The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

Nielsen, Kaspar Kirstein; Bahl, Christian; Engelbrecht, Kurt

doi:10.1088/0022-3727/46/10/105002

Cited by 10 publications

(7 citation statements)

References 24 publications

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“…This problem is that of the well‐known flow through porous or channeled bodies, or in the field of heat exchangers . This important issue was thoroughly investigated by other researchers . One of the last and most interesting studies on the subject was conducted by Navickaite et al, who investigated the possibility of improving the geometry of an active magnetic regenerator using double corrugated tubes.…”

Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

377

156

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The need for energy‐efficient and environmentally friendly refrigeration, heat pumping, air conditioning, and thermal energy harvesting systems is currently more urgent than ever. Magnetocaloric energy conversion is among the best available alternatives for achieving these technological goals and has been the subject of substantial basic and applied research over the last two decades. The subject is strongly interdisciplinary, requiring proper understanding and efficient integration of knowledge in different specialized fields. This review article presents a historical and up‐to‐date account of the energy‐related applications of magnetocaloric materials and information about their processing and magnetic fields, thermodynamics, heat transfer, and other relevant characteristics. The article also discusses the conceptual design of magnetocaloric refrigeration and power generation systems and some guidelines for future research in the field.

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Section: Magnetocaloric Refrigeration and Heat Pumpingmentioning

confidence: 99%

Energy Applications of Magnetocaloric Materials

Kitanovski

2020

Advanced Energy Materials

377

156

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“…In that context, a considerable amount of published research has been solely focusing on fluid dynamics 103,112,113 . One important example is the effect of flow maldistribution in parallel‐plate regenerators 114,115 . The influence of the number of transfer units and Nusselt number was also investigated for MC devices 116,117 …”

Section: Thermodynamic Modelingmentioning

confidence: 99%

“…In the second approach, only one heat equation is considered for the fluid and one for the regenerator. In this case, the used Nusselt number in the heat transfer coefficient is the product of the Nusselt number for a parallel plate and the scaling Nusselt number for the variability of the spacing between plates 114,155 :

italicNu = {Nu}_{pp} {Nu}_{sca} .

…”

Section: Thermodynamic Modelingmentioning

confidence: 99%

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Caloric devices: A review on numerical modeling and optimization strategies

2021

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Summary The discovery of giant caloric effects and further investigation on device systems that can compete with current heat management technologies in terms of efficiency have led to a major increase in modeling investigations. These models have been crucial in designing the most efficient, cheap, and robust setups with reliable performances. One example is the modeling of magnetic refrigerators and heat pumps that has been used in the optimization of critical geometrical parameters of magnetocaloric regenerators. In this paper, we review the model components of caloric heat pump and refrigerator systems, including field generation, heat transfer, caloric effects, fluid dynamics, and loss mechanisms. We also review the optimization strategies used so far, which are based on sensitive analysis, brute force approaches, statistical learning, and genetic algorithms. The analysis is applied to magnetocaloric, electrocaloric, elastocaloric, and barocaloric systems.

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“…The flatness of the plates is very important as it is desired to stack the plates as close as possible. A thickness variation of <5–10% of the average tape thickness is desirable to avoid maldistribution of the flow . To extend the temperature span of the MR device, a graded material with varying T C along the length is also needed (for details, see ).…”

Section: Introductionmentioning

confidence: 99%

Functionally Graded Ceramics Fabricated with Side‐by‐Side Tape Casting for Use in Magnetic Refrigeration

Bulatova

Bahl

Andersen

et al. 2014

Int J Applied Ceramic Tech

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Functionally graded ceramic tapes have been fabricated by a side‐by‐side tape casting technique. This study shows the possibility and describes the main principles of adjacent coflow of slurries resulting in formation of thin plates of graded ceramic material. Results showed that the small variations of solvent and binder system concentrations have a substantial effect on slurry viscosity. Varying these parameters showed that side‐by‐side tape casting with a well‐defined interface area is possible for slurries with viscosities above 3500 mPa s at a casting shear rate of 3.3 s−1. As it was expected, the choice of de‐bindering and sintering regimes significantly influences crack formation, and a three‐step heating programme was found to result in tapes of the highest quality. The interface regions of green graded tapes were investigated structurally by scanning electron microscopy; for a distinct identification of the interface region and analysing the degree of cross‐interface diffusion, the isothermal entropy change was measured by a vibrating sample magnetometer as the magnetic transition temperature (Curie temperature) is very sensitive to the dopant level in ceramics. Also the purpose of developing this graded ceramic tape casting was applications of these specific magnetocaloric properties within the magnetic refrigeration technology.

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The effect of flow maldistribution in heterogeneous parallel-plate active magnetic regenerators

Cited by 10 publications

References 24 publications

Energy Applications of Magnetocaloric Materials

Energy Applications of Magnetocaloric Materials

Caloric devices: A review on numerical modeling and optimization strategies

Functionally Graded Ceramics Fabricated with Side‐by‐Side Tape Casting for Use in Magnetic Refrigeration

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