Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures

Supercritical carbon dioxide (scCO2) has unique thermal properties with better flow and heat transfer behavior. However, the flow and heat transfer behavior of scCO2 using helical coil geometries have not fully documented yet. Therefore, the main purpose of this study is to investigate the flow and...

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Main Authors:	Rao, N. Thiwaan, Oumer, A. N., Devandran, G., M. M., Noor
Format:	Conference or Workshop Item
Language:	English
Published:	EDP Sciences 2018
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/15290/ http://umpir.ump.edu.my/id/eprint/15290/ http://umpir.ump.edu.my/id/eprint/15290/1/Investigation%20on%20Flow%20and%20Heat%20Transfer%20of%20Supercritical%20CO2%20in.pdf

id	ump-15290
recordtype	eprints
spelling	ump-152902019-01-04T00:57:09Z http://umpir.ump.edu.my/id/eprint/15290/ Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures Rao, N. Thiwaan Oumer, A. N. Devandran, G. M. M., Noor TJ Mechanical engineering and machinery Supercritical carbon dioxide (scCO2) has unique thermal properties with better flow and heat transfer behavior. However, the flow and heat transfer behavior of scCO2 using helical coil geometries have not fully documented yet. Therefore, the main purpose of this study is to investigate the flow and heat transfer characteristics of scCO2 in helical coiled tubes for heating process using computational fluid dynamics (CFD) method. For the simulation, commercial CFD software called ANSYS FLUENT is used. Helical coiled tube of inner and outer diameter 9.0 mm and 12.0 mm, respectively, with total length of 5500 mm, pitch distance of 32.0 mm and 6 turns of coils is considered. The model is intended to analyze the pressure drops, friction factor, Nusselt number, and goodness factor of scCO2. Three different inlet pressures (8.00 MPa, 9.03 MPa and 10.05 MPa) with three different uniform heat fluxes (20.5 kW/m², 50.5 kW/m² and 80.5 kW/m²) at constant inlet temperature of 27°C are considered. The numerical results are compared with experiment results from previous study to validate the developed model. The wall temperature results from the numerical analysis are in good agreement with the experimental data. From the numerical analysis, the Nusselt number increased significantly when the inlet mass flow rate and heat flux increased. Moreover, it was observed from the simulation results that an increment of average pressure drop by 900 Pa (19.57%) and average friction factor coefficient by 0.1536 (33.85%) when the pressure inlet increased from 9.03 MPa to 10.05 MPa. Hence, the results obtained from this study can provide information for further investigation of scCO2 for industrial applications. EDP Sciences 2018 Conference or Workshop Item PeerReviewed pdf en cc_by_4 http://umpir.ump.edu.my/id/eprint/15290/1/Investigation%20on%20Flow%20and%20Heat%20Transfer%20of%20Supercritical%20CO2%20in.pdf Rao, N. Thiwaan and Oumer, A. N. and Devandran, G. and M. M., Noor (2018) Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures. In: MATEC Web of Conferences: UTP-UMP-VIT Symposium on Energy Systems 2018 (SES 2018), 18-19 September 2018 , Universiti Malaysia Pahang. pp. 1-10., 225 (01018). ISSN 2261-236X https://doi.org/10.1051/matecconf/201822501018
repository_type	Digital Repository
institution_category	Local University
institution	Universiti Malaysia Pahang
building	UMP Institutional Repository
collection	Online Access
language	English
topic	TJ Mechanical engineering and machinery
spellingShingle	TJ Mechanical engineering and machinery Rao, N. Thiwaan Oumer, A. N. Devandran, G. M. M., Noor Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
description	Supercritical carbon dioxide (scCO2) has unique thermal properties with better flow and heat transfer behavior. However, the flow and heat transfer behavior of scCO2 using helical coil geometries have not fully documented yet. Therefore, the main purpose of this study is to investigate the flow and heat transfer characteristics of scCO2 in helical coiled tubes for heating process using computational fluid dynamics (CFD) method. For the simulation, commercial CFD software called ANSYS FLUENT is used. Helical coiled tube of inner and outer diameter 9.0 mm and 12.0 mm, respectively, with total length of 5500 mm, pitch distance of 32.0 mm and 6 turns of coils is considered. The model is intended to analyze the pressure drops, friction factor, Nusselt number, and goodness factor of scCO2. Three different inlet pressures (8.00 MPa, 9.03 MPa and 10.05 MPa) with three different uniform heat fluxes (20.5 kW/m², 50.5 kW/m² and 80.5 kW/m²) at constant inlet temperature of 27°C are considered. The numerical results are compared with experiment results from previous study to validate the developed model. The wall temperature results from the numerical analysis are in good agreement with the experimental data. From the numerical analysis, the Nusselt number increased significantly when the inlet mass flow rate and heat flux increased. Moreover, it was observed from the simulation results that an increment of average pressure drop by 900 Pa (19.57%) and average friction factor coefficient by 0.1536 (33.85%) when the pressure inlet increased from 9.03 MPa to 10.05 MPa. Hence, the results obtained from this study can provide information for further investigation of scCO2 for industrial applications.
format	Conference or Workshop Item
author	Rao, N. Thiwaan Oumer, A. N. Devandran, G. M. M., Noor
author_facet	Rao, N. Thiwaan Oumer, A. N. Devandran, G. M. M., Noor
author_sort	Rao, N. Thiwaan
title	Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
title_short	Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
title_full	Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
title_fullStr	Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
title_full_unstemmed	Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures
title_sort	investigation on flow and heat transfer of supercritical co2 in helical coiled tubes at various supercritical pressures
publisher	EDP Sciences
publishDate	2018
url	http://umpir.ump.edu.my/id/eprint/15290/ http://umpir.ump.edu.my/id/eprint/15290/ http://umpir.ump.edu.my/id/eprint/15290/1/Investigation%20on%20Flow%20and%20Heat%20Transfer%20of%20Supercritical%20CO2%20in.pdf
first_indexed	2023-09-18T22:19:48Z
last_indexed	2023-09-18T22:19:48Z
_version_	1777415579995471872

Investigation on Flow and Heat Transfer of Supercritical CO2 in Helical Coiled Tubes at Various Supercritical Pressures

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