Performance assessment of a triangular microchannel active magnetic regenerator

Liang, Jierong; Engelbrecht, Kurt; Nielsen, Kaspar Kirstein; Loewe, Konrad; Vieyra, Hugo A.; Barcza, Alexander

doi:10.1016/j.applthermaleng.2020.116519

Cited by 32 publications

(4 citation statements)

References 63 publications

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“…The large pressure drop of packed bed AMRs will confine any efficiency optimization, particularly at low fluid blow fractions. Thin parallel plates [60,61] and microchannels [62] are alternative regenerator geometries with decreased flow resistance that can provide better system efficiency at higher utilizations.…”

Section: Pressure Drop and System Power Consumptionmentioning

confidence: 99%

Improving magnetic cooling efficiency and pulldown by varying flow profiles

Masche

Liang

Engelbrecht

et al. 2022

Applied Thermal Engineering

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Section: Pressure Drop and System Power Consumptionmentioning

confidence: 99%

Improving magnetic cooling efficiency and pulldown by varying flow profiles

Masche

Liang

Engelbrecht

et al. 2022

Applied Thermal Engineering

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“…Many studies have focused on optimizing the specific parameters that affect microchannel performance in an effort to boost overall performance. Circular [19], rectangular [20], square [21], and triangular [22] cross-sections have all been taken into account, as well as water [23], air [24], and nanofluids [25] as working fluids, silicon [26] and copper [27] as materials, and staggered [28], porous [29], ribbed [30], and sinusoidal [31] as roughnesses of the surface. At present, the majority of studies aim to understand the effects of specific factors on the performance of microchannels.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Management System Employing Single-Phase Water Flow through Microchannels with Micro-Inserts Added Aiming for Performance Improvement

Kumar

Singh

2023

Processes

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A microchannel heat exchanger effectively evacuates heat from a confined space. This paper attempts to gain insight into the combinatorial repercussions of simultaneously coupling two factors that affect a microchannel’s performance, of which channel size and micro-insert complexity are the two main contributors. With water as the working fluid, an ANSYS-based numerical analysis was carried out for two distinct channel sizes, 1 and 2 mm, both with and without micro-inserts. The Reynolds numbers varied between 125 and 4992 and between 250 and 9985 for the 1 and 2 mm channels, respectively. For the 2 mm diameter channel, adding micro-inserts raised the overall pressure drop with increased Reynolds number. The inclusion of micro-inserts increased the pressure drop in the 1 mm channel at first, and thereafter the pressure drop decreased. Incorporating micro-inserts into the channel resulted in enhanced heat transfer. The trade-off between enhanced heat transfer performance and a larger pressure drop was calculated by evaluating the channel’s overall performance using the thermal performance factor. Micro-inserts were found to be most useful for improving overall performance in the low-to-moderate Reynolds number range, and their effectiveness increased with decreasing channel size. Changing the channel diameter and structure of the design can improve heat transmission through microchannels.

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“…The passage of MCHS has been explored, such as channel shape in the wavy form [ 20 ] and tapered form [ 21 ]. Additionally, the cross-section of the passage in the following shapes—circular [ 22 ], wedge [ 23 ], rectangular [ 24 ], triangular [ 25 ] and square [ 26 ]—have been exploited. Further, the effect of surface modification in a passage in the form of fins [ 27 ], ribs [ 28 ], fillets [ 29 ], dimples [ 30 ], sinusoidal wavy [ 31 ] and periodic expansion–constriction [ 32 ] have been explored and investigated.…”

Section: Introductionmentioning

confidence: 99%

Analysis of Microchannel Heat Sink of Silicon Material with Right Triangular Groove on Sidewall of Passage

et al. 2022

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Microchannel heat sink (MCHS) is a promising solution for removing the excess heat from an electronic component such as a microprocessor, electronic chip, etc. In order to increase the heat removal rate, the design of MCHS plays a vital role, and can avoid damaging heat-sensitive components. Therefore, the passage of the MCHS has been designed with a periodic right triangular groove in the flow passage. The motivation for this form of groove shape is taken from heat transfer enhancement techniques used in solar air heaters. In this paper, a numerical study of this new design of microchannel passage is presented. The microchannel design has five variable groove angles, ranging from 15° to 75°. Computational fluid dynamics (CFD) is used to simulate this unique microchannel. Based on the Navier–Stokes and energy equations, a 3D model of the microchannel heat sink was built, discretized, and laminar numerical solutions for heat transfer, pressure drop, and thermohydraulic performance were derived. It was found that Nusselt number and thermo-hydraulic performance are superior in the microchannel with a 15° groove angle. In addition, thermohydraulic performance parameters (THPP) were evaluated and discussed. THPP values were found to be more than unity for a designed microchannel that had all angles except 75°, which confirm that the proposed design of the microchannel is a viable solution for thermal management.

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Performance assessment of a triangular microchannel active magnetic regenerator

Cited by 32 publications

References 63 publications

Improving magnetic cooling efficiency and pulldown by varying flow profiles

Improving magnetic cooling efficiency and pulldown by varying flow profiles

Thermo-Hydraulic Management System Employing Single-Phase Water Flow through Microchannels with Micro-Inserts Added Aiming for Performance Improvement

Analysis of Microchannel Heat Sink of Silicon Material with Right Triangular Groove on Sidewall of Passage

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