Churn-turbulent bubble columns
- 出版日期：2002.
- 页数：357 p. :
- 第一责任说明：Puneet Gupta.
- 分类号：a141.4
- ISBN：0493842284(ebk.) :
MARC全文
02h0026014 20111122111554.0 cr un||||||||| 111122s2002 xx ||||f|||d||||||||eng | AAI3065044 0493842284(ebk.) : CNY371.35 NGL NGL NGL a141.4 Gupta, Puneet. Churn-turbulent bubble columns [electronic resource] : experiments and modeling/ Puneet Gupta. 2002. 357 p. : digital, PDF file. Source: Dissertation Abstracts International, Volume: 63-09, Section: B, page: 4269. ; Directors: M. P. Dudukovic'; M. H. Al-Dahhan. Thesis (Ph.D.)--Washington University, 2002. Includes bibliographical references. A fundamental understanding of hydrodynamics is critical to the design and scale-up of bubble column reactors. Towards this goal, systematic experimental and theoretical investigations were conducted to improve the diagnostic tools for assessing bubble column hydrodynamics. The first experimental contribution of this study concerns the development of a novel signal-filtration technique to obtain liquid-phase tracer responses from conductance measurements in gas-liquid flows, which are systematically corrupted due to frequent bubble passage over the probe measurement volume. The usefulness of the developed algorithm was demonstrated in a countercurrent trayed bubble column and extended to study liquid tracer responses in a batch bubble column. The second contribution pertains to the development of a Monte Carlo simulation technique for efficient non-invasive tracking of a radioactive tracer particle. The developed simulation tool was integrated for simulating detector responses in a multi-detector setup and used to study the effect of media-density distribution on detector efficiencies. The developed technique was further validated against experimental data and applied to a gas-liquid flow in a stainless steel bubble column. Lastly, protocols were developed for executing radioactive tracer tests and gamma-scans on pilot-scale bubble columns and data interpretation.;The second part of this study deals with developing a consistent hydrodynamic formulation based on the Euler-Euler two-fluid approach for modeling gas-liquid flows in bubble column reactors. The predicted phase recirculations were subsequently coupled with species transport equations for a gas tracer based on two competing models. The first assumes that the gas-phase hydrodynamics is represented by a single bubble size, whereas the second assumes a radially varying bubble size. The models were applied for interpretation of radioactive tracer data from a pilot-scale reactor used for methanol synthesis. The first model was extended to interpret gas, liquid and catalyst tracer test data acquired in another pilot-scale reactor used for Fischer-Tropsch synthesis. The predicted phase mixing is presented for a number of operating conditions along with comparison to experimental data. It is concluded that when the regime of bubble column operation is churn-turbulent and substantially removed from the transition regime, the model predictions are in reasonably good agreement with experimental data. Hydrodynamics. Electronic books. aeBook. aCN bNGL http://proquest.calis.edu.cn/umi/detail_usmark.jsp?searchword=pub_number%3DAAI3065044&singlesearch=no&channelid=%CF%B8%C0%C0&record=1 NGL Bs1057 rCNY371.35 ; h1 bs1108