Temperature Distribution of Microwave Balloon Treatment Benign Prostatic Hyperplasia using Finite Element Model

Purpose This paper aims to fabricate inclined thin-walled components using positional wire and arc additive manufacturing (WAAM) and investigate the heat transfer characteristics of inclined thin-walled parts via finite element analysis method. Design/methodology/approach An inclined thin-walled part is fabricated in gas metal arc (GMA)-based additive manufacturing using a positional deposition approach in which the torch is set to be inclined with respect to the substrate surface. A three-dimensional finite element model is established to simulate the thermal process of the inclined component based on a general Goldak double ellipsoidal heat source and a combined heat dissipation model. Verification tests are performed based on thermal cycles of locations on the substrate and the molten pool size. Findings The simulated results are in agreement with experimental tests. It is shown that the dwell time between two adjacent layers greatly influences the number of the re-melting layers. The temperature distribution on both sides of the substrate is asymmetric, and the temperature peaks and temperature gradients of points in the same distance from the first deposition layer are different. Along the deposition path, the temperature distribution of the previous layer has a significant influence on the heat dissipation condition of the next layer. Originality/value The established finite element model is helpful to simulate and understand the heat transfer process of geometrical thin-walled components in WAAM.

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Two-dimensional finite element model to study temperature distribution in peripheral regions of extended spherical human organs involving uniformly perfused tumors

International Journal of Biomathematics ◽

10.1142/s1793524515500746 ◽

2015 ◽

Vol 08 (06) ◽

pp. 1550074 ◽

Cited By ~ 4

Author(s):

Akshara Makrariya ◽

Neeru Adlakha

Keyword(s):

Finite Element ◽

Temperature Distribution ◽

Finite Element Model ◽

Metabolic Activity ◽

Element Model ◽

The Body ◽

Tissue Response ◽

Two Dimensional ◽

Human Breast ◽

Peripheral Regions

Temperature as an indicator of tissue response is widely used in clinical applications. In view of above a problem of temperature distribution in peripheral regions of extended spherical organs of a human body like, human breast involving uniformly perfused tumor is investigated in this paper. The human breast is assumed to be spherical in shape with upper hemisphere projecting out from the trunk of the body and lower hemisphere is considered to be a part of the body core. The outer surface of the breast is assumed to be exposed to the environment from where the heat loss takes place by conduction, convection, radiation and evaporation. The heat transfer from core to the surface takes place by thermal conduction and blood perfusion. Also metabolic activity takes place at different rates in different layers of the breast. An elliptical-shaped tumor is assumed to be present in the dermis region of human breast. A finite element model is developed for a two-dimensional steady state case incorporating the important parameters like blood flow, metabolic activity and thermal conductivity. The triangular ring elements are employed to discretize the region. Appropriate boundary conditions are framed using biophysical conditions. The numerical results are used to study the effect of tumor on temperature distribution in the region.

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Design of a stimulation protocol to predict temperature distribution in subcutaneous tissue using the finite element model

Biomedical Engineering Letters ◽

10.1007/s13534-017-0029-0 ◽

2017 ◽

Vol 7 (3) ◽

pp. 261-266

Author(s):

Hyoun-Seok Myoung ◽

Dong-Hyun Kim ◽

Han-Sung Kim ◽

Kyoung-Joung Lee

Keyword(s):

Finite Element ◽

Temperature Distribution ◽

Finite Element Model ◽

Subcutaneous Tissue ◽

Element Model ◽

Stimulation Protocol ◽

The Finite Element Model

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Computational and Experimental Study of Temperature Distribution and Residual Stress in Butt-Joint TIG Welds

Key Engineering Materials ◽

10.4028/www.scientific.net/kem.480-481.459 ◽

2011 ◽

Vol 480-481 ◽

pp. 459-465

Author(s):

Kuang Hung Tseng ◽

Kuan Lung Chen

Keyword(s):

Experimental Data ◽

Residual Stress ◽

Finite Element ◽

Temperature Distribution ◽

Finite Element Model ◽

Power Distribution ◽

Plastic Material ◽

Element Model ◽

Butt Joint ◽

Material Behavior

This work conducted a non-linear finite element model associated with arc efficiency to simulate the temperature distribution and residual stress. A three-dimensional finite element analysis of temperature and stress in butt-joint TIG welds was performed using commercial software ANSYS. This model includes adjusting Gaussian distribution heat flux, alternating temperature dependent material properties, and managing thermal elasto-plastic material behavior. Computational results for both the temperature distribution and the residual stress are compared with available experimental data to confirm the accuracy of this technique. The simulated results of temperature distribution and residual stress are in good agreement with corresponding experimental data. The greatest value of this work does not lie in its ability to predict the magnitude and distribution of weld temperature and residual stress. Rather, this work proposed that prediction errors in a finite element model can be eliminated by modifying the arc power distribution function.

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