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| Articles
by
A.S. Mokhtar |
Total Records (
4 ) for
A.S. Mokhtar |
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F. A. Ansari
,
K.A. Abbas
,
J. Bakar
,
A.O. Ashraf
,
A.S. Mokhtar
and
S.M. Sapuan
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In an earlier study, it was demonstrated that the empirical approach used to calculate
surface film conductance resulted into a higher value compared to those obtained from the other
methods available in the literature. During further investigations, surface film conductance values
were found to gradually decrease with a fall in temperature. When this non-linear variation was used
to develop a correlation and it was used to calculate temperatures by the same empirical correlation,
a remarkably excellent improvement in the calculated temperature resulted. |
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K.A. Abbas
,
F.A. Ansari
,
A.S. Mokhtar
,
A.O. Ashraf
,
M.A. Wan
and
S.M. Sapuan
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The present work aims at finding an optimized finite difference scheme for the solution of
problems involving pure convection heat transfer in slab shaped fresh water fish pieces. A generalized
mathematical model was written in dimensionless form and an optimized scheme of solutions was
worked out. A fully explicit finite difference scheme, an implicit finite difference scheme and different
combination of the two, with varying values of weighing factor were thoroughly studied. All the
possible options of temperature-time grid sizes were considered. It was found that the simplest explicit
finite difference scheme with ten characteristic length division and Fourier number increments one
sixth of the square of the space division size gives best convergence and minimal truncation error.
Numerically computed and measured temperature-time variations were found to have excellent
agreement. |
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A.S. Mokhtar
,
K.A. Abbas
,
S.M. Sapuan
and
M.M.H. Ahmad
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The study presents an attempt to correlate the consumer acceptability of Malaysin Patin fish with the storage time and temperature. A batch of typical fresh fishes were cut into regular slices (samples), which were wrapped and distributed evenly to four cold stores of 0, 3, 5 and 10oC storage temperature for a period of 28 days. During the course of storage, each three days, samples were taken from the stores to be tested chemically and sensorily by trained panelists. A correlation was developed between the consumer's acceptability and the storage time and temperatures via the acidity (pH) test. The correlation was plotted graphically to form simple tool to the fish market retailers by which the quality and the shelf life of the displayed fish could be estimated. |
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F.A. Ansari
,
A.S. Mokhtar
,
K.A. Abbas
and
N.M. Adam
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The present work is to demonstrate how some very simple problems are made mathematically complex and seemingly tedious due to academic or business compulsions. There are some problems in which mathematical model are developed after making many simplifying assumptions. But, when it comes to solving these models, very sophisticated and complex schemes are applied. For such problems, dual policy does not make sense and in many cases the problem may be tackled in a simpler way to get comparable accuracy. The present paper reports one such example. It deals with the development and authentication of computer software for estimating building cooling load. The software is simpler to use, needs fewer input data and is more versatile compared to any other commercially available, exorbitantly costly and extensively used software. The effects of significant building parameters like orientation, window glass shade type, number of glass panes used, wall insulation, roof type and floor type can be easily investigated. Effects of all these parameters have been investigated for a typical building block to arrive at an intelligent decision. With any other software or method, it cannot be made so conveniently. All the above mentioned advantages are without sacrificing accuracy and reliability. |
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