Browsing by Publisher "Gheorghe Asachi Technical University of Iasi, Romania"

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    NUMERICAL ANALYSIS OF PULSATING FORCED CONVECTION IN A BACKWARD-FACING STEP FLOW SUBJECTED TO NANOFLUIDS
    (Gheorghe Asachi Technical University of Iasi, Romania, 2021) Çavdar P.S.; Solmaz B.; Selimefendigil F.; Yurddaş A.
    The numerical investigation of pulsating forced convection in a backward-facing step flow using water-based nanofluids has been presented. This study is performed for different Reynolds numbers (based on the step height) in the range of 10 and 200, different inlet velocity and different Strouhal number. The effects of water-based nanofluids, which contain Al2O3 (Aluminium oxide) and Cu (Copper) nanoparticles with volume fractions ranging from 1% to 5%, on the heat transfer were determined. All numerical solutions were evaluated by using the Finite Volume Method of Computational Fluid Dynamics. The effects of related parameters as Reynolds number and pulsating frequency on the fluid flow and heat transfer characteristics have been numerically analyzed. Increasing the Cu nanoparticle volume ratio gets the heat transfer better than of all. © 2021 Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.
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    EFFECTS OF ENVIRONMENTALLY FRIENDLY FLUIDIZED BED DRYING ON THE QUALITY OF Viburnum opulus
    (Gheorghe Asachi Technical University of Iasi, Romania, 2022) Bölek S.; Mercan M.; Vursavaş M.; Arslan D.; Yurddaş A.
    Owing to their high antioxidant activity, fiber, vitamin and mineral content, dried fruits are healthy and nutritious snacks. However, some quality characteristics of fruits are adversely affected by drying. Therefore, drying temperature is very important to obtain healthy and nutritious dried products. Recently, fluidized bed drying technology has been spread all over the world as it is an efficient and environmentally friendly technique. This study investigated the effects of fluidized bed drying, which is a thermodynamic equilibrium drying technique, on quality characteristics of Viburnum opulus. For this aim, the V. opulus fruits were dried at 60°C, 70°C and 80°C with an air flow rate of around 60 m3/h for 5 h, 4 h and 3 h respectively. The moisture contents of V. opulus fruits were reduced by half (for medium-high temperature cases) after 90 min of drying process. Thanks to environmentally friendly fluidized bed drying system, V. opulus fruits moved on the bed during drying. As the fruits did not stay in the same place, heat and mass transfer increased and uniform drying was achieved. Color, rehydration capacity, shrinking ratio, antioxidant activity, pH and sensory analysis were conducted to compare the sensory, chemical and physical properties of dried V. opulus fruits. The drying temperature affected the quality characteristics of V. opulus fruits significantly (p<0.05). The V. opulus fruits dried at 60°C has the highest rehydration capacity and they were the most appreciated samples with regards of appearance, flavor and overall impression among the dried fruits (p<0.05). © 2022 Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.
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    INFLUENCE OF FOREIGN DIRECT INVESTMENT ON CARBON DIOXIDE EMISSIONS IN NEWLY INDUSTRIALIZED COUNTRIES: A PANEL ARDL-PMG APPROACH
    (Gheorghe Asachi Technical University of Iasi, Romania, 2022) Dam M.M.; Gökbunar A.R.; Yildiz B.; Bulut Ş.
    In this study, the effect of foreign direct investment on carbon dioxide emissions was analyzed using annual data for the 1990-2016 period for the newly industrialized countries. The study was analyzed using Panel Pooled Mean Group-Autoregressive distributive lag cointegration test and Dumitrescu and Hurlin panel causality test. As a result of the long-term analysis, the foreign direct investment, energy consumption and trade openness have a positive and significant impact on carbon dioxide emissions whereas economic growth has negative and significant impact on carbon dioxide emissions. It has been analyzed that a 1% increase in foreign direct investment increases carbon dioxide emission by 0.03%. According to Dumitrescu and Hurlin panel causality tests analysis results, a bidirectional causality relationship between energy consumption and carbon dioxide emissions; a unidirectional causality relationship from economic growth and trade openness to carbon dioxide emissions and from carbon dioxide emissions to foreign direct investment has been determined. © 2022 Gheorghe Asachi Technical University of Iasi, Romania. All rights reserved.