Backward Reaction Force in a Firehose

Vera, Francisco; Rivera, Rodrigo; Núñez, César

doi:10.1007/s10694-018-0719-x

Cited by 2 publications

(3 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Knowing the radiative heat flux densities, the radiative attenuation can be computed using Equation (6). The performance of the sensors degrades over time and their response coefficient varies with the aging of the sensor as it is exposed to harsh environments.…”

Section: Extended Radiative Attenuation Quantificationmentioning

confidence: 99%

“…In France, three standards [?, ?, ?, ?, ?, ?, ?, ?, 2,3] Despite the fact that these nozzles are common tools for firefighters, few scientific studies have been performed to assess the efficiency of these extinction devices. To the best of our knowledge, the most recent studies on fire hose nozzle mainly concern the evaluation of the "backward reaction", as treated by Vera et al [5,6], Chin et al [7] or Sun et al [8]. However, no particular literature is devoted to the thermal efficiency of hose nozzles for firefighting operations.…”

Section: Introductionmentioning

confidence: 99%

“…Figure4Bshows the spectral attenuation estimated with Equation(6) based on data provided by the spectrometer for Nozzle #1. It can be seen that the spectral attenuation varies only slightly as a function of the wavenumber, weakly decreasing as the wavenumber increases.…”

mentioning

confidence: 99%

See 2 more Smart Citations

Quantification of radiative attenuation provided by fire hose nozzles

Suzanne

Testa

Doelsch³

et al. 2022

Fire and Materials

View full text Add to dashboard Cite

The aim of this study was to investigate the radiative protection provided by various fire hose nozzles used by several Fire Rescue Services in France and to propose an experimental set-up to quantify it. This study combined the use of radiative sources (a radiant panel or a fire inside a standard shipping container) and metrological devices (radiative heat sensors, IR camera and spectrometer) to estimate the radiative attenuation of water sprays used to protect the firefighters against thermal effects which occur during a fire. For all the fire hose nozzles tested in this work, the maximal effective attenuation reaches 75%. For most of them, an increase of the flow rate improves the radiative attenuation. However, this study shows that a similar attenuation can be reached for different flow rates, suggesting that the droplet size diameter and the droplet volume fraction also play a significant role in the efficiency of the provided spray.

show abstract

Section: Extended Radiative Attenuation Quantificationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Quantification of radiative attenuation provided by fire hose nozzles

Suzanne

Testa

Doelsch³

et al. 2022

Fire and Materials

View full text Add to dashboard Cite

show abstract

Flow of water out of a funnel

Otto,

Mungan

2024

Eur. J. Phys.

View full text Add to dashboard Cite

The unsteady Bernoulli equation is used to numerically determine the surface height and velocity distribution of water flowing out of a conical tube as a function of time. The speed is found to interpolate between freefall for a cylindrical pipe of constant radius and Torricelli’s law for a funnel having a small exit hole. In addition, the applied force needed to hold the conical vessel in place is calculated using Newton’s second law including the rocket thrust due to the water flowing out of the funnel. A comparison is made with the analogous expressions for the flow through and holding force on a right cylindrical tank having a hole in its bottom face. The level of presentation is appropriate for an undergraduate calculus-based physics course in mechanics that includes a module on fluid dynamics.

show abstract

Backward Reaction Force in a Firehose

Cited by 2 publications

References 5 publications

Quantification of radiative attenuation provided by fire hose nozzles

Quantification of radiative attenuation provided by fire hose nozzles

Flow of water out of a funnel

Contact Info

Product

Resources

About