Papers by D. Yogi Y Goswami
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Abstract : A computer program was developed for predicting the convective and radiative heat tran... more Abstract : A computer program was developed for predicting the convective and radiative heat transfer to the surface of a flat with hypersonic boundary layer flow and with injection of absorbing, emitting and scattering particles due to ablation. The program was used to study the heat transfer rate as a function of wall and freestream temperatures and Mach number of the flow. The results were also obtained to study the effect of injection of absorbing and scattering particles in the boundary layer on the heat flux as a function of wall and free-stream temperatures, Mach numbers and particle radiative properties. It is seen that, if there is a strong external incident radiation, the injection of scattering particles reduces the radiative flux by as much as 75% depending on the scattering coefficient of the particles and the particle density in the flow. A review of the published literature shows that the data of the radiative properties of particles is lacking. Also the data of the radiative properties of modern composite materials surfaces is not available. Keywords: Radiative; Convective; Heat transfer; Absorption; Scattering; Hypersonic flow; Ablation; Radiative properties.
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International Journal of Nanomedicine, 2010
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Mechanical Engineering, 1996
This article describes how solar photocatalytic technology can be an effective method of breaking... more This article describes how solar photocatalytic technology can be an effective method of breaking up toxic chemicals and disinfecting both water and air. The use of solar energy for the production of food, fiber, and heat has been known to mankind for a long time. Research over the last five decades has also made it possible to produce mechanical and electrical power with solar energy. And although the potential of solar radiation for disinfection and environmental mitigation has been known for years, only recently has this technology been scientifically recognized and researched. For anyone who has observed colors fading over long exposure to sunlight, certain materials deteriorating in the sunlight, or skin getting sunburned, it is not hard to imagine sunlight causing reactions that could be used beneficially to break up toxic chemicals. Older civilizations considered it essential that human dwellings be designed to allow sunshine in. This may have been for disinfection or to keep...
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The University's existing Home Management House was retrofitted for demonstration of solar he... more The University's existing Home Management House was retrofitted for demonstration of solar heating and some other energy conservation ideas. The retrofitting included the following: active solar water heating system; attached solar greenhouse for passive space heating; in-line demand water heater; insulation of walls, floor, and attic; installation of storm windows; and covering of fireplace opening and installation of a wood stove. The solar collectors use extruded absorber material from which collectors may be fabricated by do-it-yourselfers. (MHR)
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Applied Energy, 2019
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Energy Procedia, 2017
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Mechanical Engineers' Handbook, 2015
Hydrogen is a good alternative to fossil fuels for the production, distribution, and storage of e... more Hydrogen is a good alternative to fossil fuels for the production, distribution, and storage of energy. Steam reforming of natural gas, or steam methane reformation (SMR), is one of the most developed and commercially used technologies for hydrogen production. Partial oxidation (POX) refers to the conversion of heavy hydrocarbon feedstocks into a mixture of H2, CO, and CO2 using superheated steam and oxygen. In the thermal path hydrogen can be produced in two ways: direct gasification and pyrolysis to produce liquid bio-oil, followed by steam reforming. Fossil fuels, electricity, biomass, and sunlight are four potential resources to use in H2 production. Photochemical and photoelectrochemical systems are currently at a very early stage of development. Hydrogen storage is essential, especially for the on-board vehicular applications that lead to a hydrogen-based economy. This chapter presents various hydrogen storage methods with respect to their physical and chemical phenomena. Keywords: biomass; hydrogen energy; hydrogen storage methods; partial oxidation (POX); steam methane reformation (SMR)
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Reference Module in Earth Systems and Environmental Sciences, 2015
Extracting fresh water from seawater or brackish water requires a great deal of energy, both ther... more Extracting fresh water from seawater or brackish water requires a great deal of energy, both thermal and mechanical. Renewable energy driven processes are becoming more viable despite their expensive infrastructure because they employ free natural energy sources and release no harmful effluents to the environment. Solar radiation is usually chosen over other renewable energy sources in distillation systems because its heat can be directly applied to drive such systems without the adverse energy conversion losses.
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Intersociety Energy Conversion Engineering Conference, 1994
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Volume 12: Micro and Nano Systems, Parts A and B, 2009
ABSTRACT Nanoparticles of Zinc Ferrite (ZnFe2 O4 ) prepared by both wet- and dry- high-energy bal... more ABSTRACT Nanoparticles of Zinc Ferrite (ZnFe2 O4 ) prepared by both wet- and dry- high-energy ball milling (HEBM), have been investigated by X-ray diffraction (XRD), scanning electron microscopy (SEM), high resolution transmission electron microscopy (HRTEM), atomic force microscopy (AFM), surface area and pore size distribution (BET) and wavelength-dependent diffuse reflectance and scattering turned into absorption coefficient estimation using the Kubelka-Munk theory. It was found that after 72 hours of HEBM, the particle size was decreased from 220 nm for the initial material to 16.5 nm and 9.4 nm for the wet- and dry-milled samples, respectively. The optical absorption analysis revealed that the energy gap is increased (blue shift) by 0.45 eV for wet-milled and decreased (“anomalous” red shift) by 0.15 eV for dry-milled samples of ZnFe2 O4 as the particle size decreased.
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Advanced Energy Systems, 2005
A novel biomass hydrogen production technique by integrating gasification and absorption reaction... more A novel biomass hydrogen production technique by integrating gasification and absorption reactions has been suggested. The method involves gasification of biomass in presence of a CO2 sorbent. Ethanol was used as the model biomass compound and CaO was the representative sorbent. Equilibrium modeling was used to determine the product gas composition and hydrogen yield. The analysis was done using ASPEN PLUS software (version 12.1) and Gibbs energy minimization approach was followed. The effects of temperature, pressure, steam/ethanol ratio and CaO/ethanol ratio on product yield were investigated. Three case studies were conducted to understand the effect of sorbent addition on hydrogen yield. Finally a simple energy analysis was carried out to determine the energy consumption and efficiency of sorbent enhanced ethanol gasification.
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Journal of Thermophysics and Heat Transfer, 1996
ABSTRACT
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Journal of Solar Energy Engineering, 1997
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This conference provides a forum to present and discuss the engineering aspects of energy convers... more This conference provides a forum to present and discuss the engineering aspects of energy conversion, advanced and unconventional energy systems and devices, energy conversion and utilization, environmental issues and policy implications on research, development, and implementation of technologies. The solution for a sustainable future will lie in a mix of all of the available energy resources (renewable and non-renewable) and diverse energy conversion technologies that will maintain quality of life in a sustainable manner. The 129 papers in Volume 1 deal with aerospace power and are divided into the following topical sections: Aircraft power; Aerospace power systems; Batteries for aerospace power; Computer simulation; Power electronics; Power management; Space solar power; Space power systems; Space energy statics/dynamics; Space power--requirements and issues; Space Station power; Terrestrial applications of space power; Thermal management; Wireless transmission; Space nuclear pow...
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ASME 2017 11th International Conference on Energy Sustainability, 2017
This paper presents the organic Rankine cycle performance comparison of several working fluids wi... more This paper presents the organic Rankine cycle performance comparison of several working fluids with low global warming potential and low ozone depletion potential at several heat source temperatures. At an evaporating temperature of 80°C, maximum first law efficiency of 5.8% was achieved with ammonia, while at 145°C and 180°C, diethyl ether provides the maximum cycle efficiencies of 11.4% and 13% respectively. For the best operating conditions of the ORC model, a suitable two-stage scroll geometry was modeled and its performance was evaluated. Stage I and stage II scroll geometries with volume ratios of 5.3 each were modeled for the supply conditions of 180°C and 2.6 MPa. The geometries provided a combined shaft work of 8.7 kW at combined expander efficiency of 89% accounting for the losses due to the leakage in the expander.
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Papers by D. Yogi Y Goswami