Thermal and mechanical design of reverting microchannels for cooling disk-shaped electronic parts using constructal theory

Dadsetani, Reza; Salimpour, Mohammad Reza; Tavakoli, Mohammad Reza; Goodarzi, Marjan; Filho, Ênio Pedone Bandarra

doi:10.1108/hff-06-2019-0453

Cited by 31 publications

(5 citation statements)

References 46 publications

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“…The finite volume method (FVM) [49,50] was used to solve the governing equation using the ANSYS FLUENT software package [51,52]. The equations were obtained for two-dimensional nanofluid flow by using a mixture model.…”

Section: Numerical Proceduresmentioning

confidence: 99%

Non-Isothermal Hydrodynamic Characteristics of a Nanofluid in a Fin-Attached Rotating Tube Bundle

Alazwari

Safaei

2021

Mathematics

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In the present study, a novel configuration of a rotating tube bundle was simulated under non-isothermal hydrodynamic conditions using a mixture model. Eight fins were considered in this study, which targeted the hydrodynamics of the system. An aqueous copper nanofluid was used as the heat transfer fluid. Various operating factors, such as rotation speed (up to 500 rad/s), Reynolds number (10–80), and concentration of the nanofluid (0.0–4.0%) were applied, and the performance of the microchannel heat exchanger was assessed. It was found that the heat transfer coefficient of the system could be enhanced by increasing the Reynolds number, the concentration of the nanofluid, and the rotation speed. The maximum enhancement in the heat transfer coefficient (HTC) was 258% after adding a 4% volumetric nanoparticle concentration to the base fluid and increasing Re from 10 to 80 and ω from 0 to 500 rad/s. Furthermore, at Re = 80 and ω = 500 rad/s, the HTC values measured for the nanofluid were 42.3% higher than those calculated for water, showing the nanoparticles' positive impact on the heat transfer paradigm. Moreover, it was identified that copper nanoparticles' presence had no significant effect on the system's pressure drop. This was attributed to the interaction of the fluid flow and circulated flow around the tubes. Finally, the heat transfer coefficient and pressure drop had no considerable changes when augmenting the rotation speed at high Reynolds numbers.

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Section: Numerical Proceduresmentioning

confidence: 99%

Non-Isothermal Hydrodynamic Characteristics of a Nanofluid in a Fin-Attached Rotating Tube Bundle

Alazwari

Safaei

2021

Mathematics

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“…Among the above, the two-phase liquid flow (i.e. nanofluid) microchannel cooling system emerged as a better alternative over other cooling techniques for higher power density devices (Dadsetani et al, 2020a(Dadsetani et al, , 2020bGoodarzi et al, 2020;Khosravi et al, 2021;Nikkhah et al, 2015). The nanofluid-based cooling system is suggested as a better alternative to other cooling techniques for microchannel (Bagherzadeh et al, 2019;Darzi et al, 2014;Nazarafkan et al, 2019).…”

Section: Introductionmentioning

confidence: 99%

Thermo-hydraulic and entropy generation investigation of nano-encapsulated phase change material (NEPCM) slurry in hybrid wavy microchannel

Doshi

Kashyap

Tiwari

2022

HFF

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Purpose This study aims to capture the heat transfer and entropy generation characteristics of temperature-dependent nano-encapsulated phase change material (NEPCM) slurry in a hybrid wavy microchannel. In addition, the effect of substrate material combined with NEPCM slurry on conjugate heat transfer condition is captured for different microchannel heat sinks. Design/methodology/approach A novel “hybrid wavy microchannel” is proposed to enhance the overall heat transfer and reduce the pressure drop by combining wavy and raccoon geometry. NEPCM–water slurry is implied in the hybrid wavy, conventional wavy and raccoon microchannel. A user-defined function (UDF) is used to observe the effect of phase-change of paraffin material in thermophysical properties of NEPCM–water nanofluid. All three (hybrid, wavy, raccoon) microchannels are engraved on a rectangular substrate of 1.8 mm width (ωs) and 30 mm length (L), respectively. For hybrid, wavy and raccoon microchannel, waviness (γ) of 0.067 is selected for the investigation. Findings The result shows that NEPCM particle presence reduces the fluid domain temperature. The thermal performance of proposed Heat sink 2 is found better than the Heat sink 1. The effect of the geometrical modification, wall thermal conductivity, different volumetric concentrations of nanoparticles (ϕ ∼ 1 – 5%) and Reynolds number (Re ∼ 100 – 500) on thermodynamic irreversibility is also observed. Additionally, the effect of thermal and frictional entropy generation is reduced with a combination of NEPCM slurry and higher conductive material for all heat sinks. Practical implications A combination of NEPCM slurry with laminar flow microchannel cooling system emerged as a better alternative over other cooling techniques for higher power density devices such as microprocessors, electronic radar systems, aerospace applications, semiconductors, power electronics in modern electronic vehicles, high power lasers, etc. Originality/value The phase-change process of the NEPCM slurry is tracked under conjugate heat transfer in a hybrid wavy microchannel. Furthermore, the phase-change process of NEPCM slurry is captured with different heat sink materials (SS316, silicon and copper) under conjugate heat transfer situation for different heat sinks and concentrations (ϕ ∼ 1–5) of NEPCM.

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“…The specific aim of the work is to compare the Poiseuille number and pumping power requirement of 3D microchannel texture elements for compressible slip low at different Reynolds numbers, Re = 50.31 and 1.01. This study would be useful in industrial cooling applications for heat transfer enhancement, , choking delay for mass transfer enhancement, high-altitude vehicles, vacuum, and biomedical devices.…”

Section: Introductionmentioning

confidence: 99%

Pumping Power Performance and Frictional Resistance of Textured Microchannels in Gaseous Slip Flows

Garg

Mujumdar

Agrawal

2021

Ind. Eng. Chem. Res.

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The investigation of pressure drop characteristics along the microchannels with surface texturing is crucial to arrive at a desired structural size and performance of a microchannel. This study presents the comparison of flow friction and pumping power for two different Reynolds numbers (Re = 1.01 and 50.31) for rarefied gas flows in textured microchannels. The three-dimensional microchannel is computationally modeled with ratios of the height of texture to the height of the microchannel taken as 20, 40, and 60% and texture shapes as rectangular, circular, and triangular. All simulations are conducted in the slip flow regime for the Knudsen number ranging from 1.10 × 10 −3 to 2.07 × 10 −2 and tangential momentum accommodation coefficient (TMAC) ranging from 0.1 to 0.9. The time-and cost-effective Taguchi statistical analysis of the L18 orthogonal array is carried out to find the efficiency of the textured microchannels in terms of Poiseuille number and pumping power per unit mass flow rate. It is found that the height of texture is the most important control factor for efficiency, while the shape is the least important factor for both Reynolds numbers. The second most significant factor for Re = 50.31 is the Knudsen number and that for Re = 1.01 is the TMAC. The present numerical work can be applied for designing micropiping systems and diffusers with lower pumping power, lower frictional resistance, and higher efficiency.

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Thermal and mechanical design of reverting microchannels for cooling disk-shaped electronic parts using constructal theory

Cited by 31 publications

References 46 publications

Non-Isothermal Hydrodynamic Characteristics of a Nanofluid in a Fin-Attached Rotating Tube Bundle

Non-Isothermal Hydrodynamic Characteristics of a Nanofluid in a Fin-Attached Rotating Tube Bundle

Thermo-hydraulic and entropy generation investigation of nano-encapsulated phase change material (NEPCM) slurry in hybrid wavy microchannel

Pumping Power Performance and Frictional Resistance of Textured Microchannels in Gaseous Slip Flows

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