Smoke filling time for a room due to a small fire: The effect of ceiling height to floor width aspect ratio

2007 ◽  
Vol 42 (5) ◽  
pp. 329-339 ◽  
Author(s):  
N.B. Kaye ◽  
G.R. Hunt
Keyword(s):  
Aspect Ratio ◽  
Filling Time ◽  
Ceiling Height ◽  
Smoke Filling

Evaluation of the room smoke filling time for fire plumes: Influence of the room geometry

2020 ◽  
Vol 44 (6) ◽  
pp. 793-803
Author(s):  
S. Haouari‐Harrak ◽  
R. Mehaddi ◽  
P. Boulet ◽  
E.M. Koutaiba
Keyword(s):  
Fire Plumes ◽  
Filling Time ◽  
Smoke Filling

scholarly journals Impact of the room geometry on the smoke filling time due to a fire plume

2018 ◽  
Vol 1107 ◽  
pp. 042022 ◽  
Author(s):  
Samia Haouari Harrak ◽  
El Mehdi Koutaiba ◽  
Rabah Mehaddi ◽  
Pascal Boulet ◽  
Simon Becker
Keyword(s):  
Fire Plume ◽  
Filling Time ◽  
Smoke Filling

Parametrization of the fire-smoke exhaust system for a large and high-rise atrium in Shanghai through salt-bath experiment

2016 ◽  
Vol 26 (2) ◽  
pp. 272-291 ◽  
Author(s):  
Jian Wang ◽  
Juan Gui ◽  
Jun Gao ◽  
Xueli Hu
Keyword(s):  
Exhaust System ◽  
Salt Bath ◽  
Design Parameters ◽  
Smoke Movement ◽  
High Rise ◽  
Filling Time ◽  
Fire Smoke ◽  
Computational Fluid Dynamics Simulations ◽  
Dynamics Simulations ◽  
Smoke Filling

Present specifications in Building Codes in China lack design parameters for smoke exhaust for large and high-rise atrium in buildings. An investigation of natural smoke filling and parametrization of fire-smoke exhaust in an atrium building in Shanghai was conducted based on salt-bath experiment, due to dynamic analogy between thermal smoke movement in air and brine dispersion in water. To obtain a small, scaled-down version of an atrium with a high polyfoam fire up to 1 MW, the brine-bath experiment was conducted with calcium chloride for small strength fire in small-space rooms, to demonstrate the natural smoke filling within the atrium. The interface height and filling time derived was highly comparable to those obtained by empirical equations. The results of computational fluid dynamics simulations agreed well with the salt-bath experiments. The evacuation time was also calculated with a dimensionless interface height of 0.2 to determine whether there was sufficient time for occupants to escape. The smoke filling process under mechanical smoke exhaust was also investigated by experiments, to parametrize the fire smoke exhaust system in the atrium. The optimal smoke exhaust level, natural and mechanical make-up level were determined and were recommended as the design parameters for the construction of atrium in buildings.

A Short Note on Using a Time Constant in Specifying Smoke Filling Time in an Atrium Under an Unsteady Fire

1995 ◽  
Vol 13 (6) ◽  
pp. 434-444 ◽  
Author(s):  
W.K. Chow
Keyword(s):  
Control Systems ◽  
Time Constant ◽  
Short Note ◽  
Zone Model ◽  
Smoke Control ◽  
Fire Zone ◽  
Filling Time ◽  
Version 2.0 ◽  
Smoke Filling

A time constant derived from a t-squared fire with the geometry of an atrium is proposed to specify the smoke filling time. The smoke filling pro cesses in 27 atria with volume varying from 2,500 to 35,000 m3 were simulated by the fire zone model CFAST version 2.0. The atria are located adjacent to a "fire" shop at a lower level. Correlation relationships between the smoke filling time and the time constant are derived. Further, performance of smoke control systems in the atria are evaluated.

scholarly journals Simple Equations for Predicting Smoke Filling Time in Fire Rooms with Irregular Ceilings

2005 ◽  
Vol 24 (4) ◽  
pp. 165-177 ◽  
Author(s):  
Jun-ichi Yamaguchi ◽  
Takeyoshi Tanaka
Keyword(s):  
Filling Time ◽  
Simple Equations ◽  
In Fire ◽  
Smoke Filling

Modification of MnS inclusion by tellurium in 38MnVS6 micro-alloyed steel

2020 ◽  
Vol 117 (6) ◽  
pp. 615
Author(s):  
Ping Shen ◽  
Lei Zhou ◽  
Qiankun Yang ◽  
Zhiqi Zeng ◽  
Kenan Ai ◽  
...  
Keyword(s):  
Fatigue Life ◽  
Aspect Ratio ◽  
Strong Influence ◽  
Experimental Results ◽  
Alloyed Steel ◽  
Equivalent Diameter ◽  
Small Aspect Ratio ◽  
Steel Quality ◽  
Eds Analysis ◽  
Micro Alloyed Steel

In 38MnVS6 steel, the morphology of sulfide inclusion has a strong influence on the fatigue life and machinability of the steel. In most cases, the MnS inclusions show strip morphology after rolling, which significantly affects the steel quality. Usually, the MnS inclusion with a spherical morphology is the best morphology for the steel quality. In the present work, tellurium was applied to 38MnVS6 micro-alloyed steel to control the MnS inclusion. Trace tellurium was added into 38MnVS6 steel and the effect of Te on the morphology, composition, size and distribution of MnS inclusions were investigated. Experimental results show that with the increase of Te content, the equivalent diameter and the aspect ratio of inclusion decrease strikingly, and the number of inclusions with small aspect ratio increases. The inclusions are dissociated and spherized. The SEM-EDS analysis indicates that the trace Te mainly dissolves in MnS inclusion. Once the MnS is saturated with Te, MnTe starts to generate and wraps MnS. The critical Te/S value for the formation of MnTe in the 38MnV6 steel is determined to be approximately 0.075. With the increase of Te/S ratio, the aspect ratio of MnS inclusion decreases and gradually reaches a constant level. The Te/S value in the 38MnVS6 steel corresponding to the change of aspect ratio from decreasing to constant ranges from 0.096 to 0.255. This is most likely to be caused by the saturation of Te in the MnS inclusion. After adding Te in the steel, rod-like MnS inclusion is modified to small inclusion and the smaller the MnS inclusion, the lower the aspect ratio.

Correlation of Data Obtained by Radiocardiography and Right-Heart Catheterization in Cardiac Patients

1968 ◽  
Vol 07 (02) ◽  
pp. 125-129
Author(s):  
J. Měštan ◽  
V. Aschenbrenner ◽  
A. Michaljanič
Keyword(s):  
Capillary Pressure ◽  
Transit Time ◽  
Right Heart Catheterization ◽  
Heart Catheterization ◽  
Right Heart ◽  
Pulmonary Capillary ◽  
Filling Time ◽  
Pulmonary Capillary Pressure ◽  
The Mean ◽  
Pulmonary Transit Time

SummaryIn patients with acquired and congenital valvular heart disease correlations of the parameters of the radiocardiographic curve (filling time of the right heart, minimal pulmonary transit time, peak-to-peak pulmonary transit time, and the so-called filling time of the left heart) with the mean pulmonary artery pressure and the mean pulmonary “capillary” pressure were studied. Further, a regression equation was determined by means of which the mean pulmonary “capillary” pressure can be predicted.

PENINGKATAN KEMAMPUAN GURU BAHASA INDONESIA DALAM MENYUSUN RENCANA PROGRAM PEMBELAJARAN (RPP) SDN 015 PAGARAN TAPAH DARUSSALAM MELALUI METODE PEMBERIAN TUGAS

2017 ◽  
Vol 5 (3) ◽  
pp. 713
Author(s):  
Mukhlis '
Keyword(s):  
Aspect Ratio ◽  
Duty Cycle ◽  
Lesson Plans ◽  
Learning Program ◽  
School Subjects ◽  
Bahasa Indonesia

Based on the observation of some teachers found the symptoms as follows: the lack of abilityof Indonesian teachers in designing learning program (RPP), the learning device is only usedas a supplement and not to the needs of teaching, most teachers again if asked the lessonanswered not have or has not been made. The purpose of this research is to improve theability of Indonesian teachers in designing learning program (RPP) at SDN 015 PagaranTapah Darussalam through the method of administration tasks. This type of research is actionresearch school. Subjects in this study were teachers Indonesian as many as 12 people. Basedon the analysis and discussion can be concluded that the method of administration tasks canimprove the ability of Indonesian teachers in making learning device in SDN 015 PagaranTapah Darussalam through the method of administration tasks. Under these conditions, thelevel of acceptance of teachers increased. The aspect ratio capability Indonesian teachers inpreparing lesson plans through the provision of duty cycle I and II of the increase from 56%and the second cycle to 79%.

Sign in / Sign up

Export Citation Format

Share Document