Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins

Micro gap heat sinks with internal micro fins are potential candidates for evaporative cooling of miniature electronic devices. Generation of turbulence during flow boiling in a micro gap is an important issue in two-phase heat transfer analysis. Surface roughness and fins play important role in t...

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Main Authors: Ahmed, Shugata, Ismail, Ahmad Faris, Sulaeman, Erwin, Hassan, Muhammad Hasibul
Format: Article
Language:English
English
Published: Asian Research Publishing Network (ARPN) 2016
Subjects:
Online Access:http://irep.iium.edu.my/49291/
http://irep.iium.edu.my/49291/
http://irep.iium.edu.my/49291/1/jeas_0116_3353.pdf
http://irep.iium.edu.my/49291/4/49291_Study%20on%20turbulent%20characteristics%20of%20flow%20boiling%20in%20a%20micro%20gap_Scopus.pdf
id iium-49291
recordtype eprints
spelling iium-492912017-04-13T04:32:46Z http://irep.iium.edu.my/49291/ Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins Ahmed, Shugata Ismail, Ahmad Faris Sulaeman, Erwin Hassan, Muhammad Hasibul TJ Mechanical engineering and machinery Micro gap heat sinks with internal micro fins are potential candidates for evaporative cooling of miniature electronic devices. Generation of turbulence during flow boiling in a micro gap is an important issue in two-phase heat transfer analysis. Surface roughness and fins play important role in turbulence generation. In this paper, effects of micro gap height, surface roughness and fin spacing on turbulence generation during flow boiling of pure water in this particular heat sink have been investigated by numerical simulation. Commercial software FLUENT 14.5 release has been used for simulation purpose. Volume of Fluid (VOF) model along with Renormalization Group Theory (RNG) based k − ε turbulence model has been used for fluid flow and heat transfer modeling. Simulation results demonstrate that turbulent kinetic energy increases in the flow direction due to large pressure drop inside micro gap. As pressure drop decreases with the increment of gap height, turbulent kinetic energy also declines. For the same reason, it has been found that generation of turbulent kinetic energy is lower for larger fin spacing. On the other hand, effect of surface roughness on turbulent kinetic energy is dominated by flow scale. For same Reynolds number, turbulence in larger fluid domains is more sensitive to surface roughness than smaller flow fields. Asian Research Publishing Network (ARPN) 2016-01-10 Article PeerReviewed application/pdf en http://irep.iium.edu.my/49291/1/jeas_0116_3353.pdf application/pdf en http://irep.iium.edu.my/49291/4/49291_Study%20on%20turbulent%20characteristics%20of%20flow%20boiling%20in%20a%20micro%20gap_Scopus.pdf Ahmed, Shugata and Ismail, Ahmad Faris and Sulaeman, Erwin and Hassan, Muhammad Hasibul (2016) Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins. ARPN Journal of Engineering and Applied Sciences, 11 (1). pp. 410-414. ISSN 1819-6608 http://www.arpnjournals.org/jeas/research_papers/rp_2016/jeas_0116_3353.pdf
repository_type Digital Repository
institution_category Local University
institution International Islamic University Malaysia
building IIUM Repository
collection Online Access
language English
English
topic TJ Mechanical engineering and machinery
spellingShingle TJ Mechanical engineering and machinery
Ahmed, Shugata
Ismail, Ahmad Faris
Sulaeman, Erwin
Hassan, Muhammad Hasibul
Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
description Micro gap heat sinks with internal micro fins are potential candidates for evaporative cooling of miniature electronic devices. Generation of turbulence during flow boiling in a micro gap is an important issue in two-phase heat transfer analysis. Surface roughness and fins play important role in turbulence generation. In this paper, effects of micro gap height, surface roughness and fin spacing on turbulence generation during flow boiling of pure water in this particular heat sink have been investigated by numerical simulation. Commercial software FLUENT 14.5 release has been used for simulation purpose. Volume of Fluid (VOF) model along with Renormalization Group Theory (RNG) based k − ε turbulence model has been used for fluid flow and heat transfer modeling. Simulation results demonstrate that turbulent kinetic energy increases in the flow direction due to large pressure drop inside micro gap. As pressure drop decreases with the increment of gap height, turbulent kinetic energy also declines. For the same reason, it has been found that generation of turbulent kinetic energy is lower for larger fin spacing. On the other hand, effect of surface roughness on turbulent kinetic energy is dominated by flow scale. For same Reynolds number, turbulence in larger fluid domains is more sensitive to surface roughness than smaller flow fields.
format Article
author Ahmed, Shugata
Ismail, Ahmad Faris
Sulaeman, Erwin
Hassan, Muhammad Hasibul
author_facet Ahmed, Shugata
Ismail, Ahmad Faris
Sulaeman, Erwin
Hassan, Muhammad Hasibul
author_sort Ahmed, Shugata
title Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
title_short Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
title_full Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
title_fullStr Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
title_full_unstemmed Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
title_sort study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins
publisher Asian Research Publishing Network (ARPN)
publishDate 2016
url http://irep.iium.edu.my/49291/
http://irep.iium.edu.my/49291/
http://irep.iium.edu.my/49291/1/jeas_0116_3353.pdf
http://irep.iium.edu.my/49291/4/49291_Study%20on%20turbulent%20characteristics%20of%20flow%20boiling%20in%20a%20micro%20gap_Scopus.pdf
first_indexed 2023-09-18T21:09:43Z
last_indexed 2023-09-18T21:09:43Z
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