THE MOVEMENT OF BUOYANT FLUID AGAINST A STREAM AND THE VENTING OF UNDERGROUND FIRES

Summary The movement of smoke and hot gases in underground tunnel fires is discussed. and some numerical data g:lven for the backf'Low against the flow. .The use of a forced ventilation installation to c'lear- the smoke is considered and it is suggested that in general little is to be gained fran it. The creation of a natural draught may be a more useful method of clearing heat and anoke • , \'