Experimental Study of the Interaction Between Water Sprays and Smoke Layer

A laboratory experimental work is carried out to investigate the attenuation ability of water sprays subjected to thermal radiation. The objective is to analyze the key parameters involved in the mitigation properties of this fire protection technique. The spectral transmittances of two types of sprayers, TG03 and TG05, are measured with a Fourier infrared spectrometer under various conditions. The wavelength range varies from 1.5 to 12 μm. The influence on the transmittance of both the flow rate and the pressure ranging from 1 to 7 bars, as well as the effect of the number of spray nozzles are considered. The results clearly show the advantage of small drops with high concentration. An investigation on the multi-ramp curtain configuration also provides valuable information on the mitigation behavior of the whole spray. Key guidelines are provided for fire protection engineering.

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Experimental study of non-boiling heat transfer from a horizontal surface by water sprays

Experimental Thermal and Fluid Science ◽

10.1016/j.expthermflusci.2007.06.007 ◽

2007 ◽

Vol 32 (2) ◽

pp. 571-579 ◽

Cited By ~ 29

Author(s):

Nitin Karwa ◽

Sunil R. Kale ◽

P.M.V. Subbarao

Keyword(s):

Heat Transfer ◽

Experimental Study ◽

Boiling Heat Transfer ◽

Horizontal Surface ◽

Water Sprays

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Experimental study of the downward displacement of fire-induced smoke by water sprays

Fire Safety Journal ◽

10.1016/j.firesaf.2012.10.014 ◽

2013 ◽

Vol 55 ◽

pp. 35-49 ◽

Cited By ~ 33

Author(s):

Z. Tang ◽

Z. Fang ◽

J.P. Yuan ◽

B. Merci

Keyword(s):

Experimental Study ◽

Downward Displacement ◽

Water Sprays

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Experimental study on the restoration from a tilt-azimuth series for improvement in resolution

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s042482010013955x ◽

1995 ◽

Vol 53 ◽

pp. 636-637

Author(s):

Norio Baba ◽

Norihiko Ichise ◽

Syunya Watanabe

Keyword(s):

Experimental Study ◽

Spherical Aberration ◽

Incident Beam ◽

Optical Parameters ◽

Beam Tilting ◽

Illumination Method ◽

Restoration Method ◽

Illumination Mode

The tilted beam illumination method is used to improve the resolution comparing with the axial illumination mode. Using this advantage, a restoration method of several tilted beam images covering the full azimuthal range was proposed by Saxton, and experimentally examined. To make this technique more reliable it seems that some practical problems still remain. In this report the restoration was attempted and the problems were considered. In our study, four problems were pointed out for the experiment of the restoration. (1) Accurate beam tilt adjustment to fit the incident beam to the coma-free axis for the symmetrical beam tilting over the full azimuthal range. (2) Accurate measurements of the optical parameters which are necessary to design the restoration filter. Even if the spherical aberration coefficient Cs is known with accuracy and the axial astigmatism is sufficiently compensated, at least the defocus value must be measured. (3) Accurate alignment of the tilt-azimuth series images.

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