Khor Chu Yee
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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

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  • Publication
    Effect of twist blade distributor on velocity distribution in a swirling fluidized bed
    ( 2020-12-18)
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Rosli M.U.
    ;
    Suhaida Rasman S.N.
    ;
    Mohd Riduan Jamalludin
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    Swirling Fluidized Bed (SFB) is one of the liquid-solid interaction in fluidization improved from conventional systems. This system is usually viewable in the power generation, chemical industry, material production and drying processes. Inside the SFB, there is annular blade distributor which will cause the air to pass through and create a swirl motion on the bed. The energy consumption of a fluidized bed system depends on the distributor's design. The current study has purpose a new design that applies to existing designs of blade inclination angle. The simulation study was conducted using Computational Fluid Dynamics (CFD) to obtain the result of velocity distribution and pressure drops on various blade distributor designs. This study uses two (2) twist angle (80 and 100 ) via number of blade distributor (40, 50 and 60). In this study, tangential velocity is the main velocity component by reason of the velocity represents the rotating air velocity in fluidization system. Overall, the design of the 100 twist angle and 40 blades distributor are the best distributors of blades compared to others.
  • Publication
    Simulation Analysis of the Thickness Effect towards Mechanical Aspects in the Design of Centrifugal Pump Casing
    ( 2020-07-09)
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Muhammad Ikman Ishak
    ;
    Ooi Z.K.
    ;
    Mohd Uzair Mohd Rosli
    ;
    Siti Nor Azreen Ahmad Termizi
    The strength of the centrifugal pump is crucial to ensure the safe pump operating when endure to unintended pumping condition. The presence of the solid particles and sudden increase of pressure may lead to the damage on the casing of a centrifugal pump and it becomes critical when the thickness of the casing is thin. This study aims to investigate the effects of the thickness on the mechanical aspects such as stress, strain and displacement in the casing design by using finite element (FE) analysis. The structure of the pump casing with various thicknesses is analyzed via FE-based software. The correlation of the wall thickness with the mechanical aspects is studied. The critical region with high stress was spotted in the simulation. The simulation results revealed the wall thickness demonstrated a polynomial correlation to the displacement and strain. The stress of the casing showed the linear correlation with the thickness. The critical region was noticed at the intersection region of the pump casing. The mechanical aspects of the pump casing were improved with the increment of the wall thickness in the pump casing design.
  • Publication
    Computational Fluid Dynamics Analysis of Varied Cross-Sectional Areas in Sleep Apnea Individuals across Diverse Situations
    ( 2024-01-01)
    Wan Mohd Faizal Wan Ab Rahim
    ;
    Khor Chu Yee
    ;
    Mohamad Suhaimi Shahrin
    ;
    Muhamad Nur Misbah
    ;
    Mohd. Hazwan Mohd. Hanid
    ;
    Masniezam Ahmad
    ;
    Mohd Haidiezul Jamal Ab Hadi
    Obstructive sleep apnea (OSA) is a common medical condition that impacts a significant portion of the population. To better understand this condition, research has been conducted on inhaling and exhaling breathing airflow parameters in patients with obstructive sleep apnea. A steady-state Reynolds-averaged Navier–Stokes (RANS) approach and an SST turbulence model have been utilized to simulate the upper airway airflow. A 3D airway model has been created using advanced software such as the Materialize Interactive Medical Image Control System (MIMICS) and ANSYS. The aim of the research was to fill this gap by conducting a detailed computational fluid dynamics (CFD) analysis to investigate the influence of cross-sectional areas on airflow characteristics during inhale and exhale breathing in OSA patients. The lack of detailed understanding of how the cross-sectional area of the airways affects OSA patients and the airflow dynamics in the upper airway is the primary problem addressed by this research. The simulations revealed that the cross-sectional area of the airway has a notable impact on velocity, Reynolds number, and turbulent kinetic energy (TKE). TKE, which measures turbulence flow in different breathing scenarios among patients, could potentially be utilized to assess the severity of obstructive sleep apnea (OSA). This research found a vital correlation between maximum pharyngeal turbulent kinetic energy (TKE) and cross-sectional areas in OSA patients, with a variance of 29.47%. Reduced cross-sectional area may result in a significant TKE rise of roughly 10.28% during inspiration and 10.18% during expiration.
  • Publication
    Effect of zinc addition on the performance of aluminium alloy sacrificial anode for marine application
    ( 2017-09-26)
    Khan B.
    ;
    Rosli M.U.
    ;
    Hazrin Jahidi Jaafar
    ;
    Muhammad Ikman Ishak
    ;
    Muhammad Syamil Zakaria
    ;
    Mohd Riduan Jamalludin
    ;
    Khor Chu Yee
    ;
    Wan Mohd Faizal Wan Ab Rahim
    ;
    Rahim W.M.
    ;
    Mohd Al-Hafiz Mohd Nawi
    In this work, the effect of zinc addition on the performance of aluminum-based sacrificial anode in seawater was investigated. The parameters used in assessing the performance of the cast anodes are anodic efficiency, protection efficiency and polarized potential. The content of zinc in the anodes was varied after die casting. The alloys produced were tested as sacrificial anode for the protection of mild steel for marine application at room temperature. Factors such as reactivity of zinc particles in the seawater, corrosion activity during the period of experiment, pH of seawater and the electronegativity potential of zinc were collected for analysis. Overall findings shows addition of zinc increases rate of corrosion to the sacrificial anode and the protection offered by the sacrificial anodes measured and collected in PIT shows the seawater react to sacrificial anode and no porosity reaction between the anodes. The microstructure showed the intermetallic structures of β-phase which breakdown the alumina passive film, thus enhancing the anode efficiency.
  • Publication
    A Short Review on Multi-stage Application in Fluidization Systems
    ( 2021-01-01)
    Silmie M.S.M.
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Ishak M.I.
    ;
    Rosli M.U.
    ;
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Faris M.A.
    ;
    Marzuki M.A.B.
    This research focuses on the implementation of an approach of multi-stage in fluidization systems in various aspects. The multi-stage fluidized bed has been proposed to improve the process and function of fluidization systems based on the current of the single-stage methods. The detailed of single-stage fluidization interaction method provides a realistic visualization of airflow and fluidization system interaction. In this article, a variant application, involving in multi-stage fluidized bed has been reviewed. In a few articles were analyzed, each manuscript was evaluated based on the scientific work via fluidization systems. The experimental study and analysis of airflow characteristics was a valuable tool to understand this phenomenon of the multi-stage fluidized bed process. Then the parameter, flow properties, activities of the multi-stage fluidized bed systems have been considered to the current swirling fluidized bed being applied to study. As a result of this short review, each multi-stage fluidized bed has its capability and suitability for its products and studies. Finally, the concentration of multi-stage fluidized bed is also highlighted in these manuscripts.
  • Publication
    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 bin 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.
  • Publication
    Numerical Simulation of Biodiesel Synthesis in T- Channel Microreactor
    ( 2020-07-09)
    Siti Nor Azreen Ahmad Termizi
    ;
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Syafiqah Binti Mohd Aris N.
    ;
    Muhammad Ikman Ishak
    ;
    Rosli M.U.
    Biodiesel promising as an alternative to the diesel. The transesterification reaction process involved the reaction of triglyceride with alcohol in the presence of catalyst. In the research, the Computational Fluid Dynamic (CFD) method was used to simulate the transesterification reaction process. The inlet pressure range from 0.0001 Pa to 0.01 Pa, temperature of 25°C, 50°C, 75°C and the molar ratio at 6:1, 9:1 were used to investigate their effect of toward the biodiesel conversion. Finding shows that high conversion of biodiesel occurred at low inlet pressure of 0.001 Pa with temperature of 50°C and the ethanol to oil molar ratio at 9:1.
  • Publication
    Computational fluid dynamics (CFD) simulation on mixing in Y-shaped micromixer
    ( 2020-11-02)
    Siti Nor Azreen Ahmad Termizi
    ;
    Ishak M.I.
    ;
    Khor Chu Yee
    ;
    Mohd Al-Hafiz Mohd Nawi
    ;
    Pouzay M.F.B.M.
    Computational Fluid Dynamics (CFD) is used to analyse the mixing process inY-shaped micromixer. This study used two different species which is ethanol/water and glycerol/water to see the differences of mixing quality between them based on their diffusion coefficient. The effect of the inlet velocity and mixing angle towards the mixing intensity in the Y-shaped micromixer were investigated via COMSOL Multiphysics software. Mixing intensity quantify the mixing performance is good or bad for every parameter simulated. The finding shows that the lower the inlet velocity, the higher the mixing intensity across the micromixer. The good mixing quality was at inlet velocity of 0.0001m/s while the ideal mixing angle was 90° degree. However, the mixing quality in term of diffusion coefficient, ethanol/water and glycerol/water shows insignificant differences.
  • Publication
    Turbulent Kinetic Energy of Flow during Inhale and Exhale to Characterize the Severity of Obstructive Sleep Apnea Patient
    ( 2023-01-01)
    Wan Mohd Faizal Wan Nik
    ;
    Khor Chu Yee
    ;
    Yaakob M.N.C.
    ;
    Ghazali N.N.N.
    ;
    Zainon M.Z.
    ;
    Ibrahim N.B.
    ;
    Razi R.M.
    This paper aims to investigate and present the numerical investigation of airflow characteristics using Turbulent Kinetic Energy (TKE) to characterize the upper airway with obstructive sleep apnea (OSA) under inhale and exhale breathing conditions. The importance of TKE under both breathing conditions is that it show an accurate method in expressing the severity of flow in sleep disorder. Computational fluid dynamics simulate the upper airway’s airflow via steady-state Reynolds-averaged Navier-Stokes (RANS) with k–ω shear stress transport (SST) turbulence model. The three-dimensional (3D) airway model is created based on the CT scan images of an actual patient, meshed with 1.29 million elements using Materialise Interactive Medical Image Control System (MIMICS) and ANSYS software, respectively. High TKE were noticed around the region after the necking (smaller cross-sectional area) during the inhale and exhale breathing. The turbulent kinetic energy could be used as a valuable measure to identify the severity of OSA. This study is expected to provide a better understanding and clear visualization of the airflow characteristics during the inhale and exhale breathing in the upper airway of patients for medical practitioners in the OSA research field.
  • Publication
    Production of Solid Biofuels From Renewable Resources: A Review
    ( 2023-06-09)
    Ras Izzati Ismail
    ;
    Khor Chu Yee
    ;
    Shaari A.R.
    ;
    Alina Rahayu Mohamed
    ;
    Abdul Halim M.H.B.
    ;
    Rahman A.A.A.
    ;
    Lee Yit Leng
    ;
    Nur Lailina Makhtar
    ;
    Norawanis Abdul Razak
    Increasing concerns over greenhouse gas emissions, volatile fossil fuel prices, and political instability have led to biomass as a renewable energy source. Close cooperation from the government supported by independent bodies also helps produce this effective and sustainable energy source. As a result, the current growth of solid biofuels has increased tremendously. Agricultural, municipal, forest, commercial waste and dedicated energy crops are the main sources of biomass. Due to this biomass's nature, the methods to produce them into solid biofuels are also different. The energy potential of these biomass sources is quite dependent on the use of technology and public awareness. Therefore, this paper review feedstock biomass, processing processes, product types and properties of solid biofuels in terms of mechanical and combustion. The paper also reviews the solid biofuel production situation in Malaysia.