Experimental and numerical study on microwave heating of nanofluids

Jacob, Robin; Basak, Tanmay; Das, Sarit K.

doi:10.1016/j.ijthermalsci.2012.03.015

Cited by 29 publications

(6 citation statements)

References 54 publications

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“…But these parametric differences between normal tissue phantom and nanocomposite tissue phantom are not apparently large because the volume concentration of particles is small. The thermophysical and dielectric properties of Al 2 O 3 are taken from the literature [34]. Due to lack of robust data set for TiO 2 at 2450 MHz, the simulation is carried out for Al 2 O 3 infused tumors only.…”

Section: Thermo-physical and Dielectric Properties Of Nanoparticle Mi...mentioning

confidence: 99%

“…Further, the aspects of thermal damage to neighboring healthy tissues during MWA require strong attention to minimize post-treatment loss of health and alleviate patient comfort levels. In recent years, the microwave oven (a common kitchen appliance) has gained momentum in research involv-ing heating of biomass and biomaterials [28,29,30,31,32,33], of nanocolloids [34], and of other types of materials [35,36,37,38] Since the domestic oven operates at 2450 MHz (the most common frequency for MWA), it provides an inexpensive yet very realistic method to study MWA.…”

Section: Introductionmentioning

confidence: 99%

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Thermal Response of Dielectric Nanoparticle Infused Tissue Phantoms during Microwave Assisted Hyperthermia

Kumar¹,

Dhar²,

Paul³

2020

Preprint

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Hyperthermia has been in use for many years; as a potential alternative modality for cancer treatment. In this paper, an experimental investigation of microwave assisted thermal heating (MWATH) of tissue phantom using a domestic microwave oven has been reported. Computer simulations using finite element method based tools was also carried out to support the experimental observations and probe insight on the thermal transport aspects deep within the tissue phantom. A good agreement between predicted and measured temperature were achieved. Furthermore, experiments were conducted to investigate the efficacy of dielectric nanoparticles viz. alumina (Al 2 O 3 ) and titanium oxide (TiO 2 ) during the MWATH of nanoparticle infused tumor phantoms. A deep seated tumor injected with nanoparticle solution was specifically mimicked in the experiments. Interesting results were obtained in terms of spatiotemporal thermal history of the nanoparticle infused tissue

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Section: Thermo-physical and Dielectric Properties Of Nanoparticle Mi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Thermal Response of Dielectric Nanoparticle Infused Tissue Phantoms during Microwave Assisted Hyperthermia

Kumar¹,

Dhar²,

Paul³

2020

Preprint

View full text Add to dashboard Cite

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“…They concluded that the heat transfer coefficient increases significantly with decreasing the nanoparticles mean diameter. Jacob et al [26] applied the Euler-Lagrange approach to studying natural convection of Al 2 O 3 -water nanofluid. The authors demonstrated that the numerical results are consistent with the experimental ones.…”

Section: Introductionmentioning

confidence: 99%

A numerical study of heat transfer characteristics of CuO–water nanofluid by Euler–Lagrange approach

Bahiraei

2015

J Therm Anal Calorim

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The two-phase Euler-Lagrange method is used here to study heat transfer characteristics of the CuO-water nanofluid in a straight tube under laminar flow regime. The comparison between two-phase and single-phase approaches shows that the Euler-Lagrange method presents more accurate results. The convective heat transfer coefficient increases with increment of particle concentration. Moreover, the amount of heat transfer enhancement increases along the tube length. The thermophoretic and Brownian forces affect the convective heat transfer and their effects become more prominent at greater distances from the tube inlet. In addition, the effects of these two forces on the convective heat transfer intensify at higher concentrations. The results obtained from the two-phase simulation reveal a higher particle concentration at the central regions as compared to regions near the wall. This can be one of the reasons for higher convective heat transfer coefficient obtained from the two-phase method in comparison with the single-phase approach. At low volume fraction, the nanofluid bulk temperature along the tube length obtained from single-phase and two-phase approaches does not differ considerably. However, at high volume fraction, the single-phase method is unable to predict the bulk temperature accurately. This can be attributed to the more intense interaction between the fluid and nanoparticles at higher concentrations.

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“…Therefore, cooling methods have transformed from natural convection to forced convection, and coolants have transformed from one phase coolants to two phase and nanofluid coolants in the literature. [5][6][7][8][9][10] Literature also shows that embedding high-conductivity pathways increases the overall thermal conductance of a heat generating domain. However, current literature only discusses how this high-conductivity material should be distributed in a uniformly heated domain.…”

Section: Introductionmentioning

confidence: 99%

The natural emergence of asymmetric tree-shaped pathways for cooling of a non-uniformly heated domain

Çetkin

Oliani

2015

Journal of Applied Physics

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Here, we show that the peak temperature on a non-uniformly heated domain can be decreased by embedding a high-conductivity insert in it. The trunk of the high-conductivity insert is in contact with a heat sink. The heat is generated non-uniformly throughout the domain or concentrated in a square spot of length scale 0.1 L 0 , where L 0 is the length scale of the non-uniformly heated domain. Peak and average temperatures are affected by the volume fraction of the high-conductivity material and by the shape of the high-conductivity pathways. This paper uncovers how varying the shape of the symmetric and asymmetric high-conductivity trees affects the overall thermal conductance of the heat generating domain. The tree-shaped high-conductivity inserts tend to grow toward where the heat generation is concentrated in order to minimize the peak temperature, i.e., in order to minimize the resistances to the heat flow. This behaviour of high-conductivity trees is alike with the root growth of the plants and trees. They also tend to grow towards sunlight, and their roots tend to grow towards water and nutrients. This paper uncovers the similarity between biological trees and high-conductivity trees, which is that trees should grow asymmetrically when the boundary conditions are non-uniform. We show here even though all the trees have the same objectives (minimum flow resistance), their shape should not be the same because of the variation in boundary conditions. To sum up, this paper shows that there is a high-conductivity tree design corresponding to minimum peak temperature with fixed constraints and conditions. This result is in accord with the constructal law which states that there should be an optimal design for a given set of conditions and constraints, and this design should be morphed in order to ensure minimum flow resistances as conditions and constraints change. V C 2015 AIP Publishing LLC.

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Experimental and numerical study on microwave heating of nanofluids

Cited by 29 publications

References 54 publications

Thermal Response of Dielectric Nanoparticle Infused Tissue Phantoms during Microwave Assisted Hyperthermia

Thermal Response of Dielectric Nanoparticle Infused Tissue Phantoms during Microwave Assisted Hyperthermia

A numerical study of heat transfer characteristics of CuO–water nanofluid by Euler–Lagrange approach

The natural emergence of asymmetric tree-shaped pathways for cooling of a non-uniformly heated domain

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