Showing papers by "Naveen Kumar published in 2018"
05 Nov 2018
TL;DR: In this article, the authors present the developments about the use of alternative fuels in diesel engines and describe the research directions on production and use of Alternative fuels in off-road and transport vehicles powered by diesel engines.
Abstract: The world at present is mainly dependent upon petroleum-derived fuels for meeting its energy requirement. However, perturbation in crude prices, which concerns about long-term availability of these fuels coupled with environmental degradation due to their combustion, has put renewable alternative fuels on the forefront of policy maker’s agenda. The diesel engines are considered workhorse in the global economy due to better thermal efficiency, ruggedness, and load carrying capacity. They, however, are also the main contributor to air pollution as they emit more oxides of nitrogen, suspended particulate matter as compared to gasoline engines. The most potential fuel either to supplement or to substitute diesel is biodiesel, butanol, producer gas, dimethyl ether, hydrogen, and so on. This chapter presents the developments about the use of alternative fuels in diesel engines. The exhaustive literature has evolved the main trends in the development of alternative fuels around the world. The chapter also describes the research directions on production and use of alternative fuels in off-road and transport vehicles powered by diesel engines.
13 citations
TL;DR: In this paper, the important physico-chemical properties of different ternary blends of diesel, waste cooking oil (WCO) and biodiesel were investigated. But, the authors did not consider the effect of diesel pollution on the quality of the biodiesel.
Abstract: Diesel is extensively used in India, however, also contribute to pollution. In this study, important physico-chemical properties of different ternary blends of diesel, waste cooking oil (WCO) biodi...
6 citations
TL;DR: In this paper, the authors present limited information available about ignition delay and its importance and show that longer ignition delay results in higher in-cylinder temperature which causes higher NOX emission.
Abstract: Longer ignition delay results in higher in-cylinder temperature which causes higher NOX emission. However, limited information available about ignition delay and its importance. In the present work...
4 citations
TL;DR: In this paper, the physicico-chemical properties of JEE were determined using acid catalysed transesterification method and performance, emission and heat release analysis of different blends were carried in a single cylinder diesel engine.
Abstract: Ethyl ester of Jatropha oil (JEE) was prepared using acid catalysed transesterification method. The physico-chemical properties of JEE were determined. Blends of JEE were prepared with 5%, 10%, 15% and 20% butanol on volumetric basis. Performance, emission and heat release analysis of different blends were carried in a single cylinder diesel engine. Brake thermal efficiency (BTE) with JEE and its blends was higher than diesel. The emissions of CO, NOx, and smoke for JEE and blends were lower while emission of HC was higher than diesel. The peak heat release rate for diesel and JEE100 were 135.41/°CA and 93.81 J/°CA.
2 citations
09 Nov 2018
TL;DR: In this article, the authors performed a numerical study of forced convection heat transfer in a square enclosure with four identical stationary cylinders with single inlet and outlet ports, where the ratio of the diameter of the cylinder to the length of the enclosure is kept constant at 0.1 with a fixed spacing between the cylinders.
Abstract: This paper performs a numerical study of forced convection heat transfer in a square enclosure with four identical stationary cylinders with single inlet and outlet ports. The ratio of the diameter of the cylinder to the length of the enclosure is kept constant at 0.1 with a fixed spacing between the cylinders. The enclosure walls are adiabatic while the cylinders are maintained at a constant temperature. The governing equations are solved for laminar, steady state and incompressible flow for different fluids namely air, water, and ethylene glycol. The study aims to determine the effect of varying Reynolds number (5 ≤ Re ≤ 100) and fluid properties (0.7 ≤ Pr < 200) on heat transfer rate and flow characteristics. The results of the study are presented in terms of streamlines, isotherm contours, and surface-averaged Nusselt numbers. The 2-D modeling and simulation have been conducted using ANSYS 16.0.
1 citations