Open AccessNON-STATIONARY TRANSMISSION OF HEAT AND HYGROSCOPIC MASS BETWEEN VENTIIATION FLOW OF METRO AND SURROUNDING MINING MASSIF
Author(s) -
Омар Ланчава,
Nino Arudashvili,
Zaza Khokerashvili
Publication year - 2021
Publication title -
k'art'veli mec'nierebi
Language(s) - English
Resource type - Journals
ISSN - 2667-9760
DOI - 10.52340/gs.2021.305
Subject(s) - mass transfer , massif , mechanics , thermal , ventilation (architecture) , convection , water mass , work (physics) , heat transfer , environmental science , thermodynamics , geology , physics , oceanography , geochemistry
According to modern technologies of construction and operation of transport tunnels, it is assumed in the present work that drainage of water does not occur inside the membrane in the area of reinforced coating of the tunnel and here takes place a non-stationary process of transfer of hygroscopic mass (moisture) together with а similar process of heat transfer between the ventilation stream and the surrounding mining massif. Thus, we have to deal only with the sorption mass content in the pores of the massif and the water in the explicit form in the tunnels can only be in exceptional cases as local sources and therefore, their inuence on the ventilation ow should be considered separately. The paper provides results of mathematical modeling of heat and mass transfer processes as well as graphs and nomograms, which can be used to dene non-stationary coefficients of the heat and mass transmission required for thermal physics calculation of underground ventilation. The additional ows initiated by the Soret and Dufour effects usually strengthen the main ows, but in practice one can nd a case where it is not necessary to take into account the effect of additional ows. Based on the analysis of processes, the criteria that determine the numerical value of these show the case when accounting for additional ows of Soret and Dufour is mandatory. The marked effects can be ignored when 106 Lα=1.