Saudi Cultural Missions Theses & Dissertations
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Item Restricted Computational Fluid Dynamics study of fixed bed adsorbers informed by 3D X-ray Computed Tomography(Saudi Digital Library, 2025) Alalwyat, Ahmed; Ronny, PiniA resolved 3D CFD transient multi-component solver was created, solving the 3D Navier-Stokes equations for the fluid phase and containing adsorption physics as boundary conditions within the surface of spherical particles. The geometry was reconstructed by X-ray computed tomography to be a 3D spherically packed bed and reduced to a packed cube with 11 mm long sides for a more reasonable computational cost. The mesh was created by background meshing initially with (64, 64, 60) cells in the 𝑥, 𝑦 and 𝑧 directions, respectively. The mesh of spherical particles was removed to retain the fluid mesh only and implement extra refinement levels around the spherical particles. Further smoothness was applied at the edges of the packed cube and at the distorted cells due to the imperfect removal of the mesh of the spherical particles. The steady-steady solver was used to generate a maximum air velocity magnitude of 4.5 mm/s. The transient solver was used to generate CO2 mass composition maps depicting how CO2 flow replaces N2 gradually in porous media. The adsorption physics was implemented based on Henry’s and dual-site Langmuir’s equilibrium isotherms. A linear relationship between the rate of CO2 loading was confirmed for the Henry’s isotherm, while non-linear adsorption/desorption behaviour was noticed for the dual-site Langmuir’s equilibrium isotherms. The transient simulation with the dual-site Langmuir’s equilibrium implementation was computationally convergent by a grid convergence index study and validated to have 3% error from the analytical solution.10 0Item Restricted Fire Performance Of Façade Materials In Saudi High-Rise Buildings: Implications For Civil Defence And Code Compliance.(Saudi Digital Library, 2025) Alzahrani, Rakan Rezgallah; Nadjai, AliAluminium Composite Panel (ACP) façade materials have been implicated in several catastrophic building fires worldwide, raising urgent concerns about their fire performance. The rapid vertical spread of fire, high heat release, and toxic smoke generation associated with certain ACP systems have led to significant casualties and property loss, prompting global scrutiny and regulatory reforms. These developments are particularly relevant for Saudi Arabia due to the intensive solar radiation and high temperatures experienced in the country. In that regard, this study aimed to comprehensively assess the fire performance of cladding materials used in high-rise buildings in Saudi Arabia (particularly Aluminium Composite Panels ACPs) through code compliance checks, experimental testing, and simulation analysis, to enhance building safety and Civil Defence preparedness. Three samples of composite materials were collected from different regions in Saudi Arabia. Bomb Calorimetry, Thermogravimetric Analysis (TGA), and Fourier Transform Infrared Spectroscopy (FTIR), together with Computational Fluid Dynamics (CFD) simulations using Fire Dynamics Simulator (FDS) and the Ozone model were utilised to gain insights into fire behaviour, thermal characteristics and fire performance of the composite materials. The results showed that while composite materials in Saudi Arabia could potentially meet the EN13501 -1 for class A1 and A2, there are specific risk factors within the ACP components that might enhance fire growth and smoke production levels. One sample in particularly was found to be high risk, having weak retardant properties and an exceptionally high mass loss percentage of 76% for the core. In view of such finding, there is a need to reassess façade composite materials and perform full scale tests.19 0