Investigation of turbulent heat transfer and fluid flow in longitudinal rectangular-fin arrays of different geometries and shrouded fin array

El‐Sayed, Saad A.; Mohamed, Shamloul M; Abdel-Latif, A.M.E.; Abouda, Abdel-hamid E

doi:10.1016/s0894-1777(02)00159-0

Cited by 75 publications

(35 citation statements)

References 7 publications

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“…Due to lack of experimental results regarding plain perforated fins in turbulent flow, the plain fin in turbulent flow model was used to compare the results of this study with the results achieved in the experimental study of El-Sayed et al [30]. In this regard, fluctuations of average Nusselt number relative to Reynolds number were compared in both studies.…”

Section: Validationmentioning

confidence: 99%

“…In this regard, fluctuations of average Nusselt number relative to Reynolds number were compared in both studies. In the experimental study of El-Sayed et al [30], an array of rectangular parallel fins were placed in different direction, and the results were compared with each other. The best result was achieved under the parallel flow condition.…”

Section: Validationmentioning

confidence: 99%

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Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Shahdad

Fazelpour

2018

Int J Energy Environ Eng

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This paper investigates the flow field and turbulent flow heat transfer around an array of plain and perforated fin using Fluent software within the range of 20,000-50,000 Reynolds. Regarding the turbulent flow, the k-ε RNG turbulence model was implemented, and SIMPLE algorithm was used for solving the equations of three-dimensional, steady, and incompressible flow. In the simulation process, air was considered as the working fluid with consistent physical properties. The results revealed that perforated fins increase the heat transfer coefficient as well as Nusselt number. The highest heat transfer coefficient and Nusselt number was achieved for perforated fins with two square holes. Moreover, it was concluded that increase of Reynolds number notably increases the heat transfer coefficient and Nusselt number. The total drag force imposed to plain fins was higher than the force imposed to perforated fins. As a result, by changing plain fins into perforated fins, the pressure decreases due to passage of the flow through the pins, and accordingly, the total drag force imposed to the fins decreases. Finally, it was revealed that attaching some pins on the plain fins along the passing flow will decrease the pressure, while notably increase the heat transfer. Furthermore, it can reduce the fins' weight and price.

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Section: Validationmentioning

confidence: 99%

Section: Validationmentioning

confidence: 99%

Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Shahdad

Fazelpour

2018

Int J Energy Environ Eng

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“…(1)(2)(3)(4)(5) Unfortunately, the cooling effects of heat sinks without fans are limited. Forced convection is another choice.…”

Section: Introductionmentioning

confidence: 99%

Heat Flow Field Analysis of the Effects of Vertical Piezoelectric Fan Placement on Heat Convection in Pin-Fin Heat Sink

2017

Sensors and Materials

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Keywords: electronic cooling, computational fluid dynamics, horizontal piezoelectric fan, heat sink Piezoelectric fans make use of the inverse piezoelectric effect to actuate the rotation of blades. These fans have the advantages of small size, low power consumption, and low noise output. In this study, we used the commercial computational fluid dynamics (CFD) software ANSYS CFD/ Fluent to simulate a transient flow field in order to explore the impact of each column on the heat flow of a rectangular-channel piezoelectric fan installed inside each columnar radiator. The aim of this study was to find the best position for the piezoelectric fan cooling radiator. In the numerical simulation, the pressure radiator fan blade tip-to-tip distance (L g ), height of the piezoelectric fan center from the flow channel plate (H w ), fin row (n), radiator fin width (W f ), and the fin gap (G) were used for the vertical piezoelectric fan to obtain the Niu Saier number (N u ) and thermal resistance (R th ). Cyclical swings of the piezoelectric fan impede the uninterrupted flow of impact energy transfer on the boundary layer. At the tip of the blade actuation direction, the fluid reciprocating stroke, that is, the direction of the flow field, was pulled, and the front tip of the blade generated a vortex forming an entrained flow, but the hot and cold air were effectively mixed. The results showed that when the height of the center of the piezoelectric fan in relation to the flow channel plate was increased, the dissipation performance decreased comparatively. Furthermore, when a pressure fan was placed in front of the radiator, the height from the base center to the flow channel of the piezoelectric fan was reduced.

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“…The issue about the heat transfer characteristics of finned heat sinks without [1][2][3][4][5][6] or with bypass effect [7][8][9][10][11][12] attracts wide attention continuously. This work is to discuss putting the pin-fin heat-sink array into a rectangular channel in in-line arrangement with laminar side-bypass effect.…”

Section: Introductionmentioning

confidence: 99%

Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

Jeng

Tzeng

2015

Applied Sciences

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This work used a porous approach model to numerically investigate the fluid flow and heat transfer characteristics of the pin-fin heat-sink array in a rectangular channel with in-line arrangement. The air flow through the channel was laminar. The pin-fin heat sinks with various porosities and pin-fin numbers were employed. The relative center-to-center longitudinal and transverse distances between adjacent heat sinks were changed. The results indicate that the Nusselt number of various heat-sink arrays increased with decreasing the relative center-to-center transverse distance, but not varied with the relative center-to-center longitudinal distance. For the typical pin-fin heat-sink arrays, the Nusselt number changed slightly for the heat sinks with 0.358-0.556 porosity, but increased by 11.7%-24.8% when the porosity increased from 0.556 to 0.750, and then dropped obviously when the porosity exceeded 0.750. Increasing the number of pin fins continuously could increase Nusselt number. However, when the number of pin fins was large, the Nusselt number increased with the number of pin fins slowly. The present numerical simulation has been validated by the typical experiment. Finally, a semi-empirical correlation of Nusselt number for each heat sink in the heat-sink array was proposed.

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Investigation of turbulent heat transfer and fluid flow in longitudinal rectangular-fin arrays of different geometries and shrouded fin array

Cited by 75 publications

References 7 publications

Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Numerical analysis of the surface and geometry of plate fin heat exchangers for increasing heat transfer rate

Heat Flow Field Analysis of the Effects of Vertical Piezoelectric Fan Placement on Heat Convection in Pin-Fin Heat Sink

Numerical Simulation of Laminar Forced Convection of Pin-Fin Heat-Sink Array in a Channel by Using Porous Approach

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