Further understanding of twisted tape effects as tube insert for heat transfer enhancement

Author: Abu-Khader, Mazen

Source: Heat and Mass Transfer, Volume 43, Number 2, December 2006 , pp. 123-134(12)

Publisher: Springer

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Abstract:

Tube inserts are used as heat transfer enhancement tool for both retrofit and new design of shell and tube heat exchangers. This paper discusses and reviews the characteristics and performance of twisted tapes. The theory and application are also addressed. Industrial case study was selected to illustrate the behaviour effect that the twisted tapes impose at various laminar, transition and turbulent flow regions. This effect was demonstrated by changing the inside tube diameter and twist ratio through evaluating selected exchanger design parameters such as: local heat transfer coefficient, friction factor and pressure drop. Testing the exponent powers for Re and Pr at both laminar and turbulent regions were carried out. General design considerations are outlined for the use of twisted tapes in shell and tube heat exchangers.

Keywords: Twisted tapes; Tube inserts; Heat transfer enhancement; Shell and tube heat exchangers

Document Type: Research article

DOI: http://dx.doi.org/10.1007/s00231-006-0097-7

Affiliations: 1: Email: mak@accessme.com

Publication date: 2006-12-01