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Title: Near-field radiative heat transfer between rough surfaces modeled using effective media with gradient distribution of dielectric function

Abstract

Near-field radiative heat transfer (NFRHT) between rough surfaces, due to its widespread presence in engineering practice of near-field energy utilization, requires indepth studies, especially from the perspective of physical mechanism. In this paper, an effective multilayer model is built to approach the NFRHT between random rough surfaces of silicon carbide (SiC). Using the effective medium theory (EMT), the effective dielectric function of each layer is obtained, which forms a gradient distribution of dielectric function along the depth of the medium. The influence of the effective dielectric function on surface phonon polaritons (SPhPs) is analyzed, showing that the effective layers with small filling fraction of SiC feature lower SPhP resonance frequencies than SiC bulk. The coupling of SPhPs from the gradient distribution of dielectric function produces new surface modes that dominates the NFRHT. Investigation on the effect of root mean square height (RMS height, σ) reveals that the peaks of local density of states (LDOS) and spectral heat flux are red-shifted as σ increases, while the spectral heat flux below the peak frequency gets larger. This can be attributed to the coupling of SPhPs inside the rough layer. We also found the total net heat flux between rough surfaces separated bymore » an average distance exceeds that between smooth plates and increases with increasing σ, which offer a new way to enhance NFRHT. Finally, this work provides a reference for the simulation and understanding of the NFRHT between rough surfaces.« less

Authors:
 [1];  [1];  [2];  [3];  [4]
+ Show Author Affiliations
  1. Harbin Inst. of Technology (China)
  2. Harbin Inst. of Technology (China); Key Lab. of Aerospace Thermophysics, Harbin (China)
  3. Harbin Inst. of Technology (China); Shandong Univ., Qingdoa (China)
  4. Georgia Inst. of Technology, Atlanta, GA (United States)
Publication Date:
Research Org.:
Georgia Institute of Technology, Atlanta, GA (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES); National Natural Science Foundation of China (NSFC)
OSTI Identifier:
1594788
Alternate Identifier(s):
OSTI ID: 1698095
Grant/Contract Number:  
SC0018369; 51336002; HIT.BRETIII.201415
Resource Type:
Accepted Manuscript
Journal Name:
International Journal of Heat and Mass Transfer
Additional Journal Information:
Journal Volume: 142; Journal Issue: C; Journal ID: ISSN 0017-9310
Publisher:
Elsevier
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; near-field radiative heat transfer; rough surface; effective media; gradient distribution of dielectric function

Citation Formats

Xu, D. Y., Bilal, A., Zhao, J. M., Liu, L. H., and Zhang, Z. M. Near-field radiative heat transfer between rough surfaces modeled using effective media with gradient distribution of dielectric function. United States: N. p., 2019. Web. doi:10.1016/j.ijheatmasstransfer.2019.118432.
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Xu, D. Y., Bilal, A., Zhao, J. M., Liu, L. H., & Zhang, Z. M. Near-field radiative heat transfer between rough surfaces modeled using effective media with gradient distribution of dielectric function. United States. https://doi.org/10.1016/j.ijheatmasstransfer.2019.118432
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Xu, D. Y., Bilal, A., Zhao, J. M., Liu, L. H., and Zhang, Z. M. Sat . "Near-field radiative heat transfer between rough surfaces modeled using effective media with gradient distribution of dielectric function". United States. https://doi.org/10.1016/j.ijheatmasstransfer.2019.118432. https://www.osti.gov/servlets/purl/1594788.
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@article{osti_1594788,
title = {Near-field radiative heat transfer between rough surfaces modeled using effective media with gradient distribution of dielectric function},
author = {Xu, D. Y. and Bilal, A. and Zhao, J. M. and Liu, L. H. and Zhang, Z. M.},
abstractNote = {Near-field radiative heat transfer (NFRHT) between rough surfaces, due to its widespread presence in engineering practice of near-field energy utilization, requires indepth studies, especially from the perspective of physical mechanism. In this paper, an effective multilayer model is built to approach the NFRHT between random rough surfaces of silicon carbide (SiC). Using the effective medium theory (EMT), the effective dielectric function of each layer is obtained, which forms a gradient distribution of dielectric function along the depth of the medium. The influence of the effective dielectric function on surface phonon polaritons (SPhPs) is analyzed, showing that the effective layers with small filling fraction of SiC feature lower SPhP resonance frequencies than SiC bulk. The coupling of SPhPs from the gradient distribution of dielectric function produces new surface modes that dominates the NFRHT. Investigation on the effect of root mean square height (RMS height, σ) reveals that the peaks of local density of states (LDOS) and spectral heat flux are red-shifted as σ increases, while the spectral heat flux below the peak frequency gets larger. This can be attributed to the coupling of SPhPs inside the rough layer. We also found the total net heat flux between rough surfaces separated by an average distance exceeds that between smooth plates and increases with increasing σ, which offer a new way to enhance NFRHT. Finally, this work provides a reference for the simulation and understanding of the NFRHT between rough surfaces.},
doi = {10.1016/j.ijheatmasstransfer.2019.118432},
journal = {International Journal of Heat and Mass Transfer},
number = C,
volume = 142,
place = {United States},
year = {Sat Jul 27 00:00:00 EDT 2019},
month = {Sat Jul 27 00:00:00 EDT 2019}
}
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Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1016/j.ijheatmasstransfer.2019.118432
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Cited by: 11 works
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Figures / Tables:

Fig. 1 Fig. 1: Profile of a medium with rough surface (a) and a schematic of its cross section on x-z plane (b) forming the gradient distribution of dielectric function. The rough layer is divided into several layers, with each layer featuring a filling fraction of SiC, which increases along z-axis. Themore » definition of dep is also shown, which is the vertical distance between an interested location of the medium and the highest point of the rough surface.« less
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