

January 25, 2023 at 7:17 amFAQParticipant
In multiphase flows simulations, the knowledge of the Interfacial area between the dispersed and the primary phase is crucial to determine the transfers such as the momentum transfer (through the drag), the mass transfer, the energy transfer and the species transfer. However, if we consider only one dispersed phase of spherical particles, the interfacial area is simply given by N*Pi*d^2 where d is the diameter of each particle and N is the number of particles. In this case, the value of d has to be chosen so that the transfer quantities are well computed. The choice of the Sauter diameter allows the user to define a single diameter representing the accurate interfacial area between the primary and the secondary phase. For example, knowing the local size distribution of spherical particles (based on its evaluation by a Population Balance Model for example), we can determine the total local interfacial area and the total local volume occupied by the particles. Therefore, the ratio between this volume and this interfacial area gives: V/S = (N*Pi * d^3 /6 ) / (N*Pi * d^2) = d/6 where d is the Sauter Diameter Finally using this local sauter diameter in the transport equation of the secondary phase will result in an accurate prediction of the transfer properties.

Introducing Ansys Electronics Desktop on Ansys Cloud
The Watch & Learn video article provides an overview of cloud computing from Electronics Desktop and details the product licenses and subscriptions to ANSYS Cloud Service that are...
How to Create a Reflector for a Center HighMounted Stop Lamp (CHMSL)
This video article demonstrates how to create a reflector for a center highmounted stop lamp. Optical Part design in Ansys SPEOS enables the design and validation of multiple...
Introducing the GEKO Turbulence Model in Ansys Fluent
The GEKO (GEneralized KOmega) turbulence model offers a flexible, robust, generalpurpose approach to RANS turbulence modeling. Introducing 2 videos: Part 1Â provides background information on the model and a...
Postprocessing on Ansys EnSight
This video demonstrates exporting data from Fluent in EnSight Case Gold format, and it reviews the basic postprocessing capabilities of EnSight.
 Solver message during DPM calculation: “number of stepsize underflows during particle integration step is x”. What does it mean and how to get rid of it?
 What is the difference between the VOF model and the Eulerian model?
 ANSYS Fluent: Efficient Modeling of Spray Breakup using VOFtoDPM Transition
 Mixing Tank Modeling in ANSYS Fluent
 ANSYS Fluent: Describing Cavitation in a Centrifugal Pump
 Hydrodynamics and Wave Impact Analysis
 Simulation of Exhaust Gas Recirculation (EGR) Cooler with CFD
 What is the superficial velocity in multiphase flows?
 Optimizing Solid Distribution in Continuous StirredTank Reactor
 ANSYS Fluent – Eulerian & Mixture Multiphase Models & Applications – Tips and Tricks
Â© 2024 Copyright ANSYS, Inc. All rights reserved.