The Effect of Water Droplet Size on Attenuation of Fire Thermal Radiation

2007 ◽  
Vol 17 (1) ◽  
pp. 37-48
Author(s):  
Chung Kee-Chiang ◽  
Siao Jing-Lun ◽  
Chen Ou-Chia
Keyword(s):  
Thermal Radiation ◽  
Droplet Size ◽  
Water Droplet ◽  
Effect Of Water

The Effect of Water Droplet Size of Water Spray on Liquid Pool and Fire Suppression

2005 ◽  
Vol 13 (4) ◽  
pp. 315-327
Author(s):  
Yang Yu-Chuan ◽  
Su Chung-Hwei ◽  
Chung Kee-Chiang
Keyword(s):  
Droplet Size ◽  
Water Droplet ◽  
Fire Suppression ◽  
Liquid Pool ◽  
Water Spray ◽  
Effect Of Water

The Effect of Water Droplet Size on the Extinguished Concentric Jet Premixed and Diffusion Flame

2014 ◽  
Vol 493 ◽  
pp. 173-178
Author(s):  
Mega Nur Sasongko
Keyword(s):  
Droplet Size ◽  
Diffusion Flame ◽  
Water Droplet ◽  
Premixed Flame ◽  
Flame Height ◽  
Extinction Condition ◽  
Jet Flame ◽  
Effect Of Water ◽  
Burning Behavior ◽  
And Diffusion

The present research experimentally investigated the effect of different water droplet size on the burning behavior and extinction condition of concentric jet premixed and diffusion flame. Water droplet stream in line with flowing air from lower duct. The burning behavior of concentric jet flame was observed and the extinction of flame was gained by decreasing the flow rate of fuel until the flame exthinguised. The results showed that the burning behavior of concentric jet diffusion and premixed flame had the same tendency. Different water droplet size influenced the burning behavior of flame. Decreasing the water droplet size, luminosity of the flame became thin as well as reducing the flame height. However, the inhibition effect of water droplet was stronger for diffusion flame compared to premixed flame. For smaller water droplet size, water droplet was four times more effective for suppressing the diffusion flame than premixed flame

Detection of Water Droplet Size and Anion Species by Nonlinear Optical Scattering

1987 ◽  
Vol 4 (1-4) ◽  
pp. 85-89 ◽  
Author(s):  
Johannes H. Eickmans ◽  
Shi-Xiong Qian ◽  
Richard K. Chang
Keyword(s):  
Droplet Size ◽  
Water Droplet ◽  
Nonlinear Optical ◽  
Optical Scattering ◽  
Anion Species

Broadening of the Cloud Droplet Size Distribution due to Thermal Radiative Cooling: Turbulent Parcel Simulations

2020 ◽  
Vol 77 (6) ◽  
pp. 1993-2010
Author(s):  
Mares Barekzai ◽  
Bernhard Mayer
Keyword(s):  
Thermal Radiation ◽  
Droplet Size ◽  
Cloud Droplet ◽  
Droplet Size Distribution ◽  
Growth Efficiency ◽  
Droplet Growth ◽  
Radiative Cooling ◽  
Radiative Effect ◽  
Diffusional Growth ◽  
The Impact

Abstract Despite impressive advances in rain forecasts over the past decades, our understanding of rain formation on a microphysical scale is still poor. Droplet growth initially occurs through diffusion and, for sufficiently large radii, through the collision of droplets. However, there is no consensus on the mechanism to bridge the condensation coalescence bottleneck. We extend the analysis of prior methods by including radiatively enhanced diffusional growth (RAD) to a Markovian turbulence parameterization. This addition increases the diffusional growth efficiency by allowing for emission and absorption of thermal radiation. Specifically, we quantify an upper estimate for the radiative effect by focusing on droplets close to the cloud boundary. The strength of this simple model is that it determines growth-rate dependencies on a number of parameters, like updraft speed and the radiative effect, in a deterministic way. Realistic calculations with a cloud-resolving model are sensitive to parameter changes, which may cause completely different cloud realizations and thus it requires considerable computational power to obtain statistically significant results. The simulations suggest that the addition of radiative cooling can lead to a doubling of the droplet size standard deviation. However, the magnitude of the increase depends strongly on the broadening established by turbulence, due to an increase in the maximum droplet size, which accelerates the production of drizzle. Furthermore, the broadening caused by the combination of turbulence and thermal radiation is largest for small updrafts and the impact of radiation increases with time until it becomes dominant for slow synoptic updrafts.

A numerical model for estimation of water droplet size in the anode channel of a proton exchange membrane fuel cell

2019 ◽  
Vol 26 ◽  
pp. 101021 ◽  
Author(s):  
Kazem Mohammadzadeh ◽  
Bahare Jahani Kaldehi ◽  
Ramin Jazmi ◽  
Hassan Khaleghi ◽  
Reza Maddahian ◽  
...  
Keyword(s):  
Fuel Cell ◽  
Numerical Model ◽  
Droplet Size ◽  
Water Droplet ◽  
Proton Exchange Membrane ◽  
Proton Exchange ◽  
Exchange Membrane
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