In situ drag coefficient measurements for rooftop trees

Drag Coefficient Measurements for Typical Bomb and Projectile Fragments

The FRAGHAZ computer program has been developed to predict the hazardous regions due to fragments produced by an accidential explosion of stored ammunition. Determination of these hazardous regions is based on computer simulations of fragment trajectories. Currently, the fragment drag coefficients used in the program are extrapolations of subsonic drag coefficients out to transonic and superson...

On the subtraction method for in-situ reflection and diffusion coefficient measurements.

The subtraction method is a technique critical to several important acoustic measurements. It involves subtracting a reference measurement including only direct sound from one with direct sound and a reflection, to isolate the reflection. The process is very sensitive to environmental conditions, such as changes in temperature, air movement, and microphone positioning. These variations cause sm...

A New Correlation for Drag Coefficient of Extrudate Quadralobe Particles by CFD Simulation

Viscometer using drag force measurements.

A robust and precise viscometer using the forces exerted by a laminar flow inside a small duct is presented: the force is measured on a long cylindrical sensor dipped into the flow. Two devices of respective volumes 1.4 and 0.031 ml have been realized, demonstrating that the technique is usable with small fluid volumes. Several Newtonian and non-Newtonian fluids have been tested at shear rates ...

A transportable magnetic resonance imaging system for in situ measurements of living trees: the Tree Hugger.

This paper presents the design of the 'Tree Hugger', an open access, transportable, 1.1 MHz (1)H nuclear magnetic resonance imaging system for the in situ analysis of living trees in the forest. A unique construction employing NdFeB blocks embedded in a reinforced carbon fibre frame is used to achieve access up to 210 mm and to allow the magnet to be transported. The magnet weighs 55 kg. The fe...