Study on improvement of compactness of a plate heat exchanger using a newly designed primary surface

Doo, Jeong Hoon; Yoon, Hyun Sik; Ha, Man Yeong

doi:10.1016/j.ijheatmasstransfer.2010.07.066

Cited by 21 publications

(3 citation statements)

References 21 publications

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“…Through experiments, Burgess et al 15 showed the influence of the dimple depth and the dimple imprint diameter on heat transfer, and found that the local and spatially-averaged Nusselt number augmentations increase with an increase in the dimple depth, for various Reynolds numbers from 12,000 to 70,000. Doo et al 16 conducted a parametric study on flows passing through a channel with newly designed surface shapes that comprised of a combination of dimple and riblet. The superior thermo-aerodynamic performance, assessed in terms of the volume goodness factor, was predicted in the riblet-mounted dimple case with a riblet angle of 60°.…”

Section: Previous Study Regarding the Application Of Dimple Structurementioning

confidence: 99%

Dimples and heat transfer efficiency

Ghani¹,

Derani²,

Mahmood³

2018

MSEIJ

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A short review was conducted with regards to functions of dimple structures to increase the heat transfer efficiency. Dimples are among the important structure in surface texturing used to improve the parts performance such heat transfer efficiency. A review of the results of previous research found that dimple surfaced can enhance the heat transfer rate by up to 150% compared to smooth surfaces, and in certain cases the heat transfer rate is about 2.5 times higher than that of smooth surfaces. Therefore, it is believed that the dimple structure can help to enhance the product performance in various applications especially involved high temperature service conditions.

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Section: Previous Study Regarding the Application Of Dimple Structurementioning

confidence: 99%

Dimples and heat transfer efficiency

Ghani¹,

Derani²,

Mahmood³

2018

MSEIJ

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“…Though deeper dimples (with depth d to diameter D ratios, d/D > 30%) enjoy higher heat transfer rates, they also suffer from greater pressure losses, thereby restricting their applications. Hence instead of simply increasing the depth of axisymmetric circular dimples to increase heat transfer rates, new dimple shapes such as teardrop shaped dimples [7], dimples with streamwise ridges [8] and oval shaped dimples [9] have been investigated in efforts to obtain higher effective heat transfer efficiency of dimpled surfaces. Non-axisymmetric or non-circular dimples, potentially capable of both increasing heat transfer rates while suppressing pressure losses, may be more effective than axisymmetric ones in heat exchangers.…”

Section: Introductionmentioning

confidence: 99%

“…Non-axisymmetric or non-circular dimples, potentially capable of both increasing heat transfer rates while suppressing pressure losses, may be more effective than axisymmetric ones in heat exchangers. However, such dimple shapes may be more difficult to manufacture compared with circular axisymmetric dimples [7,8] or may be limited to a smaller coverage area due to its specific geometry [9].…”

Section: Introductionmentioning

confidence: 99%

Flow and Heat Transfer in Turbulent Channel Flow over Circular Dimples: Effect of Location of the Deepest Point Of Dimples

Khoo¹,

Chen²,

Tay³

2018

Proceedings of the 3rd World Congress on Momentum, Heat and Mass Transfer

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Circular axisymmetric dimples often exhibit a region of flow recirculation at the upstream portion of the dimple, leading to increased flow resistance and reducing heat transfer. To reduce this flow recirculation, the upstream wall slope may be reduced. Two methods of achieving this are to reduce the dimple depth, and to shift the deepest point of the dimple downstream. Circular nonaxisymmetric dimples with depth to diameter ratios up to 17.5% are studied numerically and experimentally in a fully developed turbulent channel regime. The results show that shallow dimples with depth to diameter ratios of 5% and below are not favourable for heat transfer due to their weaker heat transfer enhancement ability. Deeper dimples with depth to diameter ratios of 10% and above exhibit significantly greater heat transfer enhancement. Movement of the deepest point of the dimple downstream have the effect of reducing flow recirculation at the upstream portion and increased fluid ejection at the downstream edge due to flow impingement there. Both these effects lead to improved heat transfer of the dimple surface. Movement of the deepest point of the dimple streamwise also affects the friction factor due to the dimples. For shallow dimples with depth to diameter ratios of 5%, shifting the deepest point downstream reduces the friction factor due to the more significant effect the reduced flow separation has on the friction factor. For deeper dimples with depth to diameter ratios of 15%, movement of the deepest point downstream however leads to increasing friction factor due to the more significant effect of the flow impingement on the friction factor for these deeper dimples.

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Pressure loss and heat transfer characteristics in a dimpled channel with crescent-shaped protrusion

Jeong

Park

2021

Heat Mass Transfer

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Study on improvement of compactness of a plate heat exchanger using a newly designed primary surface

Cited by 21 publications

References 21 publications

Dimples and heat transfer efficiency

Dimples and heat transfer efficiency

Flow and Heat Transfer in Turbulent Channel Flow over Circular Dimples: Effect of Location of the Deepest Point Of Dimples

Pressure loss and heat transfer characteristics in a dimpled channel with crescent-shaped protrusion

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