Mohd Uzair Mohd Rosli
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Preferred name
Mohd Uzair Mohd Rosli
Official Name
Mohd Uzair , Mohd Rosli
Alternative Name
Rosli, M. U.
Rosli, M. U.M.
Mohd Rosli, Mohd Uzair
Rosli, Mohd Uzair Mohd
Main Affiliation
Scopus Author ID
57220942859
Researcher ID
GDP-5189-2022

Research Output
Now showing 1 - 10 of 13
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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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Simulation-based optimization of plastic transfer molding parameter for thin small outline package via response surface methodology

2024 , Mohd Uzair Mohd Rosli , Chu Yee Khor

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Computational Fluid Dynamics (CFD) Simulation on Mixing in T-Shaped Micromixer

2020-12-18 , Ahmad Termizi S.N.A. , Khor Chu Yee , Ahmad N. , Mohd Al-Hafiz Mohd Nawi , Muhammad Ikman Ishak , Mohd Uzair Mohd Rosli , Mohd Riduan Jamalludin

Computational Fluid Dynamics (CFD) simulation used to analyse the fluid mixing in micromixer. There are two cases of miscible liquids that involved within T-shaped micromixer which are ethanol-water and glycerol-water. The T-shaped micromixer consist of micro channel with two inlets channels and one outlet channel was constructed by using AutoCAD software. The effect of inlet velocity and width size toward mixing intensity were investigated. The mixing intensity values determine either good or bad mixing quality could be achieved. In this simulation, at low inlet velocity indicates good mixing quality as the mixing intensity value approaching to one. Whereas the effect of width size on mixing intensity are almost similar throughout simulated width sizes. Mixing intensity for the two cases of diffusion coefficient showed similar trend for different inlet velocity and width size of mixing channel.

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Simulation-based optimization of plastic injection molding parameters for mini centrifugal pump body using response surface methodology

2020-12-18 , Mohd Uzair Mohd Rosli , Mohd Riduan Jamalludin , Siti Nor Azreen Ahmad Termizi , Fahim F. , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi , Muhammad Ikman Ishak

Control parameters of the injection molding and fabrication process are essential to the success of any micro-molding product fabrication. The goal of the study is to simulate and optimise the parameter for the plastic mini micro centrifugal pump body by using Response Surface Methodology. The material for this micro part is Polyphenylene Sulphide (PPS). This study is also investigating the impact of design parameters and processing parameters on the quality of a plastic moulded part to obtain optimal response and meets the requirement specification. The control factors chosen for this study are melting temperature, cooling time and injection pressure. Based on the complex shape of the body part of mini micro pump, volumetric shrinkage and warpage are selected as the essential quality that needs to be controlled. The selected processing parameter are melting temperature, cooling time and injection pressure. As a result, the optimum values suggested by the software are melt temperature of 315.98 C, cooling time of 362s and injection pressure of 62MPa. With small differences error value between solution and simulation, 0.27% for volumetric shrinkage and 0.19% for warpage, the result was acceptable.

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

2020 , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi , Muhammad Ikman Ishak , Kee Wei Chin , Mohd Uzair Mohd Rosli , 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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Biomechanical assessment of different surgical approaches of zygomatic implant placement on prosthesis stress

2020-12-18 , Muhammad Ikman Ishak , Mohd Uzair Mohd Rosli , Mohd Riduan Jamalludin , Siti Nor Azreen Ahmad Termizi , Khor Chu Yee , Mohd Al-Hafiz Mohd Nawi

The treatment of severely atrophic posterior maxillae without bone augmentation by using zygomatic implants has received a major attention in prosthodontics due to great implant survival rates. However, mechanical implant system failures were still reported irrespective of surgical techniques used for zygomatic implant placement. Two main prominent approaches, the intrasinus and extramaxillary possess their own advantages and drawbacks with no particular indication found, to date, to highlight the best technique in relation to prosthesis stress. Thus, this study emphasised on the computational evaluation of both approaches with regards to the prosthesis responses. Two sets of finite element models comprising bones, soft tissue, implants, abutments, and prosthesis were prepared accordingly. The models were then assigned with the material properties, contact modelling, and loadings as closely as possible with the real conditions. The results showed that the extramaxillary technique reported a more promising maximum stress value and distribution within the prosthesis than the intrasinus. Moreover, the prostheses in both approaches seemed to have a low tendency to failure as the stress levels were significantly less than the stress limit of the material.

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Engineering a Better Slice : Development of an Efficient Watermelon Slicing Tool

2025-06 , Mohd Uzair Mohd Rosli , Muhammad Syamil Zakaria , Masniezam Ahmad , Lim Jit Chao , Ng Chung Kit , Phong Jun Yuan

The Watermelon Slicer project focuses on the design and development of a mechanical tool to efficiently and safely slice watermelons. The objective is to address the challenges associated with manually cutting large and irregularly shaped fruits, which often pose difficulties in terms of safety, consistency, and time consumption. The proposed device integrates ergonomic design with sharp cutting mechanisms to achieve uniform slices with minimal physical effort. Key factors considered in the design include user safety, ease of use, material durability, and cutting precision. Prototypes were tested under various operational conditions to assess performance in terms of cutting efficiency, slice uniformity, and user comfort. Results demonstrate that the slicer significantly reduces preparation time while enhancing safety compared to conventional methods. The study concludes that the watermelon slicer presents an effective, time-saving solution for both domestic and commercial applications. Future work will involve further refinements to improve the product’s versatility for cutting a wider range of fruits and vegetables.

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Simulation-based optimization of plastic injection molding parameter for automotive car wheel fabrication using Response Surface Methodology (RSM)

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

In the era of revolution industry 4.0, most companies can expect metal-to-plastic conversion to result in cost savings. The objectives of this study are to find the most appropriate material composition and the injection molding process parameter to produce a plastic car wheel as a substitute for metal and aluminum alloy. The Polyetherimide (PEI) with different compositions are simulated using MoldFlow software and optimized the quality of injection molding process parameter by using Central Composite Design (CCD) in Response Surface Methodology (RSM) as to get an optimal response and meets the car wheel requirement specification. The crucial factors are melting temperature, injection time and cooling time. The quadratic model fits the model response. As the results, the optimum values suggested by the software were melt temperature of 370.27°C, 1.8s of injection time and 2599.89s of cooling time for 0% of filler (pure PEI). With small differences error value between solution and simulation, 0.1% of shrinkage and 0.9% for warpage, the results were acceptable.

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Effect of twist blade distributor on velocity distribution in a swirling fluidized bed

2020 , Mohd Al-Hafiz Mohd Nawi , Muhammad Ikman Ishak , Mohd Uzair Mohd Rosli , Siti Nor Suhaida Rasman , 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.

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