Browsing by Author "Zahmatkesh, Iman"

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Citation Count: 1
Effect of rectangular, triangular, and semi-circular hybrid nano phase change material chambers under permanent magnetic field on the stepped solar still efficiency: An experimental study
(Elsevier, 2024) Toosi, Seyed Sina Adibi; Salahshour, Soheıl; Zahmatkesh, Iman; Chaer, Issa; Salahshour, Soheil; Toghraie, D.
Water has been considered one of the most important human needs since the beginning of human existence. This experimental study investigates the impact of utilizing hybrid nanomaterials (Fe 3 O 4 + Graphene oxide) in phase change material (NPCM) under consideration of magnetic field on the production of a uniquely designed stepped solar still. The major aim of this research is to compare three different geometric hybrid NPCM chambers ' performance on the daily production of the stepped solar still. So 4 cases of experiments have been set and performed, namely, stepped solar still 1. Without NPCM, 2. With rectangular hybrid NPCM chambers, 3. With triangular hybrid NPCM chambers, and 4. With semi-circular hybrid NPCM chambers. To add the hours of the distillation process after sunset, the hybrid NPCM was applied. Cases 2 to 4 were experimented with under the permanent magnetic field, too. The daily productivity of Case 1, Case 2, Case 3, and Case 4 without magnetic field were 900 ml/day, 1580 ml/day, 1663 ml/day, and 1730 ml/day, respectively. The outputs indicated that Case 4 had the best accomplishment among all experiment cases. Case 4 of the experiment under the magnetic field yielded the highest daily efficiency of 15.6 %, whereas Case 1 only achieved 7 %. The daily productivity of the stepped solar still with semi-circular NPCM chamber, triangular NPCM chamber, and rectangular NPCM chamber has been enhanced by 92 %, 85 %, and 75 % without magnetic field and 131 %, 113 %, and 100 % under permanent magnetic field, respectively.
Citation Count: 0
Experimental optimization of the performance of a plate heat exchanger with Graphene oxide/water and Al2O3/water 2 O 3 /water nanofluids
(Elsevier, 2024) Behrozifard, A.; Salahshour, Soheıl; Zahmatkesh, Iman; Chaer, Issa; Salahshour, Soheil; Toghraie, D.
The heating and cooling process is a major industrial challenge. The efforts to improve the design of heat transfer improvement mainly center around expanding the heat transfer area (through the geometry of the heat exchanger) and inducing turbulence to eliminate the boundary layer. A solution to increase the thermal efficiency of the heat exchanger and reduce costs is the use of materials such as nanofluids with ideal thermal and thermophysical properties. Here, to enhance the effectiveness of nanofluids and prevent sedimentation, atomic stabilization was the main focus by combining surfactants with nanofluids at specific weight concentrations and applying ultrasonic vibrations to increase stability. In this paper, the influence of using Graphene oxide (GO)/water and AL2O3/waternanofluids 2 O 3 /waternanofluids and the GO-AL2O3 2 O 3 /water hybrid nanofluid was investigated at 0.01 %, 0.02 %, 0.03% wt concentrations. The effect on heat transfer and thermal efficiency of a plate heat exchanger relative to the base fluid (water) was examined. The nanofluids were stabilized in several stages to optimize the thermodynamic properties of the base fluid. The thermal efficiency of the nanofluids (eta) eta ) reaches to its maximum at the highest weight concentration (0.03 %) with GO nanoparticles at 37 %, AL2O3 2 O 3 at 21 %, and the GO-AL2O3 2 O 3 hybrid at 26 %. GO nanoparticles had the most significant impact on the heat exchanger performance, with an optimized heat exchanger performance of 15.94%, followed by the hybrid at 11.86%, and AL2O3 2 O 3 at 7.4 %.