Adama University

About: Adama University is a education organization based out in Nazrēt, Ethiopia. It is known for research contribution in the topics: Population & Adsorption. The organization has 840 authors who have published 1010 publications receiving 5547 citations. The organization is also known as: Adama Science and Technology University & ቴክኖሎጂ ዩኒቨርሲቲ, አዳማ ሳይንስና ቴክኖሎጂ ዩኒቨርሲቲ.

Influence of Nanoparticles Addition on Performance of CSOME in DI CI Engine

Abstract: In this work it is aimed to test the performance of cotton seed oil biodiesel with cerium oxide (CeO2) nanoparticles as additive. This work goes through the various stages like production of biodiesel, addition of nanoparticles with the biodiesel-diesel blends in different proportion using ultrasonicator, testing the effect of nano additives on physiochemical properties of the fuel blend, testing the stability of fuel blend with nano particles, testing the performance and exhaust emission in diesel engine. The blends B10 (90% diesel and 10% biodiesel in volume), B20 (80% diesel and 20% biodiesel in volume), B20+50ppm (80% diesel and 20% biodiesel and 0.05 gm/l cerium oxide) in volume, B20+100ppm (80% diesel and 20% biodiesel and 0.1 gm/l cerium oxide) in volume, B25 (75% diesel and 25% biodiesel) in volume were prepared. From the performance test results, the cotton seed oil fuel blended with cerium oxide shows increment in brake power 4.5kW 4.68kW and brake torque of 18.43 Nm and 18.52 Nm with 50 ppm and 100 ppm respectively. Addition of CeO2 improved exhaust emission compared to pure diesel (B0). The brake specific fuel consumption of cotton seed fuel blended with cerium was decreased compared to the diesel. Generally, it may be concluded from the experimental investigation that the cotton seed oil biodiesel fuel blended with cerium oxide nanoparticle can become a good alternative to petro-diesel.

Analysis of Traffic Evolution on Road Networks of a Roundabout

Abstract: In this paper, the analyses of traffic evolution on the road network of a roundabout having three entrances and three exiting legs are conducted from macroscopic point of view. The road networks of roundabouts are modeled as a merging and diverging types and junctions. To study traffic evolution at junction, two cases have been considered, namely, demand and supply limited cases. In each case, detailed mathematical analysis and numerical tests have been presented. The analysis in the case of demand limited showed that rarefaction wave fills the portion of the road network in time. In the contrary, in supply limited case, traffic congestion occurs at merging junctions and shock wave propagating back results in reducing the performance of a roundabout to control traffic dynamics. Also, we illustrate density and flux profiles versus space discretization at different time steps via numerical simulation with the help of Godunov scheme.

Design Improvement of MacPherson Strut Suspension System for Lighter Vehicle

Abstract: This paper presents a design of a MacPherson strut suspension system for Bajaj Qute four-wheeler small vehicles. Data collection was done using different methods. Then, CAD modelling of the structure was made by using the data recorded from the existing vehicle suspension system. Then, the design of each component of MacPherson strut and existing suspension system was made using CATIA V5 software. Also, an analytical analysis was performed for analysis of the improved suspension system for the required results and FEA was done with ANSYS. The new models become safe than the existing in all aspects. So, the problem in the lateral direction which is flexible camber curve is solved, because the MacPherson suspension system has good camber curve not as flexible as other suspension system and also the stress in the existing system leads the system to have flexible camber; this is corrected in the new model. Also, the steering arm position is corrected to the middle of the knuckle to balance the steering force distribution. The vehicle also has lower ground clearance which is 180 mm when the vehicle is unloaded; with this ground clearance, it is difficult to drive in unpaved road. So, in this design, the ground clearance of the vehicle is increased to 220 mm. Therefore, the vehicle can be driven in all road conditions. It is found that as per the analysis done, the newly designed MacPherson suspension system is safe and performing better than the existing system.