Author
Zheng Zou
Bio: Zheng Zou is an academic researcher from Chinese Academy of Sciences. The author has contributed to research in topics: Fluidized bed & Fluidization. The author has an hindex of 10, co-authored 28 publications receiving 241 citations.
Papers
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TL;DR: In this article, a new drag model for TFM simulation in gas-solid bubbling fluidized beds was proposed, and a set of equations was derived to determine the meso-scale structural parameters to calculate the drag characteristics of Geldart-B particles under low gas velocities.
47 citations
TL;DR: In this paper, magnetic Fe 3 O 4 particles were prepared from copper/iron ore cider by precipitation oxidization method and the yield of Fe was 82.6 at% XRD, TEM, SEM, EDS and microwave network analyzer were used to characterize the particles.
42 citations
TL;DR: In this paper, the simulation of bubbling fluidized beds (BFB) residence time distribution (RTD) based on the structure-based drag model is conducted for the single and binary gas-solid phases systems, a comparison of computed results with experimental data proves that their model is applicable to both systems with better accuracy.
22 citations
TL;DR: Lu et al. as discussed by the authors extended the EMMS-DPM method to simulate the residence time distribution of polydisperse particles in a continuously operated multiple-chamber fluidized bed with a calculation of physical time of up to one hour.
22 citations
TL;DR: In this article, the authors provide a deeply analysis of the flow behavior of bubbling fluidized beds with fine particles in two-and three-dimensional (3D) conditions, and computational fluid dynamics (CFD) simulations of agglomerates fluidization are carried out coupled with the modified agglerate-force balance model.
Abstract: The present study provides a deeply analysis of the flow behavior of bubbling fluidized beds with fine particles in two- (2D) and three-dimensional (3D) conditions, and computational fluid dynamics (CFD) simulations of agglomerates fluidization are carried out coupled with the modified agglomerate-force balance model, correspondingly. The experimental results indicate that the fluidized bed can be divided into bottom unfluidized, middle ascending fluidized, and upper descending back-mixing sections. The local solids volume fraction value ranges from 0.11 to 0.30, which depends on the interaction between bubble phase (es = 0–0.04) and emulsion phase (es = 0.26–0.30). The wall effect appears to be weakened, and the cohesive particles fluidize more uniformly in 3D fluidized beds. The simulations are in reasonable agreement with the experimental findings. However, at the top region of the bed the predicted solids holdup slightly deviates from experimental measurement. The vector plots of computed agglomerates...
20 citations
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TL;DR: A comprehensive review on the recent research progress of nanomaterials for microwave absorption, including the basic mechanism of microwave absorption (e.g., dielectric loss, magnetic loss coupling), measurement principle, fundamental analysis, performance evaluation, common interaction pathways: Debye relaxation, Eddy current loss, natural resonance, size and shape factors), and the advances and performance review in microwave absorption using various nanommaterials, such as carbon nanotubes, carbon fibers, graphenes, oxides, sulfides, phosphides, carbides, polymers and metal organic
308 citations
TL;DR: Graphene (G)-Fe3O4 nanohybrids were fabricated by first depositing β-FeOOH crystals with diameter of 3-5nm on the surface of the graphene sheets as mentioned in this paper.
Abstract: Graphene (G)–Fe3O4 nanohybrids were fabricated by first depositing β-FeOOH crystals with diameter of 3–5 nm on the surface of the graphene sheets. After annealing under Ar flow, β-FeOOH nanocrystals were reduced to Fe3O4 nanoparticles by the graphene sheets, and thus G–Fe3O4 nanohybrids were obtained. The Fe3O4 nanoparticles with a diameter of about 25 nm were uniformly dispersed over the surface of the graphene sheets. Moreover, compared with other magnetic materials and the graphene, the nanohybrids exhibited significantly increased electromagnetic absorption properties owing to high surface areas, interfacial polarizations, and good separation of magnetic nanoparticles. The maximum reflection loss was up to −40.36 dB for G–Fe3O4 nanohybrids with a thickness of 5.0 mm. The nanohybrids are very promising for lightweight and strong electromagnetic attenuation materials.
225 citations
TL;DR: In this paper, the Navier-Stokes order continuum theory is used for CFD simulation of the hydrodynamics of gas-solid fluidization, without taking the effects of heat and mass transfer as well as chemical reactions into consideration.
179 citations
TL;DR: In this article, a brief presentation of ferrites and among them are spinel ferrite and hexagonal ferrite is presented, and the main mechanism to absorb the microwaves (e.g. dielectric and magnetic losses) and finally discusses the microwave absorbing characteristics of ferites and their composites in terms of matching frequency, reflection loss values, and absorption bandwidth.
155 citations
TL;DR: In this paper, the authors examined the contributing effects of various parameters such as Fe 3 O 4 content, carbonization temperature and thickness on total shielding efficiency (SE total ) of different samples.
155 citations