Abstract
The paper provides detailed information involved in the numerical simulation of transesterification of waste vegetable oil (WVO). The main objective of this work is to perform mixing study based on large eddy simulation particle image Velocimetry (LES-PIV) which resolved the turbulent scale. Reynolds stress model (RSM) was subsequently used to validate the result using a multiple reference frame (MRF) approach for the impeller-vessel geometry. Experimental FAME yield and liquid velocities were found to be dependent on stirrer speeds, impeller bottom distance and bulk flow pattern. Thermodynamic properties of the reaction components were incorporated as user defined function (UDF) for the mixing models. FAME yield were predicted in terms of species concentration and compared fairly well with experimental condition for 1 and 2-L STR, where yield from the numerical model varied by about 18 and 23 % for 1 and 2-L STR respectively. The characteristic time scales were used to show the relevant mixing scale to describe the process.
Highlights
The main objective of this paper is to use computational fluid dynamics (CFD) modeling approach to integrate reaction measurements and computational modeling in a multi-scale framework
The CFD model of the WCO transesterification is proposed to be used in the development process condition with few experimental data regarding transesterification of waste vegetable oil (WVO)
This was done in triplicates and the average Free Fatty Acid (FFA) was calculated by Eq (1)
Summary
The main objective of this paper is to use computational fluid dynamics (CFD) modeling approach to integrate reaction measurements and computational modeling in a multi-scale framework. The production of biodiesel in STR takes place in the turbulent range. Literatures on biodiesel production mostly report radial impellers to achieve mixing during oil transesterification [1]. At a stoichiometric molar ratio of 3:1 (alcohol to oil), the conversion of oil to biodiesel takes place in the presence of a homogenous catalyst where the reaction is understood to be either the formation of two intermediates before forming the final product [2] or the formation of only one intermediate subsequent to formation of the final product [3]. Different mixing impellers produce certain different effects in multi-component reactions [5]. Where it is necessary to promote yield of a single component without unnecessary side products, mixing velocities is selected to produce the right mixing-scale and a mass transfer rate
Sign-in/Register to view highlights & summary Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
