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34 results on '"Mohammad, Nurul Farahain"'

14. Optimization of supercritical fluid extraction of asiaticoside from Centella asiatica using Central Composite Design (CCD).

Author

Ruslan, Fatin Shazwani, Susanti, Deny, Taher, Muhammad, and Mohammad, Nurul Farahain

Subjects
CENTELLA asiatica, SUPERCRITICAL fluid extraction, FACTORIAL experiment designs, SUPERCRITICAL carbon dioxide, SOLVENT extraction
Abstract

The extraction of asiaticoside was performed using supercritical fluid extraction to produce highly concentrated extracts. The effects of three factors (co-solvent percentage, pressure, and temperature) on the asiaticoside content were screened using the Two-Level Factorial design and optimized using the Central Composite Design. Asiaticoside was extracted following the treatment combinations of three parameters, namely co-solvent (5–15%), temperature (70–90°C), and pressure (1–20 MPa). The optimized extraction parameters were identified at 10%, 10.5 MPa, and 80°C for co-solvent percentage, pressure, and temperature, respectively. [ABSTRACT FROM AUTHOR]

Published
2021
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27. MHD Forced Convective Flow past a Vertical Plate: An Automated Solution Approach.

Author

Mohamad Asimoni, Nor Raihan, Mohammad, Nurul Farahain, Mohd Kasim, Abdul Rahman, and Shafie, Sharidan

Subjects
*CONVECTIVE flow, *FLUIDS, *MAGNETIC fields, *VELOCITY, *TEMPERATURE
Abstract

The forced convection flow in incompressible viscous fluid past a vertical plate is investigated with the effect of magnetic field. The governing equations are solved numerically using automated solution technique which is FEniCS. It is shown that the increasing of magnetic field strength lead to decrease the velocity but increase the temperature for cooled plate. Meanwhile for heated plate, increasing magnetic field strength lead to decrease the velocity and the temperature of the fluid. [ABSTRACT FROM AUTHOR]

Published
2018
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28. Effect of MHD on unsteady boundary layer flow past a sphere

Author

Mohammad, Nurul Farahain; Department of Mathematical Sciences, Universiti Teknologi Malaysia, Kasim, Abdul Rahman Mohd; Department of Computational and Theoretical Sciences, International Islamic University Malaysia Kuantan, Ali, Anati, Shafie, Sharidan, Mohammad, Nurul Farahain; Department of Mathematical Sciences, Universiti Teknologi Malaysia, Kasim, Abdul Rahman Mohd; Department of Computational and Theoretical Sciences, International Islamic University Malaysia Kuantan, Ali, Anati, and Shafie, Sharidan

Abstract

Magnetohydrodynamics (MHD) is a field of study which dealing with understanding the dynamic of fluid under the influence of magnetic presence. The effect of MHD in a fluid flow has the potential in controlling the separation of flow, optimizing the heat transfer involved or manipulate the velocity of fluidflow. In this paper, the separation times and flow characteristics of a viscous fluid flow past a sphere are investigated in the presence of magnetic field. In order to solve this problem, the dimensional equations that govern the fluid flow and heat transfer are transformed into dimensionless equations by usingappropriate dimensionless variables. The stream functions are introduced to connect and thus having a function that can represent both velocity u and v. Similarity variables are used to deduce the dimensionless governing equations into a system of nonlinear partial differential equations. This system of equations is solved numerically by using numerical scheme known as the Keller-Box method. The results attained are presented graphically and in tabular form

Published
2013

34. Mixed convection flow of viscoelastic fluid over a sphere with constant heat flux.

Author

Mohd Kasim, Abdul Rahman, Mohammad, Nurul Farahain, Aurangzaib, and Shafie, Sharidan

Subjects
*VISCOELASTICITY, *FLUID dynamics, *MATHEMATICAL constants, *HEAT flux, *BOUNDARY layer equations, *NEWTONIAN fluids, *BOUNDARY value problems
Abstract

In this paper, the mixed convection boundary layer of a viscoelastic fluid past a sphere with constant surface heat flux is discussed. The boundary layer equations of viscoelastic fluid are an order higher than those for the Newtonian (viscous) fluid and the adherence boundary conditions are insufficient to determine the solution of these equations completely. Therefore, the augmentation an extra boundary condition is needed in order to solve this problem. The governing non-similar partial differential equations are transformed into dimensionless forms and then solved numerically using the Keller-box method by augmenting an extra boundary condition at infinity. The comparisons of the results obtained in the present work with previous publication are found in excellent agreement with previous publication. Result on the effects of the viscoelastic parameter, K and mixed convection parameter, λ on the velocity and temperature profile have been shown graphically and discussed. [ABSTRACT FROM AUTHOR]

Published
2013
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