Mazlan Mohamed

Simulation of nano carbon tube (NCT) in thermal interface material for electronic packaging application by using CFD software

This paper presents the nanocarbon tube in thermal interface material for electronic packaging application by using three dimensional numerical analysis of heat and fluid flow in computer. 3D model of electronic packaging is built using GAMBIT and simulated using FLUENT software. The study was made for a microprocessors arranged in line under different types of inlet velocities and package (chip) powers. The results are presented in terms of average junction temperature when chip powers have been increased from 2 W to 5 W. The junction temperature is been observed and it was found that the junction temperature of the electronic packaging using nanocarbon was able to wind stand the increasing in chip power from 2 W until 5 W. It also found that the material selection play important roles to control and manage the junction temperature. The strength of CFD software in handling heat transfer problems is proved to be excellent.

Comparison between Thermal Interface Materials Made of Nano Carbon Tube (NCT) with Gad Pad 2500 in Term of Junction Temperature by Using CFD Software, FluentTM

This paper presents the comparison between thermal interface materials made of nano carbon tube (NCT) with Gad Pad 2500 in term of junction temperature by using CFD Software, FluentTM. 3D model of electronic packaging is built using GAMBIT and simulated using FLUENT software. The study was made for a microprocessors arranged in line under different types of inlet velocities and package (chip) powers. The results are presented in terms of average junction temperature when chip powers have been increased from 0.5 W to 2 W. The junction temperature is been observed and it was found that the junction temperature of the electronic packaging using nano carbon has lower junction temperature compare to the Gad Pad 2500. It also found that the NCT was able to reduce the junction temperature up to 20-30% compare to others thermal interface material.

Potential of Fabricated Light Foamed Concrete in Reducing Radon from Building Material

Three of Light Foamed Concrete (LFC) have been obtain by using different formula of Cement:Aggregates. The brick was locate into a closed Perspex box and the net of 222Rn concentration level have been measured for 5 consecutive days. The results show the LFC 3 has produced the lowest of net 222Rn concentration level in air, followed by LFC 2 and LFC 1, respectively. The result also show the 222Rn concentration level have been influenced by the temperature and relative humidity in air.

Treatment of Oily Waste Using Activated Carbon from Agriculture Waste

Malaysia is one of the main crude oil exporters among countries in Association of South East Asian Nations, ASEAN. Therefore, oil is widely used in many sectors, especially in transportation sectors, and it will produce a lot of oil-based waste that will harm environment. Activated carbon can help to treat this waste by using the permeable reactive barrier (PRB) concept. At the same time, Malaysia is also an agricultural based country which produces a massive amount of agricultural waste. In this study, sugarcane bagasse, corn cob and pineapples core is chosen to produce activated carbon by using furnace heating processing and microwave processing.

Effects of Soil Physical Properties to the Corrosion of Underground Pipelines

Corrosion of metals in soil be able to change from comparatively fast material loss to insignificant effects, depending on soil environment. Corrosion is a process of deterioration of metal surfaces degraded into another compound. Soil is one of the medium known to have constituted to corrosion of metals. The soil creates an environment for the corrosion to react. The buried pipelines are exposed to the soil that may experience corrosion attack. The study of the soil as corrosion environment is important to mitigate the problem due to the environment and economy. There are factors that contribute to the corrosion process. This study concentrates on corrosion properties that expose to soil environment particularly underground pipelines. The mild steel coupons taken from actual pipelines, stimulating and analyzing the physic-chemical characteristics of the soil environment. The soil is sandy clay in natural. A total summed index of 2 numerical scale, thus, indicates that the soil tested was mildly to non-corrosive. The corrosion rate increase with increasing of moisture content and pH value. The observations on the coupon surface also did in order to study the morphology.

A review of incorporating Nd:YAG laser cleaning principal in automotive industry

Abstract Laser cleaning has been identified as an ideal technology to replace conventional chemical techniques in the motorcar coating removal process to maintain the sustainability of our environment. This is due to the unique characteristics of this cleaning technique, such as being versatile, precise, controllable, lack of waste generation, and environmental friendly process. This laser technique can remove the coating layers without using chemical products and prevents the metal substrate surfaces from defect. This paper reviews the potential of incorporating pulsed Nd:YAG laser and its principals in coating removal for automotive industry with respect to these characteristics.

ECONOMIC ANALYSIS ON PRICO PROCESS FOR NATURAL GAS LIQUEFACTION BASED ON TCI CRITERIA

Liquefied Natural Gas has become a global fuel with an annual trade volume growth of more than 7%, an expected growth of 6.7% per year until 2020 and with a current trade volume of over 240 million tons. There were seven main liquefaction technologies in use, the most common one being the PRICO process, also known as Single Mixed Refrigerant (SMR). PRICO LNG process comprises of only single mixed refrigerant and one NG stream, thus makes it the simplest LNG process exists so far. This paper applies economic analysis to a PRICO process to determine the Total Capital Investment (TCI). The analysis in this paper using the results that was obtained from energetic analysis by executed the simulation using DWSIM software. The results obtained after calculated the TCI later is discussed with a few criteria of TCI itself. Keywords: LNG; PRICO; economic; total capital investment; DWSIM

Finite element analysis of heat sink in term of thermal and temperature distribution with different chip power input

This paper presents the simulation of heat sink by using Workbench 18.0 Software to simulate the temperature distribution at different chip power input. 3D model of heat sink is generated using Design Modeler using the same dimension with experimental setup. The study was made for a heat sink mounted on the power source (Chip) under different types of chip powers. The results are presented in terms of temperature distribution when chip powers have been increased from 1 W to 10 W. The temperature distribution is been observed and it was found that the temperature distribution of the heat sink has lower temperature when power source at 1 W and increase significantly when the power source rise up to 10 W. The increase the temperature of heat sink is from 30.8oC up to 96.2oC estimated to be 212% the increase of temperature. The simulation also been verify by using different time step use during the simulation and using grid independency test to ensure the simulation result is accurate.

Fungal Resistance of Particleboard Made Using Glutardialdehyde Modified Corn Starch as the Binder with the Aid of Urea Formaldehyde Resin

Particleboard is a popular wood composite made using mixtures of wood particles and resin, binder or adhesives, pressed at high temperature to cured. Despite its popularity, formaldehyde-based adhesives used in the formulations lead to cancerous effect as the formaldehyde fumes released from the unreacted chemicals travel into human lungs. Therefore this study tries to reduce the utilization of formaldehydebased resin by replacement of a significant portion of the binder with glutardialdehyde modified corn starch as the binder. However, this practice could lower the durability of the particleboards against biological attack. Therefore, this study evaluates the fungal resistance of the particleboard panels. Panels were manufactured using 83:15:2 ratio of wood, corn starch-modified with glutardialdehyde and formaldehyde resin, respectively, as an improvement. Four types of wood-degrading fungal were chosen including Trametes versicolor, Formitopsis palustris, Schizophyllum commune and Pycnoporus sangineus. Some of the particleboard showed a little increased in fungal resistance when 2% urea formaldehyde was added, compared to using glutardialdehyde modified corn starch and starch only as the binder. Nine out of twelve samples showed a decrement in fungal degradation by using glutardialdehyde modified starch as the binder. Meanwhile, 6 out of 12 samples showed higher fungal resistance after additional of 2% urea formaldehyde in the binder formulation. Based on the results, combination of modified corn starch and urea formaldehyde resin could have a potential to be used in particleboard making without reducing the initial resistance towards fungal attack.

The Morphology and Mechanical Study on Neolamarckia cadamba and Endospermum diadenum in Wood Composite for Particleboard Application

This research was carried out to investigate the morphology of particleboard by using lesser-known commercial timbers (LKCT) species which are well-known in scientific name as neolamarckia cadamba (NC) and endospermum diadenum (ED). NC and ED are fast growing species available in Peninsular Malaysia. Single layer particleboard was fabricated from urea formaldehyde (UF) blended with NC and ED at different species ratio. The morphological observation on particleboard was conducted using field emission scanning electron microscopy. Particleboard boards with different resin content and species ratio. The results indicated that 7:3 of NC: ED with ratio at 12% of UF have a significant effect in term of surface morphology compared to 1:0 of NC: ED. This can be proved through mechanical and physical properties testing where NC: ED particleboard panel with 7:3 ratio exhibit the highest strength according to EN standard. NC particles can be used as a raw materials to wood-based particleboard for general purpose application.