Detailed Measurements of Local Heat Transfer Coefficient and Adiabatic Wall Temperature Beneath an Array of Impinging Jets

Treuren, Kenneth W. Van; Wang, Zuolan; Ireland, Peter T.; Jones, T. V.

doi:10.1115/93-gt-205

Cited by 15 publications

(24 citation statements)

References 7 publications

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“…The agreement to the measured pressure data is seen to be excellent and the analysis was later used to predict the variation of local Rey throughout the array. Excellent agreement between the experiments and theory was also shown for the inline array, (Van Treuren et al, 1993).…”

Section: Static Pressuresupporting

confidence: 57%

“…Tom,-Tw and the adiabatic wall temperature, T. (Van Treuren et al, 1993). In the present work, the small experimental gas to wall temperature difference means that the effect of property variation on heat transfer is expected to be negligible.…”

Section: Discussionmentioning

confidence: 67%

“…The experimental apparatus, shown in Fig. 1, has been previously described in Van Treuren et al (1993) in detail. The impingement plate thickness to hole diameter ratio, lid, is 1.2 and the target plate is 1, 2, and 4 diameters from the impingement plate.…”

Section: Experimental Apparatusmentioning

confidence: 99%

“…A semiconductor pressure transducer with 0.1 ms response time was used to measure the time for the flow to establish. The instrumentation and data acquisition system remained as described by Van Treuren et al (1993). For the inline arrays, a coating which combined three different encapsulated liquid crystals was used to measure the surface temperature of the perspex target surface.…”

Section: Experimental Apparatusmentioning

confidence: 99%

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Local Heat Transfer Coefficient and Adiabatic Wall Temperature Measurement Beneath Arrays of Staggered and Inline Impinging Jets

Treuren

Wang

Ireland

et al. 1994

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

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Recent work, Van Treuren et al. (1993), has shown the transient method of measuring heat transfer under an array of impinging jets allows the determination of local values of adiabatic wall temperature and heat transfer coefficient over the complete surface of the target plate. Using this technique, an inline array of impinging jets has been tested over a range of average jet Reynolds numbers (10,000–40,000) and for three channel height to jet hole diameter ratios (1, 2, and 4). The array is confined on three sides and spent flow is allowed to exit in one direction. Local values are averaged and compared with previously published data in related geometries. The current data for a staggered array is compared to those from an inline array with the same hole diameter and pitch for an average jet Reynolds number of 10,000 and channel height to diameter ratio of one. A comparison is made between intensity and hue techniques for measuring stagnation point and local distributions of heat transfer. The influence of the temperature of the impingement plate through which the coolant gas flows on the target plate heat transfer has been quantified.

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Section: Static Pressuresupporting

confidence: 57%

Section: Discussionmentioning

confidence: 67%

Section: Experimental Apparatusmentioning

confidence: 99%

Section: Experimental Apparatusmentioning

confidence: 99%

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Local Heat Transfer Coefficient and Adiabatic Wall Temperature Measurement Beneath Arrays of Staggered and Inline Impinging Jets

Treuren

Wang

Ireland

et al. 1994

Volume 4: Heat Transfer; Electric Power; Industrial and Cogeneration

Self Cite

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“…Qualitatively, all of the works reveal that the impingement heat transfer is increased with increasing jet Reynolds number, and is proportional to Re , where 0.5<m<1.0. Quantitative comparison is -• not available because of much difference in the duct and jet geometry between the present work and those of Van Treuren et al (1994) and Huang etal. (1998).…”

Section: Detailed Heat Transfer Coefficient Distributionmentioning

confidence: 79%

Heat Transfer Enhancement in Triangular Ducts With an Array of Side-Entry Wall/Impinged Jets

Hwang

Cheng

Tsia

1999

Volume 3: Heat Transfer; Electric Power; Industrial and Cogeneration

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An experimental study has been performed to measure local heat transfer coefficients and static well pressure drops in leading-edge triangular ducts cooled by wall/impinged jets. Coolant provided by an array of equally spaced wall jets is aimed at the leading-edge apex and exits from the radial outlet. Detailed heat transfer coefficients are measured for the two walls forming the apex using transient liquid crystal technique. Secondary-flow structures are visualized to realize the mechanism of heat transfer enhancement by wall/impinged jets. Three right-triangular ducts of the same altitude and different apex angles of β = 30 deg (Duct A), 45 deg (Duct B) and 60 deg (Duct C) are tested for various jet Reynolds numbers (3000≦Rej≦12600) and jet spacings (s/d = 3.0 and 6.0). Results show that an increase in Rej increases the heat transfer on both walls. Local heat transfer on both walls gradually decreases downstream due to the crossflow effect. At the same Rej, the Duct C has the highest wall-averaged heat transfer because of the highest jet center velocity as well as the smallest jet inclined angle. Moreover, the distribution of static pressure drop based on the local through flow rate in the present triangular duct is similar to that that of developing straight pipe flows. Average jet Nusselt numbers on the both walls have been correlated with jet Reynolds number for three different duct shapes.

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Flow and heat transfer studies of multijet impingement cooling for different configurations: A review

Gudla

Pujari

2022

Heat Trans

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Increasing the gas turbine engine's turbine intake temperature has long been a potential strategy for increasing the specific work output of the engine. However, the melting temperature of the turbine blades and vane material limits the maximum intake temperature. As a result, internal and external cooling techniques are commonly used to maintain the vane material in a safe condition. This study provided an overview of internal impingement cooling to highlight the significance of geometrical variations, such as flat plate, curve plate, and actual vanes. It was observed that flat and curved plate impingement heat transfer studies were reported extensively, whereas limited studies were found on the conjugate effects on airfoil surfaces. The importance of conjugate heat transfer studies and their impact has recently been described in the literature. In most of the literature, a wide range of instruments, such as Laser Doppler Velocimeter, Particle Image Velocimeter, liquid crystal sheets, and so forth, were used for experimental investigations. According to most studies, the local value of internal surface temperature and heat transfer coefficient are vital factors of local flow behavior. Jet‐to‐jet spacing, jet‐to‐plate spacing, jet hole diameter, and jet Reynolds numbers played a crucial role in both numerical and experimental analyses. Different geometric variations strongly influence flow behavior. Therefore, the usual method for determining interior temperature distributions and heat transfer coefficients by considering generalized geometries like the flat and curved plate may not produce accurate conjugate solutions. Most of the computational studies on the flat and curved plate indicate the usage of κ−ω shear stress transport and κ–ε realizable model to predict the heat transfer coefficient.

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Detailed Measurements of Local Heat Transfer Coefficient and Adiabatic Wall Temperature Beneath an Array of Impinging Jets

Cited by 15 publications

References 7 publications

Local Heat Transfer Coefficient and Adiabatic Wall Temperature Measurement Beneath Arrays of Staggered and Inline Impinging Jets

Local Heat Transfer Coefficient and Adiabatic Wall Temperature Measurement Beneath Arrays of Staggered and Inline Impinging Jets

Heat Transfer Enhancement in Triangular Ducts With an Array of Side-Entry Wall/Impinged Jets

Flow and heat transfer studies of multijet impingement cooling for different configurations: A review

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