Srinivasa A.H.,Maharaja Institute of Technology |
Eswara A.T.,P.A. College
International Journal of Heat and Mass Transfer | Year: 2013
This paper deals with unsteady free convection flow of an incompressible fluid about an isothermal truncated cone with variable viscosity and Prandtl number. The non-linear coupled partial differential equations governing the flow and heat transfer have been solved numerically, by using an efficient implicit finite-difference scheme along with quasilinearization technique. The nonsimilar solutions have been obtained for the problem, overcoming numerical difficulties near the leading edge and in the downstream regime for the whole transient from the initial unsteady-state flow to the final steady state flow, for different Prandtl number fluids. Also, an analytical solution is obtained for transient heat transfer at the leading edge of the truncated cone, valid for small times and found to be in good agreement with numerical solution. Numerical results indicate that skin friction as well as heat transfer are strongly affected by the viscosity-variation parameter and temperature dependent Prandtl number. Further, skin friction is found to decrease along the surface of the cone whereas heat transfer rate increases due to unsteadiness in the flow. It is observed that there is a smooth transition from the small time solution (initial unsteady flow) to the large time solution (final steady-state flow). The time taken to reach steady state is found to increase with increasing of Prandtl number. © 2012 Elsevier Ltd. All rights reserved.
Subudhi P.K.,Maharaja Institute of Technology |
Palo S.,Kalam Institute of Technology |
Sahu T.,Berhampur University
Superlattices and Microstructures | Year: 2012
We analyze the strain induced changes in the low temperature multisubband electron mobility mediated through the intersubband interactions in a pseudomorphic GaAs/In xGa 1-xAs coupled double quantum well structure. We consider the non-phonon scattering mechanisms and study the effect of strain on them. We show that strain reduces the mobility due to ionized impurity (imp-) scattering μ imp but enhances the mobility due to interface roughness (IR-) scattering μ IR. For alloy disorder (AL-) scattering as long as the lowest subband is occupied, the effect of strain enhances the mobility μ AL. However, once the second subband is occupied, there is almost no change, rather decrease in μ AL for larger well widths. It is gratifying to note that for single subband occupancy, the effect of strain enhances the total mobility μ. On the other hand, for double subband occupancy, initially there is almost no change, but with increase in well width the total mobility reduces. We vary the In composition x from 0.15 to 0.2 and 0.25 and the barrier width between the two wells to analyze their effects on the mobility which shows interesting results. Our study of multisubband mobility can be utilized for the low temperature device applications. © 2012 Elsevier Ltd. All rights reserved.
Mishra S.R.,Siksha O' Anusandhan University |
Pattnaik P.K.,Maharaja Institute of Technology |
Dash G.C.,Siksha O' Anusandhan University
Alexandria Engineering Journal | Year: 2015
An attempt has been made to study a steady planar flow of an electrically conducting incompressible viscous fluid on a vertical plate with variable wall temperature and concentration in a doubly stratified micropolar fluid in the presence of a transverse magnetic field. The novelty of the present study is to account for the effect of a spanwise variable volumetric heat source in a thermal and solutal stratified medium. The coupled non-linear governing equations are solved numerically by using Runge-Kutta fourth order with shooting technique. The flow characteristics in boundary layers along with bounding surface are presented and analyzed with the help of graphs. © 2015 Faculty of Engineering, Alexandria University. Production and hosting by Elsevier B.V. This is an open access article under the CC BY-NC-ND license.
Geetha Kiran A.,Malnad College of Engineering |
Murali S.,Maharaja Institute of Technology
21st International Conference in Central Europe on Computer Graphics, Visualization and Computer Vision, WSCG 2013 - Poster Proceedings | Year: 2013
Image based video generation paradigms have recently emerged as an interesting problem in the field of robotics. This paper focuses on the problem of automatic video generation of indoor scenes that mainly consist of orthogonal planes. The algorithm infers frontier information directly from the images using a geometric context-based segmentation scheme that uses the natural scene structure in indoor environments. The presence of floor is a major cue for obtaining the termination point for the video generation. First, we perform floor segmentation using dilation and erosion methods. Second, compute the length of the floor using distance method which is used as the termination point for video generation. Finally, video is generated by cropping the image. Our approach needs no human interventions, hence it is fully automatic. We demonstrate the technique to a variety of applications, including virtual walk through ancient time images, in forensics and in architectural sites. The algorithm is tested on nearly 100 images obtained from different buildings, all of them are fairly different in interior decoration themes from each other.
Chethan Y.D.,Maharaja Institute of Technology |
Ravindra H.V.,P.A. College |
gowda Y.T.,Maharaja Institute of Technology |
Bharath Kumar S.,P.A. College
Materials Today: Proceedings | Year: 2015
The automation of the manufacturing process plays an important role in improving productivity. For this, monitoring and diagnostic systems are becoming increasingly necessary in manufacturing. This paper describes A new method, based on a machine vision is proposed to estimate the tool status in cutting inserts in order to identify the time for its replacement. A lathe and a machine vision system have been used to obtain cutting inserts images. A binary image for each of the cutting insert images have been obtained by applying several pre-processing and segmenting operations. Every wear region has been described by means of three features representing the state of the cutting tool viz. wear area; perimeter and compactness are studied here as features and found to be effective in tool condition monitoring. Once all these features are extracted after processing of an image, tool status, whether worn out or not worn out (serviceable), is decided. Test results show that prevalent tool status can be monitored robustly in a real production environment and therefore the manufacturing automation can be improved. © 2015 Elsevier Ltd.