Heat transfer and pressure drop results for one- and two-row arrays of finned tubes

Sparrow, E. M.; Samie, Farzad

doi:10.1016/0017-9310(85)90043-2

Cited by 40 publications

(21 citation statements)

References 2 publications

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“…When the transverse pitch of the tube was changed, the existence of a clear influence on the pressure drop at the sideair was observed, while there was a lack of significant change in the heat transfer performance [12]. For the staggered configuration, the heat transfer coefficient is bigger for the nearer transverse pitch [12,13]. It would appear that the air velocity at the smallest channel between the fins becomes highest when the transverse pitch decreases and this impact leads to bigger values of the pressure drop and coefficient of heat transfer.…”

Section: Introductionmentioning

confidence: 95%

Effect of tube spacing, fin density and Reynolds number on overall heat transfer rate for in-line configuration

Tahseen¹,

Rahman²,

Ishak

2015

Int. J. Automot. Mech. Eng.

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This paper presents variation of overall dimensionless heat transfer rate against dimensionless tubes spacing, fins density, Reynolds number for in-line configuration. Influence of Reynolds number on the predicted and experimental results of dimensionless pumping power minimization for with respect to the dimensionless fins density for several tube-to-tube spacing also investigated. The experiments were conducted at a flat tube in the flow direction, and Reynolds number based on the hydraulic diameter (ReDh) was considered. The dimensionless overall heat transfer rate is always increases with an increase of the Reynolds number. The dimensionless fins spacing effect on the dimensionless overall heat transfer rate increase is noticeable at high Reynolds numbers. The dimensionless pumping power increases with increasing response Reynolds numbers for dimensionless tubes spacing and dimensionless fins density. The dimensionless pumping power decreased with increase of dimensionless fin density.

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Section: Introductionmentioning

confidence: 95%

Effect of tube spacing, fin density and Reynolds number on overall heat transfer rate for in-line configuration

Tahseen¹,

Rahman²,

Ishak

2015

Int. J. Automot. Mech. Eng.

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“…Their estimate indicated that the pin-fin surface coefficients were approximately double the end wall values.. Simoneau and Vanfossen [18] also studied the heat dissipation from a staggered array of cylindrical pin fins in a rectangular channel. Matsumoto et al [19] studied the end wall heat transfer in the presence of inline and staggered adiabatic circular pin fins. A review of staggered array pin fin heat transfer for turbine cooling applications was presented by Armstrong and Winstanley [20].…”

Section: Literature Surveymentioning

confidence: 99%

A Review Paper on CFD Simulation of Square Threaded & Helical Twisted Pin Fin Arrays in a Rectangular Channel to Enhance Heat Transfer

2015

IJSR

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“…In this experiment, the cylinders were mounted vertically and, since heat was supplied using electrical heaters, heat transfer can be analysed on a per-row basis. The experiment results of two-row staggered bundle reported by Sparrow and Samie (1985) [68] are the source of literature comparison to verify finned bundle data generated from measurements in our study. [68] (black-filled data points, only data fall into our range of Re are shown)…”

Section: Finned Tube Benchmarking and Comparison With Literature Resultsmentioning

confidence: 99%

“…Open literature offers limited source of experiment data on tubular heat exchanger bundles with small number of rows. Sparrow and Samie (1985) [68] reported their work on oneand two-row bundles of annular finned cylinders both for aligned and staggered configurations. For one row array, they studied the effect of transversal pitch on thermo-hydraulic results using 6 different settings forX T .…”

Section: Finned Tube Benchmarking and Comparison With Literature Resultsmentioning

confidence: 99%

“…Heat transfer results from Sparrow and Samie (1985) [68] were reported on individual row for single row, as well as first row, and second row of two-row bundle. For staggered configuration, they found that N u of the first row in a two-row bundle wasn't sensitive to longitudinal pitch and its values across the range of the Reynolds number under test were essentially the same to those of the single row.…”

Section: Heat Transfermentioning

confidence: 99%

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Improving the performance of air-cooled condensers by using metal foams

Chumpia¹

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This research investigates the implementation of porous metals particularly aluminum foam as an enhanced surface to improve heat transfer on the air side of air-cooled, tubular heat exchangers. The target application for these heat exchangers is the condensers for geothermal power plants in remote locations of Australia where water for wet cooling is scarce. Traditional practices for liquid-to-air or vapor-to-air heat exchangers rely predominantly on finned surfaces to enhance heat transfer rate. Heat transfer enhancement in these designs is achieved via an increased surface area of simple geometries. Recent advancement in manufacturing and availability of porous materials make them possible to be utilized in thermal exchange equipment to improve efficiency and compactness.This work describes heat exchanger tubes based on circular cylinders with aluminum foam covering on the outer surface. Thermo-hydraulic performances are evaluated experimentally in a cross-flow using low-speed wind tunnel. The tests are performed on single cylinders, single row arrays, and multi-row tube bundles in both aligned and staggered configurations subjected to airflow of 0.5 to 5.0 m/s. This range of air velocities is chosen as it encompasses vertical flow regimes occur inside typical cooling towers. The effects of foam layer thickness, transversal and longitudinal tube pitches, foam-to-tube bonding methods, and tube bank patterns, are collectively investigated. The results are compared to baseline data obtained from conventional, annular finned tubes and tube bundles tested under the same conditions.The overall conclusions are drawn on heat transfer and pressure drop as two main comparison parameters. Experimental results on these parameters confirm the trend of numerical findings of a previous in-house study, although with varying degrees of differences on their magnitude. In all finned-versus foam-surface comparisons, under the same testing conditions and using specimens of similar dimensions, the latter shows convincing benefits on heat transfer/pressure drop ratios over the full range of chosen airflows. Within this range, the maximum relative advantage of the foam-covered heat exchangers over the finned type is observed at the midrange of airflow between 2.0 and 2.5 m/s. This result is both desirable and opportune because these designated airflows coincide with the top end velocity found inside most natural-draft cooling towers. Beyond this range of airflow up to 5.0 m/s, a typical range at the lower end of induced-or forced-draft cooling towers, the relative merit of heat transfer/pressure drop is rapidly degraded. However, in a situation where the increased heat transfer is under demand and compactness is not a critical factor, the pressure drop can be reduced satisfactorily by choosing a suitable transversal pitch within the tube bundle. Under this reduced blockage condition, metal foam heat exchanger bundles tend to behave as a group of an individual tube; therefore, retain higher relative benefit in terms of the sum...

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Heat transfer and pressure drop results for one- and two-row arrays of finned tubes

Cited by 40 publications

References 2 publications

Effect of tube spacing, fin density and Reynolds number on overall heat transfer rate for in-line configuration

Effect of tube spacing, fin density and Reynolds number on overall heat transfer rate for in-line configuration

A Review Paper on CFD Simulation of Square Threaded & Helical Twisted Pin Fin Arrays in a Rectangular Channel to Enhance Heat Transfer

Improving the performance of air-cooled condensers by using metal foams

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