Heat Transfer Characteristics of Square Micro Pin Fins under Natural Convection

Matsumoto, Naoko; Tomimura, Toshio; Koito, Yasushi

doi:10.4236/jectc.2014.43007

Cited by 9 publications

(3 citation statements)

References 13 publications

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“…They noticed that the presence of pin-fins enhanced heat transfer by 10%. Different fin shapes were investigated by Hirasawa et al [9], as well as Matsumoto et al [10] and by Casano et al [11]. Later, Ahmadian-Elmi et al [12] continued investigating the effectiveness of pin-fins in heat extraction.…”

Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Performance of Pin-Fins in Wavy and Straight Configurations

Saghir

Rahman

2022

Micromachines

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Pin-fins configurations have been investigated recently for different engineering applications and, in particular, for a cooling turbine. In the present study, we investigated the performance of three different pin-fins configurations: pin-fins forming a wavy mini-channel, pin-fins forming a straight mini-channel, and a mini-channel without pin-fins considering water as the working fluid. The full Navier–Stokes equations and the energy equation are solved numerically using the finite element technique. Different flow rates are studied, represented by the Reynolds number in the laminar flow regime. The thermo-hydraulic performance of the three configurations is determined by examining the Nusselt number, the pressure drop, and the performance evaluation criterion. Results revealed that pin-fins forming a wavy mini-channel exhibited the highest Nusselt number, the lowest pressure drop, and the highest performance evaluation criterion. This finding is valid for any Reynolds number under investigation.

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Section: Introductionmentioning

confidence: 99%

Thermo-Hydraulic Performance of Pin-Fins in Wavy and Straight Configurations

Saghir

Rahman

2022

Micromachines

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“…A theoretical model was established to determine the effect of different parameters such as the heat sink void fraction, aspect ratio and longitudinal and transversal fin pitch on the thermal performance of a heat sink. Matsumoto et al [17] carried out both a numerical and experimental investigation to study natural convection in five kinds of pin fin heat sink. They have analyzed the effect of the fins number and the geometric parameters on the thermal efficiency.…”

Section: Introductionmentioning

confidence: 99%

Elliptical Pin Fin Heat Sink: Passive Cooling Control

Bakhti¹,

Si‐Ameur²

2021

IJHT

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The aim of this study is to examine by means of three-dimensional numerical simulations the thermal-fluid features in elliptical pin fin heat sink. The passive heat transfer enhancement technique is used to comprehend and control the cooling process. This passive methodology is based on pin fins arrangement, hydrodynamic and geometrical parameters. The present numerical results are confronted with experimental measurements in open literature which used one-dimensional model to explore the thermal field. A good agreement was found especially around the optimal fins dimensions. A parametric study has been carried out to deeply analyse the three-dimensional thermal-fluid fields of the heat sink for various key parameters range such the Reynolds number (Re = 50–250) and the aspect ratio (γ=H/d=5.1-9.18). Some new observations and results are obtained thanks to numerical simulations as tool of investigation. It is shown that the fins circumferential temperature is almost uniform. Furthermore, a better cooling is obtained when the Reynolds number increases mainly when the inlet velocity u0> 0.3m/s. The most suitable value of the aspect ratio is attained for γ=8.16, which ensure an optimal cooling process of the pins. A new global Nusselt number correlation was developed for engineering applications.

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“…Similarly, the thermal performance of heat sinks with a minimum thickness of 200 µm and a maximum height of 0.8 mm have been examined, while considering the orientation of the heat sink with respect to the gravitational field [51]. Heat transfer of square micro pin fin with the smallest dimension of 0.4 mm under natural convection has been examined [52]. The work mentioned above do not fully exploit the micro-scale effects, which are observed at dimensions smaller than a 100 µm.…”

Section: Introductionmentioning

confidence: 99%

Thermoelectric System Modeling and Design

Gamarachchi¹

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allowing me to do research at the Advanced Energy Lab, while providing me great insight in to my research. I would like to thank my lab colleagues Joey Richardson, Nick Kempf and Tony Varghese, without whom this work would have been difficult to complete. I would also like to thank my former lab colleague Luke Schoensee for his help in this work. I would also like to thank the committee members Dr. John Gardner and Dr. Inanc Senocak. Finally, I would like to acknowledge my parents Asoka and Bandula, for all their support throughout my life. vi ABSTRACT Thermoelectric generators (TEGs) convert heat to electricity by way of the Seebeck effect. TEGs have no moving parts and are environmentally friendly and can be implemented with systems to recover waste heat. This work examines complete thermoelectric systems, which include the (TEG) and heat exchangers or heat sinks attached to the hot and cold sides of the TEG to maintain the required temperature difference across the TEG. A 1-D steady state model is developed to predict the performance of a TEG given the required temperatures and device dimensions. The model is first validated using a 3-D model and then is used to examine methods to improve the TEG performance. A numerical model is developed to predict the thermal performance of heat exchangers to be used in combination with the TEG model. The combined thermoelectric generatorheat exchanger model, is compared with a 3-D model and then used to predict the performance of a TEGheat exchanger system used to recover waste heat from a diesel engine. Next natural convection heat sinks are modeled and studied to be implemented with the TEG. A model is developed to predict the performance of a system applied for power harvesting in a nuclear power plant. The model is also used to design a system to recover waste heat from the human body. Finally, a novel natural convection heat sink is suggested, where microwires act as the extended surface for the heat sink. The microwire heat sink is modeled accounting for the relevant thermal physics. The microwire heat sink is used in combination with the TEG model to predict the performance of a system used to recover waste body heat. vii TABLE OF CONTENTS

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Heat Transfer Characteristics of Square Micro Pin Fins under Natural Convection

Cited by 9 publications

References 13 publications

Thermo-Hydraulic Performance of Pin-Fins in Wavy and Straight Configurations

Thermo-Hydraulic Performance of Pin-Fins in Wavy and Straight Configurations

Elliptical Pin Fin Heat Sink: Passive Cooling Control

Thermoelectric System Modeling and Design

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