Thermal performance of optimized interrupted microchannel heat sink (IMCHS) using nanofluids

Tokit, Ernie Mat; Mohammed, Hussein A.; Yusoff, Mohd Zamri

doi:10.1016/j.icheatmasstransfer.2012.10.013

Cited by 59 publications

(12 citation statements)

References 35 publications

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“…Mat Tokitet al [48] analysed the thermal performance of optimised interrupted microchannel heat sink using nanofluids with n c =3. The particle diameter theytook are 30 nm to 60 nm; Nanofluid is of type Al 2 O 3 , CuO and SiO 2 at Reynold's number is ranging from 140-1034.…”

Section: Akimaro Kawaharaet Al [26]mentioning

confidence: 99%

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

2018

IJCTR

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The research era and development on two-phase flow boiling will give a tremendous choice in various application fields. In spite of this progression, there arise disarray forms under the different streams of thecross-section, oblique fins and types of fluid being used. This study deals on various cross-sections such as rectangular, square, triangle and with avariable aspect ratio of themicrochannel. The paper focuses on the behavior of different types of fluid used in amicrochannel with various thermo-physical properties. The formulated growth in the fields of flow boiling from the introductory to the modern changes is enumerated in both the ways of experimental as well as numerical. In addition to that, this paper concerns the bubble growth rate and heat transfer characteristics of flow boiling experiments. Numerical solutions and their correlations with their experimental data are also summarised. The stimulated improvements in various aspects of microchannel era in experimental and theoretical dataare tabulated. Based on the consolidated database a new model approach on two-phase flow boiling has resulted out.

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Section: Akimaro Kawaharaet Al [26]mentioning

confidence: 99%

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

2018

IJCTR

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“…Al 2 O 3 -water nanofluids are selected as working substances in this study [29,30], which are assumed as the mixtures of base fluid (water) and Al 2 O 3 nanoparticle with 30 nm diameter. The physical properties of the base fluid and Al 2 O 3 nanoparticle [31,32] are shown in Table 1, in which the reference temperature is 293 K. A single-phase model [33] is used to evaluate the physical properties of Al 2 O 3 -water nanofluids, and based on the assumptions that the aluminium oxide nanoparticle is spherical and homogeneously suspended in the base fluid, the following models are used to compute density, specific heat, dynamic viscosity, and thermal conductivity, respectively.…”

Section: Physical Properties Of Nanofluidsmentioning

confidence: 99%

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

Xie

Zhang

et al. 2016

Entropy

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Abstract:The heat transfer enhancement and entropy generation of Al 2 O 3 -water nanofluids laminar convective flow in the microchannels with flow control devices (cylinder, rectangle, protrusion, and v-groove) were investigated in this research. The effects of the geometrical structure of the microchannel, nanofluids concentration ϕ(0%-3%), and Reynolds number Re (50-300) were comparatively studied by means of performance parameters, as well as the limiting streamlines and temperature contours on the modified heated surfaces. The results reveal that the relative Fanning frictional factor f/f 0 of the microchannel with rectangle and protrusion devices are much larger and smaller than others, respectively. As the nanofluids concentration increases, f/f 0 increases accordingly. For the microchannel with rectangle ribs, there is a transition Re for obtaining the largest heat transfer. The relative Nusselt number Nu/Nu 0 of the cases with larger nanofluids concentration are greater. The microchannels with cylinder and v-groove profiles have better heat transfer performance, especially at larger Re cases, while, the microchannel with the protrusion devices is better from an entropy generation minimization perspective. Furthermore, the variation of the relative entropy generation S 1 /S 1 0 are influenced by not only the change of Nu/Nu 0 and f/f 0 , but also the physical parameters of working substances.

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“…It was presented that the helix radius and inner tube diameter affected the performance of the helically coiled tube heat exchanger. Tokit et al [22] analyzed the laminar fluid flow and heat transfer performance in the interrupted micro-channel heat sink using nanofluids. The Al 2 O 3 , CuO, and SiO 2 nanoparticles of nanoparticle diameter in the range of, 30 nm to 60 nm immersed in pure water with volume fraction in the range of 1% to 4% were used as nanofluid in this study.…”

Section: Introductionmentioning

confidence: 99%

Three-dimensional computational fluid dynamics modeling of TiO2/R134a nanorefrigerant

Arslan

2017

Therm sci

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In this study, numerical investigations were carried out for R134a based TiO 2 nanorefrigerants. Forced laminar flow and heat transfer of nanorefrigerants in a horizontal smooth circular cross-sectioned duct were investigated under steady-state condition. The nanorefrigerants consist of TiO 2 nanoparticles suspended in R134a as a base fluid with four nanoparticle volume fractions of 0.0, 0.8, 2.0, and 4.0%. Numerical studies were performed under laminar flow conditions where Reynolds numbers range from 8•10 2 to 2.2•10 3. Flow is flowing in the duct with hydrodynamically and thermally developing (simultaneously developing flow) condition. The uniform surface heat flux with uniform peripheral wall heat flux (H2) boundary condition was applied on the duct wall. Commercial CFD software, ANSYS Fluent 14.5, was used to carry out the numerical study. Effect of nanoparticle volume fraction on the average convective heat transfer coefficient and average Darcy friction factor were analyzed. It is obtained in this study that increasing nanoparticle volume fraction of nanorefrigerant increases the convective heat transfer in the duct, however, increasing nanoparticle volume fraction does not influence the pressure drop in the duct. The velocity and temperature distribution in the duct for different Reynolds numbers and nanoparticle volume fractions were presented.

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Thermal performance of optimized interrupted microchannel heat sink (IMCHS) using nanofluids

Cited by 59 publications

References 35 publications

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

Review on two-phase flow boiling in oblique fined microchannel heat sink with different channel cross section

Heat Transfer Enhancement and Entropy Generation of Nanofluids Laminar Convection in Microchannels with Flow Control Devices

Three-dimensional computational fluid dynamics modeling of TiO2/R134a nanorefrigerant

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