Combined forced and natural convection heat transfer for upward flow in a uniformly heated vertical pipe.

Tanaka, Hiroaki; Hatano, Shunichi; Maruyama, Shigeo

doi:10.1299/kikaib.52.4014

Cited by 12 publications

(17 citation statements)

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“…Turbulence model computations of mixed convection flows have been reported by Walklate [1976], Abdelmeguid and Spalding [1979], Tanaka et al [1987], Cotton and Jackson [1990], Yu [1991], Mikielewicz [1994], Kirwin [1995] and Kim et al [2006]. All those authors used various forms of two-equation closure and a finding to emerge from the studies taken together was that the 'lowReynolds-number' model of Launder and Sharma [1974] was generally superior to the other variants examined.…”

Section: 2) Review Of Previous Workmentioning

confidence: 99%

Refined Eddy Viscosity Schemes and Large Eddy Simulations for Ascending Mixed Convection Flows

Keshmiri

Addad

Cotton

et al. 2008

International Symposium on Advances in Computational Heat Transfer

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The present work is concerned with the modelling of ascending turbulent ('mixed convection') flow in a vertical heated pipe. All fluid properties are assumed to be constant and buoyancy is accounted for within the Boussinesq approximation. Four Eddy Viscosity Models (EVMs) are examined against experimental and numerical (direct simulation) data. The EVMs embody distinct physical refinements with respect to the parent high-Reynolds-number k-ε model. New Large Eddy Simulations (LES) are also presented. Three different CFD codes have been employed in the study: 'CONVERT', 'Code_Saturne', and 'STAR-CD', which are respectively inhouse, industrial, and commercial packages. In general, forced convection flows are best resolved by the LES computations and Cotton-Ismael turbulence model (Cotton and Ismael [1998]). In mixed convection flows the picture changes and the Launder-Sharma closure [Launder and Sharma, 1974] and 'Manchester f v 2 − ' model [Keshmiri et al., 2008] are in closest agreement with the direct simulation heat transfer data. Under conditions of maximum heat transfer impairment, the mean flow and turbulence profiles are best captured by the Large Eddy Simulations and LS and f v 2 − models. However, no single scheme could be said to be in excellent agreement with the data examined.

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Section: 2) Review Of Previous Workmentioning

confidence: 99%

Refined Eddy Viscosity Schemes and Large Eddy Simulations for Ascending Mixed Convection Flows

Keshmiri

Addad

Cotton

et al. 2008

International Symposium on Advances in Computational Heat Transfer

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“…It is commonly accepted that under heating (or cooling) condition with a lower flow the buoyancy force could have a complicated effect on the flow and heat transfer behavior. In a heated upward flow, which is generally termed as the aiding flow since the buoyancy force acts in the same direction as the flow, the buoyancy force would make a reduction of the shear-stress in the near-wall region, associated with the laminarization and even a delay in the transition of flow regime from the mixed convection to turbulent convection [6][7][8]. The significant reduction in the heat transfer coefficient observed in the present experiment at a rather high Reynolds number would be the result of the transition of flow regime from the turbulent convection to the mixed convection.…”

Section: Resultsmentioning

confidence: 99%

“…For the transition between turbulent convection and mixed convection, a criterion of the critical Reynolds number, Re fc , was derived by Tanaka et al [6], as follows:…”

Section: Resultsmentioning

confidence: 99%

Heat transfer with water flowing upward in a tube for pressures up to supercritical region

Chen

Yang

Zhang

et al. 2009

Front. Energy Power Eng. China

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A heat transfer experiment was conducted in a tube of 6.07 mm in diameter with water flowing upward, covering the ranges of pressure of 10-23 MPa, mass flux of 288-1298 kg/(m 2 $s), local water temperature of 78°C-270°C, heat flux of 0.23-1.18 MW/m 2 and Reynolds number of 5.5Â10 3 -3.9Â10 4 . The experimental results were compared with the predictions of the Dittus-Boelter correlation, Jackson correlation, Bishop correlation, Swenson correlation and Yamagata correlation. Significant deterioration in heat transfer was observed in both subcritical and supercritical region due to the effect of buoyancy force, but it was not predicted reasonably by the existing correlations.

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“…The review papers of Jackson et al [3] and Jackson [4] provide extended discussions of heat transfer performance under mixed convection conditions. The most popular computational fluid dynamics (CFD) technique adopted in simulating mixed convection flows is based on the solution of Reynolds-averaged Navier-Stokes (RANS) equations, and among the possible turbulence models available to close these equations, eddy-viscosity models (EVMs) have been employed by the majority of researchers including Abdelmeguid and Spalding [5], Tanaka et al [6], Cotton and Jackson [7], Mikielewicz et al [8], Richards et al [9], Kim et al [10], and Keshmiri et al [11][12][13], among others. Keshmiri et al [11,12] recently tested a wide range of RANS turbulence models and found that the k-ω-SST model [14] and the nonlinear eddy-viscosity model (NLEVM) of Craft, Launder, and Suga [15] completely failed to capture the laminarization phenomenon present in ascending mixed convection flows.…”

Section: Introductionmentioning

confidence: 99%

Assessment of a common nonlinear eddy-viscosity turbulence model in capturing laminarization in mixed convection flows

Keshmiri

Revell

Darabkhani

2015

Numerical Heat Transfer, Part A: Applications

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Laminarization is an important topic in heat transfer and turbulence modeling. Recent studies have demonstrated that several well-known turbulence models failed to provide accurate prediction when applied to mixed convection flows with significant re-laminarization effects. One of those models, a well-validated cubic nonlinear eddy-viscosity model, was observed to miss this feature entirely. This paper studies the reasons behind this failure by providing a detailed comparison with the baseline Launder-Sharma model. The difference is attributed to the method of near-wall damping. A range of tests have been conducted and two noteworthy findings are reported for the case of flow re-laminarization. ARTICLE HISTORY

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Combined forced and natural convection heat transfer for upward flow in a uniformly heated vertical pipe.

Cited by 12 publications

References 0 publications

Refined Eddy Viscosity Schemes and Large Eddy Simulations for Ascending Mixed Convection Flows

Refined Eddy Viscosity Schemes and Large Eddy Simulations for Ascending Mixed Convection Flows

Heat transfer with water flowing upward in a tube for pressures up to supercritical region

Assessment of a common nonlinear eddy-viscosity turbulence model in capturing laminarization in mixed convection flows

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