Siti Nor Azreen Ahmad Termizi
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Preferred name
Siti Nor Azreen Ahmad Termizi
Official Name
Siti Nor Azreen, Ahmad Termizi
Alternative Name
Ahmad Termizi, S. N.A.
Termizi, S. N.A.Ahmad
Termizi, Siti Nor Azreen Ahmad
Main Affiliation
Scopus Author ID
57000566700
Researcher ID
GXA-2631-2022

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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.

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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.

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Blockchain-Based Transaction Data Structure Design for Process Integration and Industrial Symbiosis System

2023-01-01 , Chin H.H. , Varbanov P.S. , Siti Nor Azreen Ahmad Termizi , Alwi S.R.W. , Manan Z.A.

Industrial Symbiosis (IS) and Process Integration (PI) are important activities with the potential to save resource intake and environmental footprints. Process Integration has been done theoretically and in practice for several decades but is still missing an efficient tool for multi-actor documentation and information preservation. The current paper sets out to develop data structures and tool prototypes for data preservation and transaction recording in process designs and Industrial Symbiosis (IS) to support the advancement of decentralised information tracking. The blockchain concept is utilised in this paper, where the information on the key properties of the streams and process stages can be stored in a secured block, and the transaction of resources can be dealt with using the information from the chain of blocks. Each block can represent the actors of the process in the IS, and an actor can request to join the blockchain by mining the blocks and going through the Proof-of- Work (PoW) verification of the new block. This paper introduces several terms to formulate a proper blockchain to store the information and showcase a simple simulation of adding/removing blocks for an IS system. The illustrative case study demonstrates that the method can evaluate Industrial Symbiosis and Process Integration solutions and track the key properties of the streams and process stages, costs, revenues, and environmental footprints.

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Mechanical Design and Analysis of Safety Medical Syringe for Needlestick Injury Prevention

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

The occurrence of needlestick injury especially among healthcare workers and patients is really significant since long time ago. Apart from improper syringe usage management, the reuse syringe components and unsafe sharp wastes management also contribute to the incidence of unexpected injuries. It was reported that one of every 250 accidental needlesticks may result in the infection of human immunodeficiency viruses (HIV), Hepatitis B (HBV), or Hepatitis C (HCV). Based on the user needs identification, promising safety mechanism and handling as well as single use of the syringe are of major interests. Thus, the aim of the study was to design and develop a new syringe that completed with safety and ergonomic features to avoid the related injuries. Primary and secondary data had been collected through interview, observation and journal articles with a series of design concept development, three-dimensional (3-D) modelling, and computational technical evaluation stages were then undertaken. A number of mock-ups and prototype of the product was produced via rapid prototyping process which is 3-D printing approach using acrylonitrile butadiene styrene (ABS) as the material. The results showed that the proposed design of safety syringe is satisfactory in terms of its structural strength and working principle. Further enhancement may be necessary to strengthen the role of the material and needle cap in compensating the function of the syringe.

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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.

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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.

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Potential Application of Blockchain Technology in Eco-Industrial Park Development

2023-01-01 , Siti Nor Azreen Ahmad Termizi , Wan Alwi S.R. , Manan Z.A. , Varbanov P.S.

The concept of an eco-industrial park (EIP) that promotes resource sharing, reutilization of waste, and exchange of materials among industries and communities brings significant benefits in terms of environmental, social, and economic aspects. EIP can be accomplished with the aid of blockchain technology to manage data and integration complexity and problem dimensionality. This work proposes the application of blockchain technology in combination with other Industry 4.0 (IR4.0) technologies as enablers for EIP development. We review the international frameworks for EIP and the IR4.0 principles and applications focusing on blockchain technology to evaluate the suitability of blockchain technology integration into the green industrial park concept. An illustrative model of a blockchain-based EIP data management platform has been proposed in this work as a starting point for exploring the full potential of this technology for future EIP applications.

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Kinetics Analysis on Catalytic Pyrolysis of Empty Fruit Bunch (EFB) with Copper Oxide Doped Aluminium Oxide (CuO/Al2O3) Catalyst

2020-12-18 , Alina Rahayu Mohamed , Zin A.M. , Siti Nor Azreen Ahmad Termizi , Khairunissa Syairah Ahmad Sohaimi , Izhar N.I.I.N.

This study focuses on dynamic non-catalytic and catalytic pyrolysis of empty fruit bunch (EFB) with copper oxide doped aluminium oxide (CuO/Al2O3) at linear ramp rates of 10, 15, 20, 25, 30 and 40 Cmin-1 at pyrolysis temperature of 28-1000 C in a thermogravimetric analyzer (TGA). The thermogravimetric profiles for the thermochemical breakdown of EFB under non-catalytic and catalytic pyrolysis with CuO/Al2O3 comprise of three different levels. The kinetics analysis for the reactions were evaluated using the Kissinger and Ozawa methods. The values of activation energy (Ea) for non-catalytic EFB pyrolysis were 167.95 and 177.68 kJmol-1 based on Kissinger and Ozawa methods respectively. For catalytic pyrolysis with approximately 9.09 wt% CuO/Al2O3 catalyst, the values of Ea reduced to 127.72 and 137.42 kJmol-1 by Kissinger and Ozawa methods respectively. These values indicate that the presence of 9.09 wt% CuO/Al2O3 catalyst has successfully reduced Ea value for the EFB pyrolysis reaction.

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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.

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Biomechanical assessment of different surgical approaches of zygomatic implant placement on prosthesis stress

2020-12-18 , Ishak M.I. , Rosli M.U. , 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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