Heat and mass transfer in turbulent flow under conditions of drag reduction

Hanna, Owen T.; Sandall, Orville C.; Mazet, P. R.

doi:10.1002/aic.690270424

Cited by 16 publications

(9 citation statements)

References 10 publications

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“…In fact, the dampinglength constant A is expected to vary somewhat with flow conditions. Later, in order to make the turbulent viscosity proportional to (1−φ) 3 at φ=1, HANNA et al [18] proposed the following modification for Eqn. (9):…”

Section: Model Based On Prandtl Mixing Length Theory (Model 1)mentioning

confidence: 99%

Improvement of Prandtl mixing length theory and application in modeling of turbulent flow in circular tubes

Luo

Liu

Luo

2008

J. Cent. South Univ. Technol.

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In order to correctly predict tube cross section time-smoothed velocity distribution, friction factor and mass transfer behavior, two models for turbulent flow in circular tubes based on classical Prandtl mixing length theory and a modified mixing length were established. The results show that the modified mixing length includes the introduction of a damping function for the viscous sublayer and the second-order derivative to approximate eddy velocity. The calculated dimensionless time-smoothed velocity from the model based on Prandtl mixing length is much better than the result from the concept of eddy viscosity. The calculated eddy viscosity from the model based on modified mixing length is much better than the result from the model based on the classical Prandtl mixing length theory. And the friction factor calculated from the model based on the modified mixing length agrees well with the reported empirical relationships.

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Section: Model Based On Prandtl Mixing Length Theory (Model 1)mentioning

confidence: 99%

Improvement of Prandtl mixing length theory and application in modeling of turbulent flow in circular tubes

Luo

Liu

Luo

2008

J. Cent. South Univ. Technol.

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“…In a series of papers (Hanna and Sandall, 1972, 1978Sandall et al, 1976Sandall et al, , 1980Sandall et al, , 1982Sandall et al, , 1984Sandall and Hanna, 1979;Hanna et a., 1981), two of the present authors have developed prediction formulas for turbulent mass or heat transfer based on an extended asymptotic expansion of the rigorous Lyon transport equation for the case of large Schmidt or Prandtl number. In the case of turbulent nowNewtonian heat transfer, this approach was used to develop the prediction formula of Sandall et al (1976), which is:…”

Section: Introductionmentioning

confidence: 98%

Experiments on turbulent non‐newtonian mass transfer in a circular tube

1986

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“…However, here the focus is on the description of exchange processes for simple geometries, and therefore, algebraic turbulence models are appropriate. In this work, the following eddy viscosity models are used: Prandtl mixing length, the Hanna-van Driest modification (van Driest 1956;Hanna et al 1981), and the Baldwin-Lomax model (Baldwin and Lomax 1978).…”

Section: Reynolds-averaged Navier-stokesmentioning

confidence: 99%

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

2016

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The interactions between turbulent free flow and flow in a porous medium are of key interest in different fields, e.g., meteorology, agriculture, building physics, and aerospace engineering. Properly understanding the strongly coupled exchange processes between the two domains is crucial to describing these interactions. In (Mosthaf et al. in Water Resour Res 47(10):W10522, 2011. doi:10.1029/2011WR010685), a concept for coupling laminar compositional single-phase free flow to compositional two-phase porous-medium flow under non-isothermal conditions was presented. In this study, the existing coupling concept is first extended to turbulent free-flow conditions. This includes the interface conditions between a Reynolds-averaged Navier-Stokes free flow using algebraic turbulence models and a Darcy porous-medium flow. Second, eddy viscosity and boundary layer models for a rough interface are integrated into this model concept. Results from laboratory evaporation experiments are used for comparison of the developed model concept. A sensitivity analysis of the evaporation rate and porous-medium quantities on different model setups, boundary conditions, BeaversJoseph coefficients, and roughness lengths is performed. Results demonstrate how including turbulence, either with eddy viscosity or boundary layer models, affects the evaporation rate. The model concept is able to predict early stage-I and intermediate to later stage-II evaporation rates. Sand-grain roughness concepts are successfully included into the model and show the desired qualitative effect.

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Heat and mass transfer in turbulent flow under conditions of drag reduction

Cited by 16 publications

References 10 publications

Improvement of Prandtl mixing length theory and application in modeling of turbulent flow in circular tubes

Improvement of Prandtl mixing length theory and application in modeling of turbulent flow in circular tubes

Experiments on turbulent non‐newtonian mass transfer in a circular tube

Effect of Turbulence and Roughness on Coupled Porous-Medium/Free-Flow Exchange Processes

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