Micropore filters are used during extracorporeal circulation to prevent gaseous and solid particles from entering the patient's systemic circulation. Although these devices improve patient safety, limitations in current designs have prompted the development of a new concept in micropore filtration. A prototype of the new design was made using 40-μm filter screens and compared against four comme...

An experiment is described where the evolution of a single vapor bubble in water was observed. The bubble was generated by an electric spark between two electrodes designed to provide minimal interference to both liquid motion and the propagation of acoustic waves. The electrostatic energy of the discharge was varied to obtain vapor bubbles with radii ranging from about 2 to 5 centimeters. A hi...

The average pressure inside a sonoluminescing bubble in sulfuric acid has been determined by two independent techniques: (1) plasma diagnostics applied to Ar atom emission lines, and (2) light scattering measurements of bubble radius vs time. For dimly luminescing bubbles, both methods yield intracavity pressures approximately 1500 bar. Upon stronger acoustic driving of the bubble, the sonolumi...

Bubbles are everyday objects and easy to make? Not so, when one is trying to generate and maintain tiny bubbles with accurately defined volumes in the nanoliter range or even smaller. This follows from the fact that the gas/liquid interface (the bubble boundary) is energetically expensive. As a consequence, this interface has a tension g and the bubble has a spherical shape (with radius R), whi...

We consider a pressure (density) in a square flume solid boundaries and no-slip format condition formulation are introduced to investigate cavitation bubble for the two-dimensional lattice Boltzmann method (LBM). Using the coupling Carnahan-Starling equation of state (C-S EOS) and exact difference method (EDM) based on modified Shan-Chen model, the whole process of bubble collapse was observed ...

We study the dynamical behavior of a large bubble embedded in the plug flow of an ordered two-dimensional foam. At a critical velocity, the foam structure becomes instable and the large bubble migrates through the foam faster than the mean flow. This size segregation is due to viscous effects and happens only for flow velocities larger than a given threshold. We present analytical and numerical...

Background: In this study, we aimed to compare ventilator-derived and bubble continuous positive airway pressure (CPAP) in neonates with respiratory distress syndrome admitted to Neonatal Intensive Care Unit of Vali-e-Asr Hospital, Birjand, Iran, in 2014. Methods: This cohort study was conducted among 68 patients assigned into two groups. The neonates in group A (32 infants) were treated with b...

-The effect of elevated pressure on the stability of the homogeneous bubbly flow regime in a gas-liquid bubble column is examined. Experiments were performed in a 0.15 m diameter bubble column operated at pressures in the range 0.1-1.3 MPa with nitrogen as the gas phase and water as the liquid phase. The transition from homogeneous to heterogeneous flow regime was determined by two procedures. ...

This study investigates the effects of wall wettability on cavitation bubble collapse using pseudopotential lattice Boltzmann method with an appropriate external force term and contact angle boundary condition. The accuracy proposed numerical approach is verified by simulating a single-bubble near neutral wall. result shows that condition has significant effect forces exerted bubbles. For hydro...