A numerical investigation of heat transfer enhancement in offset strip fin heat exchangers in self‐sustained oscillatory flows

Saidi, Arash; Sundén, Bengt

doi:10.1108/eum0000000005984

Cited by 21 publications

(7 citation statements)

References 19 publications

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“…Saidi et al [19] noted that, due to the nature of the compact heat exchangers, in most of the studies, the flow regime is at lower Re range; in addition, in some rare applications, some researchers examine the flow at higher Re range in order to see the response at the turbulent. The flow regime at the intermediate Re range is not very common and there are unrevealed parts for this flow type.…”

Section: Numerical Studies For Influence On Flow and Heat Transfermentioning

confidence: 99%

Comprehensive Study of Compact Heat Exchangers with Offset Strip Fin

Erbay¹,

Öztürk²,

Doɪan³

2017

Heat Exchangers - Advanced Features and Applications

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This chapter is aimed to address the performance of compact heat exchangers with offset strip fin, which have been studied by the researchers in detail for decades. The history and basic features of offset strip fins (OSF) are described first to introduce the fin geometry. Then, the effect of the fin geometry on the performance of the offset strip fin is given from experimental and numerical aspects, respectively. Flow streams evolution under varying offset strip geometries is summarized in order to demonstrate the physical impact on the flow. The thermohydraulic features of the flow in the offset strip fin are investigated by considering the Colburn j-factor and friction (f) factors in diverse flow regimes. Furthermore the criteria, flow area goodness factor j/f, the ratio j/f 1/3 and thermohydraulic performance factor JF, derived from the mentioned dimensionless factors, are also used as a scale of the performance of the structure and reported in the chapter.

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Section: Numerical Studies For Influence On Flow and Heat Transfermentioning

confidence: 99%

Comprehensive Study of Compact Heat Exchangers with Offset Strip Fin

Erbay¹,

Öztürk²,

Doɪan³

2017

Heat Exchangers - Advanced Features and Applications

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“…A numerical investigation of heat transfer enhancement in offset strip fin heat exchangers in self-sustained oscillatory flows by Arash Saidi [73] et al, in this study an analysis based on the two dimensional governing equations of the fluid flow and heat transfer with the use of computational fluid dynamics methods in a Unsteady calculations was carried out. The obtained results were compared with previous numerical and experimental results.…”

Section: A Pressure Drop and Heat Transfer Characteristicsmentioning

confidence: 99%

A Review on Plate Fin Heat Exchanger

sh¹,

Raj²,

Thirumalai³

2017

IJME

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This review paper presents the advances in plate fin heat exchangers. A considerable amount of experimental as well as numerical and computational research has been carried out on the enhancement of heat transfer and pressure drop characteristics and other parameters. In this review study, a brief survey of the relevant literature is presented to indicate the extent of work already reported in open literature pertaining to the enhancement of heat transfer by introducing protrusions mounted on the heat transfer surfaces. This section deals with the overview of the past work involving the use of various plate fin heat exchangers on different surface geometries i.e. rectangular channel, fin-tube heat exchangers etc.

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“…For the ranges of parameters studied, the addition of low-conductivity protrusions leads to a decrease in the average heat transfer coefficient, as compared to that for the smooth surface, in the 0-7% range for the largest channel aspect ratio and in the 18-43% for the smallest channel aspect ratio. Saidi and Sundén [172] have conducted a numerical analysis of the instantaneous flow and heat transfer has been carried out for offset strip fin geometries in selfsustained oscillatory flow. The analysis is based on the twodimensional solution of the governing equations of the fluid flow and heat transfer with the aid of appropriate computational fluid dynamics methods.…”

Section: Models For Heat Transfer and Friction Factor Correlationsmentioning

confidence: 99%

Recent Advances in Heat Transfer Enhancements: A Review Report

Siddique

Khaled

Abdulhafiz

et al. 2010

International Journal of Chemical Engineering

109

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Different heat transfer enhancers are reviewed. They are (a) fins and microfins, (b) porous media, (c) large particles suspensions, (d) nanofluids, (e) phase-change devices, (f) flexible seals, (g) flexible complex seals, (h) vortex generators, (i) protrusions, and (j) ultra high thermal conductivity composite materials. Most of heat transfer augmentation methods presented in the literature that assists fins and microfins in enhancing heat transfer are reviewed. Among these are using joint-fins, fin roots, fin networks, biconvections, permeable fins, porous fins, capsulated liquid metal fins, and helical microfins. It is found that not much agreement exists between works of the different authors regarding single phase heat transfer augmented with microfins. However, too many works having sufficient agreements have been done in the case of two phase heat transfer augmented with microfins. With respect to nanofluids, there are still many conflicts among the published works about both heat transfer enhancement levels and the corresponding mechanisms of augmentations. The reasons beyond these conflicts are reviewed. In addition, this paper describes flow and heat transfer in porous media as a well-modeled passive enhancement method. It is found that there are very few works which dealt with heat transfer enhancements using systems supported with flexible/flexible-complex seals. Eventually, many recent works related to passive augmentations of heat transfer using vortex generators, protrusions, and ultra high thermal conductivity composite material are reviewed. Finally, theoretical enhancement factors along with many heat transfer correlations are presented in this paper for each enhancer.

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A numerical investigation of heat transfer enhancement in offset strip fin heat exchangers in self‐sustained oscillatory flows

Cited by 21 publications

References 19 publications

Comprehensive Study of Compact Heat Exchangers with Offset Strip Fin

Comprehensive Study of Compact Heat Exchangers with Offset Strip Fin

A Review on Plate Fin Heat Exchanger

Recent Advances in Heat Transfer Enhancements: A Review Report

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