Khor Chu Yee
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Preferred name
Khor Chu Yee
Official Name
Khor, Chu Yee
Alternative Name
Yee, Khor Chu
Khor, Chu Yee
Khor, C. Y.
Yee, K. C
Main Affiliation
Scopus Author ID
57193315174
Researcher ID
B-1541-2014

Research Output

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Effect of heat sink design on the thermal characteristic in computational fluid dynamics analysis

2020-12-18 , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi , Ishak M.I. , Kee W.C. , Rosli M.U. , Mohd Riduan Jamalludin , Siti Nor Azreen Ahmad Termizi

The thermal management in the electronic device or system using the heat sink is important to ensure the device or system operating under the allowable temperature. The present study aims to investigate the thermal characteristic (i.e., temperature distribution) of the various heat sink designs via computational fluid dynamics (CFD) analysis. The electronic cooling process of the heat sink is carried out via CFD software. The temperature distribution of the various heat sink designs (i.e., plate fin, circular pin fin and rectangular fin) was analyzed and compared. The CFD analysis revealed the plate fin heat sink has lowest temperature distribution on the fin region. High temperature distribution was observed on the pin fin heat sink. The non-uniform temperature distribution was attributed by the direction of inlet airflow, whereas the low temperature was found in the region that close to the inlet airflow. Thus, the research findings indicated the design of heat sink significantly affects the temperature distribution during the electronic cooling process.

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A Novel Green Technology Kaffir Lime Extract as Lizard Repellent

2020-03-18 , Mohd Al-Hafiz Mohd Nawi , Ishak M.I. , Rosli M.U. , Ayub M.A.R.M. , Khor Chu Yee , Siti Nor Azreen Ahmad Termizi , Ishak N.

The ubiquity of lizard in homes and has caused huge problem to human. They are one of the very important agents to transmit Salmonella that cause food poisoning towards human being. Through this research the potential of Kaffir lime peel toward lizard was reported. The process to produce Kaffir lime extract is hydrodistillation extraction method. The repellency test of essential oil will be assess at different concentration (0%, 25%, 50%, 75% and 100%). The duration of observation will be test from 3 to 6 hour duration. The results has shown that the concentration up to 50% and above of essential oil from Kaffir lime peel extraction may reflect the lizards in a state of discomfort.

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Experimental and computational evaluations of the mechanical stresses of banana trunk fibre-reinforced epoxy resin composite in coffee table application

2020 , Muhammad Ikman Ishak , Mohd Uzair Mohd Rosli , Khor Chu Yee , C N Ismail , Mohd Al-Hafiz Mohd Nawi

The banana plant including the trunk is normally disposed after it has produced fruits once in its lifetime and becoming unproductive. Herbicide injection and burning using kerosene are the examples of current disposing method. Those methods are unfavourable owing to bad effects to the environment. Therefore, the unproductive banana trunk through its fibre properties, has a high potential to be used as composite in saving the environment. Three tensile test specimens were prepared with two of them have different length of banana fibres – shorter and longer than 0.5 mm, whilst another specimen has no fibres. The elastic modulus, Poisson’s ratio, and vertical load of 2 GPa, 0.3, and 981 N, respectively, were applied towards numerical models. The results exhibited that the composite with short banana fibre length promoted encouraging maximum and break stress values. Besides, the properties of the composite are well appropriate to be applied in furniture making as satisfactory stress value recorded in the computational analysis.

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Heat transfer and deformation analysis of flexible printed circuit board under thermal and flow effects

2020 , Chong Hooi Lim , M.Z. Abdullah , I. Abdul Azid , Khor Chu Yee , M.S. Abdul Aziz , M.H.H. Ishaik

Purpose: The purpose of this study is to investigate heat transfer and deformation of flexible printed circuit board (FPCB) under thermal and flow effects by using fluid structure interaction. This study simulate the electronic cooling process when electronic devices are generating heat during operation at FPCB under force convection. Design/methodology/approach: The thermal and flow effects on FPCB with attached ball grid array (BGA) packages have been investigated in the simulation. Effects of Reynolds number (Re), number of BGA packages attached, power supplied to the BGA packages and size of FPCB were studied. The responses in the present study are the deflection/length of FPCB (δ/L) and Nusselt number (Nu). Findings: It is important to consider both thermal and flow effects at the same time for understanding the characteristic of FPCB attached with BGA under operating condition. Empirical correlation equations of Re, Prandtl number (Pr), δ/L and Nu have been established, in which the highest effect is of Re, followed by Pr and δ/L. The δ/L and (Formula presented.) were found to be significantly affected by most of the parametric factors. Practical implications: This study provides a better understanding of the process control in FPCB assembly. Originality/value: This study provides fundamental guidelines and references for the thermal coupling modelling to address reliability issues in FPCB design. It also increases the understanding of FPCB and BGA joint issues to achieve high reliability in microelectronic design.

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Impact of Cu Pillar Bump Diameter and Solder Material on Reflow Soldering: A Computational Study with Thermal Fluid–Structure Interaction

2023 , Jing Rou Lee , Mohd Sharizal Abdul Aziz , Khor Chu Yee , Mohammad Hafifi Hafiz Ishak , Roslan Kamarudin , F. Che Ani

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Optimization of a novel spray flash desalination system integrated with concentrated solar power utilizing response surface methodology

2023 , Faizan Ahmed , Mohd Sharizal Abdul Aziz , Feroz Shaik , Khor Chu Yee

In the present study, the performance of a novel spray flash desalination system integrated with concentrated solar power is experimentally investigated and optimized. The effect of four factors, namely, flow rate (0.2–0.4 LPM), feed water temperature (30–50 °C), salinity (15,000–35,000 PPM), and vacuum pressure (0.1–0.5 bar), was examined on three responses (i.e., condenser exit temperature, boiler exit temperature, and distillate production). Mathematical models are developed for each response, and optimization is performed with Design Expert software using response surface methodology. The results revealed that the feed water temperature and vacuum pressure positively impacted condenser and boiler exit temperatures and vice versa for salinity and flow rate. However, the flow rate, feed water temperature, and vacuum pressure were found to impact the distillate production positively. The optimum factor settings are 0.4 LPM flow rate, 50 °C feed temperature, 15,000 PPM salinity, and 0.5 bar vacuum pressure for optimal condenser exit temperature of 55 °C, boiler exit temperature of 58.8 °C, and distillate 7010 mLPH. The energy and exergy analyses were conducted, and the mean efficiencies were found to be 55.6 % and 2.2 %, respectively.

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A study on the effect of fin pitch variation on the thermal performance of a bus duct conductor

2023 , Mark Selvan , Mohd Sharizal Abdul Aziz , Kok Hwa Yu , Mohd Sharif Nurulakmal , Heng Pin Ong , Khor Chu Yee

The numerical results of this work provide an optimum design for a three-dimensional natural convection heat sink on the bus duct conductor's casing. The size of the fin pitch is regarded as a design variable. Using ANSYS FLUENT, a numerical model that closely resembles the experimental setup was created. The experimental data were compared to the IEC 60439-1 and IEC 60439-2 standards as a benchmark. Five potential fin pitch sizes (s1 = 1.0 mm, s2 = 1.5 mm, s3 = 2.0 mm, s4 = 3.0 mm, and s5 = 4.0 mm) were taken into consideration. It was shown that as the fin pitch gap size is reduced, the average surface temperature falls. According to the investigation, conduction resistance increased while convective resistance reduced as the fin pitch gap size grew. The overall heat resistance did, however, rise. The optimal fin pitch size, s1 = 1 mm, outperformed the other fin pitches in terms of thermal performance. The current numerical analysis expects an improved knowledge of the influence of fin pitch on a bus duct conductor's thermal performance.

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Multi Response Optimization of Injection Molding Parameters for Artificial Phalanx Bone Using Response Surface Methodology

2021-01-01 , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi , Ishak M.I. , Zainal S. , Rosli M.U. , Siti Nor Azreen Ahmad Termizi

Unintended features of the injected part may affect the quality of the product. The present study aims to optimize the injection molding parameters and minimize the shrinkage and sink marks for artificial phalanx bone of the index finger via response surface methodology (RSM). The injection molding process was numerically simulated by the software. The combination of the process parameters was designed by Central Composite Design (CCD) in RSM. Three important process parameters were considered, which are melting temperature, cooling time and injection pressure. Meanwhile, two responses (i.e., volumetric shrinkage and sink marks) were considered in the multi-objective optimization. Regression model, ANOVA analysis and perturbation plot analysis were also highlighted in this study. The simulation results revealed two most significant factors towards the responses and the optimum setting of process parameters were recommended to minimize the shrinkage and sink marks of the injected artificial phalanx bone. The optimum injection molding process parameters are 240 Â°C of melting temperature, 40 s of cooling time and 12 MPa of injection pressure. The optimized results are expected to be used as the reference in the fabrication of the artificial phalanx bone via injection molding.

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Influence of different materials on the mechanical aspects in the design of cyclone gasifier

2020 , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi , Muhammad Ikman Ishak , Z. X. Wei , Mohd Uzair Mohd Rosli

Cyclone gasifier is used as the energy conversion system for the biomass. The design and material selection for the cyclone gasifier is important, which affect the strength of the gasifier during the operation. This research aims to investigate the effect of the various materials to the mechanical aspects (i.e., stress, strain and displacement) of the cyclone gasifier. The mechanical aspects analysis is carried out by using the finite element (FE) based software. The stress, strain and displacement of the cyclone gasifier’s structure was analyzed for various stainless steel materials (i.e., ferritic (FSS), AISI 316, 1023 CSS, 201 ASS and AISI 4130). The finite element analysis revealed the use of 201 ASS experienced highest stress (221 MPa). Lowest strain and displacement were found on 201 ASS and 1023 CSS, respectively. These research findings are expected to be used as the reference for the engineer in the material selection process for the design and fabrication of cyclone gasifier.

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Chip morphology and surface integrity in turning AZ31 Magnesium alloy under dry machining and submerged convective cooling

2023 , Muhammad Syamil Zakaria , Mazli Mustapha , Azwan Iskandar Azmi , Khor Chu Yee

Magnesium alloys have broad applications, including medical implants and the aerospace sector owing to their great density and high strength-to-weight ratio. Dry cutting is a frequent technique for machining this material. However, it always leads to an excessive rise in temperature due to the absence of cooling at the cutting zone, which affects the machined surface integrity and chip morphology. In this study, chip morphology and surface integrity of the AZ31 magnesium alloy were investigated in the turning process using an internal cooling method called submerged convective cooling (SCC) to overcome the absence of cooling in dry cutting. This method can exploit the advantage of the high specific heat capacity of water as a cooling fluid without any reaction between water and magnesium to create a cooling element in the cutting zone. The chip morphologies and surface integrity were analyzed experimentally with varying cutting speeds under SCC and dry cutting. The experimental results revealed that SCC and dry cutting produced saw-tooth or serrated chip formation. The chips produced in dry cutting were continuous, while SCC was short and discontinuous as a result of a severe crack on the back surface of the chip. It was discovered that the grain refinement layer on the machined samples was thinner under SCC turning. SCC machining increased the microhardness of the AZ31 magnesium alloy by 60.5% from 55 HV to 88.3 HV, while dry turning exhibited a 49% increase in microhardness. The result revealed that surface roughness improved by 10.8%, 9.4% and 4.7% for cutting speeds (V) of 120, 180, and 240 m/min, respectively, under the SCC internal cooling. Based on the result obtained, SCC cutting outperformed dry cutting in terms of chip breakability, grain refinement, microhardness, and surface roughness.

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