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Articles 1 - 3 of 3
Full-Text Articles in Mechanical Engineering
Transient Analysis Of Full Scale And Experimental Downburst Flows, Junayed Chowdhury
Transient Analysis Of Full Scale And Experimental Downburst Flows, Junayed Chowdhury
Electronic Thesis and Dissertation Repository
Downbursts are highly transient natural phenomena which produce strong downdrafts evolving from a cumulonimbus cloud They induce an outburst of damaging winds on or near to the ground causing an immense damage to the ground mounted structures and aircrafts. This study investigates the transient nature of downbursts using wind speed records from full scale downburst events employing an objective methodology. This method can detect the abrupt change points in a downburst time series based on statistical parameters such as mean, standard deviation and linear trend. In addition to the analysis of the full scale downburst events, several large scale experimental …
On The Reduction Of The Driving Force In Shear-Driven Flows, Sakib Shadman
On The Reduction Of The Driving Force In Shear-Driven Flows, Sakib Shadman
Electronic Thesis and Dissertation Repository
In shear-driven flows, an external driving force is needed to maintain the relative movement of horizontal plates. This thesis presents a systematic analysis on using spatially periodic heating and grooved surfaces to control this force. It is found that the use of periodic heating creates a buoyancy-driven effect that always reduces this force. The use of proper heating may even lead to the complete elimination of this force. It is further found that the use of isothermal grooved surfaces always enhances flow resistance, resulting in an increase of this force. When grooves and heating are applied together, their interaction induces …
A Numerical Investigation Of Human Cough Jet Development And Droplet Dispersion, Ran Bi
A Numerical Investigation Of Human Cough Jet Development And Droplet Dispersion, Ran Bi
Electronic Thesis and Dissertation Repository
As part of the Western Cold and Flu aerosol (WeCoF) studies, the present study provides Computational Fluid Dynamics (CFD) modelling of human cough flow. The cough flow is characterized in two different aspects, the flow field and the droplets. In the study of the flow field of coughing, various dynamic characteristics, including the velocity variation, streamwise penetration and power spectral density, are examined. CFD simulations using two different approaches, the unsteady Reynolds Averaged Navier-Stokes (URANS) and the large eddy simulation (LES), are performed for comparison purposes. The numerical results are validated by the experimental data obtained from the measurements by …