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

Doshi, Shivam; Kashyap, Gopal; Tiwari, Nishant

doi:10.1108/hff-06-2021-0422

Cited by 25 publications

(8 citation statements)

References 55 publications

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“…Compared to other channels, zigzag channels exhibited increased heat dissipation and higher pressure drop. Doshi et al (2022) proposed a hybrid wavy microchannel to improve heat dissipation and minimize the pressure drop using the combination of wavy and raccoon channels. They carried out numerical simulations and used nano-encapsulated phase change material (PCM) as the fluid to remove the heat.…”

Section: Introductionmentioning

confidence: 99%

Thermal performance improvement in wavy microchannels using secondary channels

Paramanandam,

Srinivasan

et al. 2024

HFF

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Purpose This study aims to minimize the pressure drop across wavy microchannels using secondary branches without compromising its capacity to transfer the heat. The impact of secondary flows on the pressure drop and heat transfer capabilities at different Reynolds numbers are investigated numerically for different wavy microchannels. Finally, different channels are evaluated using performance evaluation criteria to determine their effectiveness. Design/methodology/approach To investigate the flow and heat transfer capabilities in wavy microchannels having secondary branches, a 3D conjugate heat transfer model based on finite volume method is used. In conventional wavy microchannel, secondary branches are introduced at crest and trough locations. For the numerical simulation, a single symmetrical channel is used to minimize computational time and resources and the flow within the channels remains single-phase and laminar. Findings The findings indicate that the suggested secondary channels notably improve heat transfer and decrease pressure drop within the channels. At lower flow rates, the secondary channels demonstrate superior performance in terms of heat transfer. However, the performance declines as the flow rate increased. With the same amplitude and wavelength, the introduction of secondary channels reduces the pressure drop compared with conventional wavy channels. Due to the presence of secondary channels, the flow splits from the main channel, and part of the core flow gets diverted into the secondary channel as the flow takes the path of minimum resistance. Due to this flow split, the core velocity is reduced. An increase in flow area helps in reducing pressure drop. Practical implications Many complex and intricate microchannels are proposed by the researchers to augment heat dissipation. There are challenges in the fabrication of microchannels, such as surface finish and achieving the required dimensions. However, due to the recent developments in metal additive manufacturing and microfabrication techniques, the complex shapes proposed in this paper are feasible to fabricate. Originality/value Wavy channels are widely used in heat transfer and micro-fluidics applications. The proposed wavy microchannels with secondary channels are different when compared to conventional wavy channels and can be used practically to solve thermal challenges. They help achieve a lower pressure drop in wavy microchannels without compromising heat transfer performance.

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Section: Introductionmentioning

confidence: 99%

Thermal performance improvement in wavy microchannels using secondary channels

Paramanandam,

Srinivasan

et al. 2024

HFF

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“…Golab et al (2021) used the finite volume method and SIMPLE algorithm to investigate natural convection inside a cavity for NEPCM nanoparticles in water. More investigations can be found in Sadeghi et al (2022), Mahmoud Aly et al (2022), Raizah and Aly (2021a, 2021b), Ghalambaz et al (2019a, 2019b), Ho et al (2020) and Doshi et al (2022).…”

Section: Introductionmentioning

confidence: 99%

Natural convection of NEPCM in a partial porous H-shaped cavity: ISPH simulation

Aly

Alsedais

2023

HFF

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Purpose This paper aims to investigate the conformable fractal approaches of unsteady natural convection in a partial layer porous H-shaped cavity suspended by nano-encapsulated phase change material (NEPCM) by the incompressible smoothed particle hydrodynamics method. Design/methodology/approach The partial hot sources with variable height L_Hot are in the H-cavity’s sides and center. The performed numerical simulations are obtained at the variations of the following parameters: source of hot length L_Hot = (0.4–1.6), conformable fractal parameter α (0.97–1), fusion temperature θf (0.05–0.9), thermal radiation parameter Rd (0–7), Rayleigh number Ra (103–106), Darcy parameter Da (10−2 to 10−5) and Hartmann number Ha (0–80). Findings The main outcomes showed the implication of hot source length L_Hot, Rayleigh number and fusion temperature in controlling the contours of a heat capacity within H-shaped cavity. The presence of a porous layer in the right zone of H-shaped cavity prevents the nanofluid flow within this area at lower Darcy parameter. An increment in the thermal radiation parameter declines the heat transfer and changes the heat capacity contours within H-shaped cavity. The velocity field is strongly enhanced by an augmentation on Rayleigh number. Increasing the Hartmann number shrinks the velocity field within H-shaped cavity. Originality/value The novelty of this work is solving the conformable fractal approaches of unsteady natural convection in a partial layer porous H-shaped cavity suspended by NEPCM.

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“…Various cooling methods are presented for dissipating the heat from electronic devices, same as heat pipes (Rama Narasimha et al , 2010), forced air cooling, thermo-electric cooling (Koh et al , 2015) and liquid-cooling systems (Prajapati, 2019; Alihosseini et al , 2020). To improve the performance of cooling systems, modern research has shifted to liquid technologies such as microchannel/pin-fin heat sinks (PFHSs) (Doshi et al , 2022; Paramanandam and Srinivasan, 2022). Tuckerman and Pease (1981) introduced microchannel heat sinks for the first time to solve the heat transfer issues in 1981.…”

Section: Introductionmentioning

confidence: 99%

A numerical study on thermo-hydraulic performance of micro pin-fin heat sink using hybrid pin-fins arrangement for electronic cooling devices

Bari

Targhi

Heyhat

2023

HFF

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Purpose This study aims to examine the effect of a combination of hybrid pin-fin patterns on a heat sink's performance using numerical techniques. Also, flow characteristics have been studied, such as secondary flow formation and flow-wall interaction. Design/methodology/approach In this study, the effect of hybrid arrangements of elliptical and hexagonal pin-fins with different distribution percentages on flow characteristics and performance evaluation criteria in laminar flow was investigated. Ansys-Fluent software solves the governing equations using the finite volume method. Also, the accuracy of obtained results was compared with the experimental results of other similar papers. Findings The results of this study highlighted that hybrid arrangements show higher overall performance than single pin-fin patterns. Among the hybrid arrangements, case 3 has the highest values of performance evaluation criteria, that is, 1.84 in Re = 900. The results revealed that, with the instantaneous change in the pattern from elliptic to hexagonal, the secondary flow increases in the cross-sectional area of the channels, and the maximum velocity in the cross-section of the channel increases. The important advantages of case 3 are its highest overall performance and a lower chip surface temperature of up to about 2% than other hybrid patterns. Originality/value Prior research has shown that in the single pin-fin pattern, the cooling power at the end of the heat sink decreases with increasing fluid temperature. Also, a review of previous studies showed that existing papers had not investigated hybrid pin-fin patterns by considering the effect of changing distribution percentages on overall performance, which is the aim of this paper.

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

Cited by 25 publications

References 55 publications

Thermal performance improvement in wavy microchannels using secondary channels

Thermal performance improvement in wavy microchannels using secondary channels

Natural convection of NEPCM in a partial porous H-shaped cavity: ISPH simulation

A numerical study on thermo-hydraulic performance of micro pin-fin heat sink using hybrid pin-fins arrangement for electronic cooling devices

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