Enhancement of forced convection heat transfer in a three-dimensional laminar channel flow with insertion of a moving block

Fu, Wu‐Shung; Huang, Jieh-Ming; Li, Chung-Gang

doi:10.1016/j.ijheatmasstransfer.2010.05.007

Cited by 9 publications

(2 citation statements)

References 34 publications

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“…Considerable research studies were carried out to examine heat transfer rates due to a channel flow. Enhancement of forced convection heat transfer in a laminar channel flow with presence of a moving block was studied by Fu et al (2010). Their findings revealed that the presence of a moving block modified the thermal boundary layer at the channel wall and improved the heat transfer rates in the channel, especially in the down stream of the heat source.…”

Section: Introductionmentioning

confidence: 99%

Flow over a heated block in a vertical channel

Shuja

Yilbaş

2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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Purpose -The heat transfer rates from the body to the working fluid can be improved through altering geometric configurations of the body and its arrangement in the flow system. One of the arrangements for this purpose is to locate the body at the channel inlet while the convection current opposes it. Since the flow field in the channel inlet influences the heat transfer rates, changing the aspect ratio and inclination of the body is expected to modify the flow field while enhancing the heat transfer rates. Consequently, investigation into the influence of the aspect ratios and tilting angles of the body on the heat transfer rates in the channel flow becomes essential. The paper aims to discuss these issues. Design/methodology/approach -Numerical simulation of flow in a channel with the presence of solid block is carried out. The block aspect ratio is changed while keeping the area of the block constant for all aspect ratios. The tilting angle is also incorporated analysis to examine its effect on the Nusselt number. Findings -The throttling effect of the block at channel inlet accelerates the flow between the channel wall and the block faces. This, in turn modifies the thermal boundary layer around the block. In this case, heat transfer rates increase considerably at the block faces where the flow acceleration suppresses the thermal boundary layer thickness. This is more pronounced for large block tilting angles. The Nusselt number attains low values for the block face opposing to the flow at the channel inlet and the back face of the block. This is attributed to the mixing of the thermal current emanating from the side faces of the block in the region close to the back surface. In this case, thermal boundary layer thickens and the heat transfer rates from the block reduce significantly. The Nusselt number improves with reducing the block aspect ratio, which is particularly true along the side faces of the block. In addition, the influence of the block tilting angle on the Nusselt number is considerable for the low block aspect ratios.Research limitations/implications -The model study is validated with the previous studies for the drag coefficient. The study covers all the aspects of the flow situations and discusses the resulting fluid field and the heat transfer rates from the block. Practical implications -It is an interesting work for cooling applications. The block aspect ratio and its tilting angle in the channel influence considerably the flow field and the Nusselt number variation around the block faces. Social implications -The cooling technology may be improved through implementing the findings of the current work. Originality/value -It is an original work and it has never been submitted to other journals.

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Section: Introductionmentioning

confidence: 99%

Flow over a heated block in a vertical channel

Shuja

Yilbaş

2014

International Journal of Numerical Methods for Heat &Amp; Fluid Flow

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“…When the pulsating frequency was twice the natural shedding frequency, heat transfer from cylinder was extremely enhanced. Fu et al (2010) numerically studied 3-dimensional laminar channel flow with insertion of moving block. While block was moving, circulated flows were apparently generated at downstream.…”

Section: Introductionmentioning

confidence: 99%

Heat Transfer Enhancement of Small Scale Heat Sinks Using Vibrating Pin Fin

Gururatana

2013

American Journal of Applied Sciences

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Heat sinks are widely adopted in electronics cooling together with different technologies to enhance the cooling process. For the small electronics application, the small scale pin fins heat sinks are extensively used to dissipate heat in electronics devices. Due to the limit of space in the small devices, it is impossible to increase heat transfer area. In order to improve the heat transfer performance, the applying the forced vibration is one of challenging method. This study applies the vibration frequency between 50 to 1,000 Hz to pin fins heat sinks. The results of numerical simulation clearly show satisfied heat transfer augmentation. However, the Pressure drop significantly increases with frequency. This phenomenon affects the heat transfer enhancement performance that it increases with frequency until certain value then it drops rapidly. The results of this study can help designing heat sinks for electronics cooling by employing the concept of vibration.

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Enhancement of mixed convection heat transfer in a three-dimensional horizontal channel flow by insertion of a moving block

Chen

Wang

et al. 2012

International Communications in Heat and Mass Transfer

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Enhancement of forced convection heat transfer in a three-dimensional laminar channel flow with insertion of a moving block

Cited by 9 publications

References 34 publications

Flow over a heated block in a vertical channel

Flow over a heated block in a vertical channel

Heat Transfer Enhancement of Small Scale Heat Sinks Using Vibrating Pin Fin

Enhancement of mixed convection heat transfer in a three-dimensional horizontal channel flow by insertion of a moving block

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