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Characteristics of pressure with respect to heterogeneous flow structure in fluidized beds
Alternative TitleJ. Chem. Eng. Jpn.
Xu, GW; Nomura, K; Bai, YR; Sun, GG; Nakagawa, N; Li, JH; Kato, K
1998-04-01
Source PublicationJOURNAL OF CHEMICAL ENGINEERING OF JAPAN
ISSN0021-9592
Volume31Issue:2Pages:236-243
AbstractThe characteristics of pressure in gas/solids fluidization is measured with respect to the heterogeneous structure typified as lateral core/annulus segregation and local two-phase coexistence. Experiments are carried out in two circulating fluidized bed risers with bed diameters of 0.09 m and 0.15 m, respectively. Particles FCC (Geldart A) and silica sand (Geldart B) are used in the experiment, and are fluidized by air. It is found that the dynamic changes of the particle-rich dense phase (clusters or emulsion) and the fluid-rich dilute phase (broth or bubbles), as well as the alternations between these two distinct phases, can create a serious imbalance of instantaneous pressures among different radial locations at a same bed height. However, only a subtle time-mean pressure difference can be detected between the bed wall and the bed center with the higher pressure residing on the bed wall. It is observed that this wall-to-axis pressure difference is less than 30 Pa in a typical fast fluidized bed, while it reaches at most about 150 Pa for usual bubbling fluidization, The intra-phase pressures in both the dense phase and the dilute phase are also demonstrated to be subject to a dynamic variation other than a particular relation.; The characteristics of pressure in gas/solids fluidization is measured with respect to the heterogeneous structure typified as lateral core/annulus segregation and local two-phase coexistence. Experiments are carried out in two circulating fluidized bed risers with bed diameters of 0.09 m and 0.15 m, respectively. Particles FCC (Geldart A) and silica sand (Geldart B) are used in the experiment, and are fluidized by air. It is found that the dynamic changes of the particle-rich dense phase (clusters or emulsion) and the fluid-rich dilute phase (broth or bubbles), as well as the alternations between these two distinct phases, can create a serious imbalance of instantaneous pressures among different radial locations at a same bed height. However, only a subtle time-mean pressure difference can be detected between the bed wall and the bed center with the higher pressure residing on the bed wall. It is observed that this wall-to-axis pressure difference is less than 30 Pa in a typical fast fluidized bed, while it reaches at most about 150 Pa for usual bubbling fluidization, The intra-phase pressures in both the dense phase and the dilute phase are also demonstrated to be subject to a dynamic variation other than a particular relation.
KeywordPressure Heterogeneous Flow Structure Fluidized Bed Hydrodynamics Lateral Movements
SubtypeArticle
WOS HeadingsScience & Technology ; Technology
URL查看原文
Indexed BySCI
Language英语
WOS KeywordREGIMES ; MODEL
WOS Research AreaEngineering
WOS SubjectEngineering, Chemical
WOS IDWOS:000073735000010
Citation statistics
Cited Times:9[WOS]   [WOS Record]     [Related Records in WOS]
Document Type期刊论文
Version出版稿
Identifierhttp://ir.ipe.ac.cn/handle/122111/5874
Collection研究所(批量导入)
Affiliation1.Gunma Univ, Dept Biol & Chem Engn, Kiryu, Gumma 376, Japan
2.Acad Sinica, Inst Chem Met, Beijing 100080, Peoples R China
Recommended Citation
GB/T 7714
Xu, GW,Nomura, K,Bai, YR,et al. Characteristics of pressure with respect to heterogeneous flow structure in fluidized beds[J]. JOURNAL OF CHEMICAL ENGINEERING OF JAPAN,1998,31(2):236-243.
APA Xu, GW.,Nomura, K.,Bai, YR.,Sun, GG.,Nakagawa, N.,...&Kato, K.(1998).Characteristics of pressure with respect to heterogeneous flow structure in fluidized beds.JOURNAL OF CHEMICAL ENGINEERING OF JAPAN,31(2),236-243.
MLA Xu, GW,et al."Characteristics of pressure with respect to heterogeneous flow structure in fluidized beds".JOURNAL OF CHEMICAL ENGINEERING OF JAPAN 31.2(1998):236-243.
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