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Abstract
This paper deals with results of tests made on the following matters.(1) The flow through the rectangular orifice fitted on a rectangular air duct.(2) The divided flow at the tee branch for a circular air duct.As the results of expeiments, the following empirical formulae have been obtained(1) Coefficient of resistance at the rectangular orifice.ζ= (Ad/αA0-1) 2α=0.625+0.375 (A0/Ad) 3(2) Loss in the divided flow at the tee branch for a circular air duct.Main duct P=0.05 Hm 0.6 S2HmBranch duct P=0.99 Hm+0.341 HbWhereζ=coefficient of resistanceA0=sectional area of orificeAd=sectional area of ductP=pressure loss, mmAqHm=velocity head in the main duct, mmAqHb=velocity head in the branch duct, mmAqS=flow quantity ratio
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