scholarly journals Radiative heat transfer between metallic nanoparticle clusters in both near field and far field

2019 ◽  
Vol 99 (13) ◽  
Author(s):  
Minggang Luo ◽  
Jian Dong ◽  
Junming Zhao ◽  
Linhua Liu ◽  
Mauro Antezza
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Near Field ◽  
Far Field ◽  
Metallic Nanoparticle ◽  
Nanoparticle Clusters

Meshed Photonic Crystals for Manipulating Near-Field Thermal Radiation Across Variable Nano/Micro Gap

2017 ◽  
Author(s):  
Mahmoud Elzouka ◽  
Sidy Ndao
Keyword(s):  
Heat Transfer ◽  
Heat Flow ◽  
Photonic Crystals ◽  
Thermal Radiation ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Near Field ◽  
Far Field ◽  
Memory Devices ◽  
Gap Size

The ability to manipulate heat flow can result in wonderful applications such as thermal logic and memory devices. Thermal logic and memory devices are similar to their electronic counterparts, however, they are powered solely by heat. In addition, thermal logic and memory devices can operate in harsh environments where electronics typically fail. Despite our understanding of various mechanisms of heat transfer, controlling heat (in a sense of switching heat flow on or off) is more challenging than controlling electricity due to the lack of perfect thermal insulators. One possible solution is to control the near-field thermal radiation heat transfer between hot and cold terminals by manipulating the size of the vacuum gap separating the two. Unlike far-field thermal radiation, near-field thermal radiation intensity increases exponentially with decreasing the gap size. There are however challenges in manipulating the nano/micro vacuum gaps to achieve enough contrast in heat transfer between the high and low heat transfer cases. In this paper, we present a prototype of a microdevice with a controllable micro gap of size 3 μm (initial gap size) between the hot and cold terminals; this configuration achieves a contrast in near-field radiative heat transfer at temperatures as high as 600 K. Furthermore, we present numerical analysis for meshed photonic crystals to achieve even higher contrast in radiative heat transfer with enhancement in heat transfer as high as 26 times in comparison to far-field.

Near Field Radiative Heat Transfer in a Chain of Metallic Particles

2019 ◽  
Author(s):  
M. G. Luo ◽  
J. M. Zhao ◽  
L. H. Liu
Keyword(s):  
Heat Transfer ◽  
Heat Transport ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Near Field ◽  
Thermal Conductance ◽  
Dipole Approximation ◽  
Metallic Nanoparticle ◽  
Particulate System ◽  
Nanoparticle Chains

Abstract Heat transport mediated by near-field interaction in particulate system (e.g. chain of particles) is one of the research focuses in thermal transport in micro-nanoscale. Near field radiative heat transfer (NFRHT) characteristics of metallic nanoparticle chains (separation distance between neighboring particles is h) are analyzed by means of both coupled electric-magnetic dipole approximation and quadrupole approximation. Thermal conductance (G) between the central particle and other particle with different separation gaps (Δx) is calculated at both 300K and 1200K. Corrected polarizability is used to take quadrupole effect into consideration when calculating the NFRHT in extreme near field where dipole approximation ceases to be valid. Temperature distributions along several different chains of particles due to NFRHT are also predicted. Results show that, according to the asymptotic behavior of distribution of G along metallic chains similar as that observed in SiC chains, heat super-diffusion is demonstrated at both 300K and 1200K in metallic nanoparticle chains. At 300K, the contribution of quadrupole results in that thermal conductance responses to h in different way in metallic and dielectric particle chains. Temperature distribution and heat flow are the two key parameters used to characterize the heat transport in chains of particles. Ag particles in SiC chain act as barriers during the radiative heat transport process. Heat super-diffusion, as well as some other characteristics of NFRHT, observed in metallic nanoparticle chains may help for insight of heat transport in particulate system and new design of device in micro-nanoscale.

Cooling scheme of black phosphorus-based structures via near-field radiative heat transfer

2021 ◽  
Vol 263 ◽  
pp. 107543
Author(s):  
Gao-Feng Ju ◽  
Tong-Biao Wang ◽  
De-Jian Zhang ◽  
Wen-Xing Liu ◽  
Tian-Bao Yu ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Radiative Heat Transfer ◽  
Radiative Heat ◽  
Near Field ◽  
Black Phosphorus
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