Numerical and Experimental Study of Microchannel Performance on Flow Maldistribution

Joseph, Jojomon; Rehman, Danish; Delanaye, Michel; Morini, Gian Luca; Nacereddine, Rabia; Korvink, Jan G.; Brandner, Juergen J.

doi:10.3390/mi11030323

Cited by 11 publications

(5 citation statements)

References 28 publications

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“…Moreover, the passive control device can control the base pressure, which result in an improvement in the base pressure and mitigating the base drag. In addition, passive control is very effective and efficient whenever there is preferable pressure gradient at the nozzle exit [28,29]. The results demonstrated that presence of ring required increased inlet pressure for moving fluid through the nozzle as it increases the mean velocity and turbulence at the exit.…”

Section: Resultsmentioning

confidence: 97%

Determining the effect of nozzle groove on the fluid flow through viscous 2D planar fluid

Younis¹,

Ahmed²,

Hamdan³

et al. 2021

J Appl Eng Science

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The study aims to determine the effect of nozzle groove on fluid flow through viscous 2D planar fluid. To fulfil the study’s aim, numerical method was adopted to introduce grooves of different dimensions from the nozzle exit. The study adopts SoldWork software was used to design nozzles and introduce groove shaped nozzles, each consisting of six different designs. The nozzle base model used in this study was similar to the one used in a previous study. The procedure was performed with different pressures (8, 10, and 12 bar) at the similar firefighting nozzle. The velocities contours were predicted based on the choice of nozzle section during the numerical stimulation. The results of present study demonstrated a new approach that can be used for increasing velocity at various types of modified nozzles through grooves at different pressures and locations. For grooves, dimensions 1×1 (mm) and location 15 mm at 8 bar, 10 bar and 12 bars showed no effect on velocity as it reduces velocity by increasing surface area. The velocity increases with increasing pressure in proportion relationship. This clearly explains that the groove has no effect on velocity as it increases due to increase in pressure. This is because the groove reduces the velocity by increasing surface area. The study concludes that use of groove increases velocity of water that further improves nozzles operation.

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Section: Resultsmentioning

confidence: 97%

Determining the effect of nozzle groove on the fluid flow through viscous 2D planar fluid

Younis¹,

Ahmed²,

Hamdan³

et al. 2021

J Appl Eng Science

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show abstract

“…The uniform velocity distribution in parallel channels is essential for practical applications as velocity maldistribution may lead to an uneven heat exchange and an uneven product yield in the industrial production. 25 To solve this problem, the DW structure is adopted, in which the width of the flow channel section gradually reduces to achieve the same flow resistance in each branch. As shown in Figure 7b, the velocity distribution in all parallel flow channels of the DW structure is obviously more uniform.…”

Section: Effects Of Configurations Of the Heat Exchangementioning

confidence: 99%

Development of a Mini-Channel Heat Exchanger Reactor with Arborescent Structures for Fast Exothermic Reactions

Jiang

Yang

Zhang

et al. 2022

Ind. Eng. Chem. Res.

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Uniform flow distribution, efficient mixing of reactants, and rapid removal of reaction heat are very crucial to ensure a safe operation and high product yield for fast and highly exothermic reactions. In this study, a plate-type mini-channel heat exchanger reactor with arborescent structures (AR reactor) was developed. A numerical simulation is first performed to investigate the effects of the arborescent structures and configurations of heat exchange channels on the fluid flow and heat transfer characteristics. The simulation results show that the arborescent structure with smoothed junctions presents better heat transfer performance with a lower pressure drop than the original one with a rectangular cross-section, and more uniform flow rates and temperature distributions can be achieved when the parallel flow channels of the heat exchange plates are arranged based on the uniform flow resistance by adding two micropillars. A better AR reactor based on the simulation results was then fabricated, and its overall heat transfer coefficient was measured experimentally, which is in good agreement with the simulation data. The AR reactor is further utilized to conduct the nitration of phenol, and it is demonstrated that this reactor endows more aim product in a very short time in comparison with the traditional reactor. The insights gained here could provide a new avenue for the design of microchannel heat exchange reactors suitable for fast exothermic reactions.

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“…It has become one of the most promising technologies to solve thermal management problems in various electronics with high power density, and has been successfully applied to electronic chips and laser devices. After that, a large number of scholars proposed many improvement methods, such as turbulence structure [6,7], secondary flow [8,9], pulse flow [10,11], nanofluid [12,13], surface modification [14], and rough surface [15,16], from the directions of discussing heat exchange law [17,18], improving heat dissipation efficiency [19,20], improving flow field and temperature uniformity [21,22], and reducing pressure drop [23,24].…”

Section: Introductionmentioning

confidence: 99%

A Novel Manifold Dual-Microchannel Flow Field Structure with High-Performance Heat Dissipation

et al. 2022

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With the development of miniaturization and integration of electronic devices, the conventional manifold microchannels (MMCs) structure has been unable to meet the heat dissipation requirements caused by the rapid growth of internal heat flux. There is an urgent need to design a new heat dissipation structure with higher heat dissipation capacity to ensure the working stability and life of electronic devices. In this paper, we designed a novel manifold dual-microchannel (MDMC) cooling system that embedded the microchannel structure into the manifold microchannel structure. The MDMC not only has good heat dissipation performance that can meet the development needs of electronic equipment to miniaturization and integration, but also has a compact structure that does not increase the overall thickness and volume compared with MMC. The high temperature uniformity and heat transfer performance of MDMC are significantly improved compared to MMC. The Tmax is reduced by 13.6% and 17.5% at the heat flux density of 300 W/cm2 and 700 W/cm2, respectively. In addition, the influence of the inlet−2 velocity and the total microchannels number on the heat transfer performance of the MDMC structure are numerically investigated. The results show that the decrease rate of Tmax and ΔT is about 6.69% and 16% with the increase of inlet−2 velocity from 1.2 m/s to 2.4 m/s and microchannels number from 10 to 48, respectively. At the same time, the best temperature uniformity is obtained when the number of microchannels is 16.

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Numerical and Experimental Study of Microchannel Performance on Flow Maldistribution

Cited by 11 publications

References 28 publications

Determining the effect of nozzle groove on the fluid flow through viscous 2D planar fluid

Determining the effect of nozzle groove on the fluid flow through viscous 2D planar fluid

Development of a Mini-Channel Heat Exchanger Reactor with Arborescent Structures for Fast Exothermic Reactions

A Novel Manifold Dual-Microchannel Flow Field Structure with High-Performance Heat Dissipation

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