Natural convection effects on heat transfer in a porous tissue in 3-D radiofrequency cardiac ablation

Wongchadakul, Patcharaporn; Datta, Ashim K.; Rattanadecho, Phadungsak

doi:10.1016/j.ijheatmasstransfer.2022.123832

Cited by 4 publications

(3 citation statements)

References 37 publications

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“…Governing equations for blood velocity and temperature profiles in the cardiac tissue treats the tissue as a porous medium. The transient momentum equations (Brinkman extended Darcy model) and transient energy equations are used for analyzation [ 54 ].…”

Section: Problem Formulation and Computational Methodologymentioning

confidence: 99%

Tissue poromechanical deformation effects on steam pop likelihood in 3-D radiofrequency cardiac ablation

Wongchadakul,

Datta,

Rattanadecho

2023

J Biol Eng

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Radiofrequency Cardiac Ablation (RFCA) is a common procedure that heats cardiac tissue to destroy abnormal signal pathways to eliminate arrhythmias. The complex multiphysics phenomena during this procedure need to be better understood to improve both procedure and device design. A deformable poromechanical model of cardiac tissue was developed that coupled joule heating from the electrode, heat transfer, and blood flow from normal perfusion and thermally driven natural convection, which mimics the real tissue structure more closely and provides more realistic results compared to previous models. The expansion of tissue from temperature rise reduces blood velocity, leading to increased tissue temperature, thus affecting steam pop occurrence. Detailed temperature velocity, and thermal expansion of the tissue provided a comprehensive picture of the process. Poromechanical expansion of the tissue from temperature rise reduces blood velocity, increasing tissue temperature. Tissue properties influence temperatures, with lower porosity increasing the temperatures slightly, due to lower velocities. Deeper electrode insertion raises temperature due to increased current flow. The results demonstrate that a 5% increase in porosity leads to a considerable 10% increase in maximum tissue temperature. These insights should greatly help in avoiding undesirable heating effects that can lead to steam pop and in designing improved electrodes.

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Section: Problem Formulation and Computational Methodologymentioning

confidence: 99%

Tissue poromechanical deformation effects on steam pop likelihood in 3-D radiofrequency cardiac ablation

Wongchadakul,

Datta,

Rattanadecho

2023

J Biol Eng

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“…Dong et al [12] simulated a natural convection around the dome in the passive containment air-cooling system. Wongchadakul et al [13] illustrated the natural convection effects in porous tissue in radiofrequency cardiac ablation (RFCA). They comprehensively explained the important natural convection influence on temperatures and blood flow during an RFCA treatment.…”

Section: Introductionmentioning

confidence: 99%

Numerical investigation of natural convection heat transfer using TiO₂/Al₂O₃-water nanofluids

Oulahou,

Elguennouni,

Hssikou

et al. 2024

FME Transactions

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Recently, nanofluids have been used as an alternative in several industries to improve the heat transfer process. This paper focuses on the numerical modeling of the performance of the natural convection process through TiO₂/Al₂O₃-water nanofluids in a square cavity containing a heated block. The lattice Boltzmann method is used in this study to present the nanofluid heat transfer enhancement. Results are presented in terms of streamlines, isothermal contours, and Nusselt number profiles. The findings demonstrate that by raising the Rayleigh number and solid nanoparticle concentration, the average Nusselt number increases, and they reveal that the heated block enormously affects the flow structure and heat transfer. It is also demonstrated that the type of nanoparticles significantly impacts the natural convection heat transfer.

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“…Dissecting the complex physicochemical environment of the staining system, we developed a highly optimized 3D staining imaging pipeline based on CUBIC. Based on our precise characterization of biological tissues as electrolyte gels (Susaki et al 2020), A mathematical model formulated for 3D coupled blood flow, heat transfer, and resistive heating in the cardiac chamber during the RFCA process for arrhythmia has been evaluated (Wongchadakul et al 2023).…”

mentioning

confidence: 99%

Simulation study of mobile phone radiation thermal effect in human heart tissue

Elwasife,

Radwan,

Yasin

2023

Multidiscip. Sci. J.

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The public's concern over potential health risks related to the absorption of electromagnetic radiation (EMR) has been developing due to the prolonged use of cell phones close to the human body, particularly the human heart. To address these issues, this study aims to present a numerical simulation of EMR in the spectral range (900 MHz, 1800 MHz, and 2400 MHz) on human heart tissue using a Matlab program and the Finite-Difference Time-Domain (FDTD) method in One Dimension (1D). A mathematical analysis of electromagnetic radiation heating equations in a one-dimensional, one-layer model has also been discussed by numerically calculating the transient bioheat transfer equation and Maxwell's equations by using the FDTD to predict the effects of thermal physics properties on the transient temperature of human heart tissue. The results revealed that FDTD is an efficient method to evaluate the thermal effect of EMR due to its perfect boundary condition. It was found that the heart tissue reacts more at 900 MHz compared to 1800 MHz and 2400 MHz, and the tissue absorption is higher at the lower frequency. The effects of various parameters on the temperature increase in the human heart tissue were considered, such as the electric field, magnetic field, thicknesses, and thermal conductivity of the heart tissue. It was found that the frequency most affecting the tissue was 900 MHz. Our study found that the temperature distribution decreases with an increase in tissue thickness. We note that the results are similar for the different frequencies. It turns out that as the thermal conductivity of the heart tissue increases, the temperature distribution decreases slightly, while no change occurs here in the relationship between thermal conductivity and the temperature distribution of tissue with the change in the frequency of a wave.

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Natural convection effects on heat transfer in a porous tissue in 3-D radiofrequency cardiac ablation

Cited by 4 publications

References 37 publications

Tissue poromechanical deformation effects on steam pop likelihood in 3-D radiofrequency cardiac ablation

Tissue poromechanical deformation effects on steam pop likelihood in 3-D radiofrequency cardiac ablation

Numerical investigation of natural convection heat transfer using TiO₂/Al₂O₃-water nanofluids

Simulation study of mobile phone radiation thermal effect in human heart tissue

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