Print ISSN: 1681-6900

Online ISSN: 2412-0758

Keywords : Encased


Numerical Study of Forced Convection in Wavy and Diverged-Converged Ducts

Anmar M. Basheer; Sattar J. Habeeb; Waheed S. Mohamad; Qutaiba G. Majeed; Mohammed Y. Fattah; Jawad K.Oleiwi; Mohammed S. Hamza; Mayyadah Sh. Abed; Amjed J. Hamidi; Ahmed Alaa Ogla; Yaser Nabeel Ibrahem

Engineering and Technology Journal, 2009, Volume 27, Issue 7, Pages 1385-1403

A three-dimensional study of developing fluid flow and heat transfer through
wavy and diverged-converged ducts were studied numerically for a Prandlt number 0.7
and 5.85 and compared with flow through corresponding straight duct. The Navier-
Stokes and energy equations are solved by using control finite volume method.
Development of the Nusselt number in wavy and diverged-converged ducts are
presented for different flow rates (50

Keywords

forced convection
---
numerical study
---
wavy duct
---
diverged-converged duct

Behaviour of Encased Floating Stone Columns

Qutaiba G. Majeed; Mohammed Y. Fattah

Engineering and Technology Journal, 2009, Volume 27, Issue 7, Pages 1404-1421

In this paper, the finite element method is utilized as a tool for carrying out different
analyses of stone column–soil systems under different conditions. A trial is made to
improve the behaviour of stone column by encasing the stone column by geogrid as
reinforcement material .
The program CRISP2D is used in the analysis of problems. The program adopts the
finite element method and allows prediction to be made of soil deformations considering
Mohr–Coulomb failure criterion for elastic-plastic soil behaviour.
A parametric study is carried out to investigate the behaviour of ordinary and
encased floating stone columns in different conditions. Different parameters were studied to
show their effect on the bearing improvement and settlement reduction of the stone column.
These include the length to diameter ratio (L/d), shear strength of the surrounding soil and,
the area replacement ratio (as) and others.
It was found that the important increase in strength of stone column occurs when it
is encased by geogrid for (length/diameter) L/d = 8 while in case of L/d = 4, a slight
increase in the bearing improvement ratio at the early stages of applying the load is
obtained and then the value of (q/Cu) for both ordinary and encased stone columns is the
same.