The Measurement of Transient Two-Dimensional Profiles of Velocity and Fuel Concentration Over Liquids

Ito, Akihiko; Narumi, Akira; Konishi, Tadashi; Tashtoush, Ghassan; Saito, Kozo; Cremers, C. J.

doi:10.1115/1.2825994

Cited by 24 publications

(10 citation statements)

References 16 publications

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“…The holographic interferometer was essentially the same as that used in previous studies. 9,13,15 The light source was a 30 mW He-Ne laser. The laser beam was divided into two beams by a partially reflecting mirror.…”

Section: B Infrared Absorptionmentioning

confidence: 99%

Simultaneous measurement of temperature and chemicalspecies concentrations with a holographic interferometer and infrared absorption

et al. 2006

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What is believed to be a new technique that allows for the simultaneous measurement of 2D temperature and chemical species concentration profiles with high spatial resolution and fast time response was developed and tested successfully by measuring a thin layer of fuel vapor created over a volatile fuel surface. Normal propanol was placed in an open-top rectangular container, and n-propanol fuel vapor was formed over the propanol surface in a quiescent laboratory environment. An IR beam with a wavelength of 8-13 mum emitted from a heated plate and a He-Ne laser beam with a wavelength of 632 nm were combined and passed through the n-propanol vapor layer, and both beams were absorbed by the vapor layer. The absorption of the IR beam was recorded by an IR camera, and the He-Ne laser was used to form a holographic interferogram. Two-dimensional temperature and propanol vapor concentration profiles were, respectively, determined by the IR absorption and the fringe pattern associated with the holographic interferogram. This new measurement technique is a significant improvement over the dual wavelength holographic interferometry that has been used previously to measure temperature and fuel concentration, and it is ready for application under different types of fire and flame conditions.

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Section: B Infrared Absorptionmentioning

confidence: 99%

Simultaneous measurement of temperature and chemicalspecies concentrations with a holographic interferometer and infrared absorption

et al. 2006

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“…2, the passage I (5 mm-clearance in the upper part) connects chamber A and B via chamber C and the passage II (10 mm-clearance in the lower part) connects the chamber A and B directly. A fuel container was made from Pyrex glass and the dimension was 10 mm wide, 30 mm deep and 150 mm long as described in our previous paper [14][15][16]. An ignition device was assembled with a dc-battery, a distributor and an ignition plug of an automobile.…”

Section: Small-scale Combustion Chambermentioning

confidence: 99%

Experimental And CFD Investigations On Compartment Explosion With Ignition And Fuel Sources Located In Different Compartment

Konishi¹

2005

Fire Safety Science - Proceedings of the Eigth International Sy

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In order to elucidate a complicated accident of boat explosion, experimental and CFD investigations by using a 2-D small-scale chamber and a 3-D large-scale mock-up model are demonstrated. In case that a chamber is divided into several compartments having different locations of ignition and fuel sources, the explosion process becomes more complicated. In our 2-D chamber with three compartments, flame nucleus is initially established in the ignition compartment and propagates at the laminar flame velocity. After the spreading flame erupts through a narrow gap into next compartment, flame becomes turbulent and accelerates. As a result, the premixed combustion happened in the ignition compartment, but did not give significant pressure rise due to a low value of laminar burning velocity. The mock-up model and CFD model are used for verifying the actual boat explosion. The flammable limit of gasoline vapor in the ignition compartment is established in the 1.7th day to the 175th day since fuel was leaked from the fuel-source compartment. The experiments on vapor diffusion process are also compared with CFD results. The calculated concentration profiles on 2D and 3D model are fairly good agreements with the results of the experiments. Finally, the reproducibility test of the boat explosion was successfully carried out by the mock-up boat.

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“…In our past studies [1,2,5], we focused on obtaining accurate and detailed measurements of flow (both liquid and gas), temperature (both liquid and gas) and gaseous fuel concentrations generated by the spreading flame. The flame spread phenomenon is highly transient, involving both liquid and gas phases that interact with each other through the exchanges of momentum, heat, and mass, and the critical transport of those quantities that occur in the gas and liquid phases within several millimeters of its interface and a few centimeters upstream from the flame's leading edge.…”

Section: Introductionmentioning

confidence: 99%

Measurement Of A 3-D (Gas And Liquid) Flow Structures Generated By A Spreading Flame Over N-butanol

Tashtoush¹,

Saito²,

Cremers³

et al. 2000

Fire Safety Science - Proceedings of the 6th International Symp

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This paper discusses a new 3-D experimental data that were obtained by a laser-sheetparticle-tracking (LSFT) technique for a spreading flame over n-butanol. The major heattransfer process between the flame's leading edge and the liquid is a highly transient phenomenon involving both liquid and gas phases. These interact with each other through exchanges of momentum, heat, and mass. We improved our original 2-D LSPT and made it applicable to study 3-D measurement. Using this new 3-D LSPT we measured a series of velocity profiles in a pulsating flame spread over n-butanol at different distances above or below the liquid surface and obtained 3-D flow visualization in both liquid and gas phases. The new LSPT confirmed the existence of twin vortex flow on the liquid surface and deep in the liquid a few mm below the surface. These vortices gradually disappear as the laser sheet moves down from the liquid surface. A similar twin-vortex structure in the gas phase was also observed for the first time. These results proved that the convective flow in both liquid and gas phases is 3-D in nature in the three trays we have used.

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The Measurement of Transient Two-Dimensional Profiles of Velocity and Fuel Concentration Over Liquids

Cited by 24 publications

References 16 publications

Simultaneous measurement of temperature and chemicalspecies concentrations with a holographic interferometer and infrared absorption

Simultaneous measurement of temperature and chemicalspecies concentrations with a holographic interferometer and infrared absorption

Experimental And CFD Investigations On Compartment Explosion With Ignition And Fuel Sources Located In Different Compartment

Measurement Of A 3-D (Gas And Liquid) Flow Structures Generated By A Spreading Flame Over N-butanol

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