Anbar Journal of Engineering Sciences

The presented work investigates the effect of addition admixture (cement kiln dust) to
concrete as a partial replacement of cement weight. Cement kiln dust was added by
(10,30,50)% of cement weight.Four mixes were selected, three of them contain cement kiln
dust (CKD) and one reference mix without any admixture for ages (7,28,90) days.
Compressive strength ,flexural strength, ultra-sound velocity (UPV), slump, splitting tensile
strength and static modulus of elasticity were tested.The test results indicated that the use of
(CKD) led to significant decreasing in concrete strength in general and this decreasing
increases with the increasing of (CKD), for example at 28 day the compressive strength of
reference concrete (A) was 35 MPa, while the compressive strength of (B,C,D) contain
(10,30,50)%CKD were (28,25,22) MPa respectively

The aerodynamic characteristics of forward swept wing were studied theoretically and
experimentally .In the present work, theoretically a computer program was constructed to
predict the pressure distribution about surface of the wing using three dimensional Low Order
Subsonic Panel method. The aerodynamic coefficients of the wing were calculated from the
pressure distribution which gained from tangential velocities Experimentally ,test were
carried out by designing and manufacturing a wing model with special arrangement for
pressure tapping, suitable for low wind tunnel testing. The entire wing was rotated rotate
about an axis in the plane of symmetry and normal to the chord to produce different sweep
and incidence angles for wing, by using rotating mechanism. Wind tunnel test was carried out
at (U∞=33.23m/s) for different swept angles and angles of attack.
Comparisons were made between the predicted and experimental results. It is good and gave
reasonable closeness. It was clear from the present investigation that the lift and drag
characteristics for the forward swept wing are less in values compared with the swept back
wing, therefore a forward swept wing can fly at higher speed corresponding to a pressure
distribution associated for lower speed.

Natural convection heat transfer in two-dimensional region formed by constant heat
flux horizontal flat tube concentrically located in cooled horizontal cylinder studied
numerically. The model solved using the FLUENT CFD package. The numerical simulations
covered a range of hydraulic radius ratio (5, 7.5, and 10) at orientation angles from (0
o
up to
90o
).
The results showed that the average Nusselt number increases with hydraulic radius
ratio, orientation angles and Rayleigh number. As well as enhancement ratio for Nusselt
number at orientation angle 90o and hydraulic radius ratio 7.5 equal 24.87%. Both the fluid
flow and heat transfer characteristics for different cases are illustrated velocity vectors and
temperature contours that obtained from the CFD code. The results for the average Nusselt
numbers are compared with previous works and show good agreement.

The increase in traffic volumes at intersections is one of the important problems that
makes difficulties in the traffic movement then leads to traffic congestion in these facilities.
The objective of the present study is improvement the traffic operation of the selected
intersection (Al-Zeoat intersection) in Al-Ramadi city by analysis and evaluation this
intersection and using accepted solutions to improve the traffic operation of Al-Zeoat
intersection under local exist conditions and present a best proposal to enhance the
performance at the intersection.
To achieve these objectives, the traffic volumes data collection and geometric layout for AlZeoat intersection that required for the traffic and geometrical analysis were gathered
manually, while SIDRA traffic program is used for the requirements of traffic analysis
process.

In recent years, the elastomer forming technique has found acceptance on the shop floor
and is used increasingly as a pressure- transmitting medium for various metal-forming
operations. This is due mainly to the introduction of a new range of materials and of new
concepts in tooling, which have served to kindle industrial interest in the process.
The purpose of this paper is to study the sheet formability with compressible die (natural
rubber). The forming was occurred using hemi-spherical punch and rubber die. Experimental
tests were used to know the mechanical properties for rubber and sheet materials which were
brass and aluminum. After that several forming processes were prepared with a 58 mm
diameter steel ball as a punch to form 0.5 thickness brass and aluminum dishes with different
diameters (15-40 mm). Force-stroke history was plotted through forming to find the stiffness
of formed plate with rubber die and later to compare this parameter for different diameters.
Wrinkling and springback were pointed for the formed dishes. It was found that the stiffness
of the formed dish increases with diameter until reaching to the diameter at which wrinkling
will takes place (about 33 mm for aluminum and 28mm for brass), and then the stiffness will
decreases with diameter above this value. It was found that the springback ratio (ratio of final
high to the stroke) was increased with diameter until wrinkling takes place, and this ratio is
greater for aluminum than that for brass.

Fire clay are directly into kaolin with different weight percent. Density, shrinkage , water
adsorption properties were studies at )1000C0 ( and )1200C0
( . All samples pressed under (10
tan) . The results showed that the fire clay increase density , at the same time decrease the
shrinkage and water adsorption .