Momentum and energy transport in the accelerated fully rough turbulent boundary layer

Coleman, Hugh W.

doi:10.2172/7353223

Cited by 34 publications

(12 citation statements)

References 4 publications

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“…However, present results fall well within the bounds on the smooth-and rough-wall data given by Coleman et al (1976a). Most of the Pr, profile points measured by Antonia et al (1977) and Blom (1970) also fall within these bounds.…”

Section: Profilessupporting

confidence: 86%

“…The wind tunnel used for these tests was the HMT roughness rig descriged by Ligrani et al (1979b), Coleman et al (1976a), and Pimenta et al (1975). The test surface is 2.44 m long and consists of 24 plates, each of which is equipped with embedded electric heaters and instrumentation sufficient to calculate the net heat transfer from the plate to the air stream.…”

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

“…Stanton numbers for flows with an unheated starting length (for both naturally developed (Coleman et al, 1976a) and artificially thickened boundary layers) form an orderly array below the constant wall temperature curve. For large values of 5, the values of St at a given enthalpy thickness are lower.…”

Section: Stan 'On Numbersmentioning

confidence: 99%

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Thermal boundary layers on a rough surface downstream of steps in wall temperature

Ligrani

Moffat

1985

Boundary-Layer Meteorol

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Stanton numbers, mean temperature profiles, and turbulent heat flux profiles are presented for thermal boundary layers which develop over a uniformly rough surface downstream of steps in wall temperature. Artificially thickened hydrodynamic layers were employed in order to create large unheated starting lengths compared to boundary-layer thickness, where the unheated starting length is the distance between the temperature step and hydrodynamic boundary-layer origin. Kernel functions for Stanton number distributions with downstream distance are presented which agree with measurements even when the hydrodynamic layers are significantly thicker than thermal layers. Other effects of unheated starting lengths on rough-wall thermal boundary-layer behavior are described, including significant alterations in profiles of mean temperature and turbulent heat flux. Both change shape as the magnitude of the unheated starting length increases, even though logarithmic regions of temperature profiles in wall coordinates and turbulent Prandtl number distributions are largely unaffected by unheated starting-length effects.

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Section: Profilessupporting

confidence: 86%

Section: Experimental Apparatus and Proceduresmentioning

confidence: 99%

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Thermal boundary layers on a rough surface downstream of steps in wall temperature

Ligrani

Moffat

1985

Boundary-Layer Meteorol

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“…This is a graphic counterexample to the widely held belief that surfaces that are densely roughened with sand or that appear sand-grain-like (e.g., grit blasted) scale on a one-to-one basis with Nikuradse's sand roughness. Typical Velocity Profiles for a Fully Rough Turbulent Boundary Layer in Zero Pressure Gradient [5] in not always suggest that the proper origin has been selected. A further complication is the fact that Nikuradse did not state the origin for y in his report [1].…”

Section: Schlichting's Admonition About the Reproducibillty Of Sand-typementioning

confidence: 99%

Generalized Roughness Effects on Turbulent Boundary Layer Heat Transfer. A Discrete Element Predictive Approach for Turbulent Flow Over Rough Surfaces

Coleman¹,

Hodge²,

Taylor³

1983

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UNCLASSIFIED tKCUNITV CLASSIFICATION Of TMIi »*0C fVlran Oaf« Kriar»« 20. ABSTRACT (CONCLUDED) equations which describe momentum and energy transport In turbulent flows. The model includes the necessary empirical information on the interaction between the roughness elements and the flow around and between the elements in a general way which does not require experimental data on each specific surface. This empirical information is input via algebraic models for the local element drag coefficient and Nusselt number. These models have been cslibrated by comparison with base data sets from surfaces with three-dimensional (distributed) roughness elements. Calculations using the present discrete element model are compared with experimental data from 118 separate experimental runs. The results of these comparisons range from gooc* tc excellent. The calculations are shown to compare equally well with both transitionally rough turbulent flow and fully rough turbulent flow without modification of the roughness model. In the course of the present work it was discovered that the definitive data set of Schlichting is flawed. Corrected values are presented for this data set.

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“…In the research program mentioned above, a discrete element prediction approach for two-dimensional, nonisothermal turbulent boundary layer flow over a rough surface was derived from first principles (Taylor, Coleman and Hodge, 1985 (Healzer, 1974;Pimenta, 1975;Coleman, 1976 …”

Section: Introductionmentioning

confidence: 99%

Investigations of Rough Surface Effects on Friction Factors in Turbulent Pipe Flow

Taylor¹,

Coleman²,

Scaggs³

1988

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Momentum and energy transport in the accelerated fully rough turbulent boundary layer

Cited by 34 publications

References 4 publications

Thermal boundary layers on a rough surface downstream of steps in wall temperature

Thermal boundary layers on a rough surface downstream of steps in wall temperature

Generalized Roughness Effects on Turbulent Boundary Layer Heat Transfer. A Discrete Element Predictive Approach for Turbulent Flow Over Rough Surfaces

Investigations of Rough Surface Effects on Friction Factors in Turbulent Pipe Flow

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