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RISS 인기검색어
- 검색키워드
- 저자 : Hari Ponnamma Rani (검색결과 4 건)
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Hari Ponnamma Rani,김창녕 한국화학공학회 2009 Korean Journal of Chemical Engineering Vol.26 No.4
The Dufour and Soret effects on the unsteady laminar free convective flow with mass transfer flow past a semi-infinite isothermal vertical cylinder were studied numerically. The governing partial differential equations were converted into a non-dimensional form and solved numerically by applying a Crank-Nicolson type of implicit finitedifference method with a tri-diagonal matrix manipulation and an iterative procedure. For the hydrogen-air mixture, which is a non-chemical reacting fluid, the profiles of the unsteady dimensionless velocity, temperature and concentration are shown graphically for the different values of thermal and mass Grashof numbers, thermal diffusion parameters (Soret numbers) and diffusion-thermo parameters (Dufour numbers). Finally, the simulated values of the average skin-friction coefficient, the average Nusselt number and the average Sherwood number are presented. The numerical results reveal that for an increasing Soret number or decreasing Dufour number, the time to reach the temporal maximum and the steady-state decreases for the flow variables. As the Soret number increases or the Dufour number decreases, both the skin friction and the Sherwood number increase, whereas the Nusselt number decreases.
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김창녕,Hari Ponnamma Rani 한국화학공학회 2010 Korean Journal of Chemical Engineering Vol.27 No.3
The present study deals with the boundary layer flow and heat transfer of unsteady laminar free convection flow past a semi-infinite isothermal vertical cylinder immersed in air. The fluid viscosity is assumed to vary with the temperature. An implicit finite-difference method has been employed to solve the governing non-dimensional boundary layer equations. A parametric study is performed to illustrate the influence of variable viscosity on the velocity and temperature profiles. The numerical results reveal that the viscosity has significant influences on the transient velocity and temperature profiles, average skin-friction coefficient and the average heat transfer rate. The results indicate that as the viscosity parameter increases, the temperature and the skin-friction coefficient increase, while the velocity near the wall and the Nusselt number decrease.
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Exploring LULC changes in Pakhal Lake area, Telangana, India using QGIS MOLUSCE plugin
Ashok Amgoth,Hari Ponnamma Rani,K. V. Jayakumar 대한공간정보학회 2023 Spatial Information Research Vol.31 No.4
Dynamic processes such as environmental, economic, and social factors influence land use and land cover (LULC) changes, with temporal and spatial variations. This study aims to identify changes in LULC and predict future trends in the Pakhal Lake area in Peninsular India. Satellite images for the years from 2016 to 2022 were used for LULC classification using deep learning with Sentinel − 2 imagery in Google Earth Engine (GEE). Dynamic World dataset is used to classify the LULC changes of the study area with a 10 m near-real-time dataset. Images were classified based on six different LULC classes, namely water, vegetation, flooded vegetation, agriculture, built-up area, and bare land. The Cellular Automata–Artificial Neural Network (CA − ANN) technique was used to predict LULC changes. QGIS plugin MOLUSCE with Multi-Layer Perception (MLP), was used to predict and determine potential LULC changes for 2025 and 2028. The overall Kappa coefficient value of 0.78, and an accuracy of 82% indicated good results for LULC changes and projected maps for 2025. Prediction of LULC changes using MLP − ANN for the years 2025 and 2028 showed increase in agriculture, built-up areas, and barren land. The results of the study will be useful to develop better management techniques of natural resources.
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Chang Nyung Kim,Hari Ponnamma Rani 한국화학공학회 2008 Korean Journal of Chemical Engineering Vol.25 No.1
number on unsteady laminar free convection flow over a vertical cylinder. The governing boundary layer equationsare converted into a non-dimensional form and a Crank-Nicolson type of implicit finite-difference method is used tosolve the governing non-linear set of equations. Numerical results are obtained and presented for diferent viscosity-variation parameters and Prandtl numbers. Transient effects of velocity and temperature are analyzed. The heat transfercharacteristics against the viscosity-variation parameter are analyzed with the help of average skin-friction and Nusseltnumber and are shown graphically.
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