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Your search keyword '"Jassim, Esam I."' showing total 20 results
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20 results on '"Jassim, Esam I."'

9. Energy and exergy analyses to enhance the performance of coiled-tube heat exchanger by employing water/Al2O3nanofluid

Author

Jassim, Esam I.

Abstract

The purpose of this research is to experimentally evaluate the degree of enhancement in the heat transfer and entropy generation when nanoparticles mix with ordinary water. Several concentrations of Al2O3nanoparticles at various flowrates are investigated to assess the enhancement in the exchanger's (NTU) and efficiency. Results illustrate that the heat exchanger performance enhances up to 27% due to presence of nanoparticles and is supplemented with the increase of the volume fraction as well as the nanofluid flowrate. Numerically speaking, the total irreversibility decreases by 47% at volume concentration of 0.5% although the frictional source augments by 27%.

Published
2023
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19. Numerical Study on Skin Friction and Shock Inception in Various Geometries of Supersonic Nozzle.

Author

Jassim, Esam I.

Subjects
*SUPERSONIC nozzles, *FRICTIONAL resistance (Hydrodynamics), *SHOCK waves, *COMPUTATIONAL fluid dynamics, *STOCHASTIC convergence
Abstract

In the present study, a numerical simulation is conducted to predict the influence of convergent-divergent nozzle geometry and NPR on the skin friction and shockwave location. Various shapes of nozzles are numerically simulated using the Computational Fluid Dynamics code. The shock position is examined to demonstrate the impact of nozzle shape on its location. Skin friction is shown to be smoothly decreasing at the divergent part of the nozzle for all NPRs lower than 2.0. However, an inverse behavioural trend was observed at NPR equal to 2. This could be attributed to the fact that the large disturbance of fluid near the wall is the major factor behind such an oddity. The results also show that the shock position is reliant on the nozzle geometry at certain NPR. [ABSTRACT FROM AUTHOR]

Published
2017
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