In this paper, there are reported the experimental studies on burning of the pile of paper tubes, the axis of which are parallel to the convection air stream.
The following results are obtained.
(1) There are three types in the form of propagation of burning along the pile of paper tubes.
(2) It can be easily known to which one of the three types the form of propagation belongs, when the tubes’ diameter, the slope of the plane, etc. are given.
(3) When the lower end of paper tube is closed, and the greater the velocity of wind the greater is the velocity of burning. But when the lower end of paper tube is opened, the relation between the velocities of wind and of burning does not follow to a simple law.
(4) The greater the diameter of tube, the greater is the velocity of burning in the direction of depth, having no relation to the lower end of paper tube being closed or not. But as the wind becomes stronger, the burning velocity of the closed-end-tubes becomes greater, while the burning velocity of the open-end-tubes becomes smaller.
(5) The three dimentional “Terada phenomenon” is observed.
(6) The direction of spread of burning of the closed-end-tubes is not the same as that of the open-end-tubes.
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