P. Dinesha

Manipal Institute of Technology, Manipal Academy of Higher Education · Mechanical and Industrial Engineering

Spark ignition (SI) engines have been a major contributor from the transportation sector towards the increased emissions to the environment. Modifications to the SI engine like structural modifications, pre, and post-combustion treatments have been investigated in the literature. The use of oxygenated additives to gasoline fuel has been major resea...

Hydrogen peroxide (H2O2) is an excellent oxidant carrier that finds its use in combustion and fuel applications. In the present study, H2O2 (30% assay) is used as an emulsifier in waste cooking oil biodiesel blend (B20) and the emissions and performance in a compression ignition engine are assessed. Along with the neat B20, three blends of B20 with...

In this study, the combined synergetic influence of H2O2 emulsification with the addition of multi-walled carbon nanotubes (MWCNT) to B20 biodiesel blend is ascertained on the exhaust emissions and performance of a compression ignition engine. Methyl ester obtained from waste cooking oil is used to prepare B20 blend. Variation in the concentrations...

The use of biodiesel in a compression ignition (CI) engine has shown to be a promising alternative to conventional diesel owing to its ability to substantially reduce carbon and hydrocarbon emissions. However, an increase in the NOx due to the additional oxygen content from the fuel has led to different fuel pretreatment and exhaust gas after-treat...

This study conducts an experimental investigation of spark ignition (SI) engine characteristics using gasoline blended with Acetone-Butanol-Ethanol (ABE) that act as hydrogen and oxygen carriers. The number of experiments is planned and executed according to a design of experiments with full-factorial design, wherein ABE blend percentage and speed...

The increasing energy demand and the need to reduce emissions have propelled the use of bioenergy and biofuels. Although carbon emissions can be significantly reduced using biofuels, an increase in the emissions of Nitrogen oxides (NOx) is inevitable. To address this issue, selective catalytic reduction (SCR) using ammonia (NH3) has played a signif...

ead the full text About Share on Abstract In the present study, the dimensions of the cylindrical turbulators have been optimized to achieve the highest thermal performance. A double pipe heat exchanger with cylindrical turbulators placed in the annulus side is modeled and a numerical simulation is carried out for different operating conditions. T...

Carbon capture and storage has been recognized as the most promising method for CO2 control. Among the many sorbents, char derived from pyrolysis and hydrothermal carbonization (HTC) of biomass have demonstrated excellent CO2 adsorption capability. This paper reviews the different parameters to produce a higher yield of biochar and hydrochar sui...

Waste cooking oil (WCO) biodiesel is becoming promising fuel for compression ignition (CI) engines. Due to the poor thermal efficiency, engine modifications and fuel modifications have been adopted over the years to enhance the performance. In the current study, performance from the biodiesel engine at different injection timing has been studied us...

Biodiesel is comprised of 36e75% oleic fatty acid (OA) that has the molecular formula,C18H34O2and is an excellent carrier of hydrogen and oxygen. OA has proven to have a positive effect in curbing NOx from biodiesel combustion. In this work, the effect of varying concentrations of OA in Pongamia ester is studied on a compression ignition engine tha...

Meeting the emission norms specified by governing bodies is one of the major challenges faced by engine manufacturers, especially without sacrificing engine performance and fuel economy. Several methods and techniques are being used globally to reduce engine emissions. Even though emissions can be reduced, doing so usually entails a deterioration i...

Biofuels are one of the most sought-after renewable energy sources to overcome the current energy crisis in the world. Diesel blended with esters derived from oils has shown appreciable results for its use in compression ignition engines. In this work, B20 (20% biodiesel + 80% diesel by volume) fuel blend comprising 80% diesel and 20% biofuel extra...

In the current study, an effort has been made to use biodiesel together with nano sized additives as combustion promoter and as an emission inhibitor. The study investigates the influence of volume concentration of cerium oxide (CeO2) nanoparticles (NPs) on the engine combustion and emission at different load conditions. Engine experiments are con...

Anaerobic digestion is one of the main waste-to-energy technologies in reducing the volume of biodegradable waste into energy-rich biogas. Recent studies have revealed that kitchen wastes as a feedstock possess great potential in energy production and anaerobic digestion proved to be a promising technology among different kitchen waste management t...

Solar minichannel flat plate collector (MFPC) has shown appreciable results in the recent past. Compared to the conventional flat plate collector (CFPC), MFPC is simple in construction and provides better output. However, optimization studies on MFPC have not been well attended. In this paper, a simulation of MFPC is carried out using a novel mathe...

Hydrothermal carbonization (HTC) technique is used to convert lignocellulosic biomass into carbon-rich solid fuel. The product, hydrochar, finds a multitude of applications as a fuel, catalyst, adsorbent, etc. This paper reviews the different feedstock suitable for HTC that are experimentally investigated and classifies them into five categories li...

Anaerobic digestion is a globally used biochemical process to convert the organic matter present in wastes into an energy rich biogas with methane as the major constituent. Implementing additives in the anaerobic digestion process enhances biogas production. Recent studies have revealed that nanoparticles additives influence the anaerobic digestion...

In a double-pipe heat exchanger, heat transfer enhancement can be carried out by active or passive methods. In the present study, heat transfer characteristics are studied by the addition of hemispherical turbulators placed in the annulus region in a double-pipe heat exchanger. The turbulators are placed in the annulus region on the inner pipe sepa...

In the present study, the effect of inserting a twisted tape as a passive device for heat augmentation inside a square tube has been numerically studied under turbulent conditions. A twisted tape with constant pitch has been placed inside a square tube with negligible thickness and numerical simulation was done with Reynolds number (Re) of the fl...

In this study, an attempt has been made to investigate the use of higher blend percentage of biodiesel in diesel engines without affecting much on the performance of engines using fuel additives. Waste cooking oil (WCO) biodiesel B30 blend (WCO 30%+ neat diesel 70%) and B40 (WCO 40%+ neat diesel 70%) are used as the fuel together with diethyl ether...

The present study investigates the effect of nanoparticles on the performance of Paraffin wax in a latent heat thermal storage system. The experiments are conducted using organic compound which is paraffin wax with 0.5, 1 and 1.5% (volume) aluminium oxide (Al2O3) nanoparticles. Thermal storage system is designed and fabricated as per the design dim...

In the present study, an effort has been made to use higher biodiesel blends effectively in compression ignition engine by using low viscosity oxygenated fuel additives. Experimental investigation is carried out to select the best possible additive to the neat biodiesel in order to run the engine using higher blends. It is seen that performance of...

This paper reviews the current copper substituted zeolite catalysts, their operating temperature ranges with NOx reduction efficiencies and their deactivation mechanisms. Different zeolite candidates suitable for NH3-SCR are large and medium pore zeolites like ZSM-5, MOR, FER, BEA and small pore zeolites like SSZ-13 and SAPO-34, both having CHA top...

Introducing passive devices in the form of inserts helps to increase the heat transfer characteristics in a circular pipe. In the present work, the feasibility of using two twisted tapes has been numerically studied under laminar flow conditions. Two twisted tapes with configurations of co‐swirl and counter‐swirl conditions were simulated for Re ra...

In the present study, the effect of a helical coiled tape on the heat transfer characteristics in a tubular heat exchanger has been studied. Numerical analysis is carried out in a tubular heat exchanger with a helical coiled tape insert under laminar flow conditions. The heat transfer characteristics, like Nusselt number (Nu) and friction factor (f...

Vegetable oil based fuels are promising substitutes for diesel fuel for transport and industrial applications. Converting raw vegetable oils into their ethyl or methyl esters has reasonably solved the problems associated with their high viscosities. The purpose of the research is to investigate experimentally the effect of injection pressure on the...

In the present work, the use of cylindrical turbulators in a double pipe heat exchanger has been investigated. Cylindrical fin type of turbulators has been placed circumferentially separated by 90° on the outer side of an inner pipe at a regular pitch. Experimental stud- ies were undertaken for different air flow rates in a turbulent regime whose R...

In the present study, the effects of water emulsion and diethyl ether additive on the combustion performance and emissions of a compression ignition engine using biodiesel blends are investigated on a four stroke, single cylinder diesel engine. The emulsification technique is used to reduce the oxides of nitrogen emission. Biodiesel is produced fro...

Effectively utilizing agro residues, when abundantly available, can help energy conservation efforts and increases farmers’ incomes. The paper highlights the effective utilization of agro and industrial biomass residues in the form of briquettes. The various types of feedstock used and the technologies adopted in the briquetting process are discuss...

Concerns over the depletion of conventional fuels have increased interest in new renewable energy sources like alcohol- and vegetable-based oils. Major drawbacks of using esters of vegetable oils, known as biodiesel, include reduced engine performance and increased emissions of oxides of nitrogen. In the present study, the effects of ethanol on bio...

Biomass is a promising source of energy that can be substituted effectively for fossil fuels in many applications. In a developing country like India, people rely heavily on kerosene as a fuel for cooking and heating. Being derived from fossil fuels, kerosene is a finite resource and its cost is likely to increase in the future. Hence, the partial...

Biodiesel is playing an important role in transport sector as a substitute for petroleum fuels. The present study diagnoses the use of phenolic biofuel blends namely, cardanol at higher fuel injection pressure on the performance and exhaust emissions of a direct injection, 4-stroke, single cylinder compression ignition engine. In this study, biofue...

In the present work, design of experiments has been used to study the effect of thermal parameters on heat transfer enhancement in a double pipe heat exchanger using a passive technique. A twisted tape is considered as the heat augmentation device with tape width, tape pitch and mass flow rate as the input parameters and Nusselt number (Nu) and pre...

In the present scenario increasing prices of crude petroleum products, depletion of oil sources, and increased concern towards environmental pollution have renewed attention in evolving and consuming eco-friendly lubricants derived from substitute sources. A bio-lubricant is renewable in nature, eco-friendly, non-toxic, and free from pollution....

Two-stroke petrol engines find wide applications in the areas like chain saws, weed cutters, and power sprayers because of their compactness and higher power to weight ratio. In the present study, the feasibility of using vegetable-based lubricant instead of ordinary mineral 2 T oil is investigated. M15 (85% petrol + 15% methanol) and E15 (85% petr...

In view of escalating concerns about energy (fuel) supply and environmental degradation, biodiesel is viewed as a potential replacement for petro-diesel, thereby reducing the dependences of many nations on importing crude petroleum. Cashew nut shell liquid (CNSL) is a biofuel that is renewable and biodegradable and has similar properties of petro-d...

In the present study an attempt has been made to optimize the engine operating parameters for the optimum thermal performance of a diesel engine fuelled with blends of honge methyl ester using the Response Surface Methodology (RSM). Design of experiments was used to plan the number of experiments. Engine experiments were carried on a water cooled d...

In the present study investigates the effect of bio-ethanol on the performance and emissions of a biodiesel blend fueled compression ignition engine. The experiments are conducted using pongamia biodiesel blend B20 (20% pongamia biodiesel +80% diesel) with 5, 7.5 and 10% (v/v) of bio-ethanol on a four stroke single cylinder diesel engine. The tests...

Coolants such as water and ethylene glycol have been used traditionally in automotive car radiators. However, due to their low thermal conductivity a class of fluids known as nanofluids is used to enhance heat transfer characteristics. Nanofluids are suspended metallic or nonmetallic oxide nanoparticles in traditional heat transfer fluids that have...

Heat exchangers play an important role in the industries comprising heat transfer applications like power plants, refineries, etc. Enhancing the heat transfer coefficient can be achieved by increasing the area of heat transfer per unit volume. This could be achieved by considering a helically coiled tube as a heat exchanger. The present paper inves...

To use solar energy effectively and as a standalone source, the performance of thermal energy storage device is crucial. The quantity and quality of energy stored using these devices play an important role in the efficient operation of thermal engineering equipment in the area of Heating Ventilation and Air Conditioning (HVAC), Refrigeration and ma...

Concern over unsustainability of petroleum fuels has necessitated the interest in research for alternative fuels. Biodiesel has popped up as promising choice for detailed study as it is renewable and biodegradable with reduced emissions. Since completely miscible with petroleum diesel, various blends of diesel-biodiesel were used along with the add...

The rising consumption and demand for fossil fuels have increased concern over its depletion rate and therefore stimulated the actions necessary to tackle the issue with an efficient and less polluting alternative fuel for diesel. The use of nanoparticles with liquid fuel (either diesel or biodiesel) has shown promising and challenging results. Whe...

This paper reviews the results of various researchers from different countries who prepared biofuels from vegetable oils and animal fats. The performance and emission characteristics can be improved by blending with petrodiesel, changing the fuel injection parameters, adding oxygen-rich fuel additives and employing intake air oxygen enrichment meth...

Combustion stability of a multipoint port fuel injection spark ignition engine working on liquefied petroleum gas (LPG)-gasoline dual fuel mode of operation was analysed. LPG-gasoline ratio was varied from 0 to 100% by controlling the injector signals at wide open throttle condition and 3000 RPM. Increasing LPG ratio will give higher peak pressure...

The 9-Octadecenoic acid (oleic fatty acid) content of vegetable oil seeds can be altered by mutagenesis, thereby increasing its content in the oil, for the purpose of increasing shelf life. In this work, the effect of varying the oleic acid content in ester on the performance and emission of a CI engine was examined. For this purpose, the situation...

The present study investigates the combined effect of oxygen enrichment and exhaust gas recirculation (EGR) on the performance and emission characteristics of a cardanol biofuel blend, namely B20M10 (20% cardanol, 70% diesel and 10% methanol by volume). The tests are conducted on a four-stroke single-cylinder diesel engine at different loading cond...

The present study deals with the performance and emission characteristics of a multi-point fuel injection (MPFI) spark ignition (SI) engine in gasoline–liquefied petroleum gas (LPG) dual fuel mode of operation. The LPG–gasoline ratio varied from 0 to 100% by controlling the injector signals at various speed and load conditions. Experiments show tha...

Presently, energy security and food security are two major problems of developing countries. The use of edible oils as an alternative fuel for internal combustion may lead to a food crisis. The non-edible plant-based alternative fuel not only results in energy security but also helps to keep the environment free from pollution. In this experimental...

The present investigation deals with the combustion, performance, and emission characteristics of cardanol based B20M10 (20% cardanol + 70% diesel + 10% methanol) and B30M10 (30% cardanol + 60% diesel + 10% methanol) biofuel blends. The experiments are conducted on a four-stroke single cylinder diesel engine with 27.5 deg. bTDC standard ignition ti...

In this study, the effect of intake air enrichment on the performance and emission characteristics of a single-cylinder direct-injection diesel engine fueled with non edible oil namely Cardanol—diesel-methanol blend (B20M10) are investigated. With increase of intake air oxygen concentration, CO and HC decreased while brake thermal efficiency and NO...

The use of biodiesel along with other alternative fuel sources is expected to address the twin problems of pollution and energy security. This study investigates the effect of injection pressure (IP) on the performance, combustion, and emission characteristics of a four-stroke single cylinder direct injection diesel engine fuelled with a biofuel, n...

We investigated the effect of intake air enrichment on the performance, combustion, and emission characteristics of a single cylinder direct-injection stationary diesel engine fueled with non- edible alternative fuel, namely, cardanol — diesel — methanol blend (B20M10). The results were compared with baseline diesel operations under standard operat...

The present study investigates the effect of air-side oxygen concentration enrichment on the performance and emission of a single cylinder diesel engine using a bio-fuel blend as fuel. In this study, a natural phenolic compound, namely, cardanol is selected as the bio-fuel, which is obtained from the shell of cashew nut after purification. A blend...

In this study, non edible oil namely Cardanol is directly blended with diesel for use in a single cylinder CI engine. Mthanol is added as an additive to improve the volatility, atomization etc. Experiments are carried out with various blends of cardanol namely B20 and B30 with 10% methanol and results are compared with B20. Results have shown that...