分散体の流動に関する二, 三の考察
1967 年 16 巻 166 号 p. 456-459
詳細
1967 年 16 巻 166 号 p. 456-459
Flow curves of disperse systems were determined in the wide range of shearing rates as illustrated in Figs. 2, and 3. Silica gel-water, clay-water, and zinc oxide-water systems containing its own deflocculating agents respectively, were shown as examples for the suspension, and benzene-water and nitrobenzene systems having stabilizing additives for the emulsion.
All the flow curves were recognized as the so-called Ostwald's flow pattern. The analysis was performed using Eyring's equation (1), Cross's equation (4) and Casson's equation (5), and the following conclusions were derived;
(1) Eyring's equation is valid in the whole range only in the case of silica gel-water system having 2% solid content.
(2) The n-value in the Cross's theory is recognized to show the width of the range of shear rate within which structual break-down is completed and α-value indicates the initiation of break-down of agglomelating structure.
(3) Casson's plots are employed to decide the existence of yield value, but no yielding characters are proved in all cases as illustrated in Figs. 6∼9.
