On the Theory of the Additional Loss in Entrance of Very Viscous Fluid-II (On the Influence of an Upper Vessel

摘要

Previously，the theoretical value of an Additional Loss in Entrance of very viscousf1uid flowing into a pipe with roundish entrance from a large vessel was obtained. Inthis paper，the author investigates theoretically how it changes when the form of upper vessel is taken into account.As the form of entrance of Saybolt and Ubbelohde viscosimeter is very complicatedthe author performed the theoretical calculation under the simple assumption that the cross sectional view is made of straight and arch 1ines. The resu1ts show that:1) If an inner radius of a vessel is five or more times larger than tha t of a pipe，the additional loss in entrance is about constant.2) When the pressure loss in a vessel is taking into account， the additional lossincreases if an inner radius of a vessel is less than ten times that of a pipe， and isabout constant if the former is ten or more times larger than the latter