Heat and mass exchange in permanent mine workings

Heat, smoke and other toxic products may spread along the tunnel, in both directions from the seat of fire, causing different kinds of damage to people. Anyway, underground fire causes complicated results, which is preventing factor for life rescue and evacuation, creating difficulties for firemen and life rescue crew. Analysis of the critical speed, which is necessary for the effective management of combustion products, has been made for tunnel fires with high heat release rate. The characteristic changes in the critical Froude number in the work are presented in accordance with the critical speed. Particularly, it was noted that the formula determining the critical speed requires knowledge of the average smoke temperature, while the formula for calculating the last value includes the value of the required critical speed. In order to overcome this, Froude’s critical number Frc=4.5 has been introduced, which is not the way of solution, as it directly means constant critical velocity for the fire of any power and accordingly, does not correspond to experimental data.

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“…The results of simultaneous heat and moisture transfer in the tunnels were investigated previously [24,25].…”

Section: Positive and Negative Directions Of Ventilation Streammentioning

confidence: 99%

Critical velocity analysis for safety management in case of tunnel fire

Lanchava

Iliaş

2020

MATEC Web Conf.

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“…5 (1974 On the basis of the theory presented in [I], I proposed in [2], and solved a system of differential equations of energy and mass transfer with boundary conditions of the third kind for a rock mass around permanent workings. Shevelev, "Nature and mechanism of ejections based on gasdynamics," U8ol' Ukrainy, No.…”

Section: Literature Citedmentioning

confidence: 99%

“…The width of the conductive paper for each particular case was determined according to (2) in the appropriate geometric scale.…”

Section: Literature Citedmentioning

confidence: 99%

“…This distribution for nondimensional temperature depends on the Biot and Fourier criteria and also on the parametric criterion K, expressed by relation (2). This can be rewritten as ;(~, I~.,)=~, (K, IJi, v,,).…”

Section: Literature Citedmentioning

confidence: 99%

“…It has been established [2] that the general solution of nondimensional mass transfer potential on the surface for the case of nonisothermal mass transfer appears as O(T, R0)= f(Bi,.. Fo,., Pn,.>.…”

Section: (1o)mentioning

confidence: 99%

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Heat and mass exchange in newly driven mine workings

Lanchava¹

1985

Soviet Mining Science

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Analysis of the use of transformable elements in intelligent tunnel ventilation systems

et al. 2022

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All main and auxiliary equipment in the tunnel with an intelligent ventilation system are designed to ensure the safety. These systems “talk” and “listen” to each other, make decisions to switch on/off certain system(s) or part(s) thereof and duly inform the tunnel operator, who is authorized to the centralized control of all systems of necessity. The present article uses the numerical models to assess the efficiency of the transformable elements ensuring safe operation of the tunnels. The idea of their use is based on an artificial increase of the tunnel aerodynamic resistance by means of a flexible element, which will hamper the dissemination of combustion products, but not the movement of people through the tunnel and will help isolate clean and polluted air masses. Such resistance will be used to swiftly divide the tunnel carriageway into smaller sections what will help extinguish the fire as early as at its initial stage, prolong the evacuation time and save lives during the strong uncontrollable fires. As for the compact transformable element, it can be used in both, the operating and the planned tunnels, as it in practice does not reduce the volume of valuable underground space.

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Heat and mass exchange in permanent mine workings

Cited by 7 publications

References 2 publications

Critical velocity analysis for safety management in case of tunnel fire

Critical velocity analysis for safety management in case of tunnel fire

Heat and mass exchange in newly driven mine workings

Analysis of the use of transformable elements in intelligent tunnel ventilation systems

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