Mixer- settlers are widely used for solvent extraction process in industry. The aims of this project are SIMULATION of FLUID FLOW and optimizing the operational conditions of settler in solvent extraction process. Designing and meshing of settler geometry is done by Gambit software. Then, in order to simulate the FLUID FLOW, the meshed designed imported to Ansys Fluent software. SIMULATION results were verified before SIMULATION. Effect of Inlet volumetric on phase separation investigated. The effect of geometry of picket fences was investigated by the presence of cubic, cylindrical picket fences, picket fences with 5 corner cross section and half cylindrical picket fences. A few extra plates of picket fences were located near the entrance of settler. Phase separation in presence of two and three rows of picket fences investigated. Results indicate that by reducing the inlet volumetric rate, increasing the number of rows, putting extra plates of picket fences in front of entrance and decreasing the closed to open surface ratio to 2, separation improves.

In the present study, commonly used weakly compressible lattice Boltzmann method and Guo incompressible lattice Boltzmann method have been used to simulate FLUID FLOW in a stirred tank. For this purpose a 3D Parallel code has been developed in the framework of the lattice Boltzmann method. This program has been used for SIMULATION of FLOW at different geometries such as 2D channel FLOW and 3D stirred tank FLOW. It has been shown that in addition to elimination of compressibility error, the Guo incompressible method eliminates mass leakage error from the FLUID FLOW SIMULATIONs although its implementation is as easy as the weakly compressible Lattice Boltzmann method. For example in presented stirred tank problem mass leakage in Guo method is about 0% while for LBGK method is about 1.4%. By the way, comparison between results of the two methods shows that differences in local FLOW quantities are negligible in both methods; however, for overall FLOW quantities, the results of Guo incompressible method are more accurate than those of weakly compressible method.

Blood is one of the vital FLUIDs of the human body. Measurement of its viscosity and other properties is very important in detecting and understanding different cardiovascular diseases. In this study, the blood FLOW in a concentric cylinder viscometer was simulated numerically. The blood FLOW patterns were analyzed by applying different rotational speed of inner cylinder. Creation of a Couette FLOW, end effects and suitable rotational speed limit were analyzed. The amount of the torque applied to the inner cylinder which prevents the generation of the Taylor vortices was also predicted. From the obtained results, one can conclude that these vortices were not as important as the end effects were. In order to keep the blood sample temperature within a constant and acceptable range a thermal bath was used. Heat removal rate with different inFLOW rates of coolant was also predicted numerically.

Hydrocyclones are the most efficient used classifiers in the grinding circuits. Hydrocyclones are normally modeled and simulated using empirical models. These models can only be used within the range of the experimental data from which the model parameters have been derived. Computational FLUID dynamics (CFD) is a powerful tool in simulating FLUID FLOW in hydrocyclones. This research work deals with 3D SIMULATION and modeling of FLUID FLOW in a single phase hydrocyclone using CFD. The main SIMULATION steps include preparing the geometry, meshing it, defining the properties of the materials involved, and setting the boundary layer and conditions. The experimenal data measured in a laboratory hydrocyclone were used for validation of the model. The SIMULATION results indicated that the tangential velocity increased traversing towards the core, before decreasing at the interface with the air core. The liquid axial velocity inside the hydrocyclone varied from-1. 59 m/s to 6. 52 m/s. The axial velocity is a result of two swirling FLOWs, the inner upward FLOWing inside the air core and the outer downward FLOWing near the cyclone wall. The liquid axial velocity inside the hydrocyclone varied from-5. 58 m/s to 5. 46 m/s. The LES model showed the least error on predicting the velocity profiles, the air core dimensions (7. 8%), the pressure drop (7. 52%) and the mass split ratio to overFLOW (0. 18%). The effect of various geometric (spigot diameter, vortex diameter and cone angle) and process (feed FLOW rate) parameters on tangential velocity of the FLUID was investigated.

The biomimetic and hydrodynamic study of aquatic animals is one of the most challenging computational FLUID dynamics topics in recent studies due to the complexity of body geometry and the type of FLOW field. The movement of the aquatic body, and particularly the tail section and the corresponding movement of FLUID around the body, causes an unsteady FLOW and requires a comprehensive study of the interaction of FLUID and aquatic body which makes the analysis more complicated. In this research, the main purpose is to investigate the numerical SIMULATION of hydrodynamic FLOW around the aquatic body regarding dolphin swimming condition. Specifically, considering the precise 2D geometry of a dolphin body, the studied parameters include the drag and lift coefficients, body movement and its effect on vorticity, pressure and velocity fields immediately around the body. According to the results it can be claimed that the body movement frequency and the length of tail motion highly affect the mentioned parameters.

force convection heat transfer of turbulent nano FLUID FLOW in 90 and 60 degree elbow is simulated by using FLUENT. Single phase model has been implemented to study such a FLOW field and standard k-e model is employed. The considered nanoFLUIDs are mixtures of Al2O3 nanoparticles and water as the base FLUID. SIMULATION effect of Reynolds number and nano concentration on Nusselt number and friction coefficient have been presented and discussed. The computed results are compared with previously published data for a base FLUID (0% nano concentration) and good agreement between the results is observed. It is seen that by increasing Reynolds number and nano concentration, heat transfer increase and friction coefficient decrease. Heat transfer in 90 and 60 degree elbow is compared and result shows by increasing the angle, heat transfer will decrease.