Ajith Kumar
@ww.mite.ac.in
Assistant Professor, Department of Aeronautical Engineering
Mangalore Institute of Technology & Engineering
RESEARCH, TEACHING, or OTHER INTERESTS
Mechanical Engineering, Aerospace Engineering, Anthropology
Scopus Publications
Scholar Citations
Scholar h-index
Scholar i10-index
Scopus Publications
Ajith Kumar S, Damu Murali, and Vignesh Ram Petha Sethuraman
AIP Publishing
A novel and effective hybrid technique, which involves active surface heating strategies in conjunction with the use of passive splitter plates in the wake of the cylinder, is proposed. In this report, we present the results of a numerical investigation on the two-dimensional, laminar mixed convection flow over a circular cylinder with a hot rigid splitter plate attached to it on the wake side. A projection algorithm-based finite volume method is employed to obtain the solution of the coupled, nonlinear governing partial differential equations subjected to Courant–Friedrichs–Lewy conditions. The isothermal heating of the splitter plate under the influence of the gravity field generates an upward buoyancy force in the wake of the cylinder. For different length-to-diameter (L/D) ratios, the effect of heating on aerodynamic, wake, and heat transfer characteristics has been studied for a wide range of parameters; 75 ≤Re≤ 150, 0 ≤Ri≤ 1, and 0.5 ≤L/D≤ 1 at Pr = 0.7. It is observed that the hot splitter plate would bring about conspicuous changes such as asymmetry in the vortex shedding behind the cylinder at low Reynolds numbers. The outcomes demonstrate a notable improvement in convective heat transfer and drag, with gains of up to 7% and 15%, respectively. It is found that the rate of heat transfer and vortex shedding frequency decrease with an increase in L/D ratio. Correlations for the estimation of Strouhal number and Nusselt number have also been proposed which helps provide a more thorough understanding of thermal and aerodynamic features of the hybrid approach.
Santosh Madeva Naik, Vinod Moger, Veeranna Gedigeri, Ajith Kumar, and M. Sreeramulu
Elsevier BV
J. V. Muruga Lal Jeyan, Akhila Rupesh, Sabiha Parveen, and Ajith Kumar
Springer Singapore
Ajith Kumar, Mithul Das, Muhammad Raafid, Rajput Yash, H. R. Praneeth, and Vinod
AIP Publishing
Modern day traffic has led to more pollution causing harm to the environment, thus more emphasis is given on electric vertical take-off and landing aerial vehicle which will have dual mode of transportation both in terrain and air, commonly known as flying cars. Previous concepts of flying cars are taking up lots of space to take off and land. This paper presents a detailed design, fabrication and testing of a prototype of a flying car completely based on green fuel and compact in size. Newly developed flying car will have vertical takeoff and landing capabilities with optimized aerodynamic design for minimum drag at cruise condition. The flying car is incorporated with retractable rotor arms. The aerodynamic optimization and the endurance test of the proposed flying car is carried out under varying cruise velocities in both ground and air. This novel flying car expected to be a potential future technology for green transportation.
M V KiranKumar, M Lokesha, Sujesh Kumar, and Ajith Kumar
IOP Publishing
A Bearing is one of the important components in the Rotary machines and has been widely used in various industries in many of the applications such as shaft mountings, to reduce friction as well as facilitate relative motion between the two components etc. It is therefore very essential to determine the early faults conditions from bearings. There are various methods to detect faults in the bearings, such as vibration monitoring, wear debris monitoring, temperature monitoring, soap techniques, non destructive test etc. Vibration signal analysis may be one of the commonly used techniques for checking the condition and finding faults in bearings. Vibration analysis has been used as a predictive maintenance procedure in the machine maintenance. By adopting appropriate signal processing techniques, changes in vibration signals due to faults can be detected to aid in maintaining the bearings health condition. By detecting and analyzing the machine vibration, it is possible to determine and predict the machine failure. Early fault detection of the bearings is possible by analyzing the vibration signal using different techniques. This paper give a relative of various techniques used for finding the fault in the bearings based on vibration analysis method.
Vinod, Ajith Kumar, B Suresha, M V Kiran Kumar, and S Ramesh
IOP Publishing
The focus of this study was to investigate the effect of carboxylic acid (COOH) functionalized graphene (CGr) content on abrasive wear behavior of epoxy nanocomposites. CGr-reinforced epoxy (CGr//Ep) nanocomposites were fabricated using probe sonicator for dispersion and vacuum oven for curing. The percentage of CGr in the developed composites was varied from 0.2 to 1 wt. % with an increament of 0.2 wt. %. The abrasive wear tests were conducted on the developed CGr/Ep composites on SiC abrasive paper with two grit sizes at constant velocity and constant load for varying abrading distance. The worn surfaces were analyzed using Scanning Electron Microscope and the images reveals that the developes nanocomposites exhibits good tribolofical performance at low filler loading (≤0.6 wt. %). Neat epoxy showed the highest specific wear rate as well as high wear volume. On the other hand, epoxy with 0.6 wt. % of CGr exhibited the least friction coefficient and superior wear resistance for 320 grit SiC abrasive paper. It is predicted that the good interfacial adhesion between CGr and epoxy matrix and also tribo-chemical reactions between CGr layer and epoxy matrix for reducing wear rate of the composite materials.