Effect of Aspect Ratio on the Buoyancy Driven Reverse Flow Near the Leading Wall of Rotating Cooling Passages

Tekriwal, Prabhat

doi:10.1115/96-gt-173

Cited by 5 publications

(2 citation statements)

References 9 publications

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“…In Ahmedabad specifically-three-quarters of dog owners being first-time dog owners, with the majority having begun ownership in the last four years or even more recently-it appears that dog ownership represents a dramatically increasing trend, supporting previous observations [9]. Indeed, HSI's 2023 Vadodara survey indicates an almost doubling of the owned-dog density since 2017 [HSI, unpublished data].…”

Section: Owned-dog Densitymentioning

confidence: 67%

“…Furthermore, the lack of information on the development and shifts in dog ownership in India makes it difficult to accurately project population estimates for the future. Undoubtedly, however, pet ownership in India is increasing, with preliminary predictions of as much as a 12% growth in the owned-pet population annually [9]; however, in-depth analyses are yet to be conducted. Additional studies throughout India-both rural and urban-are needed to better comprehend the current state and future forecast of the owned-canine population.…”

Section: Estimating the Owned-dog Population Of Indiamentioning

confidence: 99%

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Owned-Dog Demographics, Ownership Dynamics, and Attitudes across Three States of India

Brill,

Chaudhari,

Polak

et al. 2024

Animals

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This paper presents the demographics, dynamics, and attitudes of dog ownership across three states in India. The background of this research is set against the increasing significance of pet ownership in urban Indian contexts, with a particular focus on understanding the variations in dog-ownership patterns and their implications for public health and animal welfare. We employed a survey-based approach, gathering quantitative survey data from dog owners (n = 563) and non-dog-owners (n = 9282) across different socioeconomic and geographic backgrounds in seven Indian settlements. The results reveal notable differences in dog-ownership patterns, influenced by regional state. In particular, settlements in Gujarat were found to have significantly fewer dog-owning households than those in Tamil Nadu, with no differences found according to settlement size. Dog ownership was found to be more common in households of higher socioeconomic standing, and settlements in Uttarakhand were found more frequently to possess dogs for reasons other than companionship. Data from Ahmedabad and Vadodara, specifically, also indicate rapidly increasing rates of pet ownership. Sterilisation and rabies vaccination proportions were typically low and high, respectively, across all settlements, with few significant differences found among settlements. Confinement of owned dogs at night was significantly lower in Nainital than all other settlements. Differences in attitudes towards roaming dogs between dog owners and non-dog-owners were also examined, with the results indicating both positive and negative trends accordingly. Our results emphasise the need for region-specific strategies in public health and animal welfare policies, acknowledging the diverse nature of pet ownership in India. This research provides valuable insight for policymakers and animal welfare organisations, underlining the importance of tailored approaches to address the unique challenges and opportunities in the Indian context.

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Section: Owned-dog Densitymentioning

confidence: 67%

Section: Estimating the Owned-dog Population Of Indiamentioning

confidence: 99%

Owned-Dog Demographics, Ownership Dynamics, and Attitudes across Three States of India

Brill,

Chaudhari,

Polak

et al. 2024

Animals

View full text Add to dashboard Cite

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Heat Transfer in 1:4 Rectangular Passages With Rotation

Agarwal

Acharya

Nikitopoulos

2003

Journal of Turbomachinery

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The paper presents an experimental study of heat/mass transfer coefficient in 1:4 rectangular channel with smooth or ribbed walls for Reynolds number in the range of 5000–40,000 and rotation numbers in the range of 0–0.12. Such passages are encountered close to the mid-chord sections of the turbine blade. Normal ribs (e/Dh=0.3125 and P/e=8) are placed on the leading and the trailing sides only. The experiments are conducted in a rotating two-pass coolant channel facility using the naphthalene sublimation technique. For purposes of comparison, selected measurements are also performed in a 1:1 cross section. The local mass-transfer data in the fully developed region is averaged to study the effect of the Reynolds and the rotation numbers. The spanwise mass transfer distributions in the smooth and the ribbed cases are also examined.

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1998 Heat Transfer Committee Best Paper Award: Complementary Velocity and Heat Transfer Measurements in a Rotating Cooling Passage With Smooth Walls

Bons

Kerrebrock

1999

Journal of Turbomachinery

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An experimental investigation was conducted on the internal flowfield of a simulated smooth-wall turbine blade cooling passage. The square cross-sectioned passage was manufactured from quartz for optical accessibility. Velocity measurements were taken using Particle Image Velocimetry for both heated and non-heated cases. Thin film resistive heaters on all four exterior walls of the passage allowed heat to be added to the coolant flow without obstructing laser access. Under the same conditions, an infrared detector with associated optics collected wall temperature data for use in calculating local Nusselt number. The test section was operated with radial outward flow and at values of Reynolds number and Rotation number typical of a small turbine blade. The density ratio was 0.27. Velocity data for the non-heated case document the evolution of the Coriolis-induced double vortex. The vortex has the effect of disproportionately increasing the leading side boundary layer thickness. Also, the streamwise component of the Coriolis acceleration creates a considerably thinned side wall boundary layer. Additionally, these data reveal a highly unsteady, turbulent flowfield in the cooling passage. Velocity data for the heated case show a strongly distorted streamwise profile indicative of a buoyancy effect on the leading side. The Coriolis vortex is the mechanism for the accumulation of stagnant flow on the leading side of the passage. Heat transfer data show a maximum factor of two difference in the Nusselt number from trailing side to leading side. A first-order estimate of this heat transfer disparity based on the measured boundary layer edge velocity yields approximately the same factor of two. A momentum integral model was developed for data interpretation, which accounts for coriolis and buoyancy effects. Calculated streamwise profiles and secondary flows match the experimental data well. The model, the velocity data, and the heat transfer data combine to strongly suggest the presence of separated flow on the leading wall starting at about five hydraulic diameters from the channel inlet for the conditions studied.

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Effect of Aspect Ratio on the Buoyancy Driven Reverse Flow Near the Leading Wall of Rotating Cooling Passages

Cited by 5 publications

References 9 publications

Owned-Dog Demographics, Ownership Dynamics, and Attitudes across Three States of India

Owned-Dog Demographics, Ownership Dynamics, and Attitudes across Three States of India

Heat Transfer in 1:4 Rectangular Passages With Rotation

1998 Heat Transfer Committee Best Paper Award: Complementary Velocity and Heat Transfer Measurements in a Rotating Cooling Passage With Smooth Walls

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