Abstract
In this paper, the magnetic properties and heat transfer performance of Fe99.3-xNixMn0.4Si0.3 (x=33, 35, 37, 39, 41, 43) alloys near the Curie temperature (TC) were investigated. The results show that Curie temperature TC for the Fe99.3-xNixMn0.4Si0.3 alloys increases almost linearly from 450 K to 647 K with the Ni content increasing from x = 33 to x = 43. The maximum change rate of the magnetic induction (ΔB/ΔT) near the Curie temperature first increases and then decreases with the increasing Ni content. The maximum ΔB/ΔT value for Fe99.3-xNixMn0.4Si0.3 (x≥37) alloys is higher than that of the second-order phase transition materials (0.0202 T/K). Therefore, the Fe100-xNixMn0.4Si0.3 alloys are suitable for thermomagnetic power generation above 473 K. The energy conversion process of a platy sample (0.2×0.2×0.001 m3) for the alloy with x=37 in the static thermomagnetic power generation was simulated, and the maximum electromotive force of 1.47 V was generated in the simulation.
Highlights
Low-grade waste heat is difficult to utilize effectively because of the small temperature difference of hot and cold sinks
It has been found that several magnetic alloys can be employed to recycle the low-grade heat. Those alloys exhibit abrupt and large magnetization changes (∆M) in a narrow temperature range (∆T) near the magnetic transition, which opens a new field for the effective utilization of low-grade waste heat
The second-order phase transition material Ni-Mn-Ga was studied by Gueltig et al.,11 Zhang et al.,12 which has an abrupt drop of the magnetization M at the Curie temperature TC
Summary
Low-grade waste heat is difficult to utilize effectively because of the small temperature difference of hot and cold sinks. As one of the second-order phase transition materials, FeNibased alloys have the advantages of tunable Curie temperature TC, high magnetic permeability and good processability. The low optimal magnetic field make those alloys outperform other reported materials on thermomagnetic power generation.. The values of (∆B/∆T)max for Fe99.3−xNixMn0.4Si0.3 (x≥37) alloys are higher than those of the reported second-order phase transition materials (0.0202 T/K).. The large thermal conductivity of the alloys indicates their good heat transfer property, which is beneficial to heat transfer and thermomagnetic power generation
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
