In the bubble column reactor, the liquid phase is stationary and gas flow rate in it is varied. The numerical study of splitting of bubble into two bubbles of nearly equal size is considered. The phase fraction in physical quantities that can be used to distinguish the distribution of gas hold up in a bubble Column reactor. VOF is based on a surface tracking technique applied to a fixed Eulerian space.
ANSYS FLUENT SOFTWARE
In present work CFD simulations are carried out using ANSYS FLUENT software using Volume of Fluids (VOF) method. Image processing technique was used to identify bubble size and bubble velocity. In Part I of this work, artificial splitting of bubble in a bubble column rector is experimentally studied by using a high speed camera. However hot spots are identified in the case of sideward facing fins which will affect the heat transfer characteristics when compared to upward facing hollow cylindrical pin fins.Ībstract: The present work deals with the use of CFD analysis and the validation of the experimental work carried out on the artificial splitting of an air bubble in a bubble column reactor. The results show that the sideward fins have lower base plate temperature as expected due to buoyancy effects. The parameters varied are the internal diameter of the fins and the heat laod. The fin outer diameter (12mm) and fin height (50mm) are kept constant.
ANSYS FLUENT CODE
The model is numerically investigated using commercial CFD code ANSYS FLUENT©. In the present study a comparative analysis is made between an array of hollow pin fins in upward facing and sideward facing arrangement under natural convection. The addition of fin increases the surface area and this forms an economical solution for increasing the efficiency and the performance of the device. Fins are extended surface which are used to enhance heat transfer rate from a surface by increasing the area exposed to convection. The authors will share the advantages that may be obtained by using ANSYS BladeGen compared with the use of general CAD Systems.Ībstract: In most of the engineering applications unnecessary heat is produced.
Hydraulic efficiency of the runner is calculated utilizing Turbo Topology module in ANSYS Fluent. CFD simulation is done using the ANSYS Fluent with pressure inlet and pressure outlet boundary conditions and k-ε turbulence model.
Grid is generated in ANSYS TurboGrid utilizing ATM Optimized topology. Implementation phase describes operations necessary in creating a propeller runner model in ANSYS BladeGen which consist of importing rtzt file, modifying the trailing edge properties and altering profile thickness distribution to that of 4 digits NACA airfoil standard. The profile in rtzt file has a certain fix thickness which has to be altered later.
ANSYS FLUENT HOW TO
Preparation phase illustrates how to develop stream surfaces and passages, how to create and transform meanline and how to create an rtzt file. Modeling process is divided into preparation and implementation phase. Abstract: This paper aims to demonstrate how to model, mesh and simulate a hydraulic propeller turbine runner based on the geometrical specification of the runner blade.