Journal of Thermal Analysis and Calorimetry
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View factor for radiative heat transfer calculations between triangular geometries with common edge
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 4523-4539 - 2023
In radiation heat transfer calculations, the view factor between surfaces is an element of vital importance. Currently, the available technical literature does not have an analytical expression that allows the view factor to be directly computed for combinations of triangular surfaces. An analytical view factor solution requires the addition of multiple integrals, given the changes in the integrat......
Comparison of NIR spectroscopy coupled to chemometrics and derivative thermogravimetry for relative dating of human fossil bones
Journal of Thermal Analysis and Calorimetry - Tập 130 - Trang 559-565 - 2017
The possibility of using near-infrared spectroscopy (NIR) coupled to chemometric exploratory data processing in order to obtain a fast, cheap and nondestructive dating of human fossil bones is presented and discussed. The proposed approach has been applied to the differentiation of human fossil bones from two necropolises in the Middle Nile (Saggai and Geili). Principal component analysis of the s......
Thermal behavior of Ca2+ and Cu2+ oxalates obtained by precipitation in homogeneous solution from dimethyl oxalate hydrolysis
Journal of Thermal Analysis and Calorimetry - Tập 117 - Trang 1145-1150 - 2014
Mixed calcium and copper oxalates, with different proportions of Ca2+ and Cu2+ ions, were precipitated by dimethyl oxalate hydrolysis in homogeneous solution. The compounds were evaluated by means of scanning electron microscopy, energy dispersive X-ray spectroscopy, thermogravimetry (TG), and differential thermal analysis (DTA). The results suggested quantitative precipitation without solid solut......
Betulonic acid—cyclodextrins inclusion complexes
Journal of Thermal Analysis and Calorimetry - Tập 138 - Trang 2787-2797 - 2019
Betulonic acid (BA) is a pentacyclic lupane-type triterpenoid possessing valuable pharmacological activities, exhibiting very low water solubility. Inclusion complexes between the substance and cyclodextrins (CDs) were obtained in order to improve its solubility and consequently its bioavailability. The aim of this study was to investigate the guest–host interaction of BA with γ-cyclodextrin (γ-CD......
Numerical investigation of the mixed convection of a magnetic nanofluid in an annulus between two vertical concentric cylinders under the influence of a non-uniform external magnetic field
Journal of Thermal Analysis and Calorimetry - Tập 138 - Trang 1745-1759 - 2019
In the present study, the hydrothermal behavior of a magnetic nanofluid (4 vol% magnetite–water) in the annular space between two vertical circular cylinders under the influence of a linear magnetic field with negative gradient is numerically investigated. In particular, the effects of the Grashof number (1000 ≤ Gr ≤ 50,000), Reynolds number (20 ≤ Re ≤ 200), and the annulus radius ratio (1.5 ≤ Do/......
Significance of bioconvection in chemical reactive flow of magnetized Carreau–Yasuda nanofluid with thermal radiation and second-order slip
Journal of Thermal Analysis and Calorimetry - Tập 140 - Trang 1293-1306 - 2020
Several non-Newtonian fluids are of practical interest, and it is fascinating to examine the rheology of such fluids with various flow features. In this study, the flow of Carreau–Yasuda nanofluid has been analyzed in the presence of gyrotactic microorganisms. The impressive features of nanofluid are displayed by abiding the thermophoresis and Brownian motion aspects. The second-order velocity sli......
Convective hot air drying of grapes: drying kinetics, mathematical modeling, energy, thermal analysis
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 6893-6908 - 2023
This study aimed to evaluate the experiment of drying grapes that applied three different airflow patterns: vertical and two horizontal (HMP-1 and HMP-2) inside convective hot air dryers. Experiments were conducted using a forced convection dryer at 40–60 °C and air velocities range of 1.0–2 m s−1 to dried grapes. The drying time was significantly decreased due to the greater air velocity and temp......
Investigation of the unsteady characteristic in a scroll compressor of a heat pump system for electric vehicles
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 965-976 - 2022
The scroll compressor is widely utilized in the heat pump air-conditioning of electric vehicles. However, the scroll compressor cannot show a good performance in low ambient. This work presents three-dimensional transient simulation models of no-injection and vapor-injection scroll compressors to investigate the internal flow characteristics using R134a. The different shapes of the vapor-injection......
Numerical investigations of a solar energy heat transfer performances with experimental validations in a water-based serpentine photovoltaic-thermal (PVT) collector
Journal of Thermal Analysis and Calorimetry - Tập 148 - Trang 2149-2169 - 2022
The Korea government announced an expansion of electricity generation ratio to 20% by 2030 from renewable energy. PVT (photovoltaic thermal) has a great potential to be used as a renewable and clean solar energy. In current article, in order to investigate and analysis solar heat transfer performance, numerical simulation of 3-D computational fluid dynamics (CFD) modeling was carried out using com......
Influence of oxidative injury and monitoring of blood plasma by DSC on patients with psoriasis
Journal of Thermal Analysis and Calorimetry - Tập 123 - Trang 2037-2043 - 2015
Oxidative stress induced by oxygen free radicals (OFRs) is a casual factor in psoriasis. Our aim was to detect the oxidative stress parameters and blood plasma changes with differential scanning calorimetry (DSC) in psoriatic patients. The study included untreated (n = 39) and treated (retinoids, methotrexate, biologic response modifiers; n = 33) white adult patients from both sex. To monitor oxi......
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