Submerged pile groups are important components of complex piers in hydraulic engineering and analogs for a range subsea structures. These may sustain severe damages from local scour. The velocity intensity ( U / c , the ratio critical to mean velocity) aspect H D p height diameter) variables this scour process. However, previous studies on around submerged were conducted clear-water conditions ...

Four commercially available sidewall air inlets and one sharp-edged rectangular opening were tested in a fullscale building section under similar isothermal conditions. Large differences were found between inlets for airjet spread, axial velocity decay, airjet throw, and entrainment ratio. A criterion was derived for evaluating inlets utilizing airjet throw, airjet spread, entrainment ratio, an...

An aerodynamic problem on an air flow around a large aspect ratio rectangular wing is investigated in this study. According to the theory of Vlasov, considered be thin rod. External loads are assumed proportional airfoil angle attack related dimensionless coefficient lift and pitching moment coefficient. These coefficients depend parameters Mach number M determined by experimental measurements ...

the khorasan region is one of the active seismic zones in iranian plateau, which is located between central iran and kopet-dagh zones. we study the crustal thickness (h) and vp/vs ratio (k) in mashhad, capital of razavi khorasan province by the receiver function method. this study uses teleseismic events recorded by an array of three broadband stations of khorasan seismic network, earthquake re...

bubble columns are gas- liquid contactors that are widely used in chemical and bio- chemical industries. high mixing that result in high heat and mass transfer rates are amongst their advantages. heat transfer in a bubble column having a bundle of heaters investigated and the variation of heat transfer coefficient with variation in heaters pitch to diameter ratios in a bundle of heaters reporte...