Dissertation/Thesis Abstract

Nozzle Flow Study and Geometry Optimization of Shear Thinning Non-Newtonian Fluid, Fuel Tank Sealant
by Kiani, Niloufar, M.S., California State University, Long Beach, 2018, 96; 10838460
Abstract (Summary)

Applications of sealant and adhesive technologies in aerospace industries require appropriate and reliable sealing materials and tools to provide suitable sealing. Due to a growing use of integral fuel tanks, which utilize the aircraft structure for fuel containment, this study focuses on nozzle geometry optimization of aircraft fuel tank sealant in order to develop and facilitate sealant approval process and to ensure the implementation of suitable fuel tank sealing.

Computational Fluid Dynamics (CFD) analyses were performed to study the sealant flow characterization and behavior using Star-CCM+ software. An empirical model was developed by the aid of Design of Experiments (DOE) techniques in order to develop a reliable mathematical model based on the collected data from numerical results. Scanning Electron Microscopy (SEM) was utilized to investigate the fracture/deformation of hollow glass microballoons and entrapped air bubbles within the cured sealant.

The results of this research concluded that the bent in nozzle geometry increases the sealant pressure drop throughout the nozzle. There is an optimized value for travel distance and cross sectional dimension and geometrical shape within the nozzle geometry that minimizes overall dynamic viscosity of the sealant.

Indexing (document details)
Advisor: Yoozbashizadeh, Mahdi, Rahai, Hamid
Commitee: Yavari, Parviz
School: California State University, Long Beach
Department: Mechanical and Aerospace Engineering
School Location: United States -- California
Source: MAI 58/02M(E), Masters Abstracts International
Source Type: DISSERTATION
Subjects: Engineering, Aerospace engineering, Mechanical engineering
Keywords: Aerospace application, Design of experiments, Generalized Newtonian Carreau-Yasuda model, Geometry optimization, Non-Newtonian shear thinning sealant, Star-CCM+ software
Publication Number: 10838460
ISBN: 9780438464827
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