4 documents found, page 1 of 1
Numerical study of active mixing over a dynamic flow field in a T-jets mixer-In...
Ertugrul Erkoç; Cláudio P. Fonte; Madalena M. Dias; José Carlos B. Lopes; Ricardo J. SantosThe flow field in a 2D T-jets mixer was simulated to study the effect of the pulsation/modulation of the jets flow rate on the dynamics of mixing. Different strategies, frequencies and amplitudes of the opposed jets flow rate modulation were tested. The modulation frequencies were set as multiples of the natural oscillation frequencies of the dynamics flow field. The natural flow frequencies are determined from...
Real time control of mixing in Reaction Injection Moulding
Nuno M. O. Gomes; Cláudio P. Fonte; Carlos Costa e Sousa; Artur J. Mateus; Paulo J. Bártolo; Madalena M. Dias; José Carlos B. Lopes; Ricardo J. SantosReaction Injection Moulding, RIM, is a technology for the production of plastic parts using reactive in situ polymerization from the mixing of two or more liquid monomers. Although RIM is a widely used process, nowadays there are no means to effectively control mixing. This work assesses a new control variable of mixing in RIM: the differential static pressure between the liquid monomers injectors. This control...
Flow imbalance and Reynolds number impact on mixing in Confined Impinging Jets
Cláudio P. Fonte; M. Ashar Sultan; Ricardo J. Santos; Madalena M. Dias; Jose Carlos B. LopesThe flow in a Confined Impinging Jets (CIJs) mixer was studied with Planar Laser Induced Fluorescence. Two key aspects influencing the flow regimes and mixing quality were studied: the impact of the jets' Reynolds number (Re) in the range 50 < Re < 600; and the effect of the jets' flow imbalance, maintaining the flow rate of one of the injectors fixed and varying the other. Mixing mechanisms and scales are stud...
Prediction of the Induced Gas Flow Rate from a Self- Inducing Impeller with CFD
Cláudio P. Fonte; Bruno S. Pinho; Vania Santos Moreau; José Carlos B. LopesThe complex task of describing computationally two-phase turbulent flows in aerated stirred-tank reactors was overcome by proposing that the gas flow rate in the hollow impeller can be estimated from single-phase flow simulations of the liquid phase in the reactor: the pressure at the impeller surface obtained from liquid phase simulations can be related to the gas induction rate. A commercial lab-scale reactor...