Results 201 to 210 of about 322 (244)
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1D model of an active magnetic regenerator
International Journal of Refrigeration, 2014The 1D active magnetic regenerator model developed at the University of Applied Sciences of Western Switzerland is described. The system of two partial differential equations is discretized with the finite differences method backward in time and solved with the tridiagonal matrix algorithm.
P. Nikkola, C. Mahmed, M. Balli, O. Sari
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2014
It is well known that the magnetocaloric effect of most magnetocaloric materials at moderate magnetic fields (up to 1.5 T) is limited to a maximum adiabatic temperature change of 5 K [1, 2]. This value is not sufficient for such materials to be directly implemented into a practical cooling or heating device where temperature span over 30 K are required.
Andrej Kitanovski +5 more
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It is well known that the magnetocaloric effect of most magnetocaloric materials at moderate magnetic fields (up to 1.5 T) is limited to a maximum adiabatic temperature change of 5 K [1, 2]. This value is not sufficient for such materials to be directly implemented into a practical cooling or heating device where temperature span over 30 K are required.
Andrej Kitanovski +5 more
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Demagnetizing effects in active magnetic regenerators
Journal of Magnetism and Magnetic Materials, 2005Abstract Magnetic refrigeration (MR) relies on the ability of a magnetic substance to undergo a significant change in magnetic entropy due to the application or removal of an applied magnetic field. In active magnetic regenerators (AMR) the working material tends to operate near the magnetic ordering temperature, and, because the AMR creates a ...
O. Peksoy, A. Rowe
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Numerical analysis of an active magnetic regenerator
International Journal of Refrigeration, 2011Abstract A one-dimensional transient model of an active magnetic regenerator has been developed. The magnetocaloric properties are calculated using the Mean field theory and the model is used to study the transient and steady state response of a parallel plate regenerator.
Roudaut, Julien +3 more
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Simplified modeling of active magnetic regenerators
International Journal of Refrigeration, 2013A simplified model for predicting the general trends of active magnetic regenerator devices is presented. To reduce computational demands it is assumed the regenerator has sufficiently high convective interaction such that a one-phase regenerator approximation is sufficient. A corrective term is subsequently added to the thermal conductivity to account
Thomas Burdyny, Andrew Rowe
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Modeling of Thermo-Magnetic Phenomena in Active Magnetic Regenerators
Volume 1: Heat Transfer in Energy Systems; Thermophysical Properties; Theory and Fundamental Research in Heat Transfer, 2013The active magnetic regenerator (AMR) is at the heart of the thermo-magnetic Brayton cooling cycle. It consists of a porous matrix heat exchanger whose solid phase is a magnetocaloric material (solid refrigerant) that undergoes a reversible magnetic phase transition when subjected to a changing magnetic field.
Paulo V. Trevizoli +4 more
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Thermodynamics of active magnetic regenerators: Part II
Cryogenics, 2012Abstract Cycle-averaged relationships for heat transfer, magnetic work, and temperature distribution are derived for an active magnetic regenerator cycle. A step-wise cycle is defined and a single equation describing the temperature as a function of time and position is derived. The main assumption is that the convective interaction between fluid and
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Biohybrid Magnetic Microrobots for Tumor Assassination and Active Tissue Regeneration
ACS Applied Bio Materials, 2022Magnetic microrobots have attracted increasing research interest for diverse biomedical applications, such as targeted therapy and tissue regeneration. However, multifunctional microrobots with complex morphology at the microscale are urgently needed to be fabricated, actively controlled, and functionalized.
Dong Liu +6 more
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Magnetic refrigeration: Single and multimaterial active magnetic regenerator experiments
Journal of Applied Physics, 2004An investigation of active magnetic regenerators (AMRs) has been performed near room temperature using helium as a heat transfer fluid and a magnetic field of 2 T. To evaluate the impact of the operating conditions, the performance of two reciprocating 90 g gadolinium packed bed regenerators was mapped as a function of the fluid flux and cycle ...
M.-A. Richard, A. M. Rowe, R. Chahine
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Demagnetizing Effects in Active Magnetic Regenerators
AIP Conference Proceedings, 2004Magnetic Refrigeration (MR) relies on the ability of a magnetic substance to undergo a significant change in entropy due to the application or removal of an applied field. In Active Magnetic Regenerators (AMR) the working material tends to operate near the magnetic ordering temperature, and, because the AMR creates a temperature gradient through the ...
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