The Experts below are selected from a list of 37056 Experts worldwide ranked by ideXlab platform
Allan N. Soriano - One of the best experts on this subject based on the ideXlab platform.
-
Thermophysical Property characterization of aqueous amino acid salt solutions containing α aminobutyric acid
The Journal of Chemical Thermodynamics, 2015Co-Authors: Alexis A R Garcia, Rhoda B. Leron, Allan N. SorianoAbstract:Abstract In this study, density, electrical conductivity, refractive index and viscosity of aqueous potassium and sodium salt solutions of α-aminobutyric acid were presented. Measurements were done over the temperature range (303.15 to 343.15) K and atmospheric pressure for salt compositions from x1 = 0.009 to 0.062. A modified Graber et al. equation was used to correlate the density, electrical conductivity, and refractive index with temperature and composition leading to average absolute deviations (AAD) between the predicted and calculated values of 0.04%, 0.7%, and 0.01%, respectively. The viscosity data were represented as a function of temperature and composition via Vogel–Tamman–Fulcher (VTF) type equation at an AAD of 0.6%.
-
Thermophysical Property characterization of aqueous amino acid salt solution containing serine
The Journal of Chemical Thermodynamics, 2014Co-Authors: Shanille S. Navarro, Rhoda B. Leron, Allan N. SorianoAbstract:Abstract Thermophysical Property characterization of aqueous potassium and sodium salt solutions containing serine was conducted in this study; specifically the system’s density, refractive index, electrical conductivity, and viscosity. Measurements were obtained over a temperature range of (298.15 to 343.15) K and at normal atmospheric pressure. Composition range from x 1 = 0.009 to 0.07 for aqueous potassium and sodium salt solutions containing serine was used. The sensitivity of the system’s Thermophysical properties on temperature and composition variation were discussed and correlated based on the equations proposed for room temperature ionic liquids. The density, viscosity, and refractive index measurements of the aqueous systems were found to decrease as the temperature increases at fixed concentration and the values increase as the salt concentration increases (water composition decreases) at fixed temperature. Whereas, a different trend was observed for the electrical conductivity data; at fixed concentration, the conductivity values increase as the temperature increases and at fixed temperature, its value generally increases as the salt concentration increases but only to a certain level (specific concentration) wherein the conductivity of the solution starts to decrease when the concentration of the salt is further increased. Calculation results show that the applied models were satisfactory in representing the measured properties in the aqueous amino acid salt solution containing serine.
-
Thermophysical Property characterization of tris(hydroxymethyl)aminomethane
The Journal of Chemical Thermodynamics, 2011Co-Authors: Allan N. Soriano, Denise Irene V. CabahugAbstract:Abstract In this present work, a Thermophysical Property characterization of aqueous solution of tris(hydroxymethyl)aminomethane (TRIS), a biological buffer, was done. The investigated properties were refractive index (n), density (ρ), and electrolytic conductivity (κ). These properties were measured for temperatures up to 353.15 K (at normal atmospheric condition) and for the entire composition range where TRIS is still soluble in water. The measured properties were reported as functions of temperature and composition. A modified form of the Vogel–Tamman–Fulcher equation which leads to an Arrhenius-type asymptotic exponential function was used to generally correlate the temperature and compositional dependence of the considered properties and satisfactory results were obtained.
Tetsuya Baba - One of the best experts on this subject based on the ideXlab platform.
-
development of network database system for Thermophysical Property data of thin films
Japanese Journal of Applied Physics, 2011Co-Authors: Yuichiro Yamashita, Takashi Yagi, Tetsuya BabaAbstract:The database system for Thermophysical Property data, which has been developed by the National Metrology Institute of Japan (NMIJ), is evolved to store comprehensive information on thin films. Since a thin film is identified by not only its constituent elements, phases, or compositions but also its method of synthesis, a strategy for storing all thin-film specimens is adopted when the data are measured by NMIJ. In addition, new criteria of material classification in our database are introduced to systematically manage material information on multilayer thin-film specimens. For example, when a multi layered film is measured by an ultrafast laser flash method, the database stores not only analyzed results but also data at various measurement stages, which can follow analysis steps from an observed signal data to derived results: thermal diffusivity and boundary thermal resistance of the film. In order to store new data items, the database system has been updated. The updated database system is demonstrated in terms of its storage of record items and its user interface using a set of Thermophysical Property data of a "TiN single-layer thin film on a synthesized quartz substrate", "Al2O3 coated with Mo three-layer thin films on a fused silica substrate", and "ITO coated with Mo three-layer thin films on a fused silica substrate". This database system is available at http://riodb.ibase.aist.go.jp/TPDB/DBGVsupport/index_en.html.
-
Measurements and data of Thermophysical properties traceable to a metrological standard
Metrologia, 2010Co-Authors: Tetsuya BabaAbstract:In order to improve the performance of devices, components and systems, where heat is generated, transported, stored or converted to other types of energy, reliable thermal design and simulation are required using reliable Thermophysical Property data. In order to produce reliable Thermophysical Property data systematically and continually, the international and national standards of Thermophysical properties must be established and the measurement methods should be evaluated and standardized, and the measuring instruments must be calibrated by reference materials traceable to the international or national standard.Users search for and purchase a particular grade of material which satisfies the properties, performances and technical specifications required. In order to guarantee fair commerce and trade, values of Thermophysical properties should be measured traceable to the national standard. Thus, the establishment of an international standard is required satisfying the global CIPM MRA under the metric convention, and then, the global and regional framework to examine calibration and measurement capability of national metrology institutes (NMIs). A domestic traceability system in each country should be established and the quality management system of the NMI and calibration laboratories should be constructed based on ISO 17025.
-
electrical delay technique in the picosecond thermoreflectance method for Thermophysical Property measurements of thin films
Review of Scientific Instruments, 2005Co-Authors: Naoyuki Taketoshi, Tetsuya Baba, Akira OnoAbstract:A new picosecond thermoreflectance measurement system using an electrical delay control has been developed in order to extend observation time of temperature response of thin films after pulse heating. The new system uses two picosecond titanium sapphire lasers, one for heating a specimen and the other for probing temperature change on the film surface. Temperature history of the film surface is observed by changing the delay time of the probe pulse from the pump pulse electrically instead of changing the difference of path length between the pump beam and the probe beam. It is not difficult to observe temperature history over longer time than the repetition period of the picosecond laser pulses using the electrical delay technique. The electrical delay technique can get rid of the fluctuation of focused position of the beam on the specimen surface which is hard to eliminate after traveling through the optical delay line of variable path length. Temperature history curves of sputtered tungsten thin films ...
Brian A. Fricke - One of the best experts on this subject based on the ideXlab platform.
-
Evaluation of Thermophysical Property Models for Foods
Hvac&r Research, 2001Co-Authors: Brian A. Fricke, Bryan R. BeckerAbstract:The Thermophysical properties of foods are required in order to calculate process times and to design equipment for the storage and preservation of food. There are a multitude of food items available, whose properties are strongly dependent upon chemical composition and temperature. Composition-based Thermophysical Property models provide a means of estimating properties of foods as functions of temperature. Numerous models have been developed and the designer of food processing equipment is faced with the challenge of selecting appropriate ones from those available. In this paper selected Thermophysical Property models are quantitatively evaluated by comparison to a comprehensive experimental Thermophysical Property data set compiled from the literature. For ice fraction prediction, the equation by Chen (1985b) performed best, followed closely by that of Tchigeov (1979). For apparent specific heat capacity, the model of Schwartzberg (1976) performed best, and for specific enthalpy prediction, the Chen (1...
-
Food Thermophysical Property models
International Communications in Heat and Mass Transfer, 1999Co-Authors: Bryan R. Becker, Brian A. FrickeAbstract:The design engineer must predict the Thermophysical properties of foods in order to design food storage and refrigeration equipment and estimate process times for refrigerating, freezing, heating or drying of foods. Since the Thermophysical properties of foods are strongly dependent upon chemical composition and temperature, composition based models provide a means of estimating these properties. Numerous models of this type have been proposed and the designer of food processing equipment is thus faced with the challenge of selecting appropriate models from the plethora of those available. This paper describes selected food Thermophysical Property models and evaluates their performance by comparing their results to experimental Thermophysical Property data. The results given in this paper will be of value to the design engineer in the selection of appropriate food Thermophysical Property models.
Muhammet S Toprak - One of the best experts on this subject based on the ideXlab platform.
-
Fabrication, Characterization and Thermophysical Property Evaluation of SiC Nanofluids for Heat Transfer Applications
Nano-Micro Letters, 2014Co-Authors: Nader Nikkam, Mohsin Saleemi, Morteza Ghanbarpour, Rahmatollah Khodabandeh, Mamoun Muhammed, Ehsan Bitaraf Haghighi, Bjorn Palm, Muhammet S ToprakAbstract:Nanofluids (NFs) are nanotechnology-based colloidal suspensions fabricated by suspending nanoparticles (NPs) in a base liquid. These fluids have shown potential to improve the heat transfer properties of conventional heat transfer fluids. In this study we report in detail on fabrication, characterization and thermo-physical Property evaluation of SiC NFs, prepared using SiC NPs with different crystal structures, for heat transfer applications. For this purpose, a series of SiC NFs containing SiC NPs with different crystal structure (α-SiC and β-SiC) were fabricated in a water (W)/ethylene glycol (EG) mixture (50/50 wt% ratio). Physicochemical properties of NPs/NFs were characterized by using various techniques, such as powder X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), Fouriertransform infrared spectroscopy (FTIR), dynamic light scattering (DLS) and Zeta potential analysis. Thermo-physical properties including thermal conductivity (TC) and viscosity for NFs containing SiC particles (α- and β- phase) were measured. The results show among all suspensions NFs fabricated with α-SiC particles have more favorable thermo-physical properties compared to the NFs fabricated with β-SiC.The observed difference is attributed to combination of several factors, including crystal structure (β- vs. α-), sample purity, and residual chemicals exhibited on SiCNFs. A TC enhancement of ~20% while 14% increased viscosity were obtained for NFs containing 9 wt% of particular type of α-SiC NPs indicating promising capability of this kind of NFs for further heat transfer characteristics investigation.
Rhoda B. Leron - One of the best experts on this subject based on the ideXlab platform.
-
Thermophysical Property characterization of aqueous amino acid salt solutions containing α aminobutyric acid
The Journal of Chemical Thermodynamics, 2015Co-Authors: Alexis A R Garcia, Rhoda B. Leron, Allan N. SorianoAbstract:Abstract In this study, density, electrical conductivity, refractive index and viscosity of aqueous potassium and sodium salt solutions of α-aminobutyric acid were presented. Measurements were done over the temperature range (303.15 to 343.15) K and atmospheric pressure for salt compositions from x1 = 0.009 to 0.062. A modified Graber et al. equation was used to correlate the density, electrical conductivity, and refractive index with temperature and composition leading to average absolute deviations (AAD) between the predicted and calculated values of 0.04%, 0.7%, and 0.01%, respectively. The viscosity data were represented as a function of temperature and composition via Vogel–Tamman–Fulcher (VTF) type equation at an AAD of 0.6%.
-
Thermophysical Property characterization of aqueous amino acid salt solution containing serine
The Journal of Chemical Thermodynamics, 2014Co-Authors: Shanille S. Navarro, Rhoda B. Leron, Allan N. SorianoAbstract:Abstract Thermophysical Property characterization of aqueous potassium and sodium salt solutions containing serine was conducted in this study; specifically the system’s density, refractive index, electrical conductivity, and viscosity. Measurements were obtained over a temperature range of (298.15 to 343.15) K and at normal atmospheric pressure. Composition range from x 1 = 0.009 to 0.07 for aqueous potassium and sodium salt solutions containing serine was used. The sensitivity of the system’s Thermophysical properties on temperature and composition variation were discussed and correlated based on the equations proposed for room temperature ionic liquids. The density, viscosity, and refractive index measurements of the aqueous systems were found to decrease as the temperature increases at fixed concentration and the values increase as the salt concentration increases (water composition decreases) at fixed temperature. Whereas, a different trend was observed for the electrical conductivity data; at fixed concentration, the conductivity values increase as the temperature increases and at fixed temperature, its value generally increases as the salt concentration increases but only to a certain level (specific concentration) wherein the conductivity of the solution starts to decrease when the concentration of the salt is further increased. Calculation results show that the applied models were satisfactory in representing the measured properties in the aqueous amino acid salt solution containing serine.
