scholarly journals Thermal transport in nanoporous holey silicon membranes investigated with optically induced transient thermal gratings

2020 ◽  
Vol 128 (23) ◽  
pp. 235106
Author(s):  
Ryan A. Duncan ◽  
Giuseppe Romano ◽  
Marianna Sledzinska ◽  
Alexei A. Maznev ◽  
Jean-Philippe M. Péraud ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Silicon Membranes ◽  
Transient Thermal ◽  
Optically Induced

Measurements of Inter-and-Intra Device Transient Thermal Transport on SOI FETs

2007 ◽  
Author(s):  
P. M. Solomon ◽  
M. Shamsa ◽  
K. A. Jenkins ◽  
C. P. D'Emic ◽  
A. A. Balandin ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Transient Thermal

Native-oxide limited cross-plane thermal transport in suspended silicon membranes revealed by scanning thermal microscopy

2017 ◽  
Vol 111 (6) ◽  
pp. 063106 ◽  
Author(s):  
A. M. Massoud ◽  
J.-M. Bluet ◽  
V. Lacatena ◽  
M. Haras ◽  
J.-F. Robillard ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Native Oxide ◽  
Scanning Thermal Microscopy ◽  
Thermal Microscopy ◽  
Silicon Membranes

Phonon energy inversion in graphene during transient thermal transport

2013 ◽  
Vol 377 (9) ◽  
pp. 721-726 ◽  
Author(s):  
Jingchao Zhang ◽  
Xinwei Wang ◽  
Huaqing Xie
Keyword(s):  
Thermal Transport ◽  
Phonon Energy ◽  
Transient Thermal

Thermal Modeling of a Wireline Tool for Ultra-High Temperatures

2014 ◽  
Author(s):  
Aritra Sur ◽  
Babak Kouchmeshky ◽  
Rajani Satti
Keyword(s):  
High Temperature ◽  
Thermal Transport ◽  
Operating Time ◽  
Future Generation ◽  
Critical Threshold ◽  
Heat Flow Rate ◽  
Electronic Components ◽  
Transient Thermal ◽  
Electronic Parts ◽  
Sensitive Parameters

The drive to obtain more accurate petrophysical information from deeper wells has led to the demand for operating various downhole tools at higher temperatures for longer time periods. If the borehole temperature reaches values higher than 175°C, it is considered a high temperature (HT) well. In HT wells, reliability of the electronic components of the logging tools is a major concern. One way to address the concern is through using a thermal flask to reduce the heat flow rate from the formation to the tool and evenly distribute the heat generated by the internal electronic components. Optimizing the design of the aforementioned thermal flask is very important in providing a longer operative time for the tool before the temperature of the sensitive electronic parts reaches a critical threshold. To obtain the sensitive parameters for designing the flask, the thermal transport inside the tool must be accurately modeled. In this work, high fidelity FEA and CFD-based transient thermal models are developed for thermal transport in a flask for an ultra-high temperature wireline tool. Two models with different levels of complexity are presented. The models are verified by experimental results and the physical insights obtained from them presented. The predictive capability of the models is used to provide recommendations for safe operating time for various environmental conditions which prevail in the formations. The results obtained from the models can also be used for optimizing the performance of the future generation of the tool and reducing the amount of time spent in unnecessary trip outs.

scholarly journals Thermal transport in suspended silicon membranes measured by laser-induced transient gratings

AIP Advances ◽  
2016 ◽  
Vol 6 (12) ◽  
pp. 121903 ◽  
Author(s):  
A. Vega-Flick ◽  
R. A. Duncan ◽  
J. K. Eliason ◽  
J. Cuffe ◽  
J. A. Johnson ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Silicon Membranes ◽  
Transient Gratings

Investigation of Thermal Properties in Thin Films With the Transient Thermo-Reflectance Technique

2004 ◽  
Author(s):  
Patrick Hopkins ◽  
Pamela Norris
Keyword(s):  
Thermal Properties ◽  
Transport Properties ◽  
Silicon Germanium ◽  
Thermal Transport ◽  
Bulk Material ◽  
Thermal Response ◽  
Electron Beam Evaporation ◽  
Small Time ◽  
Thermal Transport Properties ◽  
Transient Thermal

The reliability of micro-electronic devices depends on the thermal properties and energy transfer of the thin metallic films used in them. Within the thin film structures thermal transport properties often differ from bulk material and can be highly dependent on the manufacturing techniques. Thermal transport properties can be measured by the Transient ThermoReflectance technique (TTR). The TTR method uses an ultra-short laser pulse to generate a transient thermal response, and a weaker probe pulse to monitor the reflectivity response of the surface. The changes in reflectivity can be related to transient thermal effects in the film. With the use of an ultra short-pulsed laser, the extremely small time scale required to observe the microscale heat transfer phenomena is possible. The goal of this research is to observe and quantify the effect of differing substrates, film thicknesses, and deposition methods on thermal conductivity. This study uses the TTR technique to examine nickel films of varying thicknesses, fabricated on silicon, germanium, and gallium arsenide substrates, using electron beam evaporation and sputtering techniques. The thermal conductivities of the films were measured and compared.

Influence of Superhydrophobic Walls on the Thermal Transport to Liquid Droplets

2011 ◽  
Author(s):  
D. Maynes ◽  
N. Tullett ◽  
R. Nielson ◽  
J. Vanderhoff ◽  
B. W. Webb
Keyword(s):  
Thermal Transport ◽  
Saturation Temperature ◽  
Thermal Response ◽  
Superhydrophobic Surfaces ◽  
Hydrophilic Surface ◽  
Liquid Droplets ◽  
Transfer Coefficients ◽  
Surface Temperatures ◽  
Order Of Magnitude ◽  
Transient Thermal

This paper presents an experimental investigation of the thermal transport to liquid droplets resting on heated horizontal superhydrophobic surfaces. The superhydrophobic surfaces considered here exhibit alternating micro-ribs and cavities. Specifically, we consider the transient thermal response to water droplets as they are placed on heated superhydrophobic surfaces. For comparative purpose we also consider the same scenario with smooth hydrophobic and smooth hydrophilic surfaces. Experiments were conducted over a range of surface temperatures varying from 60 to 165 °C. The results show radically different behavior in the transient thermal transport for the three surface types considered. At all temperatures the total droplet evaporation time on the superhydrophobic surfaces was nearly an order of magnitude greater than on the smooth hydrophilic surface. At temperatures elevated above the saturation temperature, where vigorous boiling was evident on the hydrophilic surface, the droplets on the superhydrophobic surfaces remained at bulk temperatures significantly lower than the saturation temperature. Further, the droplets on the superhydrophobic surfaces exhibited Leidenfrost-like behavior at surface temperatures far below the typical Leidenfrost point. Analysis of the data reveals overall heat transfer coefficients that are much lower on the superhydrophobic surfaces than on the other surfaces, over the entire range of temperatures explored.

scholarly journals Tuning Thermal Transport in Ultrathin Silicon Membranes by Surface Nanoscale Engineering

ACS Nano ◽  
2015 ◽  
Vol 9 (4) ◽  
pp. 3820-3828 ◽  
Author(s):  
Sanghamitra Neogi ◽  
J. Sebastian Reparaz ◽  
Luiz Felipe C. Pereira ◽  
Bartlomiej Graczykowski ◽  
Markus R. Wagner ◽  
...  
Keyword(s):  
Thermal Transport ◽  
Silicon Membranes
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