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Numerical study of micromixing combining alternate flow and obstacles
Miranda, J. M.; Oliveira, Hugo; Teixeira, J. A.; Vicente, A. A.; Correia, J. H.; Minas, GraçaMixing in microsystems, combining alternate flow with obstacles, is studied by numerical methods. Simulations show that the layers of high and low solute concentrations, created by the alternate flow, are split into smaller chunks of fluid by obstacles inserted in the mixing channel, decreasing the critical mixing length. Reverse flow is necessary to guarantee symmetry and good mixing. Mixing increases with the...
Primeiro relato de Muscidifurax raptorellus Kogan & Legner, 1970 (Hymenopte...
Marchiori,C.H.; Miranda,J.M.; Costa,V.A.This study reports the first occurrence of Muscidifurax raptorellus (Hymenoptera: Pteromalidae) in Brazil. Chicken manure samples, collected at two-week interval, were taken to the laboratory and the pupae were extracted by the method of flotation. Each pupa was placed in capsules of colorless gelatin until the emergence of dipterous or their parasitoids. In the study, ten pupae of Fannia pusio (Wiedemann, 1830...
Design of a lab-on-a-chip for clinical tests of human physiological fluids
Miranda, J. M.; Minas, Graça; Vicente, A. A.; Teixeira, J. A.Labs-on-a-chip are useful to perform in situ clinical tests with instantaneous results. In this work, the design phase of the development of a lab-on-a-chip is presented. The device will be used to perform tests on physiological fluids. It will be able to test 8 components: calcium, chloride, creatinine, glucose, magnesium, total protein, urea and uric acid. A sample of the physiological fluid reacts with sever...
Oscillatory and alternate flows in a microfluidic device
Oliveira, Hugo Carneiro; Miranda, J. M.; Teixeira, J. A.; Vicente, A. A.; Correia, J. H.; Minas, GraçaThe mixing properties of systems with oscillatory or alternate flows are studied by numerical methods. Preliminary results show that, for alternate flows, the contact area between high and low concentration regions increases and mixing is achieved from the combination of transversal diffusion and axial advection. The improvement in the mixing process shows that this method is very useful for designing mixers in...
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