Effect of rib height on heat transfer in a two pass rectangular channel (AR=1:4) with a sharp entrance at high rotation numbers

Huh, Michael; Liu, Yao-Hsien; Han, Je-Chin

doi:10.1016/j.ijheatmasstransfer.2009.03.021

Cited by 40 publications

(7 citation statements)

References 29 publications

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“…Results showed that the 0-deg channel orientation creates a greater heat transfer difference between the leading and trailing walls than the 45-deg channel for both aspect ratio under rotating conditions. In 2009 and 2012, Huh et al [24,25] (Ro 6 0.45) investigated heat transfer in rotating two-pass rectangular channel with channel orientation angles of 0 and 45-deg. Their observed that channel orientation could enhance heat transfer on leading surface in the first passage at high rotation numbers.…”

Section: Effects Of Channel Orientationmentioning

confidence: 99%

Heat transfer investigation in rotating smooth square U-duct with different wall-temperature ratios and channel orientations

Deng

et al. 2015

International Journal of Heat and Mass Transfer

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Section: Effects Of Channel Orientationmentioning

confidence: 99%

Heat transfer investigation in rotating smooth square U-duct with different wall-temperature ratios and channel orientations

Deng

et al. 2015

International Journal of Heat and Mass Transfer

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“…Heat transfer enhancement on these surfaces subsides, and the Nusselt numbers remain relatively constant as the rotation number continues to increase. Moving from the trailing edge of the airfoil to the leading edge of the airfoil (AR = 1:4), Liu et al [108] and Huh et al [109] measured the effect of rotation in tall, rectangular channels. In the smooth channel, heat transfer in the first pass was heavily influenced by the strong, redirection at the inlet of the channel.…”

Section: Heat Transfer Enhancement Under Advanced Engine Conditionsmentioning

confidence: 99%

Heat Transfer Enhancement for Turbine Blade Internal Cooling

Wright

Han

2013

Volume 3: Gas Turbine Heat Transfer; Transport Phenomena in Materials Processing and Manufacturing; Heat Transfer in Electronic

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Gas turbines are used extensively for aircraft propulsion, land-based power generation, and industrial applications. The turbine inlet temperatures are far above the permissible metal temperatures. Therefore, there is a need to cool the blades for safe operation. Modern developments in turbine cooling technology play a critical role in increasing the thermal efficiency and power output of advanced gas turbine designs. Turbine blades and vanes are cooled internally and externally. This paper focuses on heat transfer augmentation of turbine blade internal cooling. Internal cooling is typically achieved by passing the cooling air through rib-enhanced serpentine passages inside the blades. Impinging jets, pin fins and dimples are also used for enhancing internal cooling heat transfer. In the past 10 years, there has been considerable progress in turbine blade internal cooling research and this paper is emphasized on reviewing selected publications to reflect recent developments in this area. In particular, this paper focuses on the newly developed design concepts as well as the combination of existing cooling techniques for turbine airfoil internal heat transfer augmentation. Rotation effects on the turbine blade leading-edge, triangular-shaped channel, mid-chord multi-pass channel and trailing-edge, wedge-shaped channel with coolant ejection are also considered.

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“…They found that the presence of ribs in the surface of microchannel led to increase the Nusslet number and the friction factor. Hunh et al [10] has conducted an experimental investigation to evaluate the impact of tooth height on heat transfer in rectangular channels. Their study revealed that increasing the blockage ratio enhanced the convective heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

Madani¹

2018

Journal of Thermal Engineering

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A 2-D numerical investigation was carried out to study the effect of spacing between ribs on nanofluid flow and heat transfer inside a horizontal micro-channel. Two identical ribs were placed at the lower wall of micro-channel with variable spacing between them. The alumina oxide nanoparticles was suspended in water as based fluid at different volume fraction 0, 2 and 4%. The finite volume method was used to solve the continuity, momentum and energy equations. The effects of different parameters such as nanoparticles volume fraction, Reynolds number, and the spacing between ribs has been evaluated. The results showed that increasing nanoparticles volume fraction and Reynolds number significantly enhanced the heat transfer and the Poiseuille number. The presence of ribs improves the heat transfer. However, increasing the spacing between ribs leads to decrease the heat transfer rate.

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Effect of rib height on heat transfer in a two pass rectangular channel (AR=1:4) with a sharp entrance at high rotation numbers

Cited by 40 publications

References 29 publications

Heat transfer investigation in rotating smooth square U-duct with different wall-temperature ratios and channel orientations

Heat transfer investigation in rotating smooth square U-duct with different wall-temperature ratios and channel orientations

Heat Transfer Enhancement for Turbine Blade Internal Cooling

Numerical Investigation of Cooling a Ribbed Microchannel Using Nanofluid

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