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34 results on '"Armaghani, Taher"'

18. Role of Rotating Cylinder toward Mixed Convection inside a Wavy Heated Cavity via Two-Phase Nanofluid Concept

Author

Alsabery, Ammar I., Ghalambaz, Mohammad, Armaghani, Taher, Chamkha, Ali, Hashim, Ishak, Saffari Pour, Mohsen, Alsabery, Ammar I., Ghalambaz, Mohammad, Armaghani, Taher, Chamkha, Ali, Hashim, Ishak, and Saffari Pour, Mohsen

Abstract

The mixed convection two-phase flow and heat transfer of nanofluids were addressed within a wavy wall enclosure containing a solid rotating cylinder. The annulus area between the cylinder and the enclosure was filled with water-alumina nanofluid. Buongiorno's model was applied to assess the local distribution of nanoparticles in the host fluid. The governing equations for the mass conservation of nanofluid, nanoparticles, and energy conservation in the nanofluid and the rotating cylinder were carried out and converted to a non-dimensional pattern. The finite element technique was utilized for solving the equations numerically. The influence of the undulations, Richardson number, the volume fraction of nanoparticles, rotation direction, and the size of the rotating cylinder were examined on the streamlines, heat transfer rate, and the distribution of nanoparticles. The Brownian motion and thermophoresis forces induced a notable distribution of nanoparticles in the enclosure. The best heat transfer rate was observed for 3% volume fraction of alumina nanoparticles. The optimum number of undulations for the best heat transfer rate depends on the rotation direction of the cylinder. In the case of counterclockwise rotation of the cylinder, a single undulation leads to the best heat transfer rate for nanoparticles volume fraction about 3%. The increase of undulations number traps more nanoparticles near the wavy surface., QC 20200818

Published
2020
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34. EFFECTS OF NANOPARTICLE VOLUME FRACTION IN HYDRODYNAMIC AND THERMAL CHARACTERISTICS OF FORCED PLANE JET.

Author

Maghrebi, Mohammad Javad, Armaghani, Taher, and Talebi, Farhad

Subjects
*NANOPARTICLES, *HYDRODYNAMICS, *JET planes, *COMPUTER simulation, *REYNOLDS stress, *NANOFLUIDS
Abstract

The effects of nanoparticle volume fraction in hydrodynamic and thermal characteristics of an incompressible forced 2-D plane jet flow are investigated. Direct numerical simulation of a 2-D incompressible plane forced jet flow for two nanofluids has been performed. The base fluid is water and the nanoparticles are AI2O3 and CuO. The numerical simulation is carried out for the solid volume fraction between 0 to 4%. The results for both nanofluids indicate that any increase in the solid volume fraction decreases the amplitude of temperature, velocity time histories, the turbulent intensities, and that of the Reynolds stresses. The results for both two nanoparticles also indicate that with any increase in nanoparticle volume fraction, the velocity amplitude of velocity time history, the turbulent intensities, and Reynolds stress in Al2O3-water are greater than that of CuO-water nanofluid. [ABSTRACT FROM AUTHOR]

Published
2012
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