The resistance caused on pipe lines in mine airway depends on the sectional ratio, showed the size of pipe to airway. The, model drift made of galvanized iron plates, 287. 5mm diameter, was used for the measurement of pressure drop along the lied pipe lines.
Generally, underground conditions are far from ideal, laboratory study for models has been tried, and author's present experiments are aimed at finding the size and arrangement for the pipe lied a drift likely to be most effective.
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