Dependence of nanoscale heat transfer across a closing gap on the substrate material and ambient humidity

2020 ◽  
Vol 116 (21) ◽  
pp. 213102
Author(s):  
Qilong Cheng ◽  
Siddhesh Sakhalkar ◽  
Amin Ghafari ◽  
Yuan Ma ◽  
David Bogy
Keyword(s):  
Heat Transfer ◽  
Substrate Material ◽  
Ambient Humidity ◽  
Nanoscale Heat Transfer

Performance Comparison of Microchannel Heat Sink Using Boron-Based Ceramic Materials

2021 ◽  
Vol 1163 ◽  
pp. 73-88
Author(s):  
Md Tanbir Sarowar
Keyword(s):  
Heat Transfer ◽  
Heat Flux ◽  
Heat Sink ◽  
Electronic Devices ◽  
Ceramic Materials ◽  
Substrate Material ◽  
Heat Sinks ◽  
Maximum Temperature ◽  
Microchannel Heat Sink ◽  
Small Surface

Microchannel heat sink plays a vital role in removing a considerable amount of heat flux from a small surface area from different electronic devices. In recent times, the rapid development of electronic devices requires the improvement of these heat sinks to a greater extent. In this aspect, the selection of appropriate substrate materials of the heat sinks is of vital importance. In this paper, three boron-based ultra-high temperature ceramic materials (ZrB2, TiB2, and HfB2) are compared as a substrate material for the microchannel heat sink using a numerical approach. The fluid flow and heat transfer are analyzed using the finite volume method. The results showed that the maximum temperature of the heat source didn’t exceed 355K at 3.6MWm-2 for any material. The results also indicated HfB2 and TiB2 to be more useful as a substrate material than ZrB2. By applying 3.6 MWm-2 heat flux at the source, the maximum obtained surface heat transfer coefficient was 175.2 KWm-2K-1 in a heat sink having substrate material HfB2.

Violation of Boltzmann Equipartition Theorem in Angular Phonon Phase Space Slows down Nanoscale Heat Transfer in Ultrathin Heterofilms

Nano Letters ◽  
2021 ◽  
Author(s):  
Anja Hanisch-Blicharski ◽  
Verena Tinnemann ◽  
Simone Wall ◽  
Fabian Thiemann ◽  
Thorben Groven ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Phase Space ◽  
Nanoscale Heat Transfer ◽  
Equipartition Theorem

scholarly journals Heterodyne Optical Sampling for Picosecond Ultrasonics and Nanoscale Heat Transfer

2009 ◽  
Author(s):  
Eric Mottay ◽  
Pierre Rigail ◽  
Robert Braunschweig ◽  
Christophe Pierre ◽  
Sebastien Ermeneux ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Optical Sampling ◽  
Nanoscale Heat Transfer ◽  
Picosecond Ultrasonics

scholarly journals Nanoscale Heat Transfer: Heat Transport without Heating?—An Ultrafast X‐Ray Perspective into a Metal Heterostructure (Adv. Funct. Mater. 46/2020)

2020 ◽  
Vol 30 (46) ◽  
pp. 2070304
Author(s):  
Jan‐Etienne Pudell ◽  
Maximilian Mattern ◽  
Michel Hehn ◽  
Grégory Malinowski ◽  
Marc Herzog ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Heat Transport ◽  
X Ray ◽  
Nanoscale Heat Transfer

Jet emerging from an annular nozzle and impinging onto cylindrical cavity: Effect of jet velocity on flow structure and heat transfer rates

2008 ◽  
Vol 222 (6) ◽  
pp. 1021-1031 ◽  
Author(s):  
S Z Shuja ◽  
B S Yilbas ◽  
S M A Khan
Keyword(s):  
Heat Transfer ◽  
Flow Structure ◽  
Cylindrical Cavity ◽  
Substrate Material ◽  
Working Fluid ◽  
Cavity Surface ◽  
Annular Nozzle ◽  
Transfer Rates ◽  
Jet Velocity

In laser gas assisting processes, nozzles are used to accelerate the impinging gas and attain a proper flow structure to improve the quality of the end product. In this study, the jet emerging from an annular nozzle and impinging onto a cylindrical cavity is considered. The effects of jet velocity at nozzle exit onto the flow structure in the region of the cavity and heat transfer rates from the cavity surface are examined. To resemble the laser-produced cavity, the cavity wall temperature is kept elevated (almost the melting temperature of the substrate material). Reynolds stress turbulence model is exploited to account for the turbulence. In the simulations, four jet velocities, two outer angles of the annular nozzle, and two depths of the cylindrical cavity are employed while air is used for the working fluid. It is found that jet velocity has a significant effect on the heat transfer rates and skin friction, which is more pronounced with increasing cavity depths.

Photo-thermal effects in gold nanoparticles dispersed in thermotropic nematic liquid crystals

2015 ◽  
Vol 17 (31) ◽  
pp. 20281-20287 ◽  
Author(s):  
Luigia Pezzi ◽  
Luciano De Sio ◽  
Alessandro Veltri ◽  
Tiziana Placido ◽  
Giovanna Palermo ◽  
...  
Keyword(s):  
Heat Transfer ◽  
Gold Nanoparticles ◽  
Liquid Crystals ◽  
Thermal Effects ◽  
Nematic Liquid Crystals ◽  
Anisotropic Media ◽  
Nanoscale Heat Transfer

Investigation of nanoscale heat transfer in anisotropic media by combining the plasmonic properties of gold nanoparticles and the thermosensitivity of liquid crystals.

Sign in / Sign up

Export Citation Format

Share Document