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 tur...

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Main Authors:	Ahmed, Shugata, Ismail, Ahmad Faris, Sulaeman, Erwin, Hasan, Muhammad Hasibul
Format:	Conference or Workshop Item
Language:	English English
Published:	2015
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://irep.iium.edu.my/46475/ http://irep.iium.edu.my/46475/ http://irep.iium.edu.my/46475/1/STUDY_ON_TURBULENT_CHANRACTERISTICS_OF_FLOW_BOILING_IN_A_MICRO_GAP_UNDER_THE_INFLUENCE_OF_SURFACE_ROUGHNESS_AND_MICRO_FINS_%281%29.pdf http://irep.iium.edu.my/46475/5/IPCER_2015_Parallel_Session.pdf

id	iium-46475
recordtype	eprints
spelling	iium-464752018-06-25T04:20:32Z http://irep.iium.edu.my/46475/ 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 Hasan, 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 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. 2015-10-27 Conference or Workshop Item PeerReviewed application/pdf en http://irep.iium.edu.my/46475/1/STUDY_ON_TURBULENT_CHANRACTERISTICS_OF_FLOW_BOILING_IN_A_MICRO_GAP_UNDER_THE_INFLUENCE_OF_SURFACE_ROUGHNESS_AND_MICRO_FINS_%281%29.pdf application/pdf en http://irep.iium.edu.my/46475/5/IPCER_2015_Parallel_Session.pdf Ahmed, Shugata and Ismail, Ahmad Faris and Sulaeman, Erwin and Hasan, Muhammad Hasibul (2015) Study on turbulent characteristics of flow boiling in a micro gap under the influence of surface roughness and micro fins. In: International Postgraduate Conference on Engineering Research (IPCER) 2015 , 27th-28th Oct. 2015, International Islamic University Malaysia (IIUM), Gombak, Kuala Lumpur. http://www.iium.edu.my/ipcer/15/index.php/parallel-session
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 Hasan, 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 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	Conference or Workshop Item
author	Ahmed, Shugata Ismail, Ahmad Faris Sulaeman, Erwin Hasan, Muhammad Hasibul
author_facet	Ahmed, Shugata Ismail, Ahmad Faris Sulaeman, Erwin Hasan, 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
publishDate	2015
url	http://irep.iium.edu.my/46475/ http://irep.iium.edu.my/46475/ http://irep.iium.edu.my/46475/1/STUDY_ON_TURBULENT_CHANRACTERISTICS_OF_FLOW_BOILING_IN_A_MICRO_GAP_UNDER_THE_INFLUENCE_OF_SURFACE_ROUGHNESS_AND_MICRO_FINS_%281%29.pdf http://irep.iium.edu.my/46475/5/IPCER_2015_Parallel_Session.pdf
first_indexed	2023-09-18T21:06:11Z
last_indexed	2023-09-18T21:06:11Z
_version_	1777410948431085568

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

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