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Numerical investigation of secondary peaks in Nusselt profile under water jet impingement

In the present work, numerical simulations were conducted to observe the occurrence of secondary peaks in Nusselt profiles, which were generated on the target surface due to the impingement of water. Simulations were carried out in an ANSYS CFX solver by varying the Reynolds number Re from 825 to...

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Main Authors: Siddiqui, Umair, Ansari, Emad, Khan, Sher Afghan, Patil, Rajesh
格式: Article
語言:English
English
出版: American Institute of Aeronautics and Astronautics 2020
主題:
TJ Mechanical engineering and machinery
在線閱讀:http://irep.iium.edu.my/80218/7/80218%20Numerical%20investigation%20of%20secondary%20peaks.pdf
http://irep.iium.edu.my/80218/13/80218_Numerical%20investigation%20of%20secondary%20peaks_SCOPUS.pdf
http://irep.iium.edu.my/80218/
https://arc.aiaa.org/doi/abs/10.2514/1.T5905
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spelling my.iium.irep.802182021-01-18T02:04:29Z http://irep.iium.edu.my/80218/ Numerical investigation of secondary peaks in Nusselt profile under water jet impingement Siddiqui, Umair Ansari, Emad Khan, Sher Afghan Patil, Rajesh TJ Mechanical engineering and machinery In the present work, numerical simulations were conducted to observe the occurrence of secondary peaks in Nusselt profiles, which were generated on the target surface due to the impingement of water. Simulations were carried out in an ANSYS CFX solver by varying the Reynolds number Re from 825 to 41,292 and the nozzle-target spacing (Z∕d) from 0.25 to 4. A k-ε turbulence model with realizable equations having an optimum grid size (minimum face size of 0.0008575 and number of elements of 1,225,616) was incorporated. This computational domain with the mentioned grid size was subjected to various boundary conditions (for plotting the Nusselt profile for different impinging and geometric parameters). It was found that the high velocities of jets with lower nozzle-target spacings were the leading causes for the occurrence of secondary peaks in the Nusselt profile. A nondimensional constant was defined as the ratio of the Reynolds number to the nozzle-target spacing, carrying a threshold magnitude above which secondary peaks in Nusselt profiles were bound to happen. The value of this nondimensional constant �Re∕�Z∕d�� was approximated to 1000. The occurrence of an intermediate transition region due to the imbalance penetrating momentum was the true cause of the occurrence of secondary peaks. This was justified using velocity contours. American Institute of Aeronautics and Astronautics 2020-04-25 Article PeerReviewed application/pdf en http://irep.iium.edu.my/80218/7/80218%20Numerical%20investigation%20of%20secondary%20peaks.pdf application/pdf en http://irep.iium.edu.my/80218/13/80218_Numerical%20investigation%20of%20secondary%20peaks_SCOPUS.pdf Siddiqui, Umair and Ansari, Emad and Khan, Sher Afghan and Patil, Rajesh (2020) Numerical investigation of secondary peaks in Nusselt profile under water jet impingement. Journal of Thermophysics and Heat Transfer, 34 (2 (April-June)). pp. 421-428. ISSN 0887-8722 E-ISSN 1533-6808 https://arc.aiaa.org/doi/abs/10.2514/1.T5905
institution Universiti Islam Antarabangsa Malaysia
building IIUM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider International Islamic University Malaysia
content_source IIUM Repository (IREP)
url_provider http://irep.iium.edu.my/
language English
English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Siddiqui, Umair
Ansari, Emad
Khan, Sher Afghan
Patil, Rajesh
Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
description In the present work, numerical simulations were conducted to observe the occurrence of secondary peaks in Nusselt profiles, which were generated on the target surface due to the impingement of water. Simulations were carried out in an ANSYS CFX solver by varying the Reynolds number Re from 825 to 41,292 and the nozzle-target spacing (Z∕d) from 0.25 to 4. A k-ε turbulence model with realizable equations having an optimum grid size (minimum face size of 0.0008575 and number of elements of 1,225,616) was incorporated. This computational domain with the mentioned grid size was subjected to various boundary conditions (for plotting the Nusselt profile for different impinging and geometric parameters). It was found that the high velocities of jets with lower nozzle-target spacings were the leading causes for the occurrence of secondary peaks in the Nusselt profile. A nondimensional constant was defined as the ratio of the Reynolds number to the nozzle-target spacing, carrying a threshold magnitude above which secondary peaks in Nusselt profiles were bound to happen. The value of this nondimensional constant �Re∕�Z∕d�� was approximated to 1000. The occurrence of an intermediate transition region due to the imbalance penetrating momentum was the true cause of the occurrence of secondary peaks. This was justified using velocity contours.
format Article
author Siddiqui, Umair
Ansari, Emad
Khan, Sher Afghan
Patil, Rajesh
author_facet Siddiqui, Umair
Ansari, Emad
Khan, Sher Afghan
Patil, Rajesh
author_sort Siddiqui, Umair
title Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
title_short Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
title_full Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
title_fullStr Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
title_full_unstemmed Numerical investigation of secondary peaks in Nusselt profile under water jet impingement
title_sort numerical investigation of secondary peaks in nusselt profile under water jet impingement
publisher American Institute of Aeronautics and Astronautics
publishDate 2020
url http://irep.iium.edu.my/80218/7/80218%20Numerical%20investigation%20of%20secondary%20peaks.pdf
http://irep.iium.edu.my/80218/13/80218_Numerical%20investigation%20of%20secondary%20peaks_SCOPUS.pdf
http://irep.iium.edu.my/80218/
https://arc.aiaa.org/doi/abs/10.2514/1.T5905
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score 13.250345

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