This thesis describes the development and implementation of the turbulent flow tube technique, a new method for studying gas phase reaction kinetics. The plausibility of the turbulent flow tube technique has been examined using a numerical model. Several experimental studies of key fluid dynamical processes have also been performed. These experiments include flow visualization of reactant mixin...

In this study, turbulent flow around a tube bundle in non-orthogonal grid is simulated using the Large Eddy Simulation (LES) technique and parallelization of fully coupled Navier – Stokes (NS) equations. To model the small eddies, the Smagorinsky and a mixed model was used. This model represents the effect of dissipation and the grid-scale and subgrid-scale interactions. The fully coupled NS eq...

A capillary tube is a common expansion device used in small sized refrigeration and air-conditioning systems. This paper present a numerical method used to calculate mass flow rate in a capillary tube. The proposed method solves the conservation laws (continuity, momentum and energy) in a 1D mesh. A iterative process is performed for a guessed value of the mass flow rate, and it is followed unt...

this paper presents a new model for predicting the compressive strength of steel-confined concrete on circular concrete filled steel tube (ccfst) stub columns under axial loading condition based on artificial neural networks (anns) by using a large wide of experimental investigations. the input parameters were selected based on past studies such as outer diameter of column, compressive strength...

The purpose of this work is to study the effect of oscillatory MHD blood flow in stenosed artery. The analytical and numerical results are obtained for oscillatory MHD blood flow, which is assumed to be a Newtonian fluid. It was also assumed that the surface roughness is of cosine shaped and the maximum height of roughness is negligible, compared with the radius of un-constricted tube. The flui...

The body’s control system is seen developing during the 4th week of embryonic life. The neural plate folds into a tube which detaches from the general ectoderm and creates the bodily control system as developed from the cells of the neural crest and tube.22,32,40,42 The neural crest cell derivaties are found throughout the body. Basically they gather information from the outer and inner aspects...

The deflection of a piezoelectric tube, with the outer (or inner) metal coating sectioned into four quadrants, is analyzed. We show that by applying a voltage V on one of the quadrants, the electromechanical deflection is ( Jzd,, VL2/?rDh), where d,, is the piezoel&tric coefficient, L is the length, D the diameter, and h the wall thickness of the tube. The deflections calculated with it agree w...