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All Journal International Journal of Aviation Science and Engineering Chemical Engineering Journal Storage (CEJS)
Haider, Bilal
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Aerospace Engineering Automotive Engineering Chemical Engineering, Chemistry & Bioengineering Electrical & Electronics Engineering Mechanical Engineering Transportation

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Comparative Removal of Chromium Cr(VI) from Wastewater by Sawdust and Activated Charcoal Derived from Acacia and Sheesham Wood Ahmad, Shoaib; Haider, Bilal; Ahmad, Hafiz Bilal; Shafeeq, Amir
Chemical Engineering Journal Storage (CEJS) Vol. 4 No. 6 (2024): Chemical Engineering Journal Storage (CEJS)-December 2024
Publisher : LPPM Universitas Malikussaleh

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.29103/cejs.v4i6.19191

Abstract

This study investigates the removal of Chromium (VI) (Cr(VI)) ions from simulated wastewater using various adsorbents. The experiment employs unmodified sawdust (UMSD) and modified sawdust (MSD), along with activated charcoal (AC) derived from Acacia and Sheesham (Dalbergia Sissoo) wood. Batch experiments were conducted to assess the impact of several parameters including solution pH, adsorbent dosage (g/250 mL), contact time (minutes), and initial Cr(VI) concentration (ppm) on Cr(VI) adsorption at room temperature and pressure. SEM along with EDX as well as FTIR were used to analyze the adsorbent surface chemistry. The results revealed that AC exhibited the maximum Cr(VI) removal efficiency (90%) from the simulated wastewater due to its larger surface area as compared to UMSD (55%) and MSD (78%). Models of Freundlich and Langmuir isotherms were used to assess the adsorption process. Analysis of the model constants indicated that the Freundlich isotherm better described the experimental data for all adsorbents, as evidenced by the high correlation coefficient (R² = 0.99).
Effects of Transition Strip on Aerodynamic Yaw Derivatives of MULDICON Wing using an Oscillating Rig at Various Angle of Attack Haider, Bilal; Mansor, Shuhaimi; Mat, Shabudin; Wan Omar, Wan Zaidi; Nasir, Nazri
International Journal of Aviation Science and Engineering - AVIA Vol. 6 No. 1: (June, 2024)
Publisher : FTMD Institut Teknologi Bandung

Show Abstract | Download Original | Original Source | Check in Google Scholar | DOI: 10.47355/avia.v6i1.97

Abstract

This paper presents the effects of the passive flow control technique using transition strips on the transient aerodynamic stability derivative measured on the MULDICON AVT251 wing. The experiments were performed at two configurations; clean wing configuration and the transition strips attached to wing leading edge. MULDICON wind tunnel model was designed and fabricated in UTM based on the AVT251 design. The dynamic measurements were carried out in the Universiti Teknologi Malaysia Aerolab wind tunnel for Reynolds number of 0.3x106 & 0.475x106. MULDICON model was confined to oscillate with a single degree of freedom in yawing motion. The aerodynamic stability derivatives &  are measured as aerodynamic stiffness and damping by extracting the stiffness and damping of the dynamic oscillating rig system. Springs of different stiffness are used to vary the oscillation frequencies with the reduced frequency range of 0.004-0.08. The unsteady aerodynamics effects are examined for both wing configurations. The angle of attack varies from α = 0° to 20° by comparing the transient measurements from the dynamic UTM-LST to the steady-state wind tunnel measurements. The dynamic results indicate that the aerodynamic stiffness derivative is not constant and exceeds the static values and strongly correlates with reduced frequency. The aerodynamic damping derivative is a function of reduced frequency as the damping derivatives become more negative with the increase of the reduced frequency. The amplification factor for the stiffness derivative is above unity which indicates that the steady-state derivative is under-predicted.
Co-Authors Ahmad, Hafiz Bilal Ahmad, Shoaib Mansor, Shuhaimi Mat, Shabudin Nasir, Nazri Shafeeq, Amir Wan Omar, Wan Zaidi