DSpaceCRIS@UNITEN
http://dspace.uniten.edu.my:80/jspui
The DSpace digital repository system captures, stores, indexes, preserves, and distributes digital research material.
20180216T00:04:11Z

Safety of nuclear reactors part A: Unsteady state temperature history mathematical model
http://dspace.uniten.edu.my/jspui/handle/123456789/8587
Title: Safety of nuclear reactors part A: Unsteady state temperature history mathematical model
Authors: ElShayeb, M.; Yusoff, M.Z.; Boosroh, M.H.; Bondok, A.; Ideris, F.; Hassan, S.H.A.
Abstract: A nuclear reactor structure under abnormal operations of near meltdown will be exposed to a tremendous amount of heat flux in addition to the stress field applied under normal operation. Temperature encountered in such case is assumed to be beyond 1000°C. A mathematical model has been developed for the fire resistance calculation of a concretefilled square steel column with respect to its temperature history. Effects due to nuclear radiation and mechanical vibrations will be explored in a later future model. The temperature rise in each element can be derived from its heat balance by applying the parabolic unsteady state, partial differential equation and numerical solution into the steel region. Calculation of the temperature of the elementary regions needs to satisfy the symmetry conditions and the relevant material properties. The developed mathematical model is capable to predict the temperature history in the column and on the surface with respect to time.
20040101T00:00:00Z

Modeling on the effect of imbalance burner pressure and mass flow rate in a fullscale gas fired industrial boiler
http://dspace.uniten.edu.my/jspui/handle/123456789/8588
Title: Modeling on the effect of imbalance burner pressure and mass flow rate in a fullscale gas fired industrial boiler
Authors: Hasini, H.; Yusoff, M.Z.; Majid, K.A.; Ramli, M.R.; Hassan, H.; Hussein, I.; Boosroh, M.H.
Abstract: CFD simulation of the combustion process in a 120MW gas fired industrial boiler has been performed, with focus on the flow pattern and temperature distribution at the reheater section in the furnace. The modeling was done using generalpurpose CFD software, CFDACE+ developed by CFD Research Corporation. The effect of imbalance burner pressure is simulated by varying the mass flow rate of fuel (natural gas) injected at each burner. The simulation result shows good qualitative agreement with practical observation. The flow in the furnace is highly swirling with intense mixing and follows a helical pattern in an anticlockwise direction. Temperature distribution prior to entry to the reheater is significantly higher on the right side of the reheater. As a conclusion, the imbalance nozzles pressure creates uneven mass flow rate of air and fuel, which results in asymmetric flow pattern and temperature distribution at the reheater section.
20030101T00:00:00Z

Safety of nuclear reactors part B: Unsteadystate strength mathematical model
http://dspace.uniten.edu.my/jspui/handle/123456789/8586
Title: Safety of nuclear reactors part B: Unsteadystate strength mathematical model
Authors: ElShayeb, M.; Yusoff, M.Z.; Bondok, A.; Roseli, A.; Ideris, F.; Hassan, S.H.A.
Abstract: The significant mechanical properties that determine the strength of concretefilled square steel columns are compressive strength, modulus of elasticity, ultimate strain of the concrete, yield strength and modulus of elasticity of the steel. A survey of the literature shows that the variation of these properties with temperature is influenced by many factors. The compressive strength of concrete at elevated temperature is affected by the rate and duration of heating, the size and shape of the test specimen and the loading during the heating. During exposure to fire the strength of the column decreases with the duration of exposure. The strength of the column can be calculated by a method based on loaddeflection analysis which in turn is based on a stressstrain analysis of crosssections. A mathematical model describing the behavior of concretefilled square steel column structures under load and heat has been thoroughly examined in this paper. The main goals of this model are to study the structure member characteristics (temperature, deformation and strength) under excessive heat conditions and to study the possibility of increasing the endurance time by changing the column composite structure.
20040101T00:00:00Z

Investigations on the effect of blade angle on ventilated brake disc using CFD
http://dspace.uniten.edu.my/jspui/handle/123456789/8585
Title: Investigations on the effect of blade angle on ventilated brake disc using CFD
Authors: Munisamy, K.M.; Mokhtar, H.; Hasini, H.; Yusof, M.Z.; Idris, M.A.
Abstract: This paper presents the investigation on the effect of blade angle to the mass flow and heat transfer coefficient of a ventilated brake disc. Six different blade angle configurations are simulated using commercial computational fluid dynamics code, FLUENT. Important parameters such as mass flow rate of air through the ventilated blade and surface heat transfer coefficient are predicted and analyzed. Prediction shows reasonable estimation of mass flow rate and heat transfer coefficient on the disc brake. Linear trend is achieved on the mass flow and heat transfer coefficient as the vehicle speed increases. It is also concluded that the optimum mass flow and heat transfer coefficient are predicted at blade angle of 150. The prediction provides an insight into the behavior of the air flow through the restricted passage of the brake disc design. Copyright © 2005 by ASME.
20050101T00:00:00Z