Vasavi College of Engineering

About: Vasavi College of Engineering is a based out in . It is known for research contribution in the topics: Scheduling (computing) & Image compression. The organization has 264 authors who have published 333 publications receiving 1770 citations.

An experimental investigation on the performance and emission characteristics of a diesel engine fuelled with rice bran biodiesel and ethanol blends.

Abstract: This research is aimed to investigate experimentally the performance, and exhaust emission characteristics of a direct injection (DI) diesel engine when fuelled with rice bran oil biodiesel (RBD) and its 2.5%, 5%, and 7.5% ethanol blends over the entire load range. The experimental test results showed that the maximum brake thermal efficiency was obtained with 2.5% ethanol blended with RBD and are 6.98% and 3.93% higher than that of diesel fuel (DF) and biodiesel, respectively, at full load of the engine. Among the ethanol blends the minimum brake specific fuel consumption of 0.339 was observed with 2.5% ethanol. The exhaust gas temperature of the biodiesel was reduced by the ethanol blending. The lowest carbon monoxide, hydrocarbons and unused oxygen emissions were recorded with 2.5% ethanol blend. The smoke of the biodiesel was reduced by 20% when blended with 7.5% of ethanol. The intensity of sound with biodiesel and its ethanol blends was lower than that of DF at full load of the engine. The maximum r...

Finite element modeling for maximum temperature in friction stir welding and its validation

Abstract: Friction stir welding is a relatively new joining process, which involves the joining of metals without fusion or filler materials. The amount of the heat conducted into the workpiece dictates a successful process which is defined by the quality, shape, and microstructure of the processed zone, as well as the residual stress and the distortion of the workpiece. The amount of the heat gone to the tool dictates the life of the tool and the capability of the tool to produce a good-processed zone. Hence, understanding the heat transfer aspect of the friction stir welding is extremely important, not only for the science but also for improving the process. Many research works were carried out to simulate the friction stir welding using various software to determine the temperature distribution for a given set of conditions in weldments. Very few attempted to determine the maximum temperature by varying the input parameters using ANSYS. The objective of this research is to develop a finite element simulation with improved capability to predict temperature evolution in stainless steel. The simulation model is tested with existing experimental results obtained by Zau et al. on 304 L stainless steel. The results of the simulation are in good agreement with that of experimental results. The peak temperature obtained was 1,056.853°C, which was much less than the melting point of 304 L steel (1,450°C). Error analysis is done between theoretical values for 304 L steel obtained from ANSYS and experimental values obtained by Zhu. Mean relative error is calculated between theoretical values for 304 L steel and experimental values.

Influence of welding processes on microstructure and mechanical properties of dissimilar austenitic-ferritic stainless steel welds

Abstract: Dissimilar metal welding of austenitic (AISI 304)-ferritic (AISI 430) stainless steel has been taken up to understand the influence of the welding process on microstructure and mechanical properties. Fusion welding processes, namely, gas tungsten arc welding (GTAW), electron beam welding (EBW), and friction welding, have been employed. The GTAW and EBW processes were selected to understand the heat input effects, while friction welding was included to compare fusion and solid-state welding processes. The material used for fusion welding studies is 20-mm-thick, hot-rolled, and annealed plate. Rods of 18 mm diameter machined from the same plate material were used for friction welding studies. In GTAW, ER 430 filler material was employed for dissimilar metal combination, while other welds are autogenous. Gas tungsten arc welds consisted of coarse columnar grains. In electron beam welds, the microstructure consisted of predominantely equiaxed grains on the austenitic stainless steel side, while colum...