Maziar Arjomandi

Maziar Arjomandi
University of Adelaide · School of Mechanical Engineering

PhD in Aerospace Engineering

About

244
Publications
97,113
Reads
How we measure 'reads'
A 'read' is counted each time someone views a publication summary (such as the title, abstract, and list of authors), clicks on a figure, or views or downloads the full-text. Learn more
4,266
Citations

Publications

Publications (244)
Article
The wind energy industry is moving to offshore installations allowing for larger wind turbines to be deployed in deep-water regions with higher and steadier wind speeds. Floating offshore wind turbines consist of two main subsystems: a wind turbine itself and a floating substructure that supports it and provides stability. While the wind turbine te...
Article
This study examines the effectiveness of mesh grids in heliostat field perimeter fences and edge-mounted devices for heliostat wind load reduction. Two experimental studies were conducted: (1) the effect of mesh porosity and non-dimensional longitudinal distance of a perimeter fence upstream on the forces on a heliostat, and (2) the effect of mesh...
Article
Full-text available
In this paper, the effect of the turbulence and swirling of the inlet flow and the diameter of the nozzle on the flow characteristics and the particles' transport/deposition patterns in a realistic combination of the nasal cavity (NC) and the maxillary sinus (MS) were examined. A computational fluid dynamics (CFD) model was developed in ANSYS® Flue...
Article
Multi-mode Wave Energy Converters (WECs) are designed to harvest energy simultaneously from multiple hydrodynamic modes, thereby maximising power absorption. The behaviour of each mode must be carefully considered, given that hydrodynamic and geometric coupling between modes can lead to severe reductions in power if improperly designed. This study...
Article
This study investigates the potential of finite-length porous surfaces with a subsurface chamber for the control of the turbulent boundary layer. The effect of the subsurface chamber on the boundary layer is investigated by hot-wire anemometry measurements of the boundary layer response to different chamber configurations. Three different chamber c...
Article
A new analytical model of a free-falling curtain of heavier-than-fluid particles from a wedge-shaped hopper in a quiescent medium is presented and used to determine the key underlying–non-dimensional parameters that control its dispersion. The model calculates the particle velocity and the volumetric flow rate of the induced air into the particle s...
Article
Full-text available
The micro-cavity array is a unique surface geometry which aims to passively dampen the total energy of coherent motions within the near-wall region of a turbulent boundary layer. Previous works have shown the effectiveness of this device, in particular the reduction of sweep and turbulence intensities by 13% and 14%, respectively. Preliminary param...
Article
Full-text available
In the present article, the heat transfer and fluid flow of the air in a compact microchannel gas heater (MCGH) was experimentally quantified. To understand the effect of heat flux value (HFV), and inlet velocity on the heat transfer coefficient (HTC), wall temperature, friction factor, Nusselt number, average pressure-drop value (PDV) and performa...
Article
Multi-mode Wave Energy Converters (WECs) are able to harvest energy from multiple Degrees-of-Freedom (DOFs) simultaneously, which increases the power that can be absorbed from the incident wave compared to single-DOF WECs. However, nonlinear coupling between hydrodynamic modes, which occurs when the WEC oscillates simultaneously in multiple directi...
Conference Paper
Full-text available
In this paper, the effects of a micro-cavity array on burst events at both small scales and large scales were investigated. Small-and large-scale turbulent structures were calculated from the streamwise velocities which were measured by a TSI hot-wire anemometry system in a closed-loop wind tunnel at the University of Adelaide. The characteristics...
Article
In this study, the effect of the shape of the stenosis on the flow transition in an artery is investigated. Different shapes of the stenosis including round, oval, elongated, half-moon, bean-shape, and crescent with and without eccentricity at a constant degree of stenosis (73%) are studied. A computational model, validated against the in-house Par...
Article
Temporal variations of the coronary arteries during a cardiac cycle are defined as the superposition of the changes in the position, curvature, and torsion of the coronary artery axis markers and the variations in the lumen cross-sectional shape due to the distensible wall motion induced by the pulse pressure and contraction of the myocardium in a...
Article
Coherent structures in a turbulent boundary layer have been shown to have an influence on the skin-friction drag acting on surfaces beneath the boundary layer. The use of micro-cavities on a flat surface has recently shown the potential to passively control a turbulent boundary layer by attenuating the sweep events. Previous experiments have determ...
Article
Accurate estimation of the static and dynamic wind loads on heliostats based on detailed measurement and characterisation of turbulence is crucial to avoid structural failure and reduce the cost of the structural heliostat components. Wind load predictions for heliostats are not specified in design standards for buildings because of a heliostat’s n...
Article
Acoustic drug delivery (ADD) is an innovative method for drug delivery to the nose and paranasal sinuses and can be used to treat chronic rhinosinusitis (CRS). The underlying mechanism of ADD is based on the oscillatory exchange of air between the nasal cavity (NC) and the maxillary sinus (MS) through the ostium, which assists with the transfer of...
Article
Full-text available
Understanding the effects of a stent design on the flow behaviour especially near the artery wall can lead to choosing or designing more haemodynamically compatible stents that can reduce the chances of restenosis inside the stented arteries. In this study, a novel technique is presented for the visualisation of the entire flow and the investigatio...
Article
Understanding the effect of artery curvature on the pressure drop inside the arteries is of great importance due to the existence of several curved portions inside the coronary arterial system. In this paper, an experimental model is developed to account for the effect of the curvature of the coronary arteries on the pressure drop and Fractional Fl...
Article
Full-text available
Manipulation of turbulence within an atmospheric boundary layer flow by application of woven wire mesh fences is investigated. Turbulence properties behind fences of different porosities and mesh opening widths were determined from velocity measurements in a wind tunnel. It is found that with the application of a fence with a porosity of 0.46, the...
Conference Paper
The turbulence intensities and shear stresses in a turbulent boundary layer (TBL) are primarily associated with the presence of coherent structures, such as sweep and ejection events. Recent experiments using a passive method of controlling the TBL using micro-cavities have reported a reduction in the coherent structures by ∼ 7%. However, the mecha...
Conference Paper
The aerodynamic loads on heliostats have been investigated through an extensive range of experimental studies at the University of Adelaide in association with the Australian Solar Thermal Research Institute (ASTRI). Applied modelling techniques using spires and roughness elements were adopted for generation and characterisation of the temporal and...
Article
Multi-mode wave energy converters are able to generate power from multiple degrees-of-freedom, typically delivering increased power absorption from ocean waves compared to devices operating in heave or surge only. However, the control of such systems is complex due to strong coupling between different degrees-of-freedom. This study aims to understa...
Conference Paper
Full-text available
Multi-mode wave energy converters can generate power from multiple degrees-of-freedom, allowing them to harvest more energy than a converter operating in heave only. However, the control of these devices is complicated due to strong hydrodynamic coupling between the various degrees-of-freedom. This study attempts to provide a better understanding o...
Article
Bladed receivers have been proposed as an alternative to conventional external receivers for high-temperature concentrating solar power systems. Instead of flat banks of tubes arranged on the receiver surface, the tube-banks are oriented into the form of blades protruding from the back-wall of the receiver. This modified arrangement improves light-...
Conference Paper
Full-text available
This study aims to investigate the resonance frequency of the human maxillary sinus for the application of acoustically-driven drug delivery. An improved model of the classic Helmholtz resonator formula has been developed to predict the resonance frequency of a nasal cavity and maxillary sinus combination, using computational fluid dynamics (CFD)....
Article
This paper investigated the influence of the turbulent wind fluctuations in the lowest 10 m of the atmospheric boundary layer (ABL), depending on the surface roughness of the terrain surrounding a heliostat field, on the required dimensions and material cost of the structural heliostat components to resist the combined bending and torsional stresse...
Article
Full-text available
Aortic valve stenosis is one of the most prevalent cardiovascular disease among adults worldwide. Stenosis of the aortic valve changes the hemodynamic parameters inside the aortic root which perpetuates aortic valve calcification and has been associated with the development of coronary artery atherosclerosis. Invasive studies have revealed that the...
Article
Full-text available
Background and objective Coronary artery diseases and aortic valve stenosis are two of the main causes of mortality and morbidity worldwide. Stenosis of the aortic valve develops due to calcium deposition on the aortic valve leaflets during the cardiac cycle. Clinical investigations have demonstrated that aortic valve sclerosis not only affects hem...
Article
A thermodynamic model was developed to assess the energetic performance of a dual receiver concentrated photovoltaic/thermal plant for the co-production of steam, electricity and hot water/air. The system utilizes a dual receiver including a steam generator based on a solar receiver and a concentrated PV/thermal receiver. The system is regulated so...
Conference Paper
Full-text available
The vortex shedding tone magnitude of a cylinder in uniform flow can be suppressed by applying a porous coating. The mechanism for the vortex shedding tone suppression is not fully understood, nor is the optimal porous coating to achieve maximum tone suppression. Understanding the internal flow field of Porous Coated Cylinder (PCC) can provide a de...
Article
Full-text available
The turbulence in the blood flow, caused by plaque deposition on the arterial wall, increases by the combined effect of the complex plaque geometries and the pulsatile blood flow. The correlation between the plaque geometry, the pulsatile inlet flow and the induced turbulence in a constricted artery is investigated in this study. Pressure drop, flo...
Article
Full-text available
This paper investigates the effect of aero-acoustic parameters on the efficiency of acoustically-driven drug delivery (ADD) to human maxillary sinus (MS). To be more specific, the effect of the frequency, amplitude at the acoustic excitation, and the inlet mean flow rate on the efficiency of ADD to the MS is studied. Direct computational aero-acous...
Article
Full-text available
Acoustically driven nebulized drug delivery (acoustic aerosol delivery) is the most efficient noninvasive technique for drug delivery to maxillary sinuses (MS). This method is based on the oscillation of the air plug inside the ostium to transport drug particles from the nasal cavity (NC) to the MS. The larger the wavelength of the air plug oscilla...
Article
The mean and spectral characteristics of turbulence in the wake flow of a flat plate model resembling a heliostat in the atmospheric boundary layer flow are investigated in a wind tunnel experiment. Mean velocity and turbulence kinetic energy were characterized in the wake of a heliostat model at three elevation angles up to a distance of eight tim...
Article
Full-text available
A series of tests was conducted to unlock the potential application of MgO/water-EG (ethylene glycol) nanofluids (NF) in a double-pipe heat exchanger (HEX). The overall heat transfer coefficient (HTC), the inlet temperature of the working fluid, the fluid pressure drop (FPD), friction factor (FF) and the hydraulic performance index of the NF within...
Article
The total heat transfer from a finned or 'bladed' structure may be expected to rise from that of a flat geometry due to a larger area exposed to ambient air. However, this is not always the case because a trade-off can be found between convection and radiation as the bladed geometry and surface temperature are varied. Furthermore, a mixed convectio...
Article
Non-invasive measurement of pressure drop has great clinical significance for the treatment of coronary artery diseases. The objective of this study is to develop a relationship that can estimate pressure drop in a stenosed coronary artery model as a function of different parameters such as blood viscosity, artery length and diameter, flow rate and...
Article
In this paper, we quantified the heat transfer coefficient (HTC) of Fe3O4 aqueous nano-suspension at various mass concentrations of 0.05% 0.2%. The potential role of operating parameters including heat flux perpendicular to the surface (HF), concentration of the nanoparticle (NP), strength of magnetic field (MF), zeta potential and concentration of...
Article
In the present work, the chemical performance of a new catalyst mediated inside a micro-reactor for hydrogen production was experimentally assessed. The coated catalyst was prepared via particulate fouling technique by uniformly dispersing copper nano-flakes on silica as a conductive substrate. The catalyst was calcinated at 973 K to further streng...
Conference Paper
Full-text available
The aerodynamic loads on heliostats have been investigated through an extensive range of experimental studies at the University of Adelaide in association with the Australian Solar Thermal Research Institute (ASTRI). Applied modelling techniques using spires and roughness elements were adopted for generation and characterisation of the temporal and...
Article
Non-uniform pressure distributions on the heliostat surface due to turbulence in the atmospheric boundary layer (ABL) have a significant impact on the maximum bending moments about the hinge of and pedestal base of a conventional pedestal-mounted heliostat. This paper correlates the movement of the centre of pressure due to the mean and peak pressu...
Conference Paper
The unsteady surface pressure distribution on heliostats in a tandem arrangement is investigated in this experimental study. The differential pressure on the panel of a heliostat model is measured for a range of gaps, between the two tandem heliostats, varying from 1 to 7 times the chord length dimension of the panel. The heliostat models are place...
Conference Paper
This paper investigated the dynamic fluctuations of the high-frequency surface pressure and force measurements on an instrumented scale-model heliostat within a turbulent ABL generated in a wind tunnel. Peak aerodynamic load coefficients on the model heliostat calculated following the equivalent static wind load method were consistent with previous...
Article
This paper investigated the integral length scales of turbulence in a low-roughness atmospheric surface layer (ASL), characterised by very smooth terrain in the Utah desert during near-neutral conditions, and evaluated the Engineering Sciences Data Unit (ESDU) 85020 and 86010 predictions for the turbulence length scales in a low-roughness ASL. The...
Article
In the present work, thermo-physical properties of aqueous Graphene Nanoplatelet (GNP) at various mass concentrations of GNPs was experimentally measured. An experimental investigation was conducted to quantify the heat transfer coefficient, friction factor, pressure drop value, pumping power and thermo-hydraulic performance index of the nanofluid...
Article
Full-text available
In previous work, a frequency-domain model was developed from linear potential theory to investigate the oscillation modes and efficiency of a single-tether 3 degree-of-freedom submerged spherical point absorber with asymmetric mass distribution (SPAMD). It was found that the trajectory of the device has a strong correlation with the performance of...
Article
In the present work, an experimental study was conducted to quantify the heat transfer coefficient of a liquid metal mixture including gallium, indium and tin (Ga-In-Sn) under various heat fluxes inside a compact heat exchanger equipped with rectangular micro-passages. The microchannel was fabricated from Cu/Zn alloy using computer numerical contro...
Article
Full-text available
Formation of bubbles in water inside an annulus pipe in a flow boiling regime was experimentally investigated. The effect of various variables, such as total dissolved solid materials (TDS) in terms of mass fraction, flow rate of water, and applied heat flux (HF) on the heat transfer coefficient (HTC) and bubble behavior of water, was experimentall...
Conference Paper
Alternative structures have been proposed to improve light trapping and reduce radiative heat losses from central tower receivers. Bladed, star-shaped, and spiked receivers are candidates with a potential to improve light trapping and reduce thermal emissions. Of interest is the bladed receiver concept due to its ease of optical performance tuning...
Article
Mismatch of turbulence spectra from the corresponding full-scale conditions is a common challenge in wind tunnel modelling of unsteady wind loads on small-scale structures, such as solar panels, heliostats and low-rise buildings. Understanding the effect of this mismatch on the unsteady wind loads is necessary for providing an accurate estimation o...
Article
Full-text available
A thermodynamic assessment is conducted for a new configuration of a supercritical water gasification plant with a water–gas shift reactor. The proposed configuration offers the potential for the production of syngas at different H2:CO ratios for various applications such as the Fischer–Tropsch process or fuel cells, and it is a path for addressing...
Article
Full-text available
In the present work, an experimental investigation is performed to assess the thermal and electrical performance of a photovoltaic solar panel cooling with multi-walled carbon nanotube–water/ethylene glycol (50:50) nano-suspension (MWCNT/WEG50). The prepared nanofluid was stabilized using an ultrasonic homogenizer together with the addition of 0.1v...
Article
In the present work, a series of experimental studies were conducted to evaluate the thermo-hydraulic performance of glycerol-water mixture in a compact heat exchanger with straight microchannels at various volumetric concentrations of glycerol in water. Effect of applied heat flux, volumetric concentration of glycerol and the velocity of the mixtu...
Article
Full-text available
Wave energy converters (WECs) capable of extracting power in multiple degrees of freedom require special attention from control engineers as the control problem becomes multivariable involving highly coupled dynamics of the plant. Taking the three-tether submerged buoy as an example of a multi-degree-of-freedom WEC, this paper presents three main s...
Article
This paper analyses the effect of a mean shear similar to an atmospheric boundary layer on the wake of a wind turbine by means of Large Eddy Simulation. More specifically, a comparison is made between the wake in the presence of a smooth boundary layer and that in the absence of a boundary layer (i.e., an unconfined uniform incoming flow). The nume...
Article
Full-text available
The present work aims to investigate the plausible application of MgO-ethylene glycol as a heat transfer fluid in a double-pipe heat exchanger. The nanofluid was prepared using a two-step method at weight concentrations of 0.1, 0.2 and 0.3%. The test rig provided conditions to measure the convective heat transfer coefficient, pressure drop and fric...
Article
In the present work, an experimental investigation was conducted to quantify the heat transfer coefficient, thermal resistance and the thermal performance of a thermosyphon heat pipe charged with zirconia-acetone nanofluid. The thermosyphon was designed to operate at high heat fluxes such as 200 kW/m² (∼200 sun) similar or larger than the evacuated...
Article
We report an experimental demonstration of the chemical reactions for the chemical looping gasification process using molten bismuth oxide as the oxygen carrier. Cycling of the material without noticeable degradation was shown using a thermo-gravimetric analyser (TGA) furnace through both the reduction of bismuth oxide with carbon and its oxidation...
Article
The reversible reduction and oxidation (RedOx) reactions of CuO/Cu2O, Co3O4/CoO, Mn2O3/Mn3O4, and Pb3O4/PbO have been assessed experimentally with thermogravimetric Analysis (TGA). The temperature was maintained constant during charging and discharging of the thermochemical energy storage via pressure swing for a range of oxygen partial pressures s...
Article
In the present work, we report the results of a series of experiments for the hydrogen production via steam reforming of methanol with Cu–SiO2 porous catalyst coated on the internal walls of a micro-reactor with parallel micro-passages. The catalyst was prepared by coating copper and silica nanoparticles on the internal surface of the microchannel...
Article
Full-text available
In the present study, we report the results of the experiments conducted on the convective heat transfer of graphene nano-platelets dispersed in water-ethylene glycol. The graphene nano-suspension was employed as a coolant inside a micro-channel and heat-transfer coefficient (HTC) and pressure drop (PD) values of the system were reported at differe...