Heat transfer and flow characteristics of varying curvature wavy microchannels

Sharma, Ankur; Khan, Mohd. Kaleem

doi:10.1016/j.ijthermalsci.2022.108096

Cited by 18 publications

(2 citation statements)

References 38 publications

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“…Yao et al [ 12 ] studied the heat transfer and service life of the new W-type micro/small channel heat exchanger. Sharma and Khan [ 13 ] investigated the effect of variable curvature of wavy microchannels on heat transfer and flow characteristics. Compared with conventional channel heat exchanger, micro/ mini-channel heat exchanger are smaller and lighter, and the heat transfer is faster and more stable.…”

Section: Introductionmentioning

confidence: 99%

Numerical study on flow and heat transfer characteristics of rectangular mini-channel of interpolated double S turbulators

Xi,

Meng

2024

PLoS ONE

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In this study, we propose a new type of small-channel plug-in, the double S turbulators, for passive heat transfer enhancement to improve the flow and heat transfer performance of the fluid in the channel. In the range of Reynolds number 254.51~2545.09, under constant wall temperature heating conditions, the effects of interpolated double S turbulators with different long axial radii (1mm, 1.5mm, 2mm) on the average Nusselt number, pressure drop, total thermal resistance and field synergy number in the rectangular mini-channel were studied. The simulation results show that compared with the smooth rectangular mini-channel, after interpolating double S turbulators with different long axial radii (1mm, 1.5mm, 2mm), the average Nusselt number increased by 81.74%~101.74%, 71.29%~94.06%, 67.16%~88.48%, the total thermal resistance decreased by 45.1%~50.72%, 41.72%~48.74%, 40.28%~47.2%, and the number of field synergies increased by 85.58%~111.65%, 74.1%~102.6%, 69.64%~96.12%. At present, there are few studies on the boundary condition of constant wall temperature, and this paper supplements the research on this aspect. At the same time, the heat transfer performance of the rectangular mini-channel of the interpolated double S turbulators is stronger than that of the ordinary smooth rectangular mini-channel, which not only provides a new idea for the manufacture of micro heat dissipation equipment, but also improves the heat transfer performance of micro heat dissipation equipment and improves its work efficiency. According to the simulation data, the prediction formula of average Nusselt number and pressure drop was established by nonlinear regression method, which can be used to predict the flow and heat transfer characteristics of the rectangular mini-channel of the interpolated double S turbulators.

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Section: Introductionmentioning

confidence: 99%

Numerical study on flow and heat transfer characteristics of rectangular mini-channel of interpolated double S turbulators

Xi,

Meng

2024

PLoS ONE

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“…Ceramic materials have better temperature resistance, mechanical strength, and corrosion resistance, making them an ideal material to use as catalyst support in MSR microreactors for hydrogen production [ 11 , 12 , 13 ]. However, the brittleness and good corrosion resistance make it difficult to process ceramic materials via either traditional machining or chemical etching, and the micro size structure of the microchannels further increases the difficulty of manufacturing, limiting the application of ceramic materials in microchannel reactors to a certain extent [ 14 , 15 ]. In addition, the catalyst support needs to have a good catalyst adhesion ability, which generally requires the surface of the catalyst support to have some rough secondary microstructure so that the catalyst can be firmly loaded onto it, which furthers the manufacturing difficulty of the ceramic material.…”

Section: Introductionmentioning

confidence: 99%

Fabrication of Ceramic Microchannels with Periodic Corrugated Microstructures as Catalyst Support for Hydrogen Production via Diamond Wire Sawing

Li,

Gao,

Yuan

et al. 2024

Materials

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Hydrogen energy is the clean energy with the most potential in the 21st century. The microchannel reactor for methanol steam reforming (MSR) is one of the effective ways to obtain hydrogen. Ceramic materials have the advantages of high temperature resistance, corrosion resistance, and high mechanical strength, and are ideal materials for preparing the catalyst support in microchannel reactors. However, the structure of ceramic materials is hard and brittle, and the feature size of microchannel is generally not more than 1 mm, which is difficult to process using traditional processing methods. Diamond wire saw processing technology is mainly used in the slicing of hard and brittle materials such as sapphire and silicon. In this paper, a microchannel with a periodic corrugated microstructure was fabricated on a ceramic plate using diamond wire sawing, and then as a catalyst support when used in a microreactor for MSR hydrogen production. The effects of wire speed and feed speed on the amplitude and period size of the periodic corrugated microstructure were studied using a single-factor experiment. The microchannel surface morphology was observed via SEM and a 3D confocal laser microscope under different processing parameters. The microchannel samples obtained under different processing parameters were supported by a multiple impregnation method. The loading strength of the catalyst was tested via a strong wind purge experiment. The experimental results show that the periodic corrugated microstructure can significantly enhance the load strength of the catalyst. The microchannel catalyst support with the periodic corrugated microstructure was put into the microreactor for a hydrogen production experiment, and a good hydrogen production effect was obtained. The experimental results have a positive guiding effect on promoting ceramic materials as the microchannel catalyst support for the development of hydrogen energy.

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Performance analysis of minichannel heat sink with oblong cavities and diverse pin fin configurations

Mustafa,

Ghani

2024

Heat Trans

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Passive heat transfer techniques in minichannel heat sinks (MCHS) provide effective thermal management solutions for high heat flux applications. The current study introduces a three‐dimensional numerical analysis conducted to explore the flow and heat transfer characteristics of MCHS utilizing two passive techniques: incorporating pin fins with oblong‐shaped cavities. Four types of pin fin shapes were developed, including tear‐drop (MCOC‐TDPF), pyramidal (MCOC‐PPF), conical (MCOC‐CPF), and oval (MCOC‐OPF), respectively. The study is carried out under a laminar flow regime with Reynolds number ranging from 100 to 1000. The overall performance of these designs is assessed through a comparative analysis of traditional MCHS based on average Nusselt number, friction factor, and overall performance factor. Among these designs, MCOC‐CPF exhibited superior thermal performance compared to the other three configurations, with a maximum performance factor of 2.25 at a Reynolds number of 1000. Furthermore, the influence of conical pin fin taper ratio (β) on the thermal enhancement of MCOC‐CPF is also analyzed. Four values of conical pin fin taper ratio (β) have been considered, namely 1/6, 1/3, 1/2, and 2/3. The results revealed that β = 1/3 achieved an optimal overall performance of 2.39 at Reynolds number Re = 1000.

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Heat transfer and flow characteristics of varying curvature wavy microchannels

Cited by 18 publications

References 38 publications

Numerical study on flow and heat transfer characteristics of rectangular mini-channel of interpolated double S turbulators

Numerical study on flow and heat transfer characteristics of rectangular mini-channel of interpolated double S turbulators

Fabrication of Ceramic Microchannels with Periodic Corrugated Microstructures as Catalyst Support for Hydrogen Production via Diamond Wire Sawing

Performance analysis of minichannel heat sink with oblong cavities and diverse pin fin configurations

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