【摘 要】
：
Jets of non-Newtonian liquids are present in many technical applications from agriculture over food processing to medical applications.We use our in-house multiphase Computational Fluid Dynamics code
【机 构】
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Institute of Aerospace Thermodynamics(ITLR)University of Stuttgart,Germany
【出 处】
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13th International Conference on Liquid Atomization and Spra
论文部分内容阅读
Jets of non-Newtonian liquids are present in many technical applications from agriculture over food processing to medical applications.We use our in-house multiphase Computational Fluid Dynamics code Free Surface 3D(FS3D)to perform incompressible direct numerical simulations of non-Newtonian liquid jets injected into air in the near nozzle region.FS3D uses the Volume of Fluid(VOF)method for interface tracking in combination with piecewise linear interface calculation(PLIC)to reconstruct the liquid interface.Different aqueous solutions of the polyacrylamide polymer Praestol are used as the injected shear-thinning fluids.The material properties are calculated from the Carreau-Yasuda model which is fitted to experimental data.We simulate different parameters which influence the stability of the jet such as the Reynolds number,the velocity profile of the injection representing different nozzle characteristics,ambient pressure,and the shear thinning behavior of the liquid by varying the concentration of Praestol in the solution.We calculate the expansion of the jet and the increase in surface area from the simulation data and we analyze the viscosity inside the liquid jet.Furthermore a quantitative analysis of the wave structures forming on the jet surface is performed in order to evaluate the influence of the different parameters.By this analysis we make a step towards predicting the droplet size distributions resulting from jet breakup,thus providing a way to increase the efficiency of the above mentioned processes.
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