Thermal-hydraulic performance optimization of inline and staggered fin-tube compact heat exchangers applying longitudinal vortex generators

Salviano, Leandro; Dezan, Daniel Jonas; Yanagihara, Jurandir Itizo

doi:10.1016/j.applthermaleng.2015.11.069

Cited by 60 publications

(10 citation statements)

References 23 publications

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“…In the case of CRW and RW VG, the LV intensity tends to be dissipated after passing VG at the position x/L = 0.4 due to the viscous effect [25], which causes a decrease in LV intensity, as can be seen from Figure 8 at a flow rate of 2 m/s. Lis the length of the plate to which VG is mounted, while x is the position of the cross-section of the inlet section.…”

Section: Longitudinal Vortex Intensitymentioning

confidence: 90%

“…Overall, the temperature distribution in the cross-section area at several locations with VG mounted is better distributed than without VG (baseline). CRW VG is distributed better than RW VG because of the distortion in the thermal boundary layer due to a strong swirling flow, which causes damage to the thermal resistance between the walls and the flow so that heat transfer increases [25]. Figure 9 shows that the hole in VG causes the LV intensity to decrease due to the formation of jet flow which results in a slight reduction in the temperature gradient [23].…”

Section: Pressure Distributionmentioning

confidence: 99%

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Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Syaiful

Hendraswari

S.U.

et al. 2021

Fluids

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Passive methods using vortex generators (VGs) to enhance heat transfer have been a concern of researchers in recent decades. This study is intended to investigate the strength of the vortex generated by VGs by trying to reduce the pressure drop in the flow. The present work also takes into account the influence of the vortex intensity on the improvement of heat transfer, which can be indicated by the low value of the synergy angle. Experiments were carried out in the current investigation to validate the results of the numerical simulations in the Reynolds number range of 3102 to 16,132. The study results indicate that the observed heat transfer coefficients from the experimental and simulation results have a similar tendency with relatively small errors. A reduction in pressure drop is observed with the use of perforated concave rectangular winglets (PCRWs) against the nonperforated ones although there was a slight decrease in heat transfer improvements.

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Section: Longitudinal Vortex Intensitymentioning

confidence: 90%

Section: Pressure Distributionmentioning

confidence: 99%

Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Syaiful

Hendraswari

S.U.

et al. 2021

Fluids

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“…The present paper deals with a situation in which heat load and mass flow rate are fixed; hence, we would focus our attention on a staggered fin array. A few other advantages of staggered arrangement over inline arrangement are demonstrated in Salviano et al (2016). Literature shows that studies with fins have been performed with and without tip insulation.…”

Section: Introductionmentioning

confidence: 99%

Thermal Performance Improvement of a Fin-Arrayed Horizontal Heat Sink Corroborating Optimal Orientation Angle

Mandal*,

Sengupta,

Rana

et al. 2020

IJITEE

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The present study deals with a simple but effective technique for improving the forced convective cooling of a horizontal heat sink with vertical pin-fin-array.The pin fins are embedded in a staggered arrangement on thebase-plate of the horizontal sink. Air, while passing through the fin-array, convects the heat conducted from the solid base-plate to the fins’ surface. The objective of this paper is to examine the role of the orientation angle (  ) on the performance of the heat sink.  is varied from  0 to  360 by rotating the horizontal sink about a vertical axis passing through the center of the sink. A detailed CFD (computational fluid dynamics) study is coordinated over a wide range of inflow Reynolds number ( Re ) to explore the possibility for obtaining an optimum orientation angle (  ) for which Nusselt number ( Nu ) would be the maximum. Results indicate that optimum angle hovers around    120 regardless of the values of Re .

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“…Wavy fins (Kays 1960;Kays and London 1984;Lotfi et al 2014;Wang et al 1999) are not a discontinuous surface, but they provide additional surface area for the same volume and can promote chaotic flow (Mohammed et al 2011;Sui et al 2010), which result in enhanced heat transfer and are preferred in some applications (Huang et al 2014a;Silva et al 2011). Recent efforts on fin enhancement are winglets, or vortex generators (Arora et al 2016;Gholami et al 2014;Huisseune et al 2013;Shah 1995, 1998;Lotfi et al 2014;Salviano et al 2016;Tiwari et al 2003) which result in induced turbulence within the boundary layer, or even its disruption, thus enhancing the thermal performance.…”

Section: Introductionmentioning

confidence: 99%

Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing

Bacellar

Aute

Huang

et al. 2017

Science and Technology for the Built Environment

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The airside thermal resistance of air-to-fluid heat exchangers dominates the overall thermal resistance. On conventional heat exchanger's, fins are required to address such challenges; but their benefits are not limitless and are bound mainly by the tube size and shape. The reduction of the tube characteristic length has favorable impact on compactness and heat transfer. Conventional tubes are typically limited to round, elliptical or flat shapes which result in particular thermal-hydraulic characteristics. The current article has three main objectives. First, discuss the importance of fins on typical air-to-fluid heat exchanger's and how they become unattractive at smaller characteristic lengths with numerical analyses to support this argument from different perspectives. Second, present a proof-of-concept design with small finless tubes and a novel shape that can outperform a microchannel heat exchanger. Third, present a comprehensive analysis with shape optimization leveraging automated computational fluid dynamics simulations and approximation assisted optimization techniques. Optimum designs can achieve more than 50% reduction in size, material, and pressure drop compared to the baseline microchannel heat exchanger. The method is validated with the experimental validation of a metal three-dimensional printed prototype of the NTHX-001. The numerical simulations agreed within less than 5% in capacity, 10% in air heat transfer coefficient, and 15% in air pressure drop.

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Thermal-hydraulic performance optimization of inline and staggered fin-tube compact heat exchangers applying longitudinal vortex generators

Cited by 60 publications

References 23 publications

Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Heat Transfer Enhancement inside Rectangular Channel by Means of Vortex Generated by Perforated Concave Rectangular Winglets

Thermal Performance Improvement of a Fin-Arrayed Horizontal Heat Sink Corroborating Optimal Orientation Angle

Design optimization and validation of high-performance heat exchangers using approximation assisted optimization and additive manufacturing

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