Using confocal microscopy and first passage time analysis, we measure and predict the rates of formation and breakage of polymer-depletion-induced bonds between lock-and-key colloidal particles and find that an indirect route to bond formation is accessed at a rate comparable to that of the direct formation of these bonds. In the indirect route, the pocket of the lock particle is accessed by no...

Computer simulations of colloidal suspensions are discussed. The simulations are based on the Langevin equations, pairwise interaction between colloidal particles and take into account Brownian, hydrodynamic and colloidal forces. Comparison of two models, one taking into account inertial term in Langevin equation and another based on diffusional approximation proposed in [D.L. Ermak, J.A. McCam...

Accurate simulation and control of nanoparticle aggregation in chemical reactors requires that population balance equations be solved by using realistic expressions for aggregation and breakage rate kernels. Obtaining such expressions requires that atomistic simulation approaches that can account for microscopic details of particle collisions be used. In principle, molecular dynamics simulation...

LEE, SUNG WON. A Probability Model for Random Fiber Breakage. (Under the direction of JOHN WILLIAM BISHlR). Two fundamental questions in connection with the random breakage of fibers in a breakage system are set forth: Given a fiber group of any particular length, (1) What is the probability that a fiber of the length groups breaks at all? (2) What is the probability that a fiber breaks into s ...

Mathematical models of breakage processes are composed of partial integro-differential equations. For process optimisation and controller synthesis, a low-order model is preferred. A wavelet-based model reduction procedure is proposed. A multi-resolution (wavelet) approach is employed to achieve a set of high-order ordinary differential equations. A procedure which is motivated by the theory of...

Vertical roller mills (VRMs) are well-established grinding equipment for various tasks in the coal and cement industry. There are few studies on simulation of VRMs. In this research work, application of perfect mixing model for simulation of a VRM in a cement grinding plant was investigated. Two sampling surveys were carried out on the VRM circuit. The samples and data from the first survey wer...

The numerical analysis was used to predict the rockfill dam displacement, and model parameters were calibrated using triaxial experiments on scale-down samples. Due scale effect of material, displacements usually underestimated in design phase. This study focused material an extrapolation proposed extrapolate prototype modulus from laboratory modulus. By conducting confined compression experime...

Particle size reduction in spiral jet mills is induced by high velocity gas jets, causing interparticle and particle wall collisions leading to breakage. Despite extensive research on the design operational parameters, underlying mechanics of still poorly understood. Discrete Element Method Computational Fluid Dynamics are used here analyse fluid motions. A fast shearing dense bed formed wall, ...

Abstract In the development of ships, aspect collision safety plays a major role. this paper, approach to improve crashworthiness ships is fill already existing double hull with granular material. For purpose, material used be investigated numerically. A discrete element applied for in paper presented. Since breakage behavior particles particular interest, method together bonded particle method...