Nano-Based Advanced Thermoelectric Design

A special issue of Nanomaterials (ISSN 2079-4991). This special issue belongs to the section "Energy and Catalysis".

Deadline for manuscript submissions: 20 June 2024 | Viewed by 1128

Special Issue Editors

School of Energy and Environmental Engineering, Hebei University of Technology, Tianjin 300401, China
Interests: electronics cooling; thermal storage; film cooling; thermoelectric material
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Guest Editor
Faculty of Engineering Technology, University of Twente, P.O. Box 217, 7500 AE Enschede, The Netherlands
Interests: electronics cooling; thermal storage

Special Issue Information

Dear Colleagues,

Energy is a worldwide concern and has garnered the attention of numerous scientists, who have devoted significant efforts to energy exploitation, utilization, and management, aiming to achieve the sustainable development of human beings. On the one hand, renewable primary energy, e.g., wind energy and solar energy, is being developed. On the other hand, much research has been conducted on energy conversion and management. In the fields of industry, household, and transport, energy is commonly transferred, utilized, and conversed as heat, for instance, in power generation cycles, heating and cooling systems, etc. Therefore, it is critical to properly manage thermal transport and conversion for energy saving and efficiency.

Boiling and condensation are representative heat transfer processes in air conditioning, heat pumps, and Rankie cycles while icing on wind turbine blades is also a significant issue in turbine operation. Nowadays, with the development of micro/nanotechnologies, material sciences provide new perspectives regarding improvements in these thermal processes. For example, hydrophobic/hydrophilic/ice phobic surfaces have been developed for boiling/condensation augmentation and deicing. In addition, thermoelectric materials have been extensively investigated to realize the conversion of heat to electricity, independent of thermodynamic cycles. Furthermore, thermal storage is a prevailing technology able to improve current energy utilization. Many thermal storage materials have been developed to realize thermal storage of different grades, e.g., phase-change materials and thermochemical reaction materials.

The present Special Issue aims to demonstrate the state of the art in thermal energy transport, storage, and conversion. Original research papers, brief research reports, and review papers that address the following topics are welcome:

  • Micro/nano-structure surfaces for boiling/condensation/deicing/combustion/lubrication;
  • Advanced thermoelectric materials;
  • Energy storage materials;
  • Flammable materials.

Dr. Jin Wang
Dr. Zhen Cao
Guest Editors

Manuscript Submission Information

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Published Papers (1 paper)

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Research

18 pages, 6495 KiB  
Article
Micro Lubrication and Heat Transfer in Wedge-Shaped Channel Slider with Convex Surface Texture Based on Lattice Boltzmann Method
by Jinwei Fang, Xiaori Liu, Tianqi Wang and Zhen Song
Nanomaterials 2024, 14(3), 295; https://doi.org/10.3390/nano14030295 - 31 Jan 2024
Viewed by 695
Abstract
Hydrodynamic lubrication is widely used between two relatively moving objects, and the effect of fluid flow state and temperature distribution on lubrication performance in wedge-shaped gaps is a popular topic to study. In this paper, the incompressible double-distribution lattice Boltzmann method (LBM) is [...] Read more.
Hydrodynamic lubrication is widely used between two relatively moving objects, and the effect of fluid flow state and temperature distribution on lubrication performance in wedge-shaped gaps is a popular topic to study. In this paper, the incompressible double-distribution lattice Boltzmann method (LBM) is applied to study the effect of micro convex surface texture on micro lubrication and heat transfer in wedge-shaped channels. By comparing this model with the analytical solution of an infinitely wide wedge slider, the maximum pressure calculated by LBM is 0.1081 MPa, and the maximum pressure calculated by the Reynolds equation is 0.1079 MPa. The error of the maximum pressure is 1.11%, and the Reynolds equation result is slightly smaller. The reason is that the Reynolds equation ignores the influence of fluid inertia force on oil film pressure. The results indicate that the application of LBM can be used to study lubrication problems. Compared with the Reynolds equation, LBM can calculate the velocity field and pressure field in the film thickness direction, and can also observe precise flow field details such as vortices. Three micro convex texture shapes were established to study the effects of different convex textures on micro lubrication and oil film temperature distribution, and the velocity distribution, temperature distribution and oil film pressure along the oil film thickness direction were given. Under the same conditions, comparing the oil film pressure with and without surface texture, the results show that the maximum oil film pressure with surface texture 3 is increased by about 4.34% compared with that without surface texture. The slightly convex texture can increase the hydrodynamic lubrication effect and obtain greater load-bearing capacity, helping to reduce the possibility of contact friction. The results show that the convex surface texture can improve the hydrodynamic lubrication performance, increase the load carrying capacity and reduce the possibility of contact friction, and the convex surface texture can influence the temperature distribution of the oil film. At 3.6 mm in the slider length direction and 7.5 μm in the oil film thickness direction, the temperature of surface texture 1 is 402.64 K, the temperature of surface texture 2 is 403.31 K, and the temperature of surface texture 3 is 403.99 K. The presence of vortices is captured at a high convergence ratio. Full article
(This article belongs to the Special Issue Nano-Based Advanced Thermoelectric Design)
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