Heat transfer augmentation in a microchannel heat sink with sinusoidal cavities and rectangular ribs

Ghani, Ihsan Ali; Kamaruzaman, Natrah; Sidik, Nor Azwadi Che

doi:10.1016/j.ijheatmasstransfer.2017.01.046

Cited by 188 publications

(45 citation statements)

References 29 publications

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“…Additionally, the influence of geometric parameters of triangular reentrant cavities was investigated, and the optimal ranges of these parameters were discussed. Ghani et al [15] analyzed the characteristics of flow and heat transfer in a microchannel heat sink numerically. There were sinusoidal cavities and rectangular ribs on the sidewalls of microchannels.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Flow and Heat Transfer Characteristics in Microchannel Heat Exchangers with Reentrant Cavities

Huang

2020

Micromachines

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The application of microchannel heat exchangers is of great significance in industrial fields due to their advantages of miniaturized scale, large surface-area-to-volume ratio, and high heat transfer rate. In this study, microchannel heat exchangers with and without fan-shaped reentrant cavities were designed and manufactured, and experiments were conducted to investigate the flow and heat-transfer characteristics. The impact rising from the radius of reentrant cavities, as well as the Reynolds number on the heat transfer and the pressure drop, is also analyzed. The results indicate that, compared with straight microchannels, microchannels with reentrant cavities could enhance the heat transfer and, more importantly, reduce the pressure drop at the same time. For the ranges of parameters studied, increasing the radius of reentrant cavities could augment the effect of pressure-drop reduction, while the corresponding variation of heat transfer is complicated. It is considered that adding reentrant cavities in microchannel heat exchangers is an ideal approach to improve performance.

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Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Flow and Heat Transfer Characteristics in Microchannel Heat Exchangers with Reentrant Cavities

Huang

2020

Micromachines

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Section: Introductionmentioning

confidence: 99%

“…Furthermore, a combination of various structures can be employed to promote the advantages and weaken the disadvantages of a single structure [21][22][23][24]. Ghani et al [22] proposed a novel MCHS with sinusoidal cross-mark cavities and rectangular ribs. The results showed that the thermal performance of an a novel MCHS with sinusoidal cross-mark cavities and rectangular ribs (MC-SCRR) was the most superior owing to the combination of two important features: a significant reduction of the pressure drop and an increase of the flow turbulence.…”

Section: Introductionmentioning

confidence: 99%

Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps

et al. 2019

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More efficient heat sinks are required due to the rapid increase of power density in microelectronic devices. In this study, a micro-array heat sink with stagger trapezoidal bumps was designed. Numerical simulations for the flow and heat transfer under various conditions were carried out to help us to fully understand the mechanisms of the heat transfer enhancement in such a heat sink. The effects of the structure of the heat sink, parameters of the bumps, and volume fraction of the nanofluid on the performance of heat sink were studied. The results show us that the bumps in the heat sink can result in chaotic convection, interrupting the thermal boundary layer and increasing the cooling area, subsequently improving the heat transfer performance. Furthermore, parametric investigations for trapezoidal bumps were conducted to obtain preferential values for parameters, such as the bump width, fore rake angle of the bump, bump height, and bump pitch.

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“…Combining the advantages of interrupted microchannel and passive microstructures, Chai et al [13,14] and Wong and Lee [15] introduced the staggered ribs into the transverse microchambers to improve the redeveloping thermal boundary layer. Combining the advantages of streamwise-periodic variations of cross-sectional area and passive microstructures, Xia et al [16,17,18] and Ghani et al [19,20] mounted the rectangular ribs into the microchannels with streamwise-periodically changed cross-sections for further heat transfer augmentation. Furthermore, Sidik et al [21] reviewed the passive techniques for heat transfer augmentation in microchannel heat sink, Ghani et al [22] comprehensively discussed the effect of channel design on the hydrothermal performance of microchannel heat sink, Dewan and Srivastava [23] reviewed the heat transfer enhancement through flow disruption in a microchannel, and Ghani et al [24] comprehensively analyzed the effect of manifold zone parameters on hydrothermal performance of microchannel heat sink.…”

Section: Introductionmentioning

confidence: 99%

Thermal-hydraulic performance of interrupted microchannel heat sinks with different rib geometries in transverse microchambers

Chai

Wang

2018

International Journal of Thermal Sciences

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The thermal-hydraulic performance of microchannel heat sinks with ribs in the interrupted transverse microchambers is studied using a three-dimensional conjugated heat transfer model and considering entrance effect, viscous heating and temperature-dependent thermophysical properties. Five different configurations of ribs and four lengths along the flow direction for every rib configuration are selected to analyze the effects of rib geometry on the thermal-hydraulic performance. The five rib configurations are rectangular, backward triangular, diamond, forward triangular and ellipsoidal, and the rib geometry parameters include expansion-constriction profile, ratio and length. The effects of rib geometry on thermal-hydraulic performance are firstly examined by the variations of friction factor and Nusselt number with Reynolds number, and corresponding correlations are proposed. Then, the conductive, convective and fluid capacitive thermal resistances are analyzed to obtain some insight into the basic heat transfer mechanism. Next, the entropy generation rates due to heat transfer and fluid friction are investigated for the analysis of the lost available work and irreversibility in the heat transfer process. Finally, the performance evaluation criteria is calculated to comprehensively assess the performance of such interrupted microchannel heat sinks with different rib geometry. For the studied operation parameters and rib geometries, the interrupted microchannel

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Heat transfer augmentation in a microchannel heat sink with sinusoidal cavities and rectangular ribs

Cited by 188 publications

References 29 publications

Experimental Investigation of the Flow and Heat Transfer Characteristics in Microchannel Heat Exchangers with Reentrant Cavities

Experimental Investigation of the Flow and Heat Transfer Characteristics in Microchannel Heat Exchangers with Reentrant Cavities

Parametric Investigation on a Micro-Array Heat Sink with Staggered Trapezoidal Bumps

Thermal-hydraulic performance of interrupted microchannel heat sinks with different rib geometries in transverse microchambers

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