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Öğe Modeling of drop coalescence in isotropic turbulent flow(Taylor & Francis Inc, 2006) Kelbaliyev, G; Sarimeseli, ACoalescence of drops in fully developed turbulent flow depends on the size of drops and the properties of the flow. By comparing the size of drops with the Kolmogoroff length scale, collision frequencies of drops have been determined. If lambda > lambda(0), then the collision frequency of drops in a gaseous medium is given as omega(c) similar to (epsilon(R)/a(2))(1/3) and for lambda > lambda(0), it is given as omega(c) similar to (epsilon(R)/nu(c))(1/2) in a liquid medium. New expressions for the fluctuation, thinning, and breaking of the intervening film between drops that is formed due to collisions were also suggested. At various Re and Mo numbers, for the calculation of maximum stable sizes of drops, some equations are suggested. In order to evaluate coalescence and break up rates a new dimensionless number, Ke = eta(c)epsilon(R)/g sigma, is introduced. This number is defined as the ratio of the energy of the turbulent flow to surface energy. As a result of the coalescence of drops, evolution of the distribution function with time is determined from the solution of the Focker-Planck equation. Comparisons of the calculated drop sizes with the experimental data reported in literature showed good agreement.Öğe Modeling of the break-up of deformable particles in developed turbulent flow(Pergamon-Elsevier Science Ltd, 2004) Sarimeseli, A; Kelbaliyev, GDynamic behavior of the drops and bubbles in developed turbulent flow depend on turbulent length scale (gimel), Morton (Mo), Weber (We) and Reynolds (Re-a) numbers. In the present work, in order to calculate the maximum stable size of drops and bubbles, the A factor of break-up, Ay (Ay = omegaa/U), that is the ratio of the break-up rate in developed turbulent flow to the mean velocity of the flow has been introduced and the effect of the pipe roughness on this factor has also been given. Comparison of all the results obtained in this study with those taken from the literature for the range of Mo less than or equal to 7, We less than or equal to 10 and Re-u less than or equal to 100 showed a good agreement. (C) 2004 Elsevier Ltd. All rights reserved.Öğe Rheological properties of asphalt-plastic blends(Marcel Dekker Inc, 2003) Colak, Y; Pehlivan, D; Sarimeseli, A; Kelbaliyev, GIn this article, the flow type of two different asphalt-plastic blends has been determined. One of these blends was prepared from the mixture of asphalt-cement that has a penetration degree of 60-70 (AC60-70) and low-density polyethylene (LDPE), and the other was prepared from the mixture of asphalt-cement that has a penetration degree of 150-200 (AC150-200) and low-density polyethylene (LDPE). Also, a model of the variation of the blend viscosity with temperature and concentration has been developed. It was found that this model is in a good agreement with the experimental data obtained and the relative error is calculated as 10-15%.Öğe Sedimentation of particles in developed turbulent flow in rough pipes(Elsevier Science Sa, 2002) Sarimeseli, ASedimentation of particles on a pipe wall in developed turbulent flow is a rather common phenomenon in industrial processes. Various experimental investigations showed that the sedimentation velocity of particles is greatly affected by the roughness height and the friction factor. In this article, new expressions to calculate the friction factor and the sedimentation velocity of the particles in turbulent flow in rough pipes are suggested for the range of the Reynolds number, 10(4) less than or equal to Re less than or equal to 10(7) and the range of the dimensionless relaxation time, 10(-1) less than or equal to tau(+) less than or equal to 10(2), respectively. Comparisons of the suggested equations in this work with the published experimental data from the literature show good agreement. (C) 2002 Elsevier Science B.V. All fights reserved.Öğe Sedimentation of solid particles in turbulent flow in horizontal channels(Elsevier Science Sa, 2004) Sarimeseli, A; Kelbaliyev, GSedimentation of particles in horizontal channels in turbulent flow is commonly encountered in industrial processes. Investigations showed that the sedimentation velocity of particles in horizontal channels is nonsymmetrical along the cross-section of channels due to gravity. In this work, new expressions for the calculation of the sedimentation velocity of particles and the thickness of the sediment layer at the bottom of a horizontal channel are suggested. The entrainment and the transport rates of the particles from the sediment layer are also determined, and it was found that the entrainment rate is proportional to the square power of the friction velocity and inversely proportional to the viscosity of the flow. Comparisons of the suggested equations in this work with published data from the literature showed good agreement. (C) 2004 Elsevier B.V. All rights reserved.
