Heat transfer of rectangular narrow channel with two opposite scale-roughened walls

Chang, Shyy Woei; Liou, Tong‐Miin; Lu, Ming Hsin

doi:10.1016/j.ijheatmasstransfer.2005.04.015

Cited by 49 publications

(69 citation statements)

References 13 publications

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“…4b. In order to highlight the relative HTE effects generated by the dimpled hexagonal test ducts, the various Nu/ Nu 1 measured from the ribbed channels [21][22][23], the scale- roughened channel [24] and the channel enhanced by the compound roughness of the deepened scales and V-ribs [25] are compared in Fig. 4b.…”

Section: Resultsmentioning

confidence: 99%

Heat transfer and pressure drop in hexagonal ducts with surface dimples

Chang

Chiang

Chou

2010

Experimental Thermal and Fluid Science

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Section: Resultsmentioning

confidence: 99%

Heat transfer and pressure drop in hexagonal ducts with surface dimples

Chang

Chiang

Chou

2010

Experimental Thermal and Fluid Science

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“…It has previously been shown that augmenting the fin surface with scales enhances the heat transfer without a significant increase in pressure drop [52]. Moreover, recent advances in three-dimensional metal printing techniques [53] make such surfaces readily attainable.…”

Section: Scale-roughened Surface Finsmentioning

confidence: 99%

“…A small or moderate increase in the heat transfer coefficient can more than offset even a large friction factor increase because flow velocity can then be decreased and friction power varies with as much as the cube of velocity [54]. The second optimization study uses the surface scales investigated by Chang et al [52] and more broadly correlated by Zhou et al [48], and employs a fixed scale diameter D of 1.00mm and a fixed scale height e of 0.10mm. The parameters that are varied and their ranges are the same as for the smooth surface case, see Table 1.…”

Section: Scale-roughened Surface Finsmentioning

confidence: 99%

Nonlocal Modeling and Swarm-Based Design of Heat Sinks

Geb¹,

Catton

2013

Journal of Heat Transfer

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Cooling electronic chips to satisfy the ever-increasing heat transfer demands of the electronics industry is a perpetual challenge. One approach to addressing this is through improving the heat rejection ability of air-cooled heat sinks, and nonlocal thermal-fluid-solid modeling based on Volume Averaging Thoery (VAT) has allowed for significant strides in this effort. A number of optimization methods for heat sink designers who model heat sinks with VAT can be envisioned due to VAT's singular ability to rapidly provide solutions, when compared to Direct Numerical Simulation (DNS) and Computational Fluid Dynamics (CFD)approaches. The Particle Swarm Optimization (PSO) method appears to be an attractive multiparameter heat transfer device optimization tool, however it has received very little attention in this field compared to its older population-based optimizer cousin, the Genetic Algorithm (GA).The PSO method is employed here to optimize smooth and scale-roughened straight-fin heat sinks modeled with VAT by minimizing heat sink thermal resistance for a specified pumping power. Optimal designs are obtained with the PSO method for both types of heat sinks, the performances of the heat sink types are compared, and the performance of the PSO method is discussed with reference to the GA method. This study demonstrates the effectiveness of combining a VAT-based nonlocal thermal-fluid-solid model with population-based optimization methods, such as PSO, to design heat sinks for electronics cooling applications.Nonlocal Modeling and Swarm-Based Design of Heat Sinks 2Geb, HT-xx-xxxx

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“…Methods of heat transfer augmentation for rotating channels involve surface ribs [10,[18][19][20][21][22][23][24]30], array of longitudinal humps [25], pin-fins [26], dimples [27] and impingement [28,29]. In our previous study [31], the characteristics of heat transfer and pressure drop in a static narrow rectangular channel roughened by deepened scales were examined. This type of surface roughness offers the heat transfer augmentations compatible to those of surface ribs and is ready to combine with the surface ribs for compound enhancements in order to provide the higher degrees of heat transfer augmentation than each individual technique applied separately.…”

Section: English Symbolsmentioning

confidence: 99%

“…1b using one dimensional heat conduction law. As our previous study demonstrates that the heat transfer and pressure-drop performances in the scaled roughened rectangular channel is directional [31], the forward flow configuration that offers the higher degree of heat transfer enhancement with the better thermal performance factor is adopted by the present study. The coordinate system in the streamwise (x) direction is selected along two mid-span centerlines of the bevel walls.…”

Section: Facilitiesmentioning

confidence: 99%