Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts

Nanofluids have gained extensive attention due to their role in improving the efficiency of thermal systems. The present study reports a further enhancement in heat transfer coefficients in combination with structural modifications of flow systems namely, the addition of tape inserts. Experiments ar...

Full description

Bibliographic Details
Main Authors:	Azmi, W. H., Sharma, K. V., Sarma, P. K., R., Mamat, Shahrani, Anuar
Format:	Article
Language:	English
Published:	Elsevier 2014
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/7690/ http://umpir.ump.edu.my/id/eprint/7690/ http://umpir.ump.edu.my/id/eprint/7690/1/Comparison%20of%20Convective%20Heat%20Transfer%20Coefficient%20and%20Friction%20Factor%20of%20TiO2%20Nanofluid%20flow%20in%20a%20tube%20with%20Twisted%20Tape%20Inserts.pdf

id	ump-7690
recordtype	eprints
spelling	ump-76902018-01-23T07:17:17Z http://umpir.ump.edu.my/id/eprint/7690/ Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts Azmi, W. H. Sharma, K. V. Sarma, P. K. R., Mamat Shahrani, Anuar TJ Mechanical engineering and machinery Nanofluids have gained extensive attention due to their role in improving the efficiency of thermal systems. The present study reports a further enhancement in heat transfer coefficients in combination with structural modifications of flow systems namely, the addition of tape inserts. Experiments are undertaken to determine heat transfer coefficients and friction factor of TiO2/water nanofluid up to 3.0% volume concentration at an average temperature of 30 C. The investigations are undertaken in the Reynolds number range of 8000-30,000 for flow in tubes and with tapes of different twist ratios. A significant enhancement of 23.2% in the heat transfer coefficients is observed at 1.0% concentration for flow in a tube. With the use of twisted tapes, the heat transfer coefficient increased with decrease in twist ratio for water and nanofluid. The heat transfer coefficient and friction factor are respectively 81.1% and 1.5 times greater at Re ¼ 23,558 with 1.0% concentration and twist ratio of 5, compared to values with flow of water in a tube. An increase in the nanofluid concentration to 3.0% decreased heat transfer coefficients to values lower than water for flow in a tube and with tape inserts. A thermal system with tape insert of twist ratio 15 and 1.0% TiO2 concentration gives maximum advantage ratio, if pressure drop is considered along with enhancement in heat transfer coefficient. Elsevier 2014-04-12 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/7690/1/Comparison%20of%20Convective%20Heat%20Transfer%20Coefficient%20and%20Friction%20Factor%20of%20TiO2%20Nanofluid%20flow%20in%20a%20tube%20with%20Twisted%20Tape%20Inserts.pdf Azmi, W. H. and Sharma, K. V. and Sarma, P. K. and R., Mamat and Shahrani, Anuar (2014) Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts. International Journal of Thermal Sciences, 81. pp. 84-93. ISSN 1290-0729 http://dx.doi.org/10.1016/j.ijthermalsci.2014.03.002
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 Azmi, W. H. Sharma, K. V. Sarma, P. K. R., Mamat Shahrani, Anuar Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
description	Nanofluids have gained extensive attention due to their role in improving the efficiency of thermal systems. The present study reports a further enhancement in heat transfer coefficients in combination with structural modifications of flow systems namely, the addition of tape inserts. Experiments are undertaken to determine heat transfer coefficients and friction factor of TiO2/water nanofluid up to 3.0% volume concentration at an average temperature of 30 C. The investigations are undertaken in the Reynolds number range of 8000-30,000 for flow in tubes and with tapes of different twist ratios. A significant enhancement of 23.2% in the heat transfer coefficients is observed at 1.0% concentration for flow in a tube. With the use of twisted tapes, the heat transfer coefficient increased with decrease in twist ratio for water and nanofluid. The heat transfer coefficient and friction factor are respectively 81.1% and 1.5 times greater at Re ¼ 23,558 with 1.0% concentration and twist ratio of 5, compared to values with flow of water in a tube. An increase in the nanofluid concentration to 3.0% decreased heat transfer coefficients to values lower than water for flow in a tube and with tape inserts. A thermal system with tape insert of twist ratio 15 and 1.0% TiO2 concentration gives maximum advantage ratio, if pressure drop is considered along with enhancement in heat transfer coefficient.
format	Article
author	Azmi, W. H. Sharma, K. V. Sarma, P. K. R., Mamat Shahrani, Anuar
author_facet	Azmi, W. H. Sharma, K. V. Sarma, P. K. R., Mamat Shahrani, Anuar
author_sort	Azmi, W. H.
title	Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
title_short	Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
title_full	Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
title_fullStr	Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
title_full_unstemmed	Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts
title_sort	comparison of convective heat transfer coefficient and friction factor of tio2 nanofluid flow in a tube with twisted tape inserts
publisher	Elsevier
publishDate	2014
url	http://umpir.ump.edu.my/id/eprint/7690/ http://umpir.ump.edu.my/id/eprint/7690/ http://umpir.ump.edu.my/id/eprint/7690/1/Comparison%20of%20Convective%20Heat%20Transfer%20Coefficient%20and%20Friction%20Factor%20of%20TiO2%20Nanofluid%20flow%20in%20a%20tube%20with%20Twisted%20Tape%20Inserts.pdf
first_indexed	2023-09-18T22:04:33Z
last_indexed	2023-09-18T22:04:33Z
_version_	1777414621222666240

Comparison of Convective Heat Transfer Coefficient and Friction Factor of TiO2 Nanofluid flow in a tube with Twisted Tape Inserts

Similar Items