Abstract
Swirl/vortex fl ow generator is an important form of passive augmentation techniques consist of a variety of tube inserts, geometrically varied fl ow arrangements and duct geometry modifi cations that produce fl ows. Twisted-tape is one of the most important members of this form which used extensively in different type heat exchangers. This paper presents a research on heat transfer enhancement and friction factor characteristics in a circular tube using CFD simulation. Plain twisted tape inserts with twist ratios (y = 2.93, 3.91) and slant baffl ed twisted tape inserts with baffl e angle 30° and twist ratio (y = 2.93) have been used for the simulation. The results obtained by simulation matched with the literature correlations for plain tube with the discrepancy of less than ±8% for Nusselt number and ±6.25% for friction factor. The results have also revealed that the heat transfer in term of the Nusselt number enhanced with increases of Reynolds number, decreases of twist ratio. Among the various twist ratios, the slant baffl ed twisted tape with twist ratio of y = 2.93 has offered a maximum heat transfer enhancement with signifi cant friction factor.
Highlights
The performance of conventional heat exchanger can be substantially improved by a number of enhancement techniques
Pathipakka and Sivashanmugam (2010) proposed CFD simulation of heat transfer and friction factor characteristics of the circular tube fitted with a right-left helical twist insert with 100 mm spacer based on experimental work
This paper is to present numerical study on the heat transfer rate and friction factor characteristics in a round tube fitted with slant baffled twisted tape (SBT) insert based on an experimental data from Pathipakka and Sivashanmugam (2010)
Summary
The performance of conventional heat exchanger can be substantially improved by a number of enhancement techniques. Pathipakka and Sivashanmugam (2010) proposed CFD simulation of heat transfer and friction factor characteristics of the circular tube fitted with a right-left helical twist insert with 100 mm spacer based on experimental work. Salman et al (2013) reports the application of a mathematical model of the heat transfer enhancement and friction factor characteristics of water in constant heatfluxed tube fitted with classical and elliptical cut twisted tape inserts using FLUENT version 6.3.26. This paper is to present numerical study on the heat transfer rate and friction factor characteristics in a round tube fitted with slant baffled twisted tape (SBT) insert based on an experimental data from Pathipakka and Sivashanmugam (2010). The longer term objective of this paper is to reveal that the insert configuration can play an important role on heat augmentation
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