Femtogram-Level Thermophysical Property Measurement of Polymeric Samples Using Heated Microcantilevers

2011 ◽  
Author(s):  
Andrew M. Gauffreau ◽  
Keunhan Park
Keyword(s):  
Thermophysical Property ◽  
Computational Cost ◽  
Thermal Conductance ◽  
Element Analysis ◽  
Modified Model ◽  
Fea Model ◽  
Order Of Magnitude ◽  
Property Measurement ◽  
Polymeric Samples ◽  
Thermophysical Property Measurement

This article investigates thermophysical property measurement of femtogram-level polymeric samples by using the 3ω method on a heated microcantilever probe. A localized thermal scooping method was employed to acquire 449 fg of polyethylene terephthalate (PET) sample, measured gravimetrically, directly onto the heater of the cantilever. It is shown that the sample case has a 3ω signal that is smaller in magnitude than the bare case, suggesting that sample properties could be determined using the processes discussed here. A finite element analysis (FEA) model was also developed to compute the steady periodic behavior of the cantilever in the frequency domain. In order to drastically reduce the computational cost and consider the transient effect of the surrounding air, the FEA model implements the complex thermal conductance of the air as the boundary condition rather than modeling the air as a separate domain. The comparison of the modified model with the model that includes the air in the system reveals that the running time has improved by one order of magnitude while showing excellent agreement. The obtained results will expand the characterization and functionality of microcantilevers leading to advancements in localized thermal analysis.

scholarly journals Efficiently Simulating an Endograft Deployment: A Methodology for Detailed CFD Analyses

2020 ◽  
Vol 48 (10) ◽  
pp. 2449-2465
Author(s):  
Faidon Kyriakou ◽  
Craig Maclean ◽  
William Dempster ◽  
David Nash
Keyword(s):  
Numerical Models ◽  
Flow Analysis ◽  
Endovascular Aneurysm Repair ◽  
Computational Cost ◽  
Element Analysis ◽  
Fea Model ◽  
Order Of Magnitude ◽  
Modelling Methodology ◽  
Computationally Intensive ◽  
Cfd Analyses

Abstract Numerical models of endografts for the simulation of endovascular aneurysm repair are increasingly important in the improvement of device designs and patient outcomes. Nevertheless, current finite element analysis (FEA) models of complete endograft devices come at a high computational cost, requiring days of runtime, therefore restricting their applicability. In the current study, an efficient FEA model of the Anaconda™ endograft (Terumo Aortic, UK) was developed, able to yield results in just over 4 h, an order of magnitude less than similar models found in the literature. The model was used to replicate a physical device that was deployed in a 3D printed aorta and comparison of the two shapes illustrated a less than 5 mm placement error of the model in the regions of interest, consistent with other more computationally intensive models in the literature. Furthermore, the final goal of the study was to utilize the deployed fabric model in a hemodynamic analysis that would incorporate realistic fabric folds, a feature that is almost always omitted in similar simulations. By successfully exporting the deployed graft geometry into a flow analysis, it was illustrated that the inclusion of fabric wrinkles enabled clinically significant flow patterns such as flow stagnation and recirculation to be detected, paving the way for this modelling methodology to be used in future for stent design optimisation.

scholarly journals Development of Thermophysical Property Measurement for Liquid Fe Using Noncontact Laser Modulation Calorimetry

2010 ◽  
Vol 96 (12) ◽  
pp. 673-682 ◽  
Author(s):  
Kazutoshi Sugie ◽  
Hidekazu Kobatake ◽  
Hiroyuki Fukuyama ◽  
Yuya Baba ◽  
Ken-ichi Sugioka ◽  
...  
Keyword(s):  
Thermophysical Property ◽  
Laser Modulation ◽  
Property Measurement ◽  
Thermophysical Property Measurement
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