Abdeh Hamed

About Abdeh Hamed

Abdeh Hamed, With an exceptional h-index of 8 and a recent h-index of 7 (since 2020), a distinguished researcher at Università degli Studi di Bergamo,

His recent articles reflect a diverse array of research interests and contributions to the field:

A Combined Experimental and Numerical Analysis on the Aerodynamics of a Carbon-Ceramic Brake Disc

Large eddy simulation on effects of trench geometry on film cooling effectiveness through fan-shaped holes

Large Eddy simulation in optimizing trench configuration to improve cooling effectiveness of a laidback fan-shaped hole

Rotor cascade assessment at off-design condition: an aerodynamic investigation on platform cooling

PSP and LES Investigation on the Impact of Trench Depth on Flat Plate Film Cooling Through Shaped Holes

The aero-thermal performance of purge flow and discrete holes film cooling of rotor blade platform in modern high pressure gas turbines: a review

Film Cooling Effectiveness Measurement of Fan-Shaped Holes Manufactured Using Electrical Discharge Machining Technique

Sol-Gel Assisted Immobilization of Alizarin Red S on Polyester Fabrics for Developing Stimuli-Responsive Wearable Sensors

Abdeh Hamed Information

University

Università degli Studi di Bergamo

Position

___

Citations(all)

188

Citations(since 2020)

166

Cited By

90

hIndex(all)

8

hIndex(since 2020)

7

i10Index(all)

7

i10Index(since 2020)

5

Email

University Profile Page

Università degli Studi di Bergamo

Top articles of Abdeh Hamed

A Combined Experimental and Numerical Analysis on the Aerodynamics of a Carbon-Ceramic Brake Disc

Authors

Samaneh Rouina,Giovanna Barigozzi,Hamed Abdeh,Daniel A Palomino Solis,Paolo Iavarone

Journal

SAE International Journal of Passenger Vehicle Systems

Published Date

2024/1/4

Composite ceramic brake discs are made of ceramic material reinforced with carbon fibers and offer exceptional advantages that translate directly into higher vehicle performance. In the case of an electric vehicle, it could increase the range of the vehicle, and in the case of conventional internal combustion engine vehicles, it means lower fuel consumption (and consequently lower CO2 emissions). These discs are typically characterized by complex internal geometries, further complicated by the presence of drilling holes on both friction surfaces. To estimate the aerothermal performance of these discs, and for the thermal management of the vehicle, a reliable model for predicting the air flowing across the disc channels is needed. In this study, a real carbon-ceramic brake disc with drilling holes was investigated in a dedicated test rig simulating the wheel corner flow conditions experimentally using the particle image …

Large eddy simulation on effects of trench geometry on film cooling effectiveness through fan-shaped holes

Authors

Ali Zamiri,Hamed Abdeh,Giovanna Barigozzi,Jin Taek Chung

Journal

International Journal of Heat and Mass Transfer

Published Date

2023/12/1

Modern gas turbines require the use of external film-cooling techniques to effectively cool the turbine blades, which are heated by hot combustion gases. Large eddy simulation (LES) is conducted to numerically evaluate the influences of trench configurations on film-cooling effectiveness and flow-field behavior of a shaped hole. The cooling hole was a laidback fan-shaped hole with a 17.5-degree forward expansion angle located on a flat plate surface with a 30-degree injection angle at a constant blowing ratio of 2.0 and a constant density ratio of 1.5. The computed film-cooling effectiveness was validated with that obtained in the experimental data for the reference case at two blowing ratios. Two geometrical parameters of the trench height and width were selected as design variables, and overall area-averaged film-cooling effectiveness was considered as an objective function. The Latin Hypercube sampling …

Large Eddy simulation in optimizing trench configuration to improve cooling effectiveness of a laidback fan-shaped hole

Authors

Ali Zamiri,Giovanna Barigozzi,Hamed Abdeh,Jin Taek Chung

Journal

International Communications in Heat and Mass Transfer

Published Date

2023/10/1

In modern gas turbines, a thermal barrier coating (TBC) is used to protect the components of the turbine from the hot flow coming from the combustor, which results in the cooling holes on the blade surfaces being embedded in a 2D trench slot. In this study, large eddy simulations (LES) were carried out to investigate the effects of trench geometry on the film-cooling effectiveness of a shaped cooling hole. The shaped cooling hole is located on a flat surface with an injection angle of 30 degrees, and the blowing and density ratios are fixed at 1.5. Thirteen different designed cases were sampled using Box-Behnken method based on three different geometry parameters of the trench slot, trench height and upstream and downstream trench lengths. A genetic aggregation algorithm was applied to achieve the optimal trench configuration that maximizes the overall cooling effectiveness. The film-cooling performance …

Rotor cascade assessment at off-design condition: an aerodynamic investigation on platform cooling

Authors

Hamed Abdeh,Giovanna Barigozzi,Nicoletta Franchina

Journal

International Journal of Turbomachinery, Propulsion and Power

Published Date

2023/7/22

Off-design condition of a rotor blade cascade with and without platform cooling was experimentally investigated. The ability of the gas turbine to operate down to 50% to 20% of its nominal intake air flow rate has an important consequence in the change in the inlet incidence angle, which varied from nominal to −20°. Platform cooling through an upstream slot simulating the stator-to-rotor interface gap was considered. The impact of rotation on purge flow injection was simulated by installing fins inside the slot to give the coolant flow a tangential direction. Aerodynamic measurements to quantify the cascade aerodynamic loss and secondary flow structures were performed at Ma2is = 0.55, varying the coolant to main flow mass flow ratio (MFR%) and the incidence angle. The results show that losses strongly increase with MFR. A negative incidence allows a reduction in the overall loss even when coolant is injected with a high MFR. The more negative the incidence, the greater the loss reduction.

PSP and LES Investigation on the Impact of Trench Depth on Flat Plate Film Cooling Through Shaped Holes

Authors

Hamed Abdeh,Giovanna Barigozzi,Ali Zamiri,Jin Taek Chung

Published Date

2023/6/26

To increase film cooling effectiveness levels downstream of film cooling holes, trenches manufactured in the thermal barrier coating can be adopted. The performance of this solution depends on the trench geometrical characteristics, namely its depth and width. A LES based numerical study has been performed at Korea University to investigate the effects of trench configuration on the thermal protection, resulting in a 22% increase in cooling performance compared to the reference case without a trench. The present paper reports the results of an experimental investigation carried out at Bergamo University on a Plexiglass flat plate model with a set of three fan-shaped holes incorporated into an existing wind tunnel, replicating the numerical setup. PSP technique was used to measure the adiabatic film cooling effectiveness. Besides the standard shaped hole case, the best and worst trench configurations …

The aero-thermal performance of purge flow and discrete holes film cooling of rotor blade platform in modern high pressure gas turbines: a review

Authors

Giovanna Barigozzi,Hamed Abdeh,Samaneh Rouina,Nicoletta Franchina

Published Date

2022/7/4

Design of cooling systems for rotor platforms is critical due to the complex flow field and heat transfer phenomena related to the secondary flow structures originating at the blade leading edge. Horseshoe vortex and passage vortex are the fluid-dynamic features that largely influence the aerodynamic behaviour and the thermal protection level of the platform. The driving parameter is the coolant to mainstream momentum flux ratio, but several issues have to be considered in the design process of cooling technologies. As well acknowledged, an in-depth understanding of losses and heat transfer phenomena are deemed necessary to design effective cooling systems. In the present review, measurements and predictions on the behaviour of the HPT rotor cooled platform, obtained during the last two decades by several research groups, are gathered, described and analysed in terms of aerodynamic losses and heat transfer performance, and are compared with one another with respect to the effectiveness level that is ensured.

Film Cooling Effectiveness Measurement of Fan-Shaped Holes Manufactured Using Electrical Discharge Machining Technique

Authors

Samaneh Rouina,Hamed Abdeh,Giovanna Barigozzi,Vittorio Odemondo,Luca Abba,Matteo Iannone

Journal

Journal of Turbomachinery

Published Date

2022/7/1

In this study, the influence of geometric factors such as hole diameter (D), length-to-diameter ratio (L/D), injection angle (α), and lateral expansion angle (β) on film cooling effectiveness of holes made using electrical discharge machining (EDM) is experimentally investigated. Nine different cooling configurations were tested on a flat plate wind tunnel at various coolant Reynolds number (Rec) and coolant-to-mainstream blowing ratio (M). The considered flat plate model incorporates engine-sized V-shaped holes. EDM reliability is assessed through a hole qualification process, while effectiveness was measured by the pressure-sensitive paint (PSP) technique. Results confirm the suitability of EDM for V-shaped hole manufacturing as long as a correct tolerance on β is prescribed. An accurate qualification of hole morphology is also recommended.

Sol-Gel Assisted Immobilization of Alizarin Red S on Polyester Fabrics for Developing Stimuli-Responsive Wearable Sensors

Authors

Valentina Trovato,Alessio Mezzi,Marco Brucale,Hamed Abdeh,Dario Drommi,Giuseppe Rosace,Maria Rosaria Plutino

Journal

Polymers

Published Date

2022/7/8

In the field of stimuli-responsive materials, introducing a pH-sensitive dyestuff onto textile fabrics is a promising approach for the development of wearable sensors. In this paper, the alizarin red S dyestuff bonded with a sol-gel precursor, namely trimethoxy-[3-(oxiran-2-ylmethoxy)propyl]silane, was used to functionalize polyethylene terephthalate fabrics, a semi-crystalline thermoplastic polyester largely used in the healthcare sector mainly due to its advantages, including mechanical strength, biocompatibility and resistance against abrasion and chemicals. The obtained hybrid halochromic silane-based coating on polyester fabrics was investigated with several chemical characterization techniques. Fourier transform infrared spectroscopy and X-ray Photoelectron Spectroscopy confirmed the immobilization of the dyestuff-based silane matrix onto polyethylene terephthalate samples through self-condensation of hydrolyzed silanols under the curing process. The reversibility and repeatability of pH-sensing properties of treated polyester fabrics in the pH range 2.0–8.0 were confirmed with diffuse reflectance and CIELAB color space characterizations. Polyester fabric functionalized with halochromic silane-based coating shows the durability of halochromic properties conversely to fabric treated with plain alizarin red S, thus highlighting the potentiality of the sol-gel approach in developing durable halochromic coating on synthetic substrates. The developed wearable pH-meter device could find applications as a non-invasive pH sensor for wellness and healthcare fields.

V-shaped holes for full coverage film cooling of a high-pressure nozzle guide vane

Authors

Giovanna Barigozzi,Hamed Abdeh,Samaneh Rouina,Luca Abba,Matteo Iannone,Vittorio Odemondo

Journal

Journal of Turbomachinery

Published Date

2021/11/1

This paper describes an experimental activity carried out to investigate the potential of V-shaped holes for film cooling a high-pressure nozzle guide vane. The newly designed V-shaped scheme was compared with standard laidback fan-shaped holes. The influence of showerhead cooling was also assessed. Different injection conditions were examined under the same cascade operating condition using CO2 as a coolant. The quality of holes geometry and their discharging behavior was first characterized. Then, dual-luminophore pressure-sensitive paint (PSP) was used for measuring the adiabatic film cooling effectiveness all over the vane surface. Results of the current work showed that using a V-shaped hole configuration would give nearly the same surface protection as standard shaped holes with a reduced number of holes and, thus, at lower coolant flow consumption.

Numerical Assessment of Density Ratio and Mainstream Turbulence Effects on Leading-Edge Film Cooling: Heat and Mass Transfer Methods

Authors

Silvia Ravelli,Hamed Abdeh,Giovanna Barigozzi

Journal

Journal of Turbomachinery

Published Date

2021/4/1

Within the context of leading-edge film cooling in a high-pressure turbine vane, the present study is a step forward toward modeling showerhead performance for a baseline geometry (namely four staggered rows of cylindrical holes) at engine-like conditions, starting from a previous investigation, at low-speed flow (exit isentropic Mach number of Ma2is = 0.2), low inlet turbulence intensity of Tu1 = 1.6%, and density ratio of DR ∼ 1. Those operating conditions, dictated by experimental constraints, were essential to validate results from delayed detached-eddy simulation (DDES) against off-the-wall measurements of velocity, vorticity, and turbulent fluctuations, for the coolant-to-mainstream blowing ratio of BR = 3 (momentum flux ratio of I = 9). Here, the potential of DDES is exploited to predict the aerothermal features of the flow in the leading-edge region in the presence of a larger density ratio (DR ∼ 1.5) and …

Experimental investigation of the influence of density ratio and vane exit Mach number on platform cooling

Authors

Hamed Abdeh,Giovanna Barigozzi,Silvia Ravelli,Samaneh Rouina

Published Date

2021

The present paper reports the results of an experimental investigation of the influence of coolant to mainstream density ratio (DR) on the thermal and aerodynamic behavior of a nozzle vane cascade with platform cooling through slot or discrete holes. Measurements were carried out on a 6 vane cascade at low (1.6%) and high (9%) inlet turbulence intensity level, with blowing ratios (BR) varied in the range of 1-2. Tests were performed injecting carbon dioxide (DR= 1.5) as coolant flow. Aerodynamic investigations were performed by means of a miniaturized 5-hole pressure probe traversed in a downstream plane to assess the impact of the aforementioned parameters on secondary flows structure and related losses. Concerning thermal measurements, the binary PSP technique was employed to measure the adiabatic film cooling effectiveness. Three platform cooling schemes have been investigated: the first one features a slot located upstream of the leading edge, the second one makes use of cylindrical holes distributed both upstream and inside of the passage and the last one is based on standard 10-10-10 shaped holes. These results will be compared with previous data [1] obtained testing the same cooling schemes with a high inlet turbulence intensity level and injecting air as coolant (DR= 1). These cooling schemes are representative of real engine platform film cooling configurations and will allow to critically assess the impact of density ratio and mainstream turbulence intensity level on cascade aerodynamic and thermal performance for variable injection conditions.[1] G. Barigozzi, A. Perdichizzi, L. Abba, L. Pestelli, 2020,“Platform Film …

Influence of geometrical parameters and reynolds number on flat plate film cooling effectiveness

Authors

Samaneh Rouina,Hamed Abdeh,A Perdichizzi,Giovanna Barigozzi,V Odemondo,L Abba,M Iannone

Published Date

2020/9/21

In the present paper the influence of geometrical deviations, related to the manufacturing process or to a different hole positioning over the vane surface, and of coolant Reynolds number on flat plate film cooling through shaped holes are experimentally investigated. Hole geometrical parameters, such as the length of the cylindrical section, hole injection angle, lateral and forward expansion angles were varied and tested for blowing ratio M values between 1.0 and 2.0, also changing the coolant Reynolds number. The dual-luminophore Pressure Sensitive Paint (PSP) technique was used for measuring the adiabatic film cooling effectiveness distribution. Compared with the standard geometry, the V-shaped hole was shown to produce a better thermal protection, especially in the near hole region. Effectiveness is strongly affected by relatively small changes in the hole geometry, like the length of the cylindrical …

A Parametric Investigation of Vane Showerhead Film Cooling by Pressure-Sensitive Paint Technique

Authors

Hamed Abdeh,Giovanna Barigozzi,Silvia Ravelli,Samaneh Rouina

Journal

Journal of Turbomachinery

Published Date

2020/3/1

In this study, a parametric analysis of the thermal performance of a nozzle vane cascade with a showerhead cooling system made of four rows of cylindrical holes was carried out by using the pressure-sensitive paint (PSP) technique. Coolant-to-mainstream blowing ratio (BR), density ratio (DR), main flow isentropic exit Mach number (Ma2is), and turbulence intensity level (Tu1) were the considered parameters. The cascade was tested in an atmospheric wind tunnel at Ma2is values ranging from 0.2 to 0.6, with an inlet turbulence intensity level of 1.6% and 9%, at variable injection conditions of BR = 2.0, 3.0, 4.0. Moreover, the influence of the DR on the leading-edge film-cooling performance was investigated: the testing was carried out at DR = 1.0, using nitrogen as foreign gas, and DR = 1.5, with carbon dioxide serving as a coolant. In the near-hole region, higher BR and Ma2is resulted in higher effectiveness …

See List of Professors in Abdeh Hamed University(Università degli Studi di Bergamo)

Abdeh Hamed FAQs

What is Abdeh Hamed's h-index at Università degli Studi di Bergamo?

The h-index of Abdeh Hamed has been 7 since 2020 and 8 in total.

What are Abdeh Hamed's top articles?

The articles with the titles of

A Combined Experimental and Numerical Analysis on the Aerodynamics of a Carbon-Ceramic Brake Disc

Large eddy simulation on effects of trench geometry on film cooling effectiveness through fan-shaped holes

Large Eddy simulation in optimizing trench configuration to improve cooling effectiveness of a laidback fan-shaped hole

Rotor cascade assessment at off-design condition: an aerodynamic investigation on platform cooling

PSP and LES Investigation on the Impact of Trench Depth on Flat Plate Film Cooling Through Shaped Holes

The aero-thermal performance of purge flow and discrete holes film cooling of rotor blade platform in modern high pressure gas turbines: a review

Film Cooling Effectiveness Measurement of Fan-Shaped Holes Manufactured Using Electrical Discharge Machining Technique

Sol-Gel Assisted Immobilization of Alizarin Red S on Polyester Fabrics for Developing Stimuli-Responsive Wearable Sensors

...

are the top articles of Abdeh Hamed at Università degli Studi di Bergamo.

What is Abdeh Hamed's total number of citations?

Abdeh Hamed has 188 citations in total.

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