bluuebunny/crossref_metadata_2025_split huggingface dataset:
Development and numerical assessment of a regulation strategy for Sliding Rotary Vane Expander based on revolution speed variation
Authors: Fatigati F , Bartolomeo M Di , Battista D Di , Cipollone R 
Published: May 2021

Abstract
Sliding Rotary Vane Expanders (SVRE) are widely used in ORC-based power units for waste heat recovery in internal combustion engine (ICE) thanks to the capability to handle off-design conditions and their lower speed. In particular, SVRE revolution speed is usually varied together with the pump one to regulate the recovery unit. Nevertheless, this parameter affects SVRE performance and such effects should be taken into account. Thus, in order to reach this goal, in this paper a control strategy based on revolution speed variation was developed for SVRE. Its suitability and effects on expander performance were analyzed through a SVRE model developed in GT-Suite™ environment. The model was experimentally validated thanks to an extensive experimental campaign carried out on a 1.5 kW SVRE installed on an ORC-based power unit fed by the exhaust gases of a 3 liters supercharged Diesel engine. The results confirm the regulation strategy effectiveness as the maximum deviation between the intake-end pressure (object of regulation) and the set-point is 4% of its value for a wide range of operating conditions. Moreover, the numerical results show that the increase of revolution speed until a certain value leads to the expander global efficiency increase and mechanical power too.
Influence of engine torque fluctuations on performance characteristics of pumps mounted on vehicles
Authors: Kawahara Takuma , Takamiya Hideaki , Motono Hitoshi , Hotta Yasuhiro , Miyagawa Kazuyoshi 
Published: May 2021

Abstract
A fire pump mounted on the fire engine is driven by a car engine. The engine has plurality of combustion chambers and converts the reciprocating motion of the pistons into rotational motion while shifting the combustion timing of each combustion chambers. When the force generated by the combustion is converted into torque, periodic torque fluctuation is generated. Torque fluctuation finally generates the rotation fluctuation. We analyzed pump performance by the rotation with the sinusoidal fluctuation for the impeller. From the viewpoint of torque and total head, each variable fluctuated in the same phase, but it was confirmed that there was a difference in fluctuation range. With engine rotation fluctuation given to the pump, we verify the pressure characteristics and efficiency on the outlet side change by CFD. In this paper, therefore, we report the results of CFD on pump output characteristics when periodic rotational fluctuations occur due to unsteady torque characteristics of the engine.
Effect of suction pipeline resistance on cavitation surge in a turbopump with inducer
Authors: Tanaka Y , Kitabata T , Nasu K , Watanabe S , Ohashi S , Sakata A 
Published: May 2021

Abstract
Cavitation surge is one of the vital flow instabilities in turbopumps, which should be avoided in actual operation. According to the past stability analyses, it is shown that the suction pipeline resistance has a suppression effect of cavitation surge. In the present study, we experimentally examined this effect by changing the suction pipeline resistance through the opening of butterfly valve installed upstream of inlet pipe. As a result, it was found that the onset range of cavitation surge could be significantly narrowed by the large suction pipeline resistance, which agreed with the above finding by the theoretical analyses.
A comparative study on accurate prediction of cavitation characteristics for head drop in a mixed-flow pump with steady- and unsteady-state analysis
Authors: Kim Yong-In , Kim Sung , Yang Hyeon-Mo , Lee Kyoung-Yong , Lee Yong-Kab , Choi Young-Seok 
Published: May 2021

Abstract
The cavitation characteristics for the head drop in a mixed-flow pump were investigated with the steady- and unsteady-state analysis. Two mixed-flow pump models exhibiting a different incidence angle were analyzed under the cavitation condition. The model with a larger incidence angle obtains relatively poor suction performance. Moreover, the steady-and unsteady-state analysis indicate different head level under the cavitation condition. The results of the unsteady-state analysis are more accurate to the experimental results. The head of a fully convergent steady-state analysis is not even distributed in the head fluctuation range of the unsteady-state analysis. However, the head drop due to the decrease of inlet pressure has almost the same distribution and gradient. In addition, the amount and shape of the bubbles were presented with the time variation, which were also compared with the averaged result of steady-state analysis. The bubbles show a larger oscillation in the model which has a larger incidence angle. The oscillation of the bubbles is related to the magnitude of the head fluctuation.
Feasibility study for the application of a neural network for operating condition detection of a centrifugal pump
Authors: Feng Jun , Böhle Martin 
Published: May 2021

Abstract
Artificial intelligence (AI) technology is successfully used in many fields. Originally, AI was developed for image and voice recognition and has been spread out on other fields like detecting deceases, behaviour, traffic movement etc. AI is also applied in fluidmachinery, for example in order to detect defaults in pumps, fans, compressors and turbines.
This work verifies the feasibility for the application of a neuronal network (NN) for operation point detection of an impeller pump by vibration signals. Once the NN is trained with the vibration signal, it can recognize the operating point by the vibration signal of the impeller pump.
In order to test whether the neural network method is feasible, a pump loop system was built up, which contains a radial centrifugal pump with a replaceable impeller. The vibration signal of the impeller pump is taken for different operating points and used for training a NN. In the first step a simple self-programmed NN in C++ is applied in order to find out a convenient NN-topology for operating point detection. The congruence rate of this simple NN method already reaches about 90%. The research results in this paper show that an operating point can be detected by the application of a simple NN. It is carried out how large the influence of the topology of a NN is in regard to the congruence rate (CR). By further application of AI like convolutional layers, batch normalization etc. a better CR seems to be very likely. From this point of view this contribution reports about a starting point of operating point detection of impeller pumps by the application of a NN.
Development of A High-Load Capacity Test Rig to Evaluate the Static Performance of Process Fluid-Lubricated Thrust Bearings
Authors: Bian Zheng , McClean Sean , Delgado Adolfo , Patil Abhay 
Published: May 2021

Abstract
Electrical submersible pumps (ESPs) are artificial lift devices widely used in the oil and gas industry to increase production. For unconventional wells, which includes subsea applications, installation cost is an order of magnitude higher than the cost of the typical ESP, thus pump reliability is paramount. Contamination of the thrust bearing lubricant oil by process fluid due to seal failures is one of the leading causes of thrust bearing failure. While improving seal reliability can prevent thrust bearing failures, an alternative approach is to develop process-fluid lubricated thrust bearings. This research aims to characterize and study the performance of thrust bearings operating with process fluid lubrication. A component level-level test rig for testing the performance of thrust bearings in any mixture of water, sand, and air is designed, built, and commissioned. Initial tests of the PEEK and Tungsten Carbide (WC) bearings include a load capacity test to determine the hydrodynamic limit of the bearing, a hydrodynamic test to corroborate test rig stability, and a wear test to determine if the bearings can operate feasibly past hydrodynamic limits in a mixed lubrication regime. Initial results show that lubrication starvation can occur in an unpressurized chamber for low viscosity fluids that are not supplied directly to the bearing. Furthermore, the film thickness, temperature rise in the pads, and load capacity all are lower for water lubricated bearings when compared to oil lubricated bearings. Results suggest that liner material affects wear rate but not load capacity; however, operating even the WC bearings past hydrodynamic limits causes substantial wear and is not recommended as an operating mode. Polycrystalline Diamond (PCD) coated mixed lubrication bearings were also tested. These bearings, although requiring higher drive torque, sustained higher loads than the tilting pad bearings without significant wear
Development of High Specific Load Direct Lubricated Two Pads Journal Bearing
Authors: Yamawaki T , Yoshimine C , Nakano T , Waki Y , Sumi Y 
Published: May 2021

Abstract
MHPS and MHI suggest HP/IP/LP separate casing and one bearing/rotor (one bearing between two casings) type steam turbine. To design this type of shaft arrangement, journal bearing that supports high specific load with superior oil film static and dynamic characteristics is demanded. In this paper, it is shown that 610 mm diameter direct lubricated two pads bearing which can operate at high specific load has been developed. Also, it is confirmed that its good bearing characteristics in full scale test.
Development of turbocharger engine system using 3D and 1D simulation to achieve 50% brake thermal efficiency
Authors: Nakamura Yohei , Miyagawa Kazuyoshi , Moriyoshi Yasuo , Kuboyama Tatsuya 
Published: May 2021

Abstract
In recent years, automobile exhaust gas regulations have become stricter due to environmental problems such as global warming. A project by the Cabinet Office called the Strategic Innovation Promotion Program (SIP) began in 2014. SIP has 11 themes in total. One of them, innovative combustion technology, aimed to improve the thermal efficiency of automobiles from the existing 40% to 50%. To improve the thermal efficiency of the automobile, it was essential to improve the efficiency of the turbocharger. In this study, we developed a turbocharger for gasoline and diesel engines. First, to confirm the efficiency of the conventional turbocharger, experiments and CFD analysis of a commercial turbocharger were performed. ANSYS-CFX was used as a numerical code. To confirm the accuracy of the CFD, the CFD results were compared with the experimental results, and it had good agreement with the experimental results. From the analysis results, the loss region of the conventional turbocharger was clarified. The designed turbocharger compressor was tested as a prototype compressor. The results of the compressor had good agreement with CFD results, so it was confirmed that the accuracy of CFD and design method was valid. Finally, A one-dimensional simulation using GT-Power which is a system analysis software for automobiles was performed to evaluate the developed turbocharger on the engine. In the fifth year of the project, the target efficiency of 50% was achieved.
Bio Remediation of Petroleum Contaminated Landfill Dump Sites
Authors: Maruthi Venkatesh K , Anusha G , Arumairaj P D 
Published: May 2021

Abstract
Bioremediation is the process using living organisms to clean up contaminated soil. The main advantage of bio remediation is that it allows soil to be treated without being excavated or transported. The rate at which microorganism degrade contaminants is influenced by specific contaminants and their concentration, oxygen supply, moisture, temperature, pH value, nutrients supply and bio augmentation. Treatability studies are conducted to determine the effectiveness of treatment process performance. In this project work, the work is carried out in three phases. In the first phase, the landfill sites in and around Chennai are visited to collect samples. The site characterization and soil analysis are done for five landfill sites. In the second phase, the soil samples collected are subjected to nutrient bio remediation. The effect of pH, temperature and biomass concentration is studied over a period of 30 days. The optimum condition for a good remediation of contaminated soil is achieved.
Assessing the Demand of Road Infrastructure Adjacent to Terminal Stations
Authors: Logeswaran S , Saravana Kumar P , Kavitha R , Rajkumar K , Manikandan P , Karthikeyan S 
Published: May 2021

Abstract
The aim of the research work is to find out factors affecting the road improvements for the roads adjacent to the bus terminus. Transport is the basic utility which serves for the people in the aspects of daily demand. The traffic existing around the core area of the city is usually high when compared with roads connecting city with highways. Bus transportation is the basic need for public transportation of a city. The demand of bus transportation increases day by day due to more usage of peoples migrates from various locations to the city area. The infrastructure development in bus terminus is still a big question mark whether the terminus improvement exists as per the increase in traffic capacity or not. The reason behind the analysis is that the improper arrangement of existing road furniture’s without any possibility for future expansion as per increase in demand. The solution for the traffic problem occurs around the bus terminuses was identified and the standards for the terminal elements were made. This helps the pedestrians and vehicles to make a smooth flow of traffic around the terminal area.
Experimental Investigation of Organic Waste Ash in Concrete
Authors: Rajeshkumar V , Elango K S , Vivek D , Anandaraj S , Vinodhini C , Kamalakannan P 
Published: May 2021

Abstract
Organic waste is one of the major wastes producing substances in the world. Recycling is done on plastics and other materials due to its high cost. The major constituents of concrete are cement and posses’ certain properties that cannot be replaced by any material. Usage of cement leads to environmental pollution, greenhouse effect. Replacement of cement with organic waste will reduce the cost, time and also reduces pollution. This paper focuses on replacement of cement partially with organic waste ash in 5%, 10% and 15% by weight on mechanical properties of concrete. The XRF test is used and the result shows organic waste ash is not a pozzolanic substance. The optimum performance is obtained at 5% replacement of cement by weight.
Microbial Composting
Authors: Anusha G , Maruthi Venkatesh K , Aravind M , Ramakrishnan S 
Published: May 2021

Abstract
Human population generates enormous amount of solid and liquid waste directly and produces industrial effluent indirectly. Due to usage of synthetic fertilizers and pesticides in the agriculture fields, man inflicts deep wounds on environment. Pollution is defined as undesirable changes occur in water, land and air. Waste generation has been observed to increase annually in proportion to the rise in population and urbanization. As more land is needed for the ultimate disposal of these solid wastes, issues related to disposal have become highly challenging.
Reuse of improved recycled concrete aggregates (RCA) for sustainable and environmental-friendly construction materials
Authors: Alyaseen Ahmad , Shah Siddharth , Solanki Ravindra , Daxini Bhavik , Alwani Yogesh K. , Alahmad Hussain 
Published: May 2021

Abstract
Recycled aggregates have an essential role in constructing construction activities today to save natural aggregates because of industrial development. The research aims to assess the suitability of recycled aggregates for the construction of new roads, which will help achieve road construction efficiency and help prevent environmental deterioration in the extraction and reducing pollution. In contrast with natural aggregates, recycled aggregates are of lower quality, mainly due to the cement mortar’s brittle nature attached to them. The point of the study is to increase the performance of RCAs in an environmentally friendly managing RCAs. In this process, RCAs are first soaked in acetic acid solution, in which acetic acid reacts with cement attached to the surface of the RCA. This reaction weakens the attached mortar and allows separating from the RCAs by using mechanical friction later. Treated RCAs have lower water absorption and more insufficient cement mortar adhesion. These RCAs used as aggregates in new the concrete increased the compressive strength, the tensile strength, and the concrete’s flexural strength by 26%, 11%, and 26% at 28 days, respectively. It is clean, safe, efficient, and a new method to be applied, so no harmful products are used, and no dangerous substances are incorporated into the RCAs that are being treated. The waste treatment solution was used as a supplementary admixture construction, increasing the concrete’s strength, and decreasing its environmental effects.
Contaminated water treatment with Activated charcoal build from cocoa pod husk
Authors: Sadheesh S , Shankar R , Santhosh Kumar S , Guru Prasath B 
Published: May 2021

Abstract
In this world, effluents released from the refinery affect the environment at major as different studies says that the natural agents have high capacity to absorb bivalent metal ions. Cocoa pod husk is widely produced in south India in minimum cost. During this study, the metal such as lead and copper was investigated. The cocoa pod husk is carbonized at five hundred degree Celsius and saturated with one molar hydrochloric acid at seven hundred degree Celsius in muffle furnace for two hours (atomic number-6). The final product is allowed to test by adsorbing the metals such as lead and copper to make different pH, dosage and contact time. The capacity to adsorb and metal removal percentage were documented when the contact time reaching two hours. The efficiency of the adsorbent to remove the heavy metal lead and copper was 78 % and 97% respectively.
Type Radiation Resisting High Density Concrete - A General Review
Authors: Thavasvi Arunachalam R , Vairava RM , Maruthachalam D 
Published: May 2021

Abstract
Exposure to very high levels of radiation, can cause acute health effects such as skin burns and acute radiation syndrome (“radiation sickness”). It can also result in long-term health effects such as cancer and cardiovascular disease. The Intensity of the radiation which a body receives is inversely proportional to the Thickness or density of the shielding material. Concrete is already an effective Shielding material but if its density is increased, it can be even more effective. Thus, producing high density concrete provides good resistant towards radiation. High density concrete is widely used in nuclear Powerplants and reactors to provide shielding against harmful radiations Emitting from the process of nuclear fission. It can be widely used in hospitals Where radioactive materials are used for medicinal purposes such as radiation Therapy, x ray imaging etc.
MHD Darcy-Forchheimer hybrid nanofluid flow past a nonlinear stretching surface: Numerical study
Authors: Sulochana C , Prasanna Kumar T , Uma M.S , Thulasi L 
Published: May 2021

Abstract
Numerical simulation of hybrid nanoliquid over a power law velocity stretching sheet with darcy forchhimer model is presented in this article. Similarity variable approach is applied to convert governing partial differential equations into ordinary differential equation then solved by shooting method. Impact of distinct flow parameters on momentum, energy and concentration profile is shown in graphs and heat transfer rate for two different hybrid nanofluid models(Ag Fe3O4/H2O and Ag MOS2/H2O) computed tabulated. Heat transfer rate is more in silver-iron oxide combination as compared to silver-molybdenum disulfide.
Adsorption of the Toxin Pesticide (Thiophanate - Methyl) from its Aqueous solution on the Surface of Activated Olive Seed
Authors: Hussein Zainab A , Abdulbari  , Mahood M , Alazzawi Rajwan A 
Published: May 2021

AbstractThe activated charcoal of olive seeds were used in this study to adsorb the toxin pesticide (Thiophanate-Methyl) from its aqueous solutions. The effect of the parameters such as initial concentration, contact time and temperature have been investigated. A thermodynamic analysis shows that the Thiophanate-Methyl removal by the olive seed’s activated charcoal was an exothermic and spontaneous process. The Langmuir and Freundlich models describe the adsorption isotherms, especially Langmuir model according to correlation coefficients. The results show that removing Thiophanate-Methyl by activated charcoal of olive seed from aqueous solution was very effective and has great potential applications in environmental protection.
Effect of Magnesium Oxide and Zinc Oxide Nanoparticles on Triiodothyronine Hormone
Authors: Salman Taghried A. , Ibrahim Tahseen Ali , Al-Rudha Abbas Salma Abd 
Published: May 2021

Abstract
The nanoparticles of magnesium oxide and zinc oxide are diagnosed through several techniques, including the Atomic Force Microscope (AFM) and (XRD). Analyzing the structure of studied nano materials are useful to investigate their medical applications by applying them to the triiodothyronine hormone in the serum. The concentration effect of zinc and magnesium oxides nanoparticles on triiodothyronine hormone were investigated. Results obtained revealed that zinc oxide nanoparticles gave an inhibitory effect. The highest inhibition to triiodothyronine hormone in the serum was achieved when the ZnONPs concentration is 200 ppm. On the other hand, magnesium oxide nanoparticles have no inhibitory effect on hormone action.
Electrical Discharge Machining of Super Alloys: A Review
Authors: Kumar R , Chauhan S S , Yadav D , Namdev S 
Published: May 2021

Abstract
In the current scenario, manufacturing industries faces difficulties during machining of engineering materials-metal based, having higher mechanical properties viz. higher strength, toughness and hardness through conventional machining methods. These problems include rapid tool wear, poor surface quality of work piece material and lower stock removal rate. EDM is a single prominent what more lucrative unconventional machining procedure is, finding its prevalent functions in motorized and aerospace industries for machining of harder materials that is super alloys. Super alloys are the heat-resistant category of metals maintaining their elevated potency at superior temperature. The present paper focuses on the past work done by the researchers on machining of super alloys viz. titanium, nickel and cobalt using EDM and Wire EDM process.
Analyzing the parking demand characteristics in cultural activity-oriented city
Authors: Vaishnavi Devi S , Abdul Wahab H , Gowtham S , Guru Gowtham G K 
Published: May 2021

Abstract
Transportation sector is a backbone for the economic development of any country. The urbanization rapidly increasing and it’s a challenge for the city planners to look into. The United Nations has projected that 67% of the global population lives in urban areas by 2050 compared to 50% in 2010 and a mere 10%-15% in the early 19th century. The factors for urban growth are the migration of the people from the rural areas to urban areas in search of jobs in industries, tourism, services, physical infrastructure facilities etc. Explosive urban growth leads to haphazard expansion of the city. The volume of motorized traffic is increasing in India which is expected to cross 130,000 billion passenger km and has potential in creating energy demand and carbon emissions from transport sector by 2050. The deceleration and acceleration of vehicle in the central business district causes emission and discomfort to the commuters. The width of the road is being occupied by the off-street parking of vehicle results in deceleration and acceleration of vehicle by the commuters which causes more congestion and delay along with emission in the temple city. Our study is to analyze the pattern of demand that arises in traffic dense area of Madurai to park the vehicles without causing any hindrance to the commuters travel in the road.