Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel

The laminar forced convection heat transfer of water-Al2O3 nanofluids through a horizontal rib-microchannel was studied. The middle section of the down wall of microchannel was at a lower temperature compared to the entrance fluid. Simulations were performed for Reynolds numbers 10 and 100 and nanop...

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Main Authors:	Akbari, O.A., Toghraie, A., Karimipour, A., Safaei, M.R., Goodarzi, M., Alipour, H., Dahari, M.
Format:	Article
Published:	Elsevier 2016
Subjects:	TJ Mechanical engineering and machinery TK Electrical engineering. Electronics Nuclear engineering
Online Access:	https://doi.org/10.1016/j.amc.2016.05.053 https://doi.org/10.1016/j.amc.2016.05.053

id	um-18169
recordtype	eprints
spelling	um-181692017-11-08T07:08:06Z Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel Akbari, O.A. Toghraie, A. Karimipour, A. Safaei, M.R. Goodarzi, M. Alipour, H. Dahari, M. TJ Mechanical engineering and machinery TK Electrical engineering. Electronics Nuclear engineering The laminar forced convection heat transfer of water-Al2O3 nanofluids through a horizontal rib-microchannel was studied. The middle section of the down wall of microchannel was at a lower temperature compared to the entrance fluid. Simulations were performed for Reynolds numbers 10 and 100 and nanoparticle volume fractions of 0.00 to 0.04, inside a two-dimensional rectangular microchannel with 2.5 mm length and 25 μm width. The two-dimensional governing equations were discretized using a finite volume method. The effects of rib's hight and position, nanoparticle concentration and Reynolds number on the thermal and hydraulics behavior of nanofluid flow were investigated. The results were portrayed in terms of velocity, temperature and Nusselt number profiles as well as streamlines and isotherm contours. The model predictions were found to be in good agreements with those from previous studies. The results indicate that the normal internal ribs or turbulators, can significantly enhance the convective heat transfer within a microchannel. However, the added high ribs can cause a larger friction factor, compared to that in the corresponding microchannel with a constant height of the ribs. The results also illustrate that by increasing the rib's heights and volume fraction of nanoparticles, friction coefficient, heat transfer rate and average Nusselt number of the ribbed-microchannels tend to augment. In addition, the simulation results confirm that changing the solid volume fraction and the rib's height, cause significant changes in temperature and dimensionless velocity along the centerline of the flow, through the ribbed areas. Elsevier 2016 Article PeerReviewed https://doi.org/10.1016/j.amc.2016.05.053 Akbari, O.A.; Toghraie, A.; Karimipour, A.; Safaei, M.R.; Goodarzi, M.; Alipour, H.; Dahari, M. (2016) Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel. Applied Mathematics and Computation <http://eprints.um.edu.my/view/publication/Applied_Mathematics_and_Computation.html>, 290. pp. 135-153. ISSN 0096-3003 http://eprints.um.edu.my/18169/
repository_type	Digital Repository
institution_category	Local University
institution	University Malaya
building	UM Research Repository
collection	Online Access
topic	TJ Mechanical engineering and machinery TK Electrical engineering. Electronics Nuclear engineering
spellingShingle	TJ Mechanical engineering and machinery TK Electrical engineering. Electronics Nuclear engineering Akbari, O.A. Toghraie, A. Karimipour, A. Safaei, M.R. Goodarzi, M. Alipour, H. Dahari, M. Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
description	The laminar forced convection heat transfer of water-Al2O3 nanofluids through a horizontal rib-microchannel was studied. The middle section of the down wall of microchannel was at a lower temperature compared to the entrance fluid. Simulations were performed for Reynolds numbers 10 and 100 and nanoparticle volume fractions of 0.00 to 0.04, inside a two-dimensional rectangular microchannel with 2.5 mm length and 25 μm width. The two-dimensional governing equations were discretized using a finite volume method. The effects of rib's hight and position, nanoparticle concentration and Reynolds number on the thermal and hydraulics behavior of nanofluid flow were investigated. The results were portrayed in terms of velocity, temperature and Nusselt number profiles as well as streamlines and isotherm contours. The model predictions were found to be in good agreements with those from previous studies. The results indicate that the normal internal ribs or turbulators, can significantly enhance the convective heat transfer within a microchannel. However, the added high ribs can cause a larger friction factor, compared to that in the corresponding microchannel with a constant height of the ribs. The results also illustrate that by increasing the rib's heights and volume fraction of nanoparticles, friction coefficient, heat transfer rate and average Nusselt number of the ribbed-microchannels tend to augment. In addition, the simulation results confirm that changing the solid volume fraction and the rib's height, cause significant changes in temperature and dimensionless velocity along the centerline of the flow, through the ribbed areas.
format	Article
author	Akbari, O.A. Toghraie, A. Karimipour, A. Safaei, M.R. Goodarzi, M. Alipour, H. Dahari, M.
author_facet	Akbari, O.A. Toghraie, A. Karimipour, A. Safaei, M.R. Goodarzi, M. Alipour, H. Dahari, M.
author_sort	Akbari, O.A.
title	Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
title_short	Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
title_full	Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
title_fullStr	Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
title_full_unstemmed	Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel
title_sort	investigation of rib's height effect on heat transfer and flow parameters of laminar water-al2o3 nanofluid in a rib-microchannel
publisher	Elsevier
publishDate	2016
url	https://doi.org/10.1016/j.amc.2016.05.053 https://doi.org/10.1016/j.amc.2016.05.053
first_indexed	2018-09-06T06:48:32Z
last_indexed	2018-09-06T06:48:32Z
_version_	1610839766200221696

Investigation of rib's height effect on heat transfer and flow parameters of laminar water-Al2O3 nanofluid in a rib-microchannel

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