Chemical - Engineering

Computational fluid dynamics (CFD) simulation, deals with the solution of fluid dynamic equations on digital computers, requiring relatively few restrictive assumptions and thus giving a complete description of the hydrodynamics of bubble columns. This detailed predicted flow field gives an accurate insight to the fluid behaviors.3D simulation computational fluid dynamics (CFD) is applied using ANSYS-CFX Euler-Euler model to measure the hydrodynamic of an airlift reactor, and comparing with experimental data of Baten et. al., (1999).

        The prediction of accurate values of saturated enthalpy of vapor is very important in process design calculations and other industrial applications. Experimental measurements of saturated enthalpy of vapor are not easy to perform. So in order to obtain accurate saturated enthalpy of vapor, attention has been turned to calculate them using equations of state.

           Steganography is the art of information hiding in ways that prevent its detection. A message in cipher text may raise suspision, while an invisible message will not. Digital steganography uses a host data or message, known as a ''container'' or ''cover'' to hide another data or message called ''secret'' in it. An Image in audio steganography system had been proposed in this thesis in order to embed a secret image data in audio data.