Studies on Boundary Layer Parameters on Rough Surfaces in Turbulent Boundary Layer Zone

At the point when genuine fluid streams past a solid body or a solid boundary wall, the fluid particles adhere to the wall and state of no slip happens. This implies that the velocity of fluid near to the wall will be same as that of wall. On the off chance that the wall is stationary, the speed of fluid at the boundary will be zero. Further far from the limit, the velocity will be higher and as a consequence of this variety of velocity, and gradient of velocity will exist. The speed of fluid increments from zero on the stationary limit to the free stream velocity of the fluid in the direction normal to the boundary. This velocity from zero to free stream velocity in the perpendicular direction to the wall happens in a restricted locale in the region of solid boundary. This narrow locale of fluid is called Boundary Layer. Three fundamental parameters (portrayed underneath) that are utilized to describe the size and state of a boundary layer are the nominal boundary layer thickness, the displacement thickness, and the momentum thickness. In our proposition, we have gotten the boundary layer parameters and velocity profiles on different types of rough surfaces by using wind tunnel. The emery papers of distinctive grain sizes have been considered as rough surfaces. This paper summarizes a select set of recent investigations involving the computations of effects of roughness, mainstream velocity and distance from leading edge on turbulent boundary layer along with the correlations

Utero-ovarian ligament fibroid-an unusual location of extrauterine fibroids

Utero-ovarian ligament fibroids are among the rarest sites for extrauterine leiomyomas. Broad ligament fibroids are relatively common. They can be either asymptomatic or present with chronic pelvic pain and pressure symptoms. They can be confused with an ovarian mass, broad ligament cyst or a pedunculated fibroid. There are high chances of missing it clinically. Ultrasonography, magnetic resonance imaging (MRI) and computed tomography scan are the imaging techniques used to diagnose such conditions, MRI being the most accurate in ruling out other broad ligament masses with suspected ovarian, tubal or isolated broad ligament cyst. Here is a rare case report of a pedunculated extrauterine leiomyoma with its origin in the utero-ovarian ligament

A case report on the rare presentation of aneurysmal bone cyst on proximal radius with management

Aneurysmal bone cyst (ABC) is a non-neoplastic vaso-cystic tumor of the second decade. A 16-year-old male patient presented to the outpatient department with gradual dull aching pain and progressive increasing swelling, which was localized to right lateral elbow and upper part of the forearm. There was no restriction in the range of motion. After getting an x-ray, a lytic lesion is found at the proximal radius. MRI and cytology, are both investigations done to confirm the diagnosis. Two injections of 10 ml polidocanol (3%) were administered percutaneously two months apart under the guidance of an image intensifier. After one year X-ray showed marked sclerotic, however, the tumor size remained almost the same. Although ABC is a non-aggressive benign lesion. ABC responds to treatment very well. recurrence is also common. Proximal radius is a less common site for ABC and the case report suggests that it is curable. We found no recurrence. Treatment with polidocanol is less expensive, less morbid, has a good functional outcome, early discharge from the hospital, and highly effective.

A new closed loop speed control strategy for a vector controlled three- phase induction motor drive

This paper presents a completely mathematical equations based model on control of torque and speed of a three-phase indirect vector controlled VSI fed cage induction motor drive that is controlled through the space vector modulated method. This enables a wide range of acceptability of the model for various values of load and for various types and ratings of induction motors. The uniqueness of the model lies in the fact that the deviations in the torque and speed on sudden application of reference step change in speed values are minimum i.e. when any sudden change in the speed reference is desired, the speed and torque waveforms reveal that the time taken in coming back to their final steady state values is very less and the motor overcomes the perturbation with negligible transients. The same is verified through the simulated results