Browsing Faculty of Engineering & Applied Science by Author "Mohany, Atef"
Now showing items 1-18 of 18
-
The aeroacoustics response and shear layer dynamics of confined cavities subject to low Mach number turbulent flow
Hanna, Marc (2023-04-01)Cavities exposed to low Mach number flow in various engineering applications are often liable for generating flow-excited acoustic oscillations, resulting in large acoustic amplitudes and vibrations. This compromises the ... -
Control of resonant excitation in piping systems
Lato, Thomas; Mohany, Atef (9th International Symposium on Fluid-Structure Interactions, Flow-Sound Interactions, Flow-Induced Vibration & Noise, 2018)Acoustic resonance is a phenomenon which is known to have severe repercussions in a variety of industrial systems. Acoustic resonance can cause high levels of vibrations leading to damage or premature failure of critical ... -
Damping acoustic pressure pulsations in pipelines using Helmholtz resonators
Sachedina, Karim (2019-05-01)In industrial piping systems, centrifugal and reciprocating turbomachinery generate acoustic pressure pulsations, which propagate into the pipeline and interact with piping components, potentially causing vibrations, ... -
Development of polymer based nanocomposite using electrospinning for sound absorption and isolation
Elkasaby, Mohamed Ali (2017-01-01)Excessive noise has adverse effects on human health. Therefore, it is necessary to find innovative methods for decreasing the exposure to noise in the environment. Various materials are used for dampening noise. In order ... -
Development of thermoplastic foams with heterogeneous cellular structures for acoustic applications
Naeem, Ibrahim Samir Saad (2016-08-01)Manufacture of heterogeneous thermoplastic foams is of great interest to damp low frequency noise in transportation and building industries. Most of the fabrication methods reported either use cumbersome batch processes ... -
Effect of diameter ratios on the flow-sound interaction of the straight circular finned cylinders
Islam, Md Rashidul (2020-01-01)Finned tubes that are widely used in heat exchangers could be susceptible to the flow-excited acoustic resonance that generates intense pressure fluctuations, which may lead to premature fatigue failure of the tubes. This ... -
Effect of self-excited acoustic perturbations on flow characteristics around rectangular cylinders with varied geometrical aspects
Shoukry, Ahmed (2023-08-01)This study explores the effects of aspect ratio, edge geometry and incidence angles on the dynamic lift force, wake behaviors, and the susceptibility of such geometrical aspects to self-excited acoustic resonance in ... -
Effects of the geometric modifications on the shear layer excitation source in co-axial side branches
Hammad, Omar S. (2023-08-01)This comprehensive study delves into the interaction between shear layer oscillations and the acoustic field within co-axial cavities, spotlighting the efficacy of the sound source model as a reliable semi-empirical modeling ... -
Experimental and numerical investigation of the dynamic seat comfort in aircrafts.
Ciloglu, Hakan (2013-12-01)This research focuses on the dynamic seat comfort in aircrafts specifically during takeoff, landing and cruise through turbulence flight conditions. The experiments are performed using a multi axis shaker table in the ... -
Flow characteristics and acoustic resonance excitation of finned cylinders in cross-flow
Alziadeh, Mohammed (2022-12-01)The flow characteristics and acoustic resonance excitation of bare and finned cylinders of different arrangements in cross-flow were experimentally investigated. In the design phase of finned tube heat exchangers, finned ... -
Flow-sound interaction mechanism of a single finned cylinder in cross-flow
Arafa, Nadim (2017-04-01)The flow-sound interaction mechanism of a single finned cylinder in cross-flow is experimentally investigated and compared to that resulting from an equivalent bare cylinder. The flow field changes that result from the ... -
Flow-sound interaction mechanism of a single spirally finned cylinder in cross-flow
Alziadeh, Mohammed (2017-01-01)Over the years, some effort has been expended in the improvement of heat transfer performance in tubular heat exchangers. This can be achieved by adding different types of fins to the outer tube surface, effectively ... -
Investigation of the ultrasonic based hydrogen production process: Sonohydrogen
Seifeldin, Sherif Samir Ahmed Rashwan (2021-04-01)The present work carries out various sets of numerical investigations to link the primary effect of the acoustic parameters with the secondary effect of developing a chemical reaction mechanism for water vapor dissociation ... -
Modeling and analysis of metal cutting process using self-propelled rotary tools
Ahmed, Waleed A. Abdelfattah (2021-02-01)Machining difficult-to-cut materials is still one of the challenges facing different industries such as aerospace, nuclear and automotive sectors. That’s mainly because of the excessive heat generated, which affects the ... -
Numerical investigation of the fluidelastic instability of two-phase flow in a parallel triangular tube array
Sadek, Omar (2021-05-01)Steam generators are always susceptible to vibrations induced by the flow in either the shell or tube sides. The fluidelastic instability phenomenon (FEI) is considered one of the most devastating flow excitations since ... -
Parametric investigation of flow-sound interaction mechanism of circular cylinders in cross-flow
Afifi, Omar (2016-12-01)Flow-excited acoustic resonance in heat exchangers has been an ongoing issue for the past century. The main challenge in this issue, is in the actual prediction of the resonance occurrence. This is due to the complexity ... -
Passive damping mechanism of Herschel-Quincke tubes for pressure pulsations in piping systems
Lato, Thomas (2018-12-01)The acoustic pressure pulsations in industrial piping systems can induce fluctuating loads on inline equipment which may cause fatigue failure and in severe cases, initiate a phenomenon known as acoustic resonance. Passive ... -
Passive methods for suppressing acoustic resonance excitation in shallow rectangular cavities.
Omer, Ahmed (2014-08-01)The flow-excited acoustic resonance in shallow rectangular cavities can be a source of severe noise and/or excessive vibration. This phenomenon is excited when one of the acoustic modes in the accommodating enclosure is ...