Papers by Gangacharyulu Dasaroju
Materials Today: Proceedings, 2020
The aim of the present study is to perform numerical analysis on the performance of a flat tube w... more The aim of the present study is to perform numerical analysis on the performance of a flat tube with copper oxide nanofluids. The nanofluid was passed through a virtual 3D model of a flat tube. Advantages of using nanofluids instead of pure base fluid were evaluated. The thermophysical properties of the nanofluid were calculated using correlations (function of temperature and volumetric concentration nanoparticles) developed from experimental work. It was observed that the heat transfer performance of a flat tube increased with increase in particle concentration, temperature and Reynolds number. The pressure drop across flat tube increased with increasing volumetric concentration of nanoparticle and Reynolds number.
Vacuum, 2019
Formation, stability and comparison of water/oil emulsion using gum arabic and guar gum and effec... more Formation, stability and comparison of water/oil emulsion using gum arabic and guar gum and effect of aging of polymers on drag reduction percentage in water/oil flow
Nanofluids open new window for energy efficient thermal equipment that brings more facilities, op... more Nanofluids open new window for energy efficient thermal equipment that brings more facilities, options, opportunities and better performance in the area of heat transfer. There are large varieties of available nanofluids that are being used in various Plate heat exchangers. In recent years due to increased alternates of nanofluid, a challenge or complexity is being faced to select of best nanofluid for a particular heat exchanger in a particular application. The paper attempts to address some of the issues faced during evaluation and application of nanofluids for heat exchangers. The method proposes an attribute based specification, evaluation, comparison and ranking scheme for in depth understanding by decision makers. The multiple attribute decision making process reduce a number of pertinent attributes into a single numerical index to take some of these decisions. The problem of different units, magnitudes and applications is also addressed in the method. The sensitivity analysis...
Abstract-Suspended nanoparticles in conventional fluids, called nanofluids, have been the subject... more Abstract-Suspended nanoparticles in conventional fluids, called nanofluids, have been the subject of intensive study worldwide since pioneering researchers recently discovered the anomalous thermal behaviour of these fluids. The enhanced thermal conductivity of these fluids with small-particle concentration was surprising and could not be explained by existing theories. Micrometer-sized particle-fluid suspensions exhibit no such dramatic enhancement. This difference has led to studies of other modes of heat transfer and efforts to develop a comprehensive theory. Here, various aspects of nanofluids including synthesis, experimental and theoretical studies on the effective thermal conductivity, convective heat transfer, and applications are reviewed.
A steady amelioration in technology has raised research work for developing nanofluids as coolant... more A steady amelioration in technology has raised research work for developing nanofluids as coolants in comparison to the conventionally used coolants. This article reflects upon a review of the thermo-physical properties of nanofluids and how various factors affect those properties. Addition of surfactants, operating temperature, duration of sonication, concentration of nanoparticles and various other factors contribute towards changing the properties such as thermal conductivity and viscosity of nanofluids. Thus, a wholesome analysis of properties is essential for the future course of research and developmental work. The purpose of this review article is to highlight the content of articles published in this direction and guide a course for future developments.
ABSTARCT: Automotive Industry, globally, as well in India, is one of the key sectors of the econo... more ABSTARCT: Automotive Industry, globally, as well in India, is one of the key sectors of the economy. With the rapid and exponential growth of industrial production in India, the issue of disposal of automobiles at the end of useful life is becoming increasingly important. After a product's life cycle has ended, there are number of recovery options available such as reusing the parts, remanufacturing, and material recycling. A simple look at the processing of the end-of-life vehicles data reveals the fact that as compared to developed countries like US, the methodological advancements in India are fraction of their technology. Technological procedures that comprise of the standardized methodology for the processing of end-of-life vehicles have not attracted much attention and not much work has been done in this area. Thus, the prime concern of this research is to identify the benefits and limitations of the optimal processing methods for these vehicles that can no longer be run o...
Proceedings of the 20th International Conference on Fluidized Bed Combustion, 2009
Rice is Cultivated in all the main regions of world. The worldwide annual rice production could b... more Rice is Cultivated in all the main regions of world. The worldwide annual rice production could be 666million tons (www. monstersandcritics. com, 2008) for year 2008. The annual production of rice husk is 133.2 million tons considering rice husk being 20% of total paddy production. The average annual energy potential is 1.998* 10 12 MJ of rice husk considering 15MJ/kg of rice husk. India has vast resource of rice husk; a renewable source of fuel, which if used effectively would reduce the rate of depletion of fossil energy ...
The aim of this paper is to present the descriptive and empirical results of the survey responses... more The aim of this paper is to present the descriptive and empirical results of the survey responses regarding the gear oil drainage from end-of-life vehicle (ELV). The study evaluates the various drainage procedures and its effects on drainage time, amount of gear oil drained out and the cars processed daily. The survey results suggest that there are differences in manual, semi-automatic and fully-automatic methods for the input factors considered and also vary across countries. Further benefits of implementing semi-automatic or full-automatic method preserves the eco-system, improves the safety of workers and effectiveness of the drainage procedure. The statistical results have proved to be reliable and effective for practical applications, and the analysis would be considered for the improvement in the design of existing practices.
Applied Thermal Engineering, 1999
Performance evaluation of a radiator mounted on a turbo-charged diesel engine has been made with ... more Performance evaluation of a radiator mounted on a turbo-charged diesel engine has been made with and without fouling factor. Heat transfer estimation indicates that the radiator is over designed. The characteristics of the radiator have been analyzed for dierent tube rows with varying air mass velocities to enable the design engineer to select the size depending upon the requirement and application. The study also examines the eect of dierent materials of construction of ®ns and tubes. It has been observed that the copper ®ns with copper, brass and carbon steel tubes oer the same heat transfer and pressure drop characteristics. However, the designer must look into the mechanical properties of these materials as they suit the requirements.
ASME/JSME 2007 Thermal Engineering Heat Transfer Summer Conference, Volume 1, 2007
With the incremental heat dissipation requirements of the CPU and intricate electronic circuits r... more With the incremental heat dissipation requirements of the CPU and intricate electronic circuits requiring flexible piping for the extraction of large amount of heat, a loop heat pipe [LHP] is studied and empirically designed. An experimental study of a LHP has been conducted under the natural convection conditions taking into consideration the variable heat inputs and the quantities of working fluid. The LHP made of copper tubing with horizontal evaporator having a brass mesh wick have been studied and presented for various heat inputs 25 W, 50 W, 75 W, 100 W, 125 W and 150 W. The heat was transferred to the evaporator by constructing a parallel flow heat exchanger. The study was conducted at a vertical orientation using distilled water as the working fluid. Exhaustive attempt has been done in analyzing the effect of various quantities of working fluid (120 gm, 125 gm, 130 gm, 135 gm and 140 gm) on heat transfer parameters. The results includes an achievement of an averaged value of...
International Journal of Renewable Energy Technology, 2011
Rice is cultivated in all the main regions of world. The worldwide annual rice production is 666 ... more Rice is cultivated in all the main regions of world. The worldwide annual rice production is 666 million tons for the year 2008. The combustion and gasification of rice husk/rice straw in fluidised bed reactors seems to be an attractive possibility of future for power generation, the solution of waste disposal problems and the reduction of greenhouse gases. In this paper, overview of fluidised bed reactors based on rice husk/rice straw and some data collected/measured from rice husk-rice straw power plant is presented. Combustion ...
Vikas Kumar 1* , D. Gangacharyulu 2* , Parlapalli MS Rao 3 and RS Barve 4 ... 1 Centre for Develo... more Vikas Kumar 1* , D. Gangacharyulu 2* , Parlapalli MS Rao 3 and RS Barve 4 ... 1 Centre for Development of Advanced Computing, Pune University Campus, Pune, India 2 Thapar Institute of Engineering & Technology, Patiala, India 3 Nanyang Technological University, ...
Abstract—Heat pipe is characterised as superconductor of heat because of its excellent heat remov... more Abstract—Heat pipe is characterised as superconductor of heat because of its excellent heat removal ability. The operation of several engineering system results in generation of heat. This may cause several overheating problems and lead to failure of the systems. To overcome this problem and to achieve desired rate of heat dissipation, there is need to study the performance of heat pipe with annular fins under free convection at different inclinations. This study demonstrates the effect of different mass flow rate of hot fluid into evaporator section on the condenser side heat transfer coefficient with annular fins under natural convection at different inclinations. In this study annular fins are used for the experimental work having dimensions of length of fin, thickness of fin and spacing of fin as 10 mm, 1 mm and 6 mm, respectively. The main aim of present study is to discover at what inclination angles the maximum heat transfer coefficient shall be achieved. The heat transfer co...
International Journal of Renewable Energy Technology, 2011
The combustion of rice husk in fluidised bed combustors seems to be an attractive possibility for... more The combustion of rice husk in fluidised bed combustors seems to be an attractive possibility for power generation in the future, keeping in view the waste disposal problems and the reduction of greenhouse gases. In commercial installations, the occurrence of agglomeration is still one of the main reasons for unscheduled outrages. In this paper, a review of agglomeration mechanism and its prevention has been made by considering the case study of a 3.5 MW rice husk-based power plant situated at Nahar Spinning Mills Ltd.( ...
International Journal of Energy for a Clean Environment
Heat Transfer Engineering
The present investigation reports a theoretical and experimental study of a wire screen heat pipe... more The present investigation reports a theoretical and experimental study of a wire screen heat pipe, the evaporator section of which is subjected to forced convective heating and the condenser section to natural convective cooling in air. The theoretical study deals with the development of an analytical model based on thermal resistance network approach. The model computes thermal resistances at the external surface of the evaporator and condenser as well as inside the heat pipe. A test rig has been developed to evaluate the thermal performance of the heat pipe. The effects of operating parameters (i.e., tilt angle of the heat pipe and heating fluid inlet temperature at the evaporator) have been experimentally studied. Experimental results have been used to compare the analytical model. The heat transfer coefficients predicted by the model at the external surface of the evaporator and condenser are reasonably in agreement with experimental results.
Energy Conversion and Management, Nov 30, 2008
In this paper an experience, environmental assessment, a model for exit gas composition, agglomer... more In this paper an experience, environmental assessment, a model for exit gas composition, agglomeration problem and a model for solid population balance of 10MW power plant at Jalkheri, Distt. Fatehgarh Sahib, Punjab, India based on rice husk has been discussed. Three phase multistage mathematical model for exit gas composition of rice husk in fluidized bed has been derived. The model is based on three-phase theory of fluidization and material balance for shrinking rice husk particles and it is similar to model developed by ...
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Papers by Gangacharyulu Dasaroju