A transient-flow syringe air permeameter

A transient-flow syringe air permeameter

In response to the need to better describe spatial variations in permeability, we designed and built a new portable field air permeameter for use on rocks in outcrop and core. In this instrument, a chamber containing a small volume of air in contact with the rock is suddenly increased in volume creating a vacuum, causing air to flow from the rock into the chamber. The instantaneous chamber volu...

Efficacy of air/water syringe tip sterilization.

BACKGROUND Dental procedures involve contact between instruments and the patient's tissues, blood or saliva. This study evaluated the efficacy of the standardized sterilization of non-disposable air/water syringe tips and corrosion and contaminant build-up in these tips. METHODS The bacterial contamination of single-use and multiple-use non-disposable air/water syringe tips after routine use ...

Analysis of Transient Flow in the Case of Secondary Injection for Transient Vector Control (RESEARCH NOTE)

The purpose of this paper is to analyze the flow field structure in transient state and performance of secondary injection system for thrust vectoring in divergent section of a two-dimensional nozzle. Secondary injection for thrust vectoring in a two-dimensional nozzle is studied by solving three-dimensional Reynolds-averaged equations by means of fluent solver. Spalart-allmaras model was used ...

Introduction to Transient Flow

To this point we have emphasized steady flows, flows that do not change with time at any location in the pipeline system. In this brief chapter we will introduce two general categories of unsteady flow that we call transient flow. All transient flows are transitions, of long or short duration, from one steady flow state to another. Either of these end states may be the rest state. Each transien...

Transient free convective flow of a micropolar fluid between two vertical walls