Numerical experiment research on flow property of gelled propellants in pipe-bending pipe

To evaluate the influence of the various bend diameter ratio Rc/R and velocity on the flow property of gelled propellants in pipe-bending pipe,the 3D governing equations of the steady,incompressible,isothermal,laminar flow of a power-law,shear-thinning gel propellants in pipe-bending pipe were formulated,discretized and solved.A SIMPLEC numerical algorithm was applied for the solution of the flow field.Numerical investigation on a series of sharp 90°pipe-bending pipelines with nine kinds of bend diameter ratio and the inner diameters of 8 mm were conducted under the condition of seven Reynolds numbers.The pressure and velocity distributions were obtained.The empirical equation of local resistance coefficient for numerical experiments was conducted,providing the interrelations between the best bend diameter ratio and flow velocity in engineering design.The results indicate that the pressure and velocity distributions were non-linear,which became tremendous with increase of Reynolds numbers.The results suggest that the dot of maximum velocity occur at the wall outside of a bending pipe,which is nearer to the wall outside of a bending pipe along the flowing direction and increasing velocity.The phenomena of particle sedimentation should be taken into account to investigate the flowing behavior of gelled propellants in pipe-bending pipes under the condition of lower Reynolds numbers.