On the Characteristics of Divided Flow and Confluent Flow in Headers

抄録

Formulas for calculating the flow rate ratio of each branch pipe are derived taking the diffuser effect on divided flow and the nozzle effect on confluent flow which is caused by branching streams in a header into consideration. Effects of the divided flow factor σ_D and of the confluent flow factor σ_o in those formulas on the flow rate ratio of each branch pipe are evaluated from the experimental results for water. The factors σ_D and σ_o are dimensionless numbers given by [numerical formula] where η_σ is the diffuser factor which represents the pressure recovery factor due to branching of the fluid from a header, ψ_n is the nozzle factor due to adding of the fluid from branch pipes into a header, (ζ+λι/d) and m are the resistance coefficient of branch pipe and the ratio of crosssectional area of the header to one of the branch pipe respectively. A method for calculating the flow rate ratio of each branch pipe in the case where the inlet or the outlet of header is placed between both closed ends of the header is also presented.