5 research outputs found
Enhanced microwave heat susceptor crucible / Muhammad Azwadi Sulaiman ... [et al.]
No full textMicrowave (MW) irradiation is an attractive technique of material processing. Reasons for the growing interest in the use of microwave energy are including rapid heating, enhanced densification rate, decreased sintering active energy and improved microstructure. MW heating also has the
potential for energy and cost savings when comparing with conventional heating. The use of microwave in ceramic processing is a relatively recent development. The technique can be applied effectively and efficiently to heat and sinter ceramic object. In this study, the microwave heat
susceptor crucible was formulated and enhanced to convert the microwave energy to heat at very high efficiency. The performance was surpassing the existing product in market and the invention was patented for commercialization
Simulation of mixed convection heat transfer using lattice boltzmann method
No full textIn this paper, mixed (forced–natural) convective heat transfer around a heated square cylinder located inside a lid driven cavity has been studied numerically using the lattice Boltzmann method in the range of 100=Re =1000 with the corresponding Richardson number 0.01=Ri=10. The double-population lattice Boltzmann formulation is used as the governing equation. Two dimensional nine-velocity models areused for the computation of the velocity field while a four-velocity model is used for the computation of thetemperature field. We found that the combination of nine- and fourvelocity models can be applied tothe calculation without losing its accuracy. Theresults are presented in the form of streamline and isotherm plots as well as the variation of local Nusselt number at the top surface of theheated square. The computational results demonstrate that the flow pattern, formation of vortex and also the Nusselt number are influence by theReynolds number and Richardson number
Zn-Doped Calcium Copper Titanate Synthesis via Microwave-Assisted Technique
No full textElectroceramic material has become significant in the recent development of electronic parts such as capacitors, resonators, and sensors. The previous study on calcium copper titanate (CaCu3Ti4O12, CCTO) showed that CCTO exhibits a colossal dielectric constant, up to 105 for bulk materials using a conventional synthesis route (calcine and sinter at 900 - 1040? for 9 - 12 hours). The high firing temperature and longer reaction time were undesirable because they would increase production costs and be time-consuming. Alternately, research findings on doping with donor or acceptor elements were proven to be an effective technique for improving dielectric properties. Thus, the Zn-doping (Zn= 0, 1, and 3 mol%) method increased the dielectric constant in CCTO. The study successfully synthesized Zn-doped CCTO at 700? with a soaking time of 40 minutes using a microwave-assisted technique (calcined and sintered). Then, the samples were characterized using XRD and an impedance analyzer. The CCTO crystal formation was examined through an XRD pattern, and semi-quantitative analysis indicated that 1 mol% of Zn-doped recorded optimum formation reaction after calcining (56.5 wt%) and as-sinter (70.3 wt%). However, despite the low formation of CCTO crystal structure in 3 mol% of Zn-doped (34.9 wt%), it has the highest dielectric constant, and the dielectric loss was reduced at high frequency
A Design of Mini Hydro Turbine System at Orang Asli Village, Kg Redig Pos Hau, Gua Musang
No full textThis research project investigates the feasibility of implementing a mini-hydro power system in Kampung Redig, a remote Orang Asli village in Pos Hau, Gua Musang, Malaysia, to address the community\u27s ongoing electricity challenges. The village currently relies on a mix of solar panels and diesel generators, both of which are unsustainable due to high maintenance costs and increasing fuel prices. Designed by the Faculty of Bioengineering and Technology at Universiti Malaysia Kelantan (UMK) in collaboration with the Society of Petroleum Engineers Kuala Lumpur Section (SPEKL), and industry experts, the mini-hydro system utilises the kinetic energy of river water to generate up to 101 kW of electricity. This research explores the system\u27s technical design and potential to provide a more sustainable and affordable energy source for the village. Additionally, the project offers economic benefits by involving the Orang Asli community in the installation process, providing them with valuable skills and income. The results demonstrate the positive impact of renewable energy solutions on rural communities, fostering stronger relationships between the Orang Asli, UMK, and external stakeholders while improving living standards through reliable electricity access
