VISCOSITY OF CONCENTRATED POTATO-STARCH PASTES

A new viscosity equation for the description of the viscosity of conce ntrated aqueous starch pastes is proposed: eta(app) = Ke([Bmstarch+(C/ T)-DW+(n-1)ln gamma]) with: m(starch) = mass fraction starch in paste, T = temperature, W = amount of work performed on the starch, n = powe r-law index, K = 3.063 x 10(-4) Pas, B = 12.03 [-], C = 4.134 x 10(3) K-1, D = 2.83 x 10(-2) kg dry starch/kJ, and n = 0.494. The relation d escribes experimental results of viscosity measurements of potato star ch both in a Couette viscometer and in a static mixer for: 0.2 less th an or equal to m(starch) less than or equal to 0.35, 343 K less than o r equal to T less than or equal to 363 K, 3.3kJ/kg dry starch less tha n or equal to W less than or equal to 29.74 kJ/kg dry starch, and 2.71 s(-1) less than or equal to gamma less than or equal to 10.84 s(-1).