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Local heat/mass transfer distributions on the bottom surface of a cavity of circular or elliptical cross-section in a turbulent boundary layer flow.

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Title: Local heat/mass transfer distributions on the bottom surface of a cavity of circular or elliptical cross-section in a turbulent boundary layer flow.
Authors: Sachdeva, M.1 (AUTHOR), Srinivasan, V.1 (AUTHOR) vinods@umn.edu
Source: International Journal of Heat & Mass Transfer. Dec2025, Vol. 253, pN.PAG-N.PAG. 1p.
Subjects: Mass transfer, Turbulent boundary layer, Fluid dynamics, Heat transfer, Reynolds number
Abstract: Convective mass transport on the bottom surface of right circular and elliptic cylindrical cavities exposed to an approaching boundary layer flow was experimentally studied using a naphthalene sublimation-based technique. Emphasis was given to cavities with diameter/major axis to height ratio (D / H or 2 a / H) less than 6, for which it is known that the streamwise flow shears pass the cavity, impinging on the downstream wall without reattaching on the bottom surface. The effects of Reynolds number, diameter-to-height ratio for circular cavities (0.3–6) and ellipse axis ratio (2 a / 2 b = 2 − 7. 15) for a fixed height and ellipse yaw angle to the freestream were investigated. The mass transfer distributions on the bottom surface are used to infer the flow structure and compared with the previous literature. Overall, circular and elliptical cavities display higher mass transfer relative to their rectangular counterparts on an area-averaged basis, with moderate yaw angles further increasing the transport for elliptical cavities. Mass transfer along the cavity centerline is similar for all shapes without yaw; however, laterally-averaged values differ significantly due to the more complex flow structure in the cylindrical and elliptical cavities relative to their rectangular counterparts. • Mass transfer is measured on the bottom surface of cylindrical cavities of circular and elliptic cross-section. • The effects of Reynolds numbers, yaw angle and cavity dimensions in streamwise and/or transverse direction relative to cavity height are documented. • Elliptical cavities with a finite yaw angle provide the highest area-averaged mass transfer. • Comparison with rectangular cavities using normalized area allows for collapse of data independent of cavity shape. • Flow structures are inferred from detailed local mass transfer coefficient distributions. [ABSTRACT FROM AUTHOR]
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Database: Engineering Source
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Abstract:Convective mass transport on the bottom surface of right circular and elliptic cylindrical cavities exposed to an approaching boundary layer flow was experimentally studied using a naphthalene sublimation-based technique. Emphasis was given to cavities with diameter/major axis to height ratio (D / H or 2 a / H) less than 6, for which it is known that the streamwise flow shears pass the cavity, impinging on the downstream wall without reattaching on the bottom surface. The effects of Reynolds number, diameter-to-height ratio for circular cavities (0.3–6) and ellipse axis ratio (2 a / 2 b = 2 − 7. 15) for a fixed height and ellipse yaw angle to the freestream were investigated. The mass transfer distributions on the bottom surface are used to infer the flow structure and compared with the previous literature. Overall, circular and elliptical cavities display higher mass transfer relative to their rectangular counterparts on an area-averaged basis, with moderate yaw angles further increasing the transport for elliptical cavities. Mass transfer along the cavity centerline is similar for all shapes without yaw; however, laterally-averaged values differ significantly due to the more complex flow structure in the cylindrical and elliptical cavities relative to their rectangular counterparts. • Mass transfer is measured on the bottom surface of cylindrical cavities of circular and elliptic cross-section. • The effects of Reynolds numbers, yaw angle and cavity dimensions in streamwise and/or transverse direction relative to cavity height are documented. • Elliptical cavities with a finite yaw angle provide the highest area-averaged mass transfer. • Comparison with rectangular cavities using normalized area allows for collapse of data independent of cavity shape. • Flow structures are inferred from detailed local mass transfer coefficient distributions. [ABSTRACT FROM AUTHOR]
ISSN:00179310
DOI:10.1016/j.ijheatmasstransfer.2025.127494