Browsing by Author "12763764 - Branken, David Jacobus"
Now showing items 1-11 of 11
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CFD modeling of particle charging and collection in electrostatic precipitators
Arif, S.; Branken, D.J.; Everson, R.C.; Neomagus, H.W.J.P.; Le Grange, L.A.; Arif, A. (Elsevier, 2016)A CFD model was developed to describe the particle laden gas flow through an ESP, particle charging and collection. The corona discharge was modeled using the open source software OpenFOAM to solve the Poison and charge ... -
CFD simulation of an industrial wet flue gas desulfurization spray tower: a comprehensive model with special atttention devoted to the modeling of absorption and chemical reactions
Everson, Raymond; Arif, A.; Neomagus, H.; Branken, D. (International Pittsburgh Coal Conference, 2016) -
A density-functional theory approach to the separation of K2ZrF6 and K2HfF6 via fractional crystallization
Branken, D.J.; Lachmann, G.; Krieg, H.M.; Bruinsma, O.S.L. (Wiley, 2011)Because of the low absorption cross-section for thermal neutrons of zirconium (Zr) as opposed to hafnium (Hf), Zr-metal must essentially be Hf-free (<100 ppm Hf) to be suitable for use in nuclear reactors. However, Zr and ... -
Development of an integrated model for absorption of sulphur dioxide in limestone slurry
Mchabe, D.; Everson, R.C.; Ramachandran, P.A.; Neomagus, H.W.J.P.; Branken, D.J. (Elsevier, 2021)The aim of this study is to develop an integrated model for SO2 absorption into limestone slurry consisting of four sub-models, namely, absorption of SO2; desorption of CO2; dissolution of limestone and crystallization of ... -
A dual-channel gas chromatography method for the quantitation of low and high concentrations of NF3 and CF4 to study membrane separation of the two compounds
Branken, D.J.; Le Roux, J.P.; Krieg, H.M.; Lachmann, G. (Elsevier, 2013)A dual-channel gas chromatographic method is described in this paper that can be conveniently used for quantitation of NF3/CF4 mixtures with a thermal conductivity detector (TCD) on one channel for the quantitation of ... -
The influence of design parameters on the occurrence of shielding in multi-electrode ESPs and its effect on performance
Arif, S.; Branken, D.J.; Everson, R.C.; Neomagus, H.W.J.P.; Arif, A. (Elsevier, 2018)A numerical model in which OpenFOAM® is used to model the electrostatic field resulting from corona discharge in single-channel wire-plate electrostatic precipitators (ESPs) was applied to systematically study the shielding ... -
Influence of KF and HF on the selectivity of Zr and Hf separation by fractional crystallization of K2Zr(Hf)F6
Branken, Dawie J.; Lachmann, Gerhard; Krieg, Henning M.; Bruinsma, Dolf S.L. (ACS, 2010)For nuclear applications, zirconium metal (Zr) must adhere to stringent specifications, where a low hafnium (Hf) content, i.e., <100 ppm, is one of the most important requirements due to the opposing nuclear characteristics ... -
Influence of maceral composition on the structure, properties and behaviour of chars derived from South African coals
Roberts, Mokone J.; Everson, Raymond C.; Neomagus, Hein W.J.P.; Branken, David J.; Van Niekerk, Daniel (Elsevier, 2015)The generation of coal chars is an important intermediate step in coal conversion processes such as combustion and gasification. The char structure impacts their behaviour in these processes. Detailed investigations on ... -
Modelling sorption and diffusion of NF3 and CF4 in Teflon AF perfluoropolymer membranes
Branken, D.J.; Krieg, H.M.; Lachmann, G.; Carstens, P.A.B. (Elsevier, 2014)Molecular dynamics (MD) and grand canonical Monte Carlo (GCMC) simulations with Teflon AF2400 and Teflon AF1600 predicted diffusivities and solubilities of He and N2 that corresponded reasonably with available experimental ... -
Separation of NF3 and CF4 using amorphous glassy perfluoropolymer Teflon AF and Hyflon AD60 membranes
Branken, D.J.; Krieg, H.M.; Lachmann, G.; Le Roux, J.P. (Elsevier, 2014)In this study, the pure and mixed gas permeabilities of Teflon AF2400, Teflon AF1600 and Hyflon AD60 membranes towards NF3 and CF4 were measured to determine whether membrane gas separation can be applied to purify NF3 of ... -
Transport properties of chitosan membranes for zinc (II) removal from aqueous systems
Osifo, Peter O.; Neomagus, Hein W.J.P.; Branken, David J.; Van der Merwe, Hein (Elsevier, 2017)Chitosan materials that were prepared from different sources of fishery waste were subsequently characterized and the influence of molecular weight (Mw) and degree of deacetylation (DDA) on the chitosan-acetic acid solution ...