WorldCat Identities

Hassan, N. M. S.

Overview
Works: 13 works in 14 publications in 1 language and 14 library holdings
Roles: Author
Publication Timeline
.
Most widely held works by N. M. S Hassan
Bubble rise phenomena in various non-Newtonian fluids by N. M. S Hassan( Book )

2 editions published in 2011 in English and held by 2 WorldCat member libraries worldwide

"The bubble rise characteristic is very important for the design of heat and masss transfer operations in chemical, biochemical, environmental, and food processing industries. The rate of heat and mass transfer is affected by the bubble size, pressure inside the gas phase, interaction between bubbles, rise velocity and rising trajectory. Research on bubble rise phenomena in non-Newtonian fluids is very limited and there is an increased demand for further research in this area since most of the industrial fluids are non-Newtonian in nature. This study investigated the bubble rise phenomena in water (Newtonian fluid) and various non-Newtonian stagnant fluids"--Abstract
Modeling of bubble flow distribution in crystal suspended non-Newtonian fluids by N. M. S Hassan( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

This paper investigates a computational study of air bubbles rising in massecuite equivalent non-Newtonian crystal suspensions. Bubble rise motion inside the stagnant liquid of 0.05% xanthan gum crystal suspension was investigated and modelled using computational fluid dynamics (CFD) model to gain an insight into the bubble flow distribution. CFD code FLUENT was used for numerical simulation and bubble rise characteristics were computed through a Volume of Fluid (VOF) model. The influences of the Reynolds number (Re) along with other dimensionless groups such the Weber number (We), and the Eötvös number (Eo) on bubble velocity and bubble trajectory are discussed. The effects of the vortices on bubble velocity distribution are analyzed. The simulated results of the bubble flow contours were validated by the experimental results. The model developed is capable of predicting the entire flow characteristics of different sizes of bubble inside the liquid column
An experimental investigation of bubble rise characteristics in a crystal suspended non-Newtonian fluid by N. M. S Hassan( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

An experimental study of the bubble rise characteristics in non-Newtonian fluid with crystal suspension is presented in this paper. The suspension was made of different concentration of xanthan gum solutions with 0.2:1 mm polystyrene crystal particle. Different percentage of crystal content (by weight) INas used to vary rheological properties. The effect of crystal particles and bubble volumes on thc bubble rise velocity and bubble trajectory is analysed. The results show that the average bubble velocity increases with the increase in bubble volume for crystal suspended xanthan gum solution. In trajectory analysis, it is seen that the small bubbles expericnced less horizontal motion in crystal suspended xanthan gumsolution while larger bubbles followed a spiral motion. Experimentally determined data for the drag coefficient at high Reynolds number are compared with the results of other analytical and experimental studies availabe in the literature The reported experimental data of drag co-efficient increases in crystal suspended xanthan gum solution for corresponding bubble volume and was found to be consistent with published data
Modelling of air bubble rising in water and polymeric solution by N. M. S Hassan( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

This study investigates a Computational Fluid Dynamics (CFD) model for a single air bubble rising in water and xanthan gum solution. The bubble rise characteristics through the stagnant water and 0.05% xanthan gum solution in a vertical cylindrical column is modelled using the CFD code Fluent. Single air bubble rise dispersed into the continuous liquid phase has been considered and modelled for two different bubble sizes. Bubble velocity and vorticity magnitudes were captured through a surface-tracking technique i.e. Volume of Fluid (VOF) method by solving a single set of momentum equations and tracking the volume fraction of each fluid throughout the domain. The simulated results of the bubble flow contours at two different heights of the cylindrical column were validated by the experimental results and literature data. The model developed is capable of predicting the entire flow characteristics of different sizes of bubble inside the liquid column
Air bubble trajectories in polymeric solution and crystal suspension by N. M. S Hassan( )

1 edition published in 2008 in English and held by 1 WorldCat member library worldwide

The experimental results of bubble trajectory in xanthan gum solution, xanthan gum crystal suspension and water are presented in this paper. The suspension was made of 0.05% concentration of xanthan gum solution with 1% (by weight) of 0.23 mm polystyrene crystal particle. The characteristic of the air bubble trajectory in these three different liquids is analysed. The influences of the Reynolds number andthe Weber number on bubble trajectory are discussed. The results show that the smaller bubbles (0.1 mL) experienced more horizontal movement in water than in other liquids. On the other hand, larger bubbles (>5mL) produced less spiral motion in water than in other liquids. Conversely, the smaller bubbles (0.1 mL)followed least horizontal motion and larger bubbles (>5mL) produced more spiral motion for crystal suspension. Path instability occurred at the bubbles of 2mL and 5mL and they induced both zigzag and spiral trajectory for all liquids. At low Re and We, smaller bubble produced a zigzag trajectory while larger bubbles (> 5mL) showed a spiral trajectory at high Re and We
Performance assessment of earth pipe cooling system for low energy buildings in a subtropical climate( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

Highlights: Earth pipe cooling performance was investigated in a subtropical climate in Australia. A thermal model was developed using Fluent to assess the cooling performance. A temperature reduction of around 2 °C was found for the earth pipe cooling system. Annual energy savings of maximum 866.54 kW (8.82%) was achieved for a 27.23 m 3 room. Abstract: Energy consumption in heating and cooling around the world has been a major contributor to global warming. Hence, many studies have been aimed at finding new techniques to save and control energy through energy efficient measures. Most of this energy is used in residential, agricultural and commercial buildings. It is therefore important to adopt energy efficiency measures in these buildings through new technologies and novel building designs. These new building designs can be developed by employing various passive cooling systems. Earth pipe cooling is one of these which can assist to save energy without using any customary mechanical units. This paper investigates the earth pipe cooling performance in a hot humid subtropical climate of Rockhampton, Australia. A thermal model is developed using ANSYS Fluent for measuring its performance. Impacts of air velocity, air temperature, relative humidity and soil temperature on room cooling performance are also assessed. A temperature reduction of around 2 °C was found for the system. This temperature reduction contributed to an energy saving of a maximum of 866.54 kW (8.82%) per year for a 27.23 m 3 room
Proceedings of the 22nd Annual Conference for the Australasian Association for Engineering Education : 5-7 December 2011, Fremantle, Western Australia : developing engineers for social justice : community involvement, ethics and sustainability by Australasian Association for Engineering Education( Book )

1 edition published in 2011 in English and held by 1 WorldCat member library worldwide

Proceedings of the 22nd Annual Conference of the Australasian Association for Engineering Education, held in Fremantle, Western Australia in December 2011. The theme for the conference is 'Developing engineers for social justice : community involvement, ethics and sustainability' and the four sub-themes: humanitarian engineering; inclusivity; ongoing graduate professional development; and pathways into engineering
Computational fluid dynamics analysis of a flat plate photocatalytic reactor for storm and wastewater reuse by Saber Ahmed( )

1 edition published in 2010 in English and held by 1 WorldCat member library worldwide

A computational fluid dynamics (CFD) analysis has beenperformed for a flat plate photocatalytic reactor using CFD codeFLUENT. Under the simulated conditions(Reynolds number, Rearound 2650), a detailed time accurate computation shows thedifferent stages of flow evolution and the effects of finite lengthof the reactor in creating flow instability, which is important toimprove the performance of the reactor for storm and wastewaterreuse. The efficiency of a photocatalytic reactor for pollutantdecontamination depends on reactor hydrodynamics andconfigurations. This study aims to investigate the role of differentparameters on the optimization of the reactor design for itsimproved performance. In this regard, more modelling andexperimental efforts are ongoing to better understand theinterplay of the parameters that influence the performance of theflat plate photocatalytic reactor
Modelling and experimental investigation of engine performance and emissions fuelled with biodiesel produced from Australian Beauty Leaf Tree( )

1 edition published in 2015 in English and held by 1 WorldCat member library worldwide

Highlights: Compression ignition (CI) engine performance and emission testing using biodiesel. Biodiesel produced from Australian Beauty Leaf Tree (BLT) oil. Engine combustion model development using CFD program AVL Fire. Optimisation of engine performance and emissions using energy balance. New knowledge towards development of BLT biodiesel industry in Australia. Abstract: This study first experimentally investigates the performance and exhausts emissions of a compression ignition (CI) engine fuelled with biodiesel produced from Australian beauty leaf tree (BLT) oil and compares these results with that of petroleum diesel. Then, an engine combustion model is developed using computational fluid dynamics (CFD) software, AVL Fire, to predict the engine performance and emission of those biodiesels and petroleum diesel. Experiments were done according to ISO 8178 standard engine test procedure using B5 biodiesel (5% BLT blend), B10 (10% BLT blend) and petroleum diesel in a 4-cylinder engine test-bed equipped with necessary dynamometer and sensors. The measurements were done for engine power, torque, specific fuel consumption and engine emissions. The combustion model is validated with the experimentally measured data, which shows very good agreement between them, more specifically variation of only up to 4.4% in power, 4.0% in torque and 3.3% in specific fuel consumption was found. The experimental results show that overall B10 biodiesel provides significantly reduced engine emissions, up to 18% compared to petroleum diesel. The validated model is then used to optimise the engine performance and emissions as a function of operating parameters such as ignition timing, crank angles and compression ratios. The simulation results show that B10 provides a slight improvement in performance and significant reduction in emission. It is believed that this paper provides a solid base of new knowledge towards achieving a sustainable BLT biodiesel industry
An Experimental study of the bubble rise velocity and trejectory in water under pressure and vacuum by N. M. S Hassan( )

1 edition published in 2006 in English and held by 1 WorldCat member library worldwide

Bubble rise through a liquid is an important phenomenon in the engineering practice. Bubbles are used in polymer, metallurgy, biotechnology and especially in process industries for improving the heat and mass transfer. An experimental investigation on the bubble rise velocity and trajectory in a stagnant water column under different pressure and vacuum is presented in this study. The experiments were conducted at water heights of 1 m, 1.2 m, 1.4 m and 1.6 m by introducing different bubble volumes (0.1 mL 15.0 mL) corresponding to each height. The bubble rise velocity and trajectory were measured using a combination of non-intrusive (high speed photographic) method and digital image processing. The parameters that significantly affect the rise of air bubble are identified. The effect of different water heights and bubble volumes on the bubble rise velocity and trajectory is analysed and the influence of two different sizes of tubes on the bubble velocity for various bubble volume is discussed
A sustainable production in sugar industries : study of an improved vacuum pan performance through numerical simulations by N. M. S Hassan( )

1 edition published in 2009 in English and held by 1 WorldCat member library worldwide

This paper presents at improving existing vacuum pan (large cylindrical vessels with vertical heating surfaces) operation through numerical simulations, in particular for the sugar industries, and at enhancing the competitiveness of Australian industries. Therefore, this study investigates a Computational Fluid Dynamics (CFD) model for a single air bubble rising in non-Newtonian polymeric and crystal suspension. The bubble rise characteristics through different stagnant liquids in a vertical cylindrical column are modelled using the CFD code Fluent. Air bubble rise dispersed into the continuous liquid phase has been considered and modelled for two different bubble sizes. Bubble trajectory and velocity distributions were captured through a surface-tracking technique i.e. Volume of Fluid (VOF) method by solving a single set of momentum equations and tracking the volume fraction of each fluid throughout the domain. The simulated results of the bubble flow contours were validated by the experimental results and literature data. The model developed is capable of predicting the entire flow characteristics of different sizes of bubble inside the liquid column. The simulated data is used in sugar industries to gain knowledge, optimise and develop improved vacuum pan design that can achieve more productive performance and result in improved steam economy. The possible modification of the vacuum pan design enhances the sugar industrys competitive edge in the global market place by reducing production cost and less green house gas emissions
Parametric study on thermal performance of horizontal earth pipe cooling system in summer( )

1 edition published in 2016 in English and held by 1 WorldCat member library worldwide

Highlights: Horizontal earth pipe cooling (HEPC) performance was investigated by a parametric study. A thermal model was developed using FLUENT for the parametric study. Air velocity, pipe length and pipe diameter showed noticeable impact on HEPC performance. Pipe length greatly influenced the HEPC performance compared to other parameters. Abstract: Rational use of energy and its associated greenhouse gas emissions has become a key issue for a sustainable environment and economy. A substantial amount of energy is consumed by today's buildings which are accountable for about 40% of the global energy consumption. There are on-going researches in order to overcome these and find new techniques through energy efficient measures. Passive air cooling of earth pipe cooling technique is one of those which can save energy in buildings with no greenhouse gas emissions. The performance of the earth pipe cooling system is mainly affected by the parameters, namely air velocity, pipe length, pipe diameter, pipe material, and pipe depth. This paper investigates the impact of these parameters on thermal performance of the horizontal earth pipe cooling system in a hot humid subtropical climate at Rockhampton, Australia. For the parametric investigation, a thermal model was developed for the horizontal earth pipe cooling system using the simulation program, FLUENT 15.0. Results showed a significant effect for air velocity, pipe length, and pipe diameter on the earth pipe cooling performance, where the pipe length dominated the other parameters
Bubble rise velocity and drag co-efficient at high reynolds number in power-law fluids by N. M. S Hassan( )

1 edition published in 2007 in English and held by 1 WorldCat member library worldwide

Abstract: - Air bubbles are used in chemical, biochemical, environmental, and food process for improving the heat and mass transfer. Due to the dominance of non-Newtonian liquids used in various process industries, an understanding of bubble rise in rheologically complex liquids has grown to be important. An experimental study of the bubble rise velocity and drag co-efficient at high Reynolds number in non-Newtonian (Power-Law) fluids are presented in this paper. The main characteristics, namely, the bubble velocity and the drag relationship are investigated at high Reynolds numbers (Re<4000). The experiments were conducted in 125 mm and 400 mm cylindrical column at liquid heights of 1 m, 1.2 m, 1.4 m and 1.6 m by introducing different bubble volumes (from 0.1mL to 20.0mL) corresponding to each height. The bubble rise velocity and bubble size were measured using a combination of non-intrusive (high speed photographic) method and digital image processing. The parameters that significantly affect the rise of air bubble are identified. The effect of different liquid heights and bubble volumes on the bubble rise velocity is analysed and the influence of two different sizes of tubes on the bubble velocity for various bubble volume is discussed. A correlation of the drag coefficient at high Reynolds number is explained and compared with the results of other analytical and experimental studies available in the literature
 
moreShow More Titles
fewerShow Fewer Titles
Audience Level
0
Audience Level
1
  Kids General Special  
Audience level: 0.48 (from 0.34 for Bubble ris ... to 0.88 for Modelling ...)

Languages
English (14)