Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels

Supercritical carbon dioxide (CO2) has special thermal properties with better heat transfer and flow characteristics. Due to this reason, supercritical CO2 is being used recently in air-condition and refrigeration systems to replace non environmental friendly refrigerants. Even though many research...

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Main Authors:	N. T., Rao, A. N., Oumer, Ummu Kulthum, Jamaludin, A. Y., Adam
Format:	Conference or Workshop Item
Language:	English English
Published:	EDP Sciences 2016
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/10212/ http://umpir.ump.edu.my/id/eprint/10212/ http://umpir.ump.edu.my/id/eprint/10212/1/Numerical%20Analysis%20of%20Flow%20and%20Heat%20Transfer%20Characteristics%20of%20CO2%20at%20Vapour%20and%20Supercritical%20Phases%20in%20Micro-Channels..pdf http://umpir.ump.edu.my/id/eprint/10212/7/fkm-2016-rao-Numerical%20Analysis%20of%20Flow%20and%20Heat.pdf

id	ump-10212
recordtype	eprints
spelling	ump-102122018-11-30T02:00:32Z http://umpir.ump.edu.my/id/eprint/10212/ Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels N. T., Rao A. N., Oumer Ummu Kulthum, Jamaludin A. Y., Adam TJ Mechanical engineering and machinery Supercritical carbon dioxide (CO2) has special thermal properties with better heat transfer and flow characteristics. Due to this reason, supercritical CO2 is being used recently in air-condition and refrigeration systems to replace non environmental friendly refrigerants. Even though many researches have been done, there are not many literatures for heat transfer and flow characteristics of supercritical CO2. Therefore, the main purpose of this study is to develop flow and heat transfer CFD models on two different phases; vapour and supercritical of CO2 to investigate the heat transfer characteristics and pressure drop in microchannels. CO2 is considered to be in different phases with different flow pressures but at same temperature. For the simulation, the CO2 flow was assumed to be turbulent, non-isothermal and Newtonian. The numerical results for both phases are compared. From the numerical analysis, for both vapour and supercritical phases, the heat energy from CO2 gas transferred to water to attain thermal equilibrium. The temperature of CO2 at vapour phase decreased 1.78% compared to supercritical phase, which decreased for 0.56% from the inlet temperature. There was a drastic increase of 72% for average Nu when the phase changed from vapour to supercritical. The average Nu decreased rapidly about 41% after total pressure of 9.0MPa. Pressure drop (P) increased together with Reynolds number (Re) for vapour and supercritical phases. When the phase changed from vapour to supercritical,P was increased about 26%. The results obtained from this study can provide information for further investigations on supercritical CO2. EDP Sciences 2016 Conference or Workshop Item PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/10212/1/Numerical%20Analysis%20of%20Flow%20and%20Heat%20Transfer%20Characteristics%20of%20CO2%20at%20Vapour%20and%20Supercritical%20Phases%20in%20Micro-Channels..pdf application/pdf en cc_by http://umpir.ump.edu.my/id/eprint/10212/7/fkm-2016-rao-Numerical%20Analysis%20of%20Flow%20and%20Heat.pdf N. T., Rao and A. N., Oumer and Ummu Kulthum, Jamaludin and A. Y., Adam (2016) Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels. In: MATEC Web of Conferences: The 3rd International Conference on Mechanical Engineering Research (ICMER 2015), 18-19 August 2015 , Zenith Hotel, Kuantan, Pahang, Malaysia. pp. 1-6., 74 (00011). ISSN 2261-236X http://dx.doi.org/10.1051/matecconf/20167400011
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery N. T., Rao A. N., Oumer Ummu Kulthum, Jamaludin A. Y., Adam Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
description	Supercritical carbon dioxide (CO2) has special thermal properties with better heat transfer and flow characteristics. Due to this reason, supercritical CO2 is being used recently in air-condition and refrigeration systems to replace non environmental friendly refrigerants. Even though many researches have been done, there are not many literatures for heat transfer and flow characteristics of supercritical CO2. Therefore, the main purpose of this study is to develop flow and heat transfer CFD models on two different phases; vapour and supercritical of CO2 to investigate the heat transfer characteristics and pressure drop in microchannels. CO2 is considered to be in different phases with different flow pressures but at same temperature. For the simulation, the CO2 flow was assumed to be turbulent, non-isothermal and Newtonian. The numerical results for both phases are compared. From the numerical analysis, for both vapour and supercritical phases, the heat energy from CO2 gas transferred to water to attain thermal equilibrium. The temperature of CO2 at vapour phase decreased 1.78% compared to supercritical phase, which decreased for 0.56% from the inlet temperature. There was a drastic increase of 72% for average Nu when the phase changed from vapour to supercritical. The average Nu decreased rapidly about 41% after total pressure of 9.0MPa. Pressure drop (P) increased together with Reynolds number (Re) for vapour and supercritical phases. When the phase changed from vapour to supercritical,P was increased about 26%. The results obtained from this study can provide information for further investigations on supercritical CO2.
format	Conference or Workshop Item
author	N. T., Rao A. N., Oumer Ummu Kulthum, Jamaludin A. Y., Adam
author_facet	N. T., Rao A. N., Oumer Ummu Kulthum, Jamaludin A. Y., Adam
author_sort	N. T., Rao
title	Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
title_short	Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
title_full	Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
title_fullStr	Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
title_full_unstemmed	Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels
title_sort	numerical analysis of flow and heat transfer characteristics of co2 at vapour and supercritical phases in micro-channels
publisher	EDP Sciences
publishDate	2016
url	http://umpir.ump.edu.my/id/eprint/10212/ http://umpir.ump.edu.my/id/eprint/10212/ http://umpir.ump.edu.my/id/eprint/10212/1/Numerical%20Analysis%20of%20Flow%20and%20Heat%20Transfer%20Characteristics%20of%20CO2%20at%20Vapour%20and%20Supercritical%20Phases%20in%20Micro-Channels..pdf http://umpir.ump.edu.my/id/eprint/10212/7/fkm-2016-rao-Numerical%20Analysis%20of%20Flow%20and%20Heat.pdf
first_indexed	2023-09-18T22:09:35Z
last_indexed	2023-09-18T22:09:35Z
_version_	1777414937256132608

Numerical Analysis of Flow and Heat Transfer Characteristics of CO2 at Vapour and Supercritical Phases in Micro-Channels

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