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Effect of Ag loading on praseodymium doped ceria catalyst for soot oxidation activity
Pandurangappa Govardhan,Anjana Payyalore Anantharaman,Sunaina Shivasharanappa Patil,Hari Prasad Dasari,Harshini Dasari,Atmuri Shourya 한국화학공학회 2022 Korean Journal of Chemical Engineering Vol.39 No.2
Silver-loaded praseodymium doped ceria (XAg/PDC) was synthesized by microwave-assisted co-precipitation and wetness impregnation. XRD confirms the fluorite structure of ceria without secondary phase, and Raman spectroscopy represents the increased generation of oxygen vacancies with Ag loading. The TEM analysis shows lattice fringes corresponding to both CeO2 and Ag on the surface. The BET and BJH analysis of catalyst confirms the high porosity accompanied by high surface area and pore diameter of 5Ag/PDC and 15Ag/PDC, making it more active for the oxidation reaction. From the XPS analysis the amount of surface Ce3+ concentration and the surface chemisorbed oxygen species (O2 2) is high for 5Ag/PDC and 15Ag/PDC, in line with XRD and Raman results. The soot oxidation T50 temperature follows the trend: 5Ag/PDC~15Ag/PDC>10Ag/PDC>20Ag/PDC>0Ag/PDC. The Ag loading increased the surface reducibility of cerium ions and thus 5 wt% was optimized.
Effect of Axial Spacing between the Components on the Performance of a Counter Rotating Turbine
Subbarao, Rayapati,Govardhan, Mukka Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.4
Counter Rotating Turbine (CRT) is an axial turbine with a nozzle followed by a rotor and another rotor that rotates in the opposite direction of the first one. Axial spacing between blade rows plays major role in its performance. Present work involves computationally studying the performance and flow field of CRT with axial spacing of 10, 30 and 70% for different mass flow rates. The turbine components are modeled for all the three spacing. Velocity, pressure, entropy and Mach number distributions across turbine stage are analyzed. Effect of spacing on losses and performance in case of stage, Rotor1 and Rotor2 are elaborated. Results confirm that an optimum axial spacing between turbine components can be obtained for the improved performance of CRT.
Hariharan, Chinnasamy,Govardhan, Mukka Korean Society for Fluid machinery 2013 International journal of fluid machinery and syste Vol.6 No.3
While performing numerical simulations, it is general industrial practice to neglect the clearance gap between the impeller and the inlet duct. In the present work, the effect of clearance gap on the performance of an industrial sized centrifugal blower is simulated for two volutes of width ratios and various flow coefficients. The results show that the clearance has a positive effect at low mass flow rates. This is observed in the pressure rise (1.3%) as well as in efficiency (0.7%). At higher mass flow rates, it has a negative effect with a drop in efficiency of 1% and pressure drop of about 1.4%. The effect of clearance gap on volute with higher width ratio is smaller when compared with the volute with smaller width ratio.
A Novel Approach For Component Classifications And Adaptation Using JALTREE Algorithm
Jalender, B.,Govardhan, Dr. A International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.2
Component adaptation is widely recognized as one of the main problems of the components, used in component based software engineering (CBSE). We developed methods to adjust the components classified by the keywords. Three main methods are discussed in this article those methods are combined with several domain component interfaces, high level simple notation for the adapter design patterns. The automated process for classifying high-level components are using adaptation is novel to software engineering domain. All Specifications and many technologies for re-using software, CBD and further developments have been emerged in recent years. The effects of these technologies on program quality or software costs must be analyzed. The risk concerns a single technology and must identify its combinations. In this paper, we are going to discuss the methods to adapt components of different technologies
A Novel Black Box Approach For Component Adaptation Technique
Jalender, B.,Govardhan, Dr. A. International Journal of Computer ScienceNetwork S 2022 International journal of computer science and netw Vol.22 No.2
There are several ways to improve software performance by using existing software. So, the developments of some programs are the most promising ways. However, traditional part programming studies usually assume that the components are recycled "as is". Existing models of component objects only provide limited support for partial adjustments, namely white box technologies ( copy-paste & inheritance) and the black-box methods (such as mixing and encapsulation). These technologies have problems related to recovery, efficiency, implementation of indirect costs, or their own problems. This paper suggests as JALTREE, The Black Box adaptation technology, which allows us for the implementation of previous components, but we need configurable the interface types, for measuring the adaptability. In this article we discussed the types of adjustments including component interfaces and component composition. An example of customizing JALTREE and component can be illustrated in several examples
Improvement in stable operating range of a centrifugal compressor with leaned diffuser vanes
S. M. Gunadal,M. Govardhan 대한기계학회 2019 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.33 No.11
The stable operating range of the centrifugal compressor is limited by stall or surge at lower mass flow rates and by choke at higher mass flow rates. The type of diffuser used has a strong influence on the performance of a centrifugal compressor. This paper presents a numerical investigation of the effect of the leaned vanes in the low solidity vaned diffuser on the stable operating range of a centrifugal compressor. The vanes in the low solidity vaned diffuser were leaned in the direction of impeller rotation by reducing their inlet angle from hub to shroud uniformly. Four cases of leaned vaned diffusers were configured downstream of the same impeller with different lean magnitude. The compressor stage with 6 o leaned vaned diffuser gave an improvement of 19.3 % and 12.2 % in the stall margin and the operating range, respectively, over the stage with low solidity vaned diffuser.
Chinnasamy Hariharan,Mukka Govardhan 한국유체기계학회 2013 International journal of fluid machinery and syste Vol.6 No.3
While performing numerical simulations, it is general industrial practice to neglect the clearance gap between the impeller and the inlet duct. In the present work, the effect of clearance gap on the performance of an industrial sized centrifugal blower is simulated for two volutes of width ratios and various flow coefficients. The results show that the clearance has a positive effect at low mass flow rates. This is observed in the pressure rise (1.3%) as well as in efficiency (0.7%). At higher mass flow rates, it has a negative effect with a drop in efficiency of 1% and pressure drop of about 1.4%. The effect of clearance gap on volute with higher width ratio is smaller when compared with the volute with smaller width ratio.
Performance Improvement of a Centrifugal Compressor Using Partial Vaned Diffusers
S. M. Gunadal,M. Govardhan 한국유체기계학회 2020 International journal of fluid machinery and syste Vol.13 No.1
The type of diffuser used has a strong influence on the performance of a centrifugal compressor. However, the knowledge about the influence of partial vaned diffusers is limited. In the present study two types of partial vaned diffusers, one with partial vanes fixed to the hub wall (hub vaned diffuser), and the other with the partial vanes fixed to the shroud wall (shroud vaned diffuser) are explored and their influence on the compressor stage performance is analyzed numerically. Besides the vane height is varied and the performances investigated over the entire operating range. The results show that, the performance of the shroud vaned diffuser is better than both the vaneless diffuser and the hub vaned diffuser.
Effect of Axial Spacing between the Components on the Performance of a Counter Rotating Turbine
Rayapati Subbarao,Mukka Govardhan 한국유체기계학회 2013 International journal of fluid machinery and syste Vol.6 No.4
Counter Rotating Turbine (CRT) is an axial turbine with a nozzle followed by a rotor and another rotor that rotates in the opposite direction of the first one. Axial spacing between blade rows plays major role in its performance. Present work involves computationally studying the performance and flow field of CRT with axial spacing of 10, 30 and 70% for different mass flow rates. The turbine components are modeled for all the three spacing. Velocity, pressure, entropy and Mach number distributions across turbine stage are analyzed. Effect of spacing on losses and performance in case of stage, Rotor1 and Rotor2 are elaborated. Results confirm that an optimum axial spacing between turbine components can be obtained for the improved performance of CRT.