Oxygen gas-liquid mass transfer coefficient was measured in a gas-induced pulsating flow bubble column. Pulsating amplitude had a great influence on kla under pulsating state of equal base flow and pulsating flow, which was enhanced up to 30 % compared with that under steady state; however, it had a negative effect on mass transfer under a fixed low base flow. It was also found that kla had a n...

We simultaneously measure the flow rate and the normal force on the base, near the outlet, during the discharge through an orifice of a dense packing of monosized disks driven by a conveyor belt. We find that the normal force on the base decreases even when a constant flow rate is measured. In addition, we show, by changing the mass of the disks, that pressure can be changed while the flow rate...

A generalized formulation of combustion-acoustic coupling at simultaneous multiple timeand length-scales is presented. The compressible Navier Stokes equations are expanded about the mean flow Mach number M and the ratio of flow and acoustic length scales h/L. This results in the equations separating into the one governing the incompressible base flow evolving at longer time and shorter length ...

Purpose: Assessment of the efficacy of nasoseptal vascularized flap (NSF) in reconstructing the skull base defects after transsphenoidal procedures and CSF rhinorrhea. Material and Methods: Thirteen patients with intraoperative diagnosis of skull base defects and/or CSF leak after endoscopic transsphenoidal surgery or preoperative diagnosis of CSF rrhinorhea were included in this study. Multila...

This paper aims to understand how a micro synthetic jet actuator works effectively to prevent the boundary layer flow from laminar separation aused by adverse pressure gradient. Experimental results showed that synthetic jets were effective when the forcing frequency was a lower frequency f the Tollmien–Schlichting (T–S) wave, which received amplification from the base flow. They demonstrated t...

A three-dimensional computational fluid dynamics model of a proton exchange membrane fuel cell (PEMFC) with both gas distribution flow channels and Membrane Electrode Assembly (MEA) is developed. A set of conservation equation is numerically solved by developing a CFD code based on the finite volume technique and SIMPLE algorithm. In this research, some parameters like oxygen consumption, water...

abstract the goal of this research is simulating an optimum reactor to eliminate greenhouse gases, mainly co2, through combined cycle in stacks of power plant, using a strong base (sodium hydroxide) thinned by water. during this process sodium bicarbonate salt is generated together with water and the produced salty water is desalinated and its useful salts are also extracted. four scenarios hav...