Investigation of Thermal Distribution of Balloon Antenna MWA for Urethra Stricture Treatment

2018 ◽  
Author(s):  
Sinchai Jandang ◽  
Supan Tungjitkusolmun ◽  
Pattarapong Phasukkit
Keyword(s):  
Thermal Distribution ◽  
Urethra Stricture

scholarly journals A Thermally Conductive Pt/AAO Catalyst for Hydrogen Passive Autocatalytic Recombination

Catalysts ◽  
2021 ◽  
Vol 11 (4) ◽  
pp. 491
Author(s):  
Alina E. Kozhukhova ◽  
Stephanus P. du Preez ◽  
Aleksander A. Malakhov ◽  
Dmitri G. Bessarabov
Keyword(s):  
Electron Microscopy ◽  
Particle Size ◽  
Combustion Temperature ◽  
Volume Fraction ◽  
Morphological Characteristics ◽  
Al Alloy ◽  
Impregnation Method ◽  
Case Scenario ◽  
Worst Case ◽  
Thermal Distribution

In this study, a Pt/anodized aluminum oxide (AAO) catalyst was prepared by the anodization of an Al alloy (Al6082, 97.5% Al), followed by the incorporation of Pt via an incipient wet impregnation method. Then, the Pt/AAO catalyst was evaluated for autocatalytic hydrogen recombination. The Pt/AAO catalyst’s morphological characteristics were determined by scanning electron microscopy (SEM) and transmission electron microscopy (TEM). The average Pt particle size was determined to be 3.0 ± 0.6 nm. This Pt/AAO catalyst was tested for the combustion of lean hydrogen (0.5–4 vol% H2 in the air) in a recombiner section testing station. The thermal distribution throughout the catalytic surface was investigated at 3 vol% hydrogen (H2) using an infrared camera. The Al/AAO system had a high thermal conductivity, which prevents the formation of hotspots (areas where localized surface temperature is higher than an average temperature across the entire catalyst surface). In turn, the Pt stability was enhanced during catalytic hydrogen combustion (CHC). A temperature gradient over 70 mm of the Pt/AAO catalyst was 23 °C and 42 °C for catalysts with uniform and nonuniform (worst-case scenario) Pt distributions. The commercial computational fluid dynamics (CFD) code STAR-CCM+ was used to compare the experimentally observed and numerically simulated thermal distribution of the Pt/AAO catalyst. The effect of the initial H2 volume fraction on the combustion temperature and conversion of H2 was investigated. The activation energy for CHC on the Pt/AAO catalyst was 19.2 kJ/mol. Prolonged CHC was performed to assess the durability (reactive metal stability and catalytic activity) of the Pt/AAO catalyst. A stable combustion temperature of 162.8 ± 8.0 °C was maintained over 530 h of CHC. To confirm that Pt aggregation was avoided, the Pt particle size and distribution were determined by TEM before and after prolonged CHC.

scholarly journals Visualizing thermal distribution through hydrogel confined ionic system

iScience ◽  
2021 ◽  
Vol 24 (2) ◽  
pp. 102085
Author(s):  
Qinyuan Gui ◽  
Bin Fu ◽  
Yonglin He ◽  
Shanzhi Lyu ◽  
Yingchao Ma ◽  
...  
Keyword(s):  
Ionic System ◽  
Thermal Distribution

scholarly journals MHD squeezed Darcy–Forchheimer nanofluid flow between two h–distance apart horizontal plates

Open Physics ◽  
2020 ◽  
Vol 18 (1) ◽  
pp. 1100-1107
Author(s):  
Ghulam Rasool ◽  
Waqar A. Khan ◽  
Sardar Muhammad Bilal ◽  
Ilyas Khan
Keyword(s):  
Heat Flux ◽  
Fluid Flow ◽  
Velocity Field ◽  
Concentration Distribution ◽  
Numerical Data ◽  
Brownian Diffusion ◽  
Nanofluid Flow ◽  
Viscosity Parameter ◽  
Thermal Distribution ◽  
Factor Data

Abstract This research is mainly concerned with the characteristics of magnetohydrodynamics and Darcy–Forchheimer medium in nanofluid flow between two horizontal plates. A uniformly induced magnetic impact is involved at the direction normal to the lower plate. Darcy–Forchheimer medium is considered between the plates that allow the flow along horizontal axis with additional effects of porosity and friction. The features of Brownian diffusive motion and thermophoresis are disclosed. Governing problems are transformed into nonlinear ordinary problems using appropriate transformations. Numerical Runge–Kutta procedure is applied using MATLAB to solve the problems and acquire the data for velocity field, thermal distribution, and concentration distribution. Results have been plotted graphically. The outcomes indicate that higher viscosity results in decline in fluid flow. Thermal profile receives a decline for larger viscosity parameter; however, Brownian diffusion and thermophoresis appeared as enhancing factors for the said profile. Numerical data indicate that heat flux reduces for viscosity parameter. However, enhancement is observed in skin-friction for elevated values of porosity factor. Data of this paper are practically helpful in industrial and engineering applications of nanofluids.

A model for the time-dependent thermal distribution within an iceball surrounding a cryoprobe

1998 ◽  
Vol 43 (12) ◽  
pp. 3519-3534 ◽  
Author(s):  
John C Rewcastle ◽  
George A Sandison ◽  
Leszek J Hahn ◽  
John C Saliken ◽  
J Gregory McKinnon ◽  
...  
Keyword(s):  
Time Dependent ◽  
Thermal Distribution

Analysis of the Thermal Distribution Generated by a Thermal Patch to Evaluate Its Feasibility to Treat Patient’s Pain Relief

2019 ◽  
pp. 508-518
Author(s):  
Luis A. Castellanos-Rivera ◽  
Edgar A. Mandujano-García ◽  
Antonio Ruiz-Morán ◽  
Melany Barrón-Salazar ◽  
Benjamín A. Morales-Ruiz ◽  
...  
Keyword(s):  
Pain Relief ◽  
Thermal Distribution

Investigating Damping Performance of Laser Powder Bed Fused Components With Unique Internal Structures

2018 ◽  
Author(s):  
Onome Scott-Emuakpor ◽  
Tommy George ◽  
Brian Runyon ◽  
Casey Holycross ◽  
Bryan Langley ◽  
...  
Keyword(s):  
Loading Rate ◽  
Vibration Suppression ◽  
Forced Response ◽  
Laser Powder Bed Fusion ◽  
Powder Bed ◽  
Thermal Distribution ◽  
Internal Structures ◽  
Internal Feature ◽  
Feature Optimization ◽  
Damping Capability

An additive manufacturing (AM) process has been used to fabricate beam components with unique internal geometries capable of reducing weight and inherently suppressing vibration of the structure. Using the laser powder bed fusion (LPBF) AM process, four unique designs are investigated to quantify and understand the damping effectiveness of this manufacturing concept. Forced-response tests are conducted to validate the damping capability of each internal design configuration. The effects of external geometry, thermal distribution associated with internal friction, strain amplitude, and loading rate dependence on damping performance are studied. The results of the studied beams are compared to the damping performance of a fully-fused, or solid baseline LPBF beam. With only 1–4% internal beam volume alteration, the four unique beams are capable of providing up to ten times damping into their respective systems compared to the baseline, solid beam. From the studies of different parameter effects on damping, the main mechanism for vibration suppression is identified. Validation of the vibration suppression physics allows for internal feature optimization via LPBF that can maximize damping effectiveness.

scholarly journals The Numerical Techniques for Thermal Distribution Analysis in Optical Waveguides

2008 ◽  
Vol 4 (2) ◽  
Author(s):  
Maslina Yaacob ◽  
Mohd Haniff Ibrahim ◽  
Norazan Mohd Kassim ◽  
Abu Bakar Mohammad
Keyword(s):  
Heat Transfer ◽  
Cross Section ◽  
Optical Waveguides ◽  
Distribution Analysis ◽  
Heat Transfer Mechanism ◽  
Numerical Techniques ◽  
Planar Optical Waveguide ◽  
Thermal Distribution ◽  
Single Heater ◽  
Good Agreement

In this paper, the analysis of thermal distribution in planar optical waveguide cross-section when a single heater electrode applied is presented. Starting from the heat equation, the thermal analysis has been done using two proposed numerical methods which are include finite difference method (FDM) and finite element method (FEM). By considering conduction as the only heat transfer mechanism, the obtained results from the mentioned methods are shown to have a good agreement.

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