エアリフトポンプによる固体粒子の輸送特性 (第3報)

Abstract

This paper describes the experimental results of pressure head loss in air-water two phase flow and air-water-solid three phase flow. Moreover, theoretical considerations are given to the estimation of lifted solids, from a viewpoint of momentum theory, and the calculated values are compared to the measured ones which were already shown in the 1st and 2nd report.The results obtained will be summarised as follows.(1)The pressure loss in two phase flow was well arranged by following empirical equation, into which the physical properties of fluid were considered.ΔP2flΔPιo=α-α'fL2, α=-1.01Ke2+1.62Ke+1.03, α'=1.32K2e-0.38Ke-1.72, K2=1-2θ/πthen, 50°≤θ≥90°, especially in θ=90°, fL2<0.6;α=1.03, α'=-172, fL2>0.6;α=0.46, α'=-3.17(2) The pressure head loss in three phase flow was well arranged by following empirical equation.Ø=β/λιγ Fγ mβ', Here, θ=50°; β=2.75, β'=-1.75, θ=70°; β=3.00, β'=-1.66However, the additional pressure head loss of solids in θ = 90° was almost neglegible, in the concentration range of this test.(3)The estimate equation for lifted solids was derived by momentum theory. Consequently, our experimental results which were already shown in the 1st and 2nd report satisfactorily agreed with the calculated values.