Mass transfer effectiveness on three-dimensional laminar compressible boundary layer flows

The effects of mass transfer on laminar boundary-layer flow with or without slip on an axisymmetric surface of variable cross section in the case of compressible swirling flow are investigated together with the same effects on the laminar compressible boundary-layer flow over a yawed infinite wing in the case of hypersonic flow. The similarity equations governing these two flows are solved by a quasi-linearization technique. Numerical values of the skin-friction and heat-transfer parameters for the axisymmetric surface and yawed infinite wing are tabulated for different values of the mass-transfer and slip parameters

Unsteady laminar boundary layers in a compressible stagnation flow

The unsteady laminar compressible boundary-layer flow in the immediate vicinity of a two-dimensional stagnation point due to an incident stream whose velocity varies arbitrarily with time is considered. The governing partial differential equations, involving both time and the independent similarity variable, are transformed into new co-ordinates with finite ranges by means of a transformation which maps an infinite interval into a finite one. The resulting equations are solved by converting them into a matrix equation through the application of implicit finite-difference formulae. Computations have been carried out for two particular unsteady free-stream velocity distributions: (1) a constantly accelerating stream and (2) a fluctuating stream. The results show that in the former case both the skin-friction and the heat-transfer parameter increase steadily with time after a certain instant, while in the latter they oscillate thus responding to the fluctuations in the free-stream velocity

Three-dimensional laminar compressible boundary layers with large injection

The effect of large mass injection on the following three-dimensional laminar compressible boundary-layer flows is investigated by employing the method of matched asymptotic expansions: (i) swirling flow in a laminar compressible boundary layer over an axisymmetric surface with variable cross-section and (ii) laminar compressible boundary-layer flow over a yawed infinite wing in a hypersonic flow. The resulting equations are solved numerically by combining the finite-difference technique with quasi-linearization. An increase in the swirl parameter, the yaw angle or the wall temperature is found to be capable of bringing the viscous layer nearer the surface and reducing the effects of massive blowing

Boundary-layer flows with swirl and large suction

An analytical solution is presented for the laminar swirling flow in a tube. Attention is given to a particular type of swirling flow corresponding to a zero longitudinal acceleration parameter, with large suction at the surface. The investigation shows that in the case of very large rates of suction the velocity overshoot can be almost eliminated. This is even possible in flows with swirls which are characterized by a velocity overshoot in the longitudinal direction

Laparoscopic Management of Large Ovarian Cysts

ABSTRACT Introduction Large ovarian cysts are conventionally managed by laparotomy. This study was undertaken to assess the feasibility and outcome of laparoscopic surgery for the management of large ovarian cysts. Settings and design Rural teaching hospital – prospective study. Materials and methods Thirty-eight patients from January 2014 to December 2016 presumed to be with large ovarian cyst were managed laparoscopically. Preliminary evaluation suggestive to be of benign ovarian cyst by history, clinical examination, sonographic imaging, and basic serum marker were only included in this study. The cysts were aspirated initially, followed by cystectomy, oophorectomy, or total hysterectomy depending on age, parity, coexisting pathology, and desire for future fertility. Results Out of 38 cases, 6 were nonovarian adnexal masses. Eight of the 32 cases who presented with pain due to torsion were managed on emergency basis; rest of the cases were operated electively. Mean operating time was 90 minutes. Mean size of the cyst was 16 cm. One case of borderline malignancy was detected and the rest showed benign pathology. Six of the cases required minilaparotomy for specimen removal. Most women were successfully treated laparoscopically without any complications, and conversion to laparotomy was required in three cases. Conclusion With proper patient selection and exclusion of malignancy, laparoscopic management of large ovarian cyst by gynecologist is feasible. How to cite this article Beeresh CS, Doopadapalli D, Vimala KR, Lingegowda K. Laparoscopic Management of Large Ovarian Cysts. Int J Gynecol Endsc 2017;1(1):18-21. </jats:sec