Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts

The present work shows the results obtained from experimental investigations of the augmentation of turbulent flow heat transfer in a horizontal tube by means of varying width twisted tape inserts, with air as the working fluid. In order to reduce excessive pressure drops associated with full-width...

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Main Authors:	Sarad, S. Naga, Raju, A.V. Sita Rama, Radha, K. Kalyani, Sunder, L. Syam
Format:	Article
Language:	English
Published:	Universiti Malaysia Pahang 2012
Subjects:	TJ Mechanical engineering and machinery
Online Access:	http://umpir.ump.edu.my/id/eprint/3505/ http://umpir.ump.edu.my/id/eprint/3505/ http://umpir.ump.edu.my/id/eprint/3505/1/11_Naga_Sarada_et_al.pdf

id	ump-3505
recordtype	eprints
spelling	ump-35052015-03-03T08:01:36Z http://umpir.ump.edu.my/id/eprint/3505/ Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts Sarad, S. Naga Raju, A.V. Sita Rama Radha, K. Kalyani Sunder, L. Syam TJ Mechanical engineering and machinery The present work shows the results obtained from experimental investigations of the augmentation of turbulent flow heat transfer in a horizontal tube by means of varying width twisted tape inserts, with air as the working fluid. In order to reduce excessive pressure drops associated with full-width twisted tape inserts, with a lower corresponding reduction in heat transfer coefficients, reduced-width twisted tapes of widths ranging from 10 mm to 22 mm are used, which are lower than the internal diameter of the tube of 27.5 mm. Experiments were carried out for plain tubes with/without twisted tape inserts at a constant wall heat flux and different mass flow rates. The twisted tapes are of three different twist ratios (3, 4 and 5), each with five different widths (26 (full-width), 22, 18, 14 and 10 mm). The Reynolds number varied from 6000 to 13500. Both the heat transfer coefficient and pressure drop are calculated, and the results are compared with those of a plain tube. It is observed that with the inclusion of twisted tape inserts there is a significant increase in the heat transfer coefficients. Correlations are developed for friction factors and Nusselt numbers for a fully-developed turbulent swirl flow, which are applicable to full-width as well as reduced-width twisted tapes, using a modified twist ratio as the pitch to width ratio of the tape. Universiti Malaysia Pahang 2012 Article PeerReviewed application/pdf en http://umpir.ump.edu.my/id/eprint/3505/1/11_Naga_Sarada_et_al.pdf Sarad, S. Naga and Raju, A.V. Sita Rama and Radha, K. Kalyani and Sunder, L. Syam (2012) Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts. International Journal of Automotive and Mechanical Engineering (IJAME), 6 (Jul. pp. 797-810. ISSN 2229-8649 (Print); 2180-1606 (Online) http://ijame.ump.edu.my/images/Volume%206/11%20Naga%20Sarada%20et%20al.pdf
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 Sarad, S. Naga Raju, A.V. Sita Rama Radha, K. Kalyani Sunder, L. Syam Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
description	The present work shows the results obtained from experimental investigations of the augmentation of turbulent flow heat transfer in a horizontal tube by means of varying width twisted tape inserts, with air as the working fluid. In order to reduce excessive pressure drops associated with full-width twisted tape inserts, with a lower corresponding reduction in heat transfer coefficients, reduced-width twisted tapes of widths ranging from 10 mm to 22 mm are used, which are lower than the internal diameter of the tube of 27.5 mm. Experiments were carried out for plain tubes with/without twisted tape inserts at a constant wall heat flux and different mass flow rates. The twisted tapes are of three different twist ratios (3, 4 and 5), each with five different widths (26 (full-width), 22, 18, 14 and 10 mm). The Reynolds number varied from 6000 to 13500. Both the heat transfer coefficient and pressure drop are calculated, and the results are compared with those of a plain tube. It is observed that with the inclusion of twisted tape inserts there is a significant increase in the heat transfer coefficients. Correlations are developed for friction factors and Nusselt numbers for a fully-developed turbulent swirl flow, which are applicable to full-width as well as reduced-width twisted tapes, using a modified twist ratio as the pitch to width ratio of the tape.
format	Article
author	Sarad, S. Naga Raju, A.V. Sita Rama Radha, K. Kalyani Sunder, L. Syam
author_facet	Sarad, S. Naga Raju, A.V. Sita Rama Radha, K. Kalyani Sunder, L. Syam
author_sort	Sarad, S. Naga
title	Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
title_short	Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
title_full	Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
title_fullStr	Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
title_full_unstemmed	Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts
title_sort	augmentation of turbulent flow heat transfer in a horizontal tube with varying width twisted tape inserts
publisher	Universiti Malaysia Pahang
publishDate	2012
url	http://umpir.ump.edu.my/id/eprint/3505/ http://umpir.ump.edu.my/id/eprint/3505/ http://umpir.ump.edu.my/id/eprint/3505/1/11_Naga_Sarada_et_al.pdf
first_indexed	2023-09-18T21:57:53Z
last_indexed	2023-09-18T21:57:53Z
_version_	1777414201123274752

Augmentation of Turbulent Flow Heat Transfer in A Horizontal Tube with Varying Width Twisted Tape Inserts

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