water/metal nanoparticle interfaces at sub-boiling temperatures

Vera, Jerry; Bayazıtoğlu, Yıldız

doi:10.1016/j.ijheatmasstransfer.2015.02.033

Cited by 37 publications

(17 citation statements)

References 22 publications

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“…It has been confirmed both experimentally and theoretically [13,14,16,[23][24][25] that under an intensive laser heating (i.e. > 1000 MW/m 2 ), bubbles can be generated around the heated nanoparticles [26,27]. By controlling the laser power and pulse appropriately, the growth and contraction of bubbles can be very fast, which is associated with the propagation of pressure waves that could bring thermal-mechanical damage to surrounding cells at a dimension much larger than that of a single nanoparticle [28].…”

Section: Introductionmentioning

confidence: 81%

Steam generation in a nanoparticle-based solar receiver

et al. 2016

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, Steam generation in a nanoparticle-based solar receiver, Nano Energy, http://dx.doi.org/10. 1016/j.nanoen.2016.08.011 This is a PDF file of an unedited manuscript that has been accepted for publication. As a service to our customers we are providing this early version of the manuscript. The manuscript will undergo copyediting, typesetting, and review of the resulting galley proof before it is published in its final citable form. Please note that during the production process errors may be discovered which could affect the content, and all legal disclaimers that apply to the journal pertain. Steam production is essential for a wide range of applications, and currently there is still strong debate if steam could be generated on top of heated nanoparticles in a solar receiver. We performed steam generation experiments for different concentrations of gold nanoparticles dispersions in a cylindrical receiver under focused natural sunlight of 220 Suns. Combined with mathematical modelling, it is found that steam generation is mainly caused by localized boiling and vaporization in the superheated region due to highly non-uniform temperature and radiation energy distribution, albeit the bulk fluid is still subcooled. Such a phenomenon can be well explained by the classical heat transfer theory, and the hypothesized 'nanobubble', i.e., steam produced around the heated nanoparticles, is unlikely to occur under normal solar concentrations.In the future solar receiver design, more solar energy should be focused and trapped at the superheated region while minimizing the temperature rise of the bulk fluid. Graphical abstract

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Section: Introductionmentioning

confidence: 81%

Steam generation in a nanoparticle-based solar receiver

et al. 2016

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“…The temperature of each slab calculated using equipartition theorem. After the system relaxed to the steady state, the imposed thermostat source and sink method is applied along the in-plane direction (x-direction) of the simulation model to calculate thermal conductivity [30]. In this method, the energy changes are calculated from kinetic energies in the thermostat parts before (old) and after (new) applying the thermostat with following the equations;…”

Section: Model and Simulation Detailsmentioning

confidence: 99%

Molecular Dynamics Study of the Thermal Conductivity of Graphene Coated Copper

Toprak¹,

Ersavaş²

2019

Proceedings of the 5th World Congress on Mechanical, Chemical, and Material Engineering

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In this study, the thermal conductivity of various size of pure copper, pure graphene and, different number of layer graphene coated copper models are studied using non-equilibrium molecular dynamics (NEMD) simulations. Our findings show that the thermal conductivity of graphene coated copper is higher than the uncoated ones. Furthermore, results also indicate that single layer graphene (SLG) model has the highest thermal conductivity as compared to the other model. Even though multiple layer graphene (MLG) has lower thermal conductivity value compare to SLG, this study shows that the thermal conductivity of MLG coated copper has higher thermal conductivity than SLG coated one. The most important finding in this study suggests that the thermal conductivity of copper can be improved using high thermal conductivity materials like graphene.

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“…Therefore, the effect of the wall force field on the thermal behavior of the gas in nanoconfinement should also be considered in the MD simulation. The existing literature reveals that the heat transfer characteristics determined by the heat flux, the temperature distribution, thermal conductivity, etc., of the confined liquid has been studied extensively utilizing appropriate wall/gas interaction potentials [21][22][23][24][25][26][27][28][29][30][31]. However, the distribution of thermally related properties in nanoscale confined gases are not clear yet.…”

Section: Introductionmentioning

confidence: 99%

Interplay of confinement and density on the heat transfer characteristics of nanoscale-confined gas

Rabani

Heidarinejad

Harting

et al. 2018

International Journal of Heat and Mass Transfer

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The effect of changing the Knudsen number on the thermal properties of static argon gas within nanoscale confinement is investigated by three-dimensional molecular dynamics simulations. Utilizing thermalized channel walls, it is observed that regardless of the channel height and the gas density, the wall force field affects the density and temperature distributions within approximately 1 nm from each channel wall. As the gas density is increased for constant channel height, the relative effect of the wall force field on the motion of argon gas atoms and, consequently, the maximum normalized gas density near the walls is decreased. Therefore, for the same Knudsen number, the temperature jump for this case is higher than what is observed for the case in which the channel height changes at a constant gas density. The normalized effective thermal conductivity of the argon gas based on the heat flux that is obtained by implementation of the Irving-Kirkwood method reveals that the two cases give the same normalized effective thermal conductivity. For the constant density case, the total thermal resistance increases as the Knudsen number decreases while for the constant height case, it reduces considerably. Meanwhile, it is observed that regardless of the method used to change the Knudsen number, a considerable portion of the total thermal resistance refers to interfacial and wall force field thermal resistance even for near micrometer-sized channels. It is shown that while the local thermal conductivity in the near-wall region strongly depends on the gas density, the wall force field leads to a reduced local thermal conductivity as compared to the bulk region.

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Temperature and heat flux dependence of thermal resistance of water/metal nanoparticle interfaces at sub-boiling temperatures

Cited by 37 publications

References 22 publications

Steam generation in a nanoparticle-based solar receiver

Steam generation in a nanoparticle-based solar receiver

Molecular Dynamics Study of the Thermal Conductivity of Graphene Coated Copper

Interplay of confinement and density on the heat transfer characteristics of nanoscale-confined gas

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