Audai Hussein al-abbas

• Professor
• Head of Department at Al-Furat Al-Awsat Technical University

In this paper, a comprehensive computational fluid dynamics (CFD) modelling study was undertaken by integrating the combustion of pulverized dry lignite in several combustion environments. Four different cases were investigated: an air-fired and three different oxy-fuel combustion environments (25vol.% O2 concentration (OF25), 27vol.% O2 concentrat...

Oxy-fuel combustion technique is a viable option to reduce several types of greenhouse gases (GHGs) emissions from the pulverized coal (PC) combustion systems. In this paper, a computational fluid dynamics (CFD) modelling study has been developed in order to investigate the Victorian brown coal combustion in a 550 MW utility boiler under the air-fi...

A computational fluid dynamics (CFD) model of the pyrolysis of a Loy Yang low-rank coal in a pressurised drop tube furnace (pdtf) was undertaken evaluating Arrhenius reaction rate constants. The paper also presents predictions of an isothermal flow through the drop tube furnace. In this study, a pdtf reactor operated at pressures up to 15 bar and a...

In the present paper, a three-dimensional numerical investigation of pulverized dry lignite was undertaken, integrating the combustion of four different scenarios adopted experimentally in a 100-kW Chalmers laboratory-scale furnace. A hybrid unstructured grid computational fluid dynamics (CFD) code was used to model and analyze: an air-fired, oxy-f...

A computational fluid dynamics (CFD) modeling study has been carried out. The study involved gaseous fuel combustion with associated chemical reactions, radiative heat transfer, and turbulence. The three different combustion environments that were adopted experimentally in a 100 kW drop-tube firing unit were examined. One air-fired and two oxy-fuel...

The use of wickless heat pipe heat exchangers has been improving a wide range of thermal applications such as solar water heaters. Therefore, more scientific research needs to be conducted to improve its performance. In the present study, a wickless heat pipe heat exchanger test rig has been designed and fabricated to investigate the effect of diff...

In the present paper, the effect of the Net Positive Suction Head (NPSH) for the centrifugal pump in a simple pipeline system has been carried out eliminating water hammer. Both the experimental tests and numerical calculations were performed in this study to investigate the transient flow effects when the discharges change abruptly in the system....

Numerical investigation for turbulent flow of nanofluid (Ethylene glycol/water-Al2O3) is carried out with a volume fraction of 0.5%, 1%, and 1.5%. The diameter of solid nanoparticles is equal to 20 nm. The range of Reynolds number in this simulation is from 6300 to 27500 through a three-dimensional steel corrugated spirally tube. For enhancement of...

In this study, experimental investigations and exergy analysis on shell and helically coiled tube heat exchanger are carried out for free convection heat transfer. The measured data are totally optimised utilizing thermodynamics rules in which exergy study is performed to investigate the thermal performance of the helical system under different ope...

Exhausted gas recirculation (EGR) technique is the main subject for the development of internal combustion engine and also one of the most prevalent methods for controlling the nitrogen oxides (NOx) and other exhausted gases from a petrol combustion engine. Present experiment investigation was conducted to explore the EGR impact on emissions and pe...

Computational Fluid Dynamics CFD modeling study was carried out to investigate the effect of the pin fins arrangements over the flat plate heat sink. The pin fins were adopted with in-line array form over the surface of the heat sink with different parameters. The CFD domain was designed by the use of ANSYS FLUENT 2019 R1 commercial software. The R...

Sheet hydroforming (SHF) or hydro-mechanical deep drawing (HDD) has been emerged as one of the desirable manufacturing processes particularly in automobile industries. This importance is appeared due to its capability of producing complex mechanical components in few steps. It also presents further advantages such as improved structural strength, s...

In centrifugal pumps, the flow physics and dynamic performances are generally affected by any modification in blades shape and design layout. The investigations of estimating the optimum impeller geometry and the appropriate number of blades with a fitting angle need to find a better insight. At the present time, the dominant verification method us...

The sources of fossil fuels in the world are limited, driving many researchers to seek alternative solutions for fuel. In particular, there is great interest in using unconventional fuel sources for vehicles. One of the main important sources of renewable fuel is bio-fuel, and alcohol is the most appropriate type of this resource. Both ethanol and...

Nowadays, the sources of fossil fuels in the world are restricted. Aware of this, there are many researchers to find alternative solutions to this conventional fuel. However, there is great interest in using unconventional sources in vehicles. One of the mainly important sources of renewable fuel is bio-fuel, and alcohol is the most appropriate kin...

The 3-D numerical simulations of the thermal collectors in solar heating systems were conducted to simulate the conventional solar heating system, multipurpose solar water heater (MPSWH), and multipurpose solar air heater (MPSAH). The commercial computational fluid dynamics (CFD), AVL Fire ver. 2009.2 was used to solve and investigate the temperatu...

Sheet hydroforming (SHF) or hydro-mechanical deep drawing (HDD) has been emerged as one of the desirable manufacturing processes particularly in automobile industries. This importance is appeared due to its capability of producing complex mechanical components in few steps. It also presents further advantages such as improved structural strength, s...

In this study, the effect of Gasoline, Ethanol, Gasohol E10, and Kerosene on the performance and combustion characteristics of a spark ignition (SI) engine were investigated. In the experiment, the internal combustion (IC) engine includes one cylinder, two valves, and four stroke spark ignition. Performance tests were carried out for specific fuel...

This paper presents a computational fluid dynamics (CFD) modelling study to investigate Victorian brown coal combustion in a 550 MW utility boiler under the air-fired (standard) and three oxy-fuel-fired cases. The standard case was modelled based on the real operating conditions of Loy Yang A power plant located in the state of Victoria, Australia....

In the present paper, a computational fluid dynamics (CFD) modelling study was performed for the combustion of the brown coal in a large-scale tangentially-fired furnace (550 MW) under different operating conditions. The AVL Fire CFD code has been used to model the furnace. The mathematical models of coal combustion with the appropriate kinetic par...

In the present paper, the effect of the Net Positive Suction Head (NPSH) for the centrifugal pump in a simple pipeline system has been carried out eliminating water hammer. Both the experimental tests and numerical calculations were performed in this study to investigate the transient flow effects when the discharges change abruptly in the system....

In the present paper, a computational fluid dynamics (CFD) modeling study was performed for the combustion of the brown coal in a large-scale tangentially-fired furnace (550 MW) under different operating conditions. The AVL Fire CFD code has been used to model the combustion processes. The mathematical models of coal combustion with the appropriate...

Thermal power plants are one of the most important process industries for engineering professionals. Over the past decades, the power sector is facing a number of critical issues; however, the most fundamental challenge is meeting the growing power demand in sustainable and efficient ways. Practicing power plant engineers not only look after operat...

Recently, the environmental and health threat from anthropogenic emissions of greenhouse gases (GHG) of power plants has been considered as one of the main reasons for global climate change [1]. The undesirable increase in global temperature is very likely because of increase the concentrations of these syngas in the atmosphere. The most important...

This paper presents a three-dimensional numerical investigation of pulverized dry lignite in a 100 kW oxy-fuel furnace. A computational fluid dynamics (CFD) code was used to model four different combustion scenarios. One air-fired combustion case and three oxy-fuel-fired cases, known as OF25 (25 vol. % O2 concentration), OF27 (27 vol. % O2 concentr...

At present, fossil-fuel power plants supply the majority of the world’s demand of electric energy. The environmental and health threats from anthropogenic emissions of greenhouse gases (GHG) of these power plants have been considered as one of the main reasons for global climate change. In order to make the existing fossil fuel energy sources more...

In the present paper, a three-dimensional numerical investigation of pulverized dry lignite was undertaken, integrating the combustion of four different scenarios adopted experimentally in a 100-kW Chalmers laboratory-scale furnace. A hybrid unstructured grid computational fluid dynamics (CFD) code was used to model and analyze: an air-fired, oxy-f...

A computational fluid dynamics (CFD) modeling study has been carried out. The study involved gaseous fuel combustion with associated chemical reactions, radiative heat transfer, and turbulence. The three different combustion environments that were adopted experimentally in a 100 kW drop-tube firing unit were examined. One air-fired and two oxy-fuel...

A computational fluid dynamics (CFD) modelling study is undertaken integrating the air-fired and oxy-fuel combustion cases for chemical reactions, radiative heat transfer, and gas compositions into a 3-D hybrid unstructured grid CFD code. A swirl injection system is used to achieve the flame stability of the turbulent non-premixed combustible gases...

In this paper, a comprehensive computational fluid dynamics (CFD) modelling study was undertaken by integrating the combustion of pulverized dry lignite in several combustion environments. Four different cases were investigated: an air-fired and three different oxy-fuel combustion environments (25 vol.% O2 concentration (OF25), 27 vol.% O2 concentr...

The distribution of temperature and its equivalent stresses is studied, during the forward extrusion process, and investigated the effects of die profile on that distribution were investigated. The finite element method represented by ANSYS ver.5.4 program is used. Two cases are presented, the first when the die profile is straight, and the other w...