Isothermal Air Flow Investigation in Industrial Baking Oven of Different Impeller Locations using Computational Fluid Dynamics (CFD) Approach

Computational fluid dynamics (CFD) modelling was performed on a forced convection oven to investigate the isothermal airflow. Three oven design configurations based on their impeller location (back, side, and top wall) were compared with respect to their Turbulence Kinetic Energy (TKE) profile to determine the optimal configuration design for quick uniform baking. The air velocity was estimated from both experimental and modelling approaches at specific points in an oven with the back walled impeller. The CFD model was validated resulting in a calculation error of 30.34% of actual velocity which was mainly due to limitation in grid density and the turbulence modelling. The other two oven configurations were simulated and their average TKE data were extracted and compared. The third configuration (impeller at the top wall) was found to have the highest average TKE of 3.55 m2/s2 followed by the first configuration (impeller at the back wall) with 3.30 m2/s2 which provides a relatively uniform TKE distribution across the cavity. The findings show the significance of impeller placement in oven performance.

Preface

The conference “Optical Methods of Flow Investigation” (OMFI) has been regularly held since 1989 at intervals of 2 years. The All-Union Seminar was held in 1989, I and II All-Union Conferences (founder – Institute of Thermal Physics of the Siberian Branch of the Russian Academy of Sciences) was held in 1991 and 1993. Since 1995, conferences have been held at the Moscow Power Engineering Institute (MPEI) under the auspices of the Siberian Branch of the Russian Academy of Sciences and the Ministry of Education of the Russian Federation, the co-founders were MPEI and the Institute of Thermophysics of the Siberian Branch of the Russian Academy of Sciences. Since 2019 Scientific and Technological Center of Unique Instrumentation of the Russian Academy of Sciences has also become a co-organizer of the conference. This issue of the Journal is devoted to research and studies presented at the XVI International Scientific and Technical Conference “Optical Methods of Flow Investigation” (OMFI-2021). The conference was held in Moscow Power Engineering Institute, Moscow, Russia, on 28 June – 02 July 2021. The National Research University “Moscow Power Engineering Institute” is one of the leading technical universities in Russia having about 15,000 students from more than 60 countries. MPEI is one of the largest technical universities in Russia. It provides the specialist’s training and scientific research in the field of energy, electrical engineering, radio electronics, computer engineering. The conference brought together experts from different organizations to initiate discussions on topics that are of interest to the conference attendees. The conference papers presented in the following areas: laser anemometry, flow visualization, development of quantum-optical devices, computer methods of signal and image processing, laser and optical interferometry, application of optical methods, acousto-optics and optoacoustic, optical methods in biomedicine and ecology, also included papers of the Youth workshop «Modern Methods of Flow Investigation – 2021». List of Organizing and program committees of the conference are available in this pdf.

Pressure and velocity measurements of air flow past a proposed generic Aircraft carrier geometry

Research on the air flow disturbances in the aircraft carrier environment has gained prominence in recent times. However, there is presently no representative carrier model analogous to the Simplified Frigate Shape (SFS) which is generic naval frigate for air flow investigation. In the present study, a Generic Aircraft Carrier (GAC) model is proposed, as a simplified, benchmark model for aerodynamic research. With the motivation to provide validation data for future CFD studies, baseline experimental data is generated in the wind tunnel, in terms of pressure distribution over the deck, for two variants, namely, a complete flat deck configuration with no island and secondly, with the island in the baseline position of the GAC. Effect of the island in modifying the flow is discussed by a comparison between the two variants. Particle Image Velocimetry (PIV) is employed to record velocity and turbulence levels in the GAC environment, highlighting regions of velocity deficits, and unsteady flow which may hinder the landing procedure of an approaching pilot. Comprehensive database of experimental data is presented as baseline data for future work and for validation of numerical models. Traditional tuft and smoke visualization studies are also conducted to provide corroboratory qualitative insights.

Comparative Genetics Using Three mtDNA Markers in Aedes aegypti (Linnaeus) Populations from Four Municipalities in the Satate of Mato Grosso, Brazil.

Aedes aegypti mosquito has spread throughout the tropical and subtropical world and is currently the primary species responsible for transmitting dengue, urban yellow fever, Chikungunya, and Zika virus. This study aimed to investigate the inter- and intrapopulational genetic variability of Aedes aegypti through mitochondrial DNA, COI, ND4, and ND5 molecular markers in four municipalities in Mato Grosso. We used the Geneious software to build dendrograms for differentiating populations from each municipality. The interpopulational genetic distance obtained from sequence analysis showed a difference within populations through groups' formation in the ordering. Besides, we identified a difference in the interindividual genetic distance values, notably for the ND5 gene from the populations captured in the four municipalities. We recorded the smallest interindividual genetic distance within populations for populations from Chapada dos Guimarães. Extrinsic factors, including breeding habitat removal, can contribute to decreasing variability. Consequently, the dendrogram showed some similarities. Ovitrap monitoring, vector elimination, and genetic flow investigation stimulate actions to prevent transmitted diseases and support essential effective measures to control and fight Ae. aegypti.

The Numerical Investigation of the Heat Transport in the Nanofluids under the Impacts of Magnetic Field: Applications in Industrial Zone

The dynamics of the nanofluid flow between two plates that are placed parallel to each other is of huge interest due to its numerous applications in different industries. Keeping in view the significance of such flow, investigation of the heat transfer in the Cu-H2O nanofluid is conducted between parallel rotating plates. For more significant results of the study, the squeezing effects are incorporated over the plates that are electrically conducting. The nondimensional flow model is then treated analytically (VPM), and the results are sketched against the preeminent flow parameters. The remarkable heat transfer in the nanofluid is noticed against the Eckert and Prandtl numbers, whereas the Lorentz forces oppose the fluid temperature. Furthermore, the shear stresses at the walls drop and the local heat transfer rate rises due to increasing flow parameters. Finally, to validate the study, a comparison is made with existing available science literature and noted that the presented results are aligned with them.