The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform
Gregory W Baxter - One of the best experts on this subject based on the ideXlab platform.
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fluorescence intensity ratio technique for optical fiber Point Temperature sensing
Journal of Applied Physics, 2003Co-Authors: Scott A Wade, Stephen F Collins, Gregory W BaxterAbstract:The fluorescence intensity ratio technique for optical fiber-based Point Temperature sensing is reviewed, including the materials suitable for this technique. The Temperature dependence of the fluorescence intensity ratio has been studied using thermally coupled energy levels in seven different rare earth ions doped into a variety of glasses and crystals. Sensor prototypes developed using Pr3+:ZBLANP, Nd3+-doped silica fiber and Yb3+-doped silica fiber as the sensing material have been used to measure Temperatures covering the range of approximately −50 to 600 °C with a resolution of the order of 1 °C.
G H Tang - One of the best experts on this subject based on the ideXlab platform.
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prediction of sulfuric acid dew Point Temperature on heat transfer fin surface
Applied Thermal Engineering, 2016Co-Authors: Yibin Wang, G H TangAbstract:Abstract Sulfuric acid dew Point Temperature is an important parameter denoting the dew Point corrosion. The sulfuric acid dew Point Temperature is calculated by considering both the vapor–liquid equilibrium effect and multi-component diffusion effect. In addition, the local distribution of acid dew Point Temperature on fin surface is numerically predicted for the first time. The influences of fuel type (sulfur content, water content and ash content), wall Temperature, excess air ratio, flue gas inlet velocity, fly ash particle (size and quantity) and heat transfer fin structure on the sulfuric acid dew Point Temperature are discussed. The results show that different types of fuels (which differ in gas composition and combustion Temperature) have a great impact on the sulfuric acid dew Point Temperature. The sulfuric acid dew Point Temperature decreases with the reduction of excess air ratio, the increasing of wall Temperature, and the condensation of sulfuric acid vapor on ash particle surface. The sulfuric acid vapor condensates more seriously on the tube windward than on the leeward. The novel types of heat transfer fins with high heat transfer performance can also reduce the local sulfuric acid dew Point Temperature, and the maximum reduction of sulfuric acid dew Point is 4.1 K between the novel fin surface and the original H-type fin surface.
Luis Paulo N Rebelo - One of the best experts on this subject based on the ideXlab platform.
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solubility of fluorinated compounds in a range of ionic liquids cloud Point Temperature dependence on composition and pressure
Green Chemistry, 2008Co-Authors: Rui Cruz Ferreira, Marijana Blesic, Joana R Trindade, Isabel M Marrucho, Jose Canongia N Lopes, Luis Paulo N RebeloAbstract:In this work, we explore the mutual solubility of a number of mixtures of commonly used ionic liquids (imidazolium, pyridinium, phosphonium and ammonium ionic liquids) with partially fluorinated n-alcohols (C7 to C10) or perfluoroheptane. The corresponding T–x diagrams at atmospheric pressure were measured through cloud-Point Temperature determinations. For some selected systems under near-critical isopleth conditions, pressure effects were also studied. The results are discussed in terms of (i) shifts in the immiscibility envelopes as the cation alkyl-chain length is changed, (ii) the nature of the cation or the anion, (iii) the increasing length of the fluorinated/alkylic moiety of the partially fluorinated alcohol, or (iv) comparisons with similar systems involving normal alcohols.
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salting out effects in aqueous ionic liquid solutions cloud Point Temperature shifts
Journal of Physical Chemistry B, 2007Co-Authors: Joana R Trindade, Marijana Blesic, Isabel M Marrucho, Jose Canongia N Lopes, Zoran P Visak, Joao A P Coutinho, Luis Paulo N RebeloAbstract:The effects of the addition of three inorganic salts, namely, NaCl, Na2SO4, and Na3PO4, on the liquid−liquid (L−L) phase diagram of aqueous solutions containing the model ionic liquid 1-butyl-3-methylimidazolium tetrafluoroborate, [bmim][BF4], were investigated. All three inorganic salts trigger salting-out effects, leading to significant upward shifts of the L−L demixing Temperatures of the systems. The magnitude of the shifts depends on both the water-structuring nature of the salt and its concentration; that is, the effects are correlated with the ionic strength of the solution and the Gibbs free energy of hydration of the inorganic salt. The pH effect and the occurrence of salt precipitation in concentrated solutions are also discussed.
Scott A Wade - One of the best experts on this subject based on the ideXlab platform.
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fluorescence intensity ratio technique for optical fiber Point Temperature sensing
Journal of Applied Physics, 2003Co-Authors: Scott A Wade, Stephen F Collins, Gregory W BaxterAbstract:The fluorescence intensity ratio technique for optical fiber-based Point Temperature sensing is reviewed, including the materials suitable for this technique. The Temperature dependence of the fluorescence intensity ratio has been studied using thermally coupled energy levels in seven different rare earth ions doped into a variety of glasses and crystals. Sensor prototypes developed using Pr3+:ZBLANP, Nd3+-doped silica fiber and Yb3+-doped silica fiber as the sensing material have been used to measure Temperatures covering the range of approximately −50 to 600 °C with a resolution of the order of 1 °C.
Isam H Aljundi - One of the best experts on this subject based on the ideXlab platform.
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effect of dry hydrocarbons and critical Point Temperature on the efficiencies of organic rankine cycle
Renewable Energy, 2011Co-Authors: Isam H AljundiAbstract:Higher efficiencies and optimal utilization of geothermal energy require a careful selection of the working fluid in organic Rankine cycles (ORC). The objectives of this study are to analyze and explain the effect of using alternative dry fluids on the efficiencies of the ORC and compare them with other refrigerants. In addition, the effect of the critical Temperature on the thermal and exergetic efficiencies will also be determined. Results showed that iso-pentane is a good replacement for R-113, while neo-pentane outperformed C5F12. In addition, n-butane showed better efficiency than RC-318, R-236fa, and R-245fa. The best working fluid in the studied system was n-hexane, while R-227ea was the worst. It was also found that efficiencies correlate with the critical Temperature of the working fluid where a strong functionality was noticed in the studied range. The contribution of the evaporator to the total exergy destruction was the most relevant, while the pump contribution was marginal. It is concluded that thermodynamically, hydrocarbons are superior to some refrigerants and could be the next generation working fluids for geothermal or waste heat recovery systems.
