stability of thixotropic fluids in pipe flow

Linear stability of a thixotropic fluid obeying the moore model is investigated in pipe flow using a temporal stability analysis in which infinitesimallysmall perturbations, represented by normal modes, are superimposed on the base flow and their evolution in time is monitored in order to detect the onset of instability. an eigenvalue problem is obtained which is solved numerically using the pseudospectral chebyshev-based collocation method. the neutral instability curve is plotted as a function of the thixotropy number of the moore model. based on the results obtained in this work, it is concluded that the thixotropic behavior of the moore fluid has a destabilizing effect on pipe flow.