Tiefeng Wang

Tsinghua University

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A unified theoretical model for breakup of bubbles and droplets in turbulent flows

AIChE Journal (2014)

Chutian Xing Tiefeng Wang Kunyu Guo Jinfu Wang

Pressure has a significant effect on bubble breakup, and bubbles and droplets have very different breakup behaviors. This work aimed to propose a unified breakup model for both bubbles and droplets including the effect of pressure. A mechanism analysis was made on the internal flow through the bubble/droplet neck in the breakup process, and a mathematical model was obtained based on the Young–Laplace and Bernoulli equations. The internal flow behavior strongly depended on the pressure or gas density, and based on this mechanism, a unified breakup model was proposed for both bubbles and droplets. For the first time, this unified breakup model gave good predictions of both the effect of pressure or gas density on the bubble breakup rate and the different daughter size distributions of bubbles and droplets. The effect of the mother bubble/droplet diameter, turbulent energy dissipation rate and surface tension on the breakup rate, and daughter bubble/droplet size distribution was discussed. This bubble breakup model can be further used in a population balance model (PBM) to study the effect of pressure on the bubble size distribution and in a computational fluid dynamics‐population balance model (CFD‐PBM) coupled model to study the hydrodynamic behaviors of a bubble column at elevated pressures. © 2014 American Institute of Chemical Engineers AIChE J , 61: 1391–1403, 2015

Laplace pressure

Population balance equation

10.1002/aic.14709

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Citations (76)

Catalytic Activity of Low-loading Pd and Pt Supported Catalysts for Combustion of Dimethyl Ether

Guocheng gongcheng xuebao (2011)

Tiefeng Wang

In order to select desirable catalysts for combustion of dimethyl ether (DME),a series of low-loading Pd and Pt catalysts were prepared by impregnation on-Al2O3.The effects of loading amount and sequence of the metals on catalytic performance were investigated,and the effect of loading molar ratio of the metals.Using 0.025%(ω) Pt-loaded catalyst,DME was completely converted to CO2 and H2O at 190℃.The catalyst with Pd and Pt loaded together [Pd:Pt=2:1(mol),Pt 0.025%(ω),Pd 0.027%(ω),Pt first-loaded] had better performance,by which DME was completely converted at 175℃.Catalytic activity of these two catalysts was decreased by less than 5% after 200 h reaction.

Dimethyl ether

Molar ratio

Catalytic combustion

Source

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Citations (0)

A modified pseudopotential for a lattice Boltzmann simulation of bubbly flow

Chemical Engineering Science (2010)

Malin Liu Yu Zhao Tiefeng Wang Jinfu Wang Liang‐Shih Fan

Pseudopotential

Lattice Boltzmann methods

Spurious relationship

Multiphase flow

10.1016/j.ces.2010.08.014

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Citations (35)

Isophthalonitrile (IPN) hydrogenation over K modified Ni–Co supported catalysts: catalyst characterization and performance evaluation

RSC Advances (2014)

Chang Liu Tiefeng Wang

K modification suppressed both the original and the newly formed acid sites on the NiCo/Al₂O₃ catalyst, which were responsible for the condensation reactions in the IPN hydrogenation network.

Characterization

10.1039/c4ra09607j

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Citations (10)

Intensification of diethyl methylphosphite synthesis based on kinetics study and CFD modeling

AIChE Journal (2023)

Banghao Li Xiaocheng Lan Tiefeng Wang

Abstract A “pre‐dissolving ammonia” intensification method for continuous production of diethyl methylphosphite (DEMP) was proposed based on kinetics study of methyl dichlorophosphine (MDP) substitution and DEMP acidolysis. The method was verified in a continuous synthesis system consisting of a small jet reactor. Compared with the selectivity of ~80% obtained in a stirred flask, the selectivity reached 98% by the intensification method. Eliminating the resistance of gas–liquid mass transfer and enhancement of mixing enabled rapid removal of the produced HCl, thus, the DEMP selectivity was greatly increased. The high DEMP selectivity obtained was insensitive to reaction temperature, reactor size and ammonia to chlorine ratio in the studied range. A computational fluid dynamics (CFD) model was proposed for this liquid turbulent reactive flow. Numerical simulations revealed that HCl could be removed rapidly by the neutralization reaction, which was limited by micromixing efficiency. The CFD simulation further indicates the feasibility of “pre‐dissolving ammonia” for industrial production.

Micromixing

10.1002/aic.18264

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Citations (2)

Combining Ni3P and Lewis Acid–Base Pair as a High-Performance Catalyst for Amination of 1-Octanol

Catalysis Letters (2022)

Shi‐Qing Wang Yafei Li Xiaocheng Lan Boyang Liu Tiefeng Wang

Organometallic Chemistry

Base (topology)

Octanol

Weak base

10.1007/s10562-022-04035-x

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Citations (3)

Experimental study on gas–liquid interfacial area and mass transfer coefficient in three-phase circulating fluidized beds

Chemical Engineering Journal (2001)

Yang Wei-guo Jinfu Wang Tiefeng Wang Yong Jin

Mass transfer coefficient

Fluidized bed combustion

Fluidization

10.1016/s1385-8947(00)00374-0

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Citations (39)

The solution of shear stress discontinuity in film drainage model

Chemical Engineering Science (2021)

Yuelin Wang Huahai Zhang Tiefeng Wang

Discontinuity (linguistics)

10.1016/j.ces.2021.117362

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Citations (5)

Synthesis of a Green Fuel Additive Over Cation Resins

Chemical Engineering & Technology (2013)

Yanyan Zheng Qiang Tang Tiefeng Wang Yuxuan Liao Jian-Bo WANG

Abstract The synthesis of polyoxymethylene dimethyl ethers (PODE n ), being green diesel fuel additives, from dimethoxymethane (DMM) and paraformaldehyde over three different cation resins, namely NKC‐9, D001‐CC, and D72, in a stirred‐autoclave reactor was investigated. The pore size distribution and surface area were measured with nitrogen adsorption‐desorption. NKC‐9 had a larger exchange capacity, better developed porosity structure, and higher reaction activity than D001‐CC and D72. The effects of reaction temperature, DMM/CH 2 O molar ratio, reaction time, and catalyst loading were studied with NKC‐9. A possible mechanism was explored to describe the bond reorganizations during the reactions.

Dimethoxymethane

Autoclave

Ion-exchange resin

10.1002/ceat.201300360

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Citations (137)

MULTIPHASE FLOW REACTORS FOR METHANOL AND DIMETHYL ETHER PRODUCTION

Tiefeng Wang Jinfu Wang

Demand for methanol is growing rapidly not only as feedstock for chemicals but also as fuel for blending with gasoline, as feedstock for methanol-to-olefin (MTO) and methanol-to-aromatics (MTA) plants and as feedstock for dimethyl ether (DME) used as fuel. The process of methanol synthesis comprises three steps: production of syngas, conversion of syngas to methanol, and distillation of the product mixture to meet the required product specification. The catalytic production of methanol from syngas was first developed by BASF. The slurry reactor presents the advanced reactor technology for gas-to-liquid processes, such as Fischer-Tropsch synthesis, methanol synthesis, and DME synthesis. Its advantages include simple construction, excellent heat transfer performance, online catalyst addition and withdrawal, and reasonable interphase mass transfer rates with low energy input. However, its multiphase flow behaviors are very complex and the multiphase reactor has some remarkable scale-up effects.

Dimethyl ether

10.1002/9781119251101.ch6

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Citations (1)