S. Majaniemi
Helsinki University of Technology
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Publication
Featured researches published by S. Majaniemi.
Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2000
Nikolas Provatas; Mikko Haataja; J. Asikainen; S. Majaniemi; Mikko J. Alava; Tapio Ala-Nissila
We review growth, percolation, and spatial correlations in deposition models of disordered fiber networks. We first consider 2D models with effective interactions between the deposited particles represented by simple parametrization. In particular, we discuss the case of single cluster growth, growth of uniformly random networks, and flocculated networks with nontrivial spatial correlations. We also consider a 3D deposition model of flexible fibers that describes the growth of multilayer structures of disordered networks. We discuss the statistical properties of such structures, transport of fluid through the network, and the asymptotics of growth in the limit of infinite thickness.
Journal of Chemical Physics | 2005
Kaifu Luo; M.-P. Kuittu; Chaohui Tong; S. Majaniemi; Tapio Ala-Nissila
We study the dynamics and equilibrium profile shapes of contact lines for wetting in the case of a spatially inhomogeneous solid wall with stripe defects. Using a phase-field model with conserved dynamics, we first numerically determine the contact line behavior in the case of a stripe defect of varying widths. For narrow defects, we find that the maximum distortion of the contact line and the healing length is related to the defect width, while for wide defects, it saturates to constant values. This behavior is in quantitative agreement with the experimental data. In addition, we examine the shape of the contact line between two stripe defects as a function of their separation. Using the phase-field model, we also analytically estimate the contact line configuration and find good qualitative agreement with the numerical results.
Physical Review E | 2006
T. Laurila; Chaohui Tong; S. Majaniemi; Tapio Ala-Nissila
We consider the influence of quenched noise upon interface dynamics in two-dimensional (2D) and 3D capillary rise with rough walls by using a phase-field approach, where the local conservation of mass in the bulk is explicitly included. In the 2D case, the disorder is assumed to be in the effective mobility coefficient, while in the 3D case we explicitly consider the influence of locally fluctuating geometry along a solid wall using a generalized curvilinear coordinate transformation. To obtain the equations of motion for meniscus and contact lines, we develop a systematic projection formalism that allows inclusion of disorder. Using this formalism, we derive linearized equations of motion for the meniscus and contact line variables, which become local in the Fourier space representation. These dispersion relations contain effective noise that is linearly proportional to the velocity. The deterministic parts of our dispersion relations agree with results obtained from other similar studies in the proper limits. However, the forms of the noise terms derived here are quantitatively different from the other studies.
Physical Review Letters | 2001
M. Dubé; Martin Rost; K. R. Elder; Mikko J. Alava; S. Majaniemi; Tapio Ala-Nissila
We argue that a proposed exponent identity [Phys. Rev. Lett 85, 1238 (2000)] for interface roughening in spontaneous imbibition is wrong. It rests on the assumption that the fluctuations are controlled by a single time scale, but liquid conservation imposes two distinct time scales.
Physical Review E | 2001
M. Dubé; S. Majaniemi; M. Rost; Mikko J. Alava; Ken Elder; Tapio Ala-Nissila
Physical Review E | 2002
J. Asikainen; S. Majaniemi; M. Dubé; Tapio Ala-Nissila
Archive | 2004
Tapio Ala-Nissila; S. Majaniemi; Ken Elder
European Physical Journal B | 2002
J. Asikainen; S. Majaniemi; M. Dubé; J. Heinonen; Tapio Ala-Nissila
TECHNISCHE MECHANIK | 2010
Timo Pitkänen; S. Majaniemi; Tapio Ala-Nissila
Archive | 2004
S. Majaniemi; T. Laurila; Chaohui Tong; Tapio Ala-Nissila