Numerical investigation of the effects of geometric structure of microchannel heat sink on flow characteristics and heat transfer performance

Air jet impingement is one of the effective cooling techniques employed in micro-electronic industry. To enhance the heat transfer performance, a cooling system with air jet impingement on a finned heat sink is evaluated via the computational fluid dynamics method. A two-dimensional confined slot air impinging on a finned flat plate is modeled. The numerical model is validated by comparison of the computed Nusselt number distribution on the impingement target with published experimental results. The flow characteristics and heat transfer performance of jet impingement on both of smooth and finned heat sinks are compared. It is observed that jet impingement over finned target plate improves the cooling performance significantly. A dimensionless heat transfer enhancement factor is introduced to quantify the effect of jet flow Reynolds number on the finned surface. The effect of rectangular fin dimensions on impingement heat transfer rate is discussed in order to optimize the cooling system. Also, the computed flow and thermal fields of the air impingement system are examined to explore the physical mechanisms for heat transfer enhancement.

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Numerical Study on the Heat Transfer Performance of Non-Newtonian Fluid Flow in a Manifold Microchannel Heat Sink

ECS Meeting Abstracts ◽

10.1149/ma2016-02/36/2298 ◽

2016 ◽

Keyword(s):

Heat Transfer ◽

Fluid Flow ◽

Newtonian Fluid ◽

Heat Sink ◽

Heat Transfer Performance ◽

Numerical Study ◽

Microchannel Heat Sink ◽

Transfer Performance ◽

Manifold Microchannel

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Optimization of Flow and Heat Transfer for a New Double-Layered Microchannel Heat Sink

ASME 2019 6th International Conference on Micro/Nanoscale Heat and Mass Transfer ◽

10.1115/mnhmt2019-3967 ◽

2019 ◽

Author(s):

Huanling Liu ◽

Bin Zhang

Keyword(s):

Heat Transfer ◽

Heat Sink ◽

Heat Transfer Performance ◽

Microchannel Heat Sink ◽

Transfer Performance ◽

Temperature Uniformity ◽

Flow And Heat Transfer ◽

Fluent Simulation ◽

New Type ◽

Improved Design

Abstract In this paper, we propose a new type of DL-MCHS to improve the substrate temperature uniformity of the microchannel heat sink, and conduct the optimization of the New DL-MCHS. The heat transfer and friction characteristics of the novel DL-MCHS are studied by numerical simulation. We compare the heat transfer performance the new DL-MCHS with the traditional TDL-MCHS (the DL-MCHS with truncated top channels λ = 0.38). The results prove the effectiveness of the improved design by FLUENT simulation. When the inlet velocity is kept constant and coolant is water, the heat transfer performance of the New DL-MCHS is higher than that of TDL-MCHS leading to an increase of the temperature uniformity. In order to achieving the best overall heat transfer performance, an optimization of New DL-MCHS is performed by GA (genetic algorithm).

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Heat Transfer Enhancement in a Microchannel Heat Sink with Trapezoidal Cavities on the Side Walls

Applied Mechanics and Materials ◽

10.4028/www.scientific.net/amm.819.127 ◽

2016 ◽

Vol 819 ◽

pp. 127-131

Author(s):

Navin Raja Kuppusamy ◽

N.N.N. Ghazali ◽

Saidur Rahman ◽

M.A. Omar Awang ◽

Hussein A. Mohammed

Keyword(s):

Heat Transfer ◽

Pressure Drop ◽

Heat Sink ◽

Heat Transfer Performance ◽

Numerical Study ◽

Flow Characteristics ◽

Fluid Mixing ◽

Microchannel Heat Sink ◽

Transfer Enhancement ◽

Side Walls

The present study focuses on the numerical study of thermal and flow characteristics in a microchannel heat sink with alternating trapezoidal cavities in sidewall (MTCS). The effects of flow rate and heat flux on friction factor and Nusselt are presented. The results showed considerable improvement heat transfer performance micro channel heat sink with alternating trapezoidal cavities in sidewall with an acceptable pressure drop. The heat transfer rate has improved in the cavity area due the greater fluid mixing in fluid vortices and thermal boundary layer disruption. The slipping over the reentrant cavities and pressure gain reduces pressure drop appears as the reason behind of only minor pressure drop due to the cavities.

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