State dependence of magnetized fluidized bed reactor on operation mode

Mass transfer intensification between fluidizing gas and Geldart‐B nonmagnetizable particles in magnetized fluidized bed

“…The sizes of the two types of particles were matched to ease the control of their segregation and mixing behaviors. U mf0 was determined as per the method established by Zhu et al 49 The magnetic property of the iron particles could be found in our previous work 13,14 . The specific surface area ( S ) of the alumina particles was measured using ASPA2020 (Micromeritics).…”

“…The experimental setup is shown in Figure 2(A). The four Helmholtz coils were the same as those used in our previous studies 13,14,50 . The distances between them were carefully adjusted as shown in Figure 2(B) to ensure that the generated magnetic field was as much uniform as possible in space.…”

“…For the MFB with purely magnetizable particles, when the magnetization‐FIRST operation mode 11–14 is adopted, the bubble formation could be completely suppressed in the magnetic stabilization flow regime 6,7,15,16 . The MFB in this flow regime is specifically termed the magnetically stabilized bed (MSB) 3 in the literature.…”

“…As far as we know, most previous studies concerning the admixture MFB focused merely on the hydrodynamic aspects, 9 such as the flow regime transition under the magnetization‐FIRST and ‐LAST operation modes, 6,12–14 operating range of the magnetic stabilization flow regime, 40,42–46 structure and formation mechanism of magnetic stabilization, 17,43 extent and mechanism of the bubble size reduction in the magnetized fluidization flow regime, 12 and segregation behavior between the magnetizable and nonmagnetizable particles 12,47 . In contrast, the study on the gas–solid interphase mass transfer in the admixture MFB was quite limited.…”

“…Hence, the combined effects of introducing magnetizable particles and applying the magnetic field on such mass transfer will be explored separately for all these flow regimes. Furthermore, the hydrodynamic state of the admixture MFB was reported to depend not only on the values of H and U g but also on their application sequence (i.e., operation mode) within certain operating ranges 9,12–14 . Hence, the possible difference in the mass transfer intensification between the magnetization‐FIRST and ‐LAST modes will also be explored.…”