Interfacial condensation for countercurrent steam–water stratified wavy flow in a horizontal circular pipe

Lee, Kyung-Won; Chu, In-Cheol; Shen, Yu; No, Hee Cheon

doi:10.1016/j.ijheatmasstransfer.2006.02.017

Cited by 17 publications

(3 citation statements)

References 8 publications

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“…Over the last few decades, multiple experimental studies on direct-contact condensation heat and mass transfer under two-phase flow conditions have been performed, and a considerable number of empirical correlations for the all-important condensation heat transfer coefficient have been proposed (Linehan et al 1970;Segev et al 1981;Kim and Bankoff 1983;Bankoff and Lee 1987;Lee et al 2006). All correlations are expressed in the form of a Nusselt number Nu = HTC L L∕ L (where L is a characteristic length scale and L is the thermal conductivity); the Nusselt number expresses the ratio of convective to conductive heat transfer.…”

Section: Introductionmentioning

confidence: 99%

DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow

Апанасевич

Lucas

Sato

et al. 2022

Flow Turbulence Combust

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A comprehensive study of direct-contact condensation heat transfer for turbulent, counter-current, liquid/vapour flow in a nearly horizontal channel at high pressure (i.e. 5 MPa) has been carried out based on Direct Numerical Simulation (DNS) and highly-resolved Large Eddy Simulation (LES) approaches. To simulate the two-phase flow situation, driven in this case by a constant pressure gradient, a single set of Navier–Stokes equations, coupled with an enthalpy conservation equation, have been employed. The interfacial mass transfer, seen in this case to be dominated by condensation, has been calculated directly from the heat flux at the liquid/vapour interface. To investigate the effect of condensation on the turbulence phenomena, and vice versa, cases have been considered involving two friction Reynolds numbers: namely $$Re_{*}=u_{*}h/\nu =178$$ R e ∗ = u ∗ h / ν = 178 and $$Re_{*}=u_{*}h/\nu =590$$ R e ∗ = u ∗ h / ν = 590 ($$u_{*}=(h\varDelta P/\rho )^{1/2}$$ u ∗ = ( h Δ P / ρ ) 1 / 2 ). At the lower Reynolds number, three levels of water subcooling—0 K, 10 K and 40 K—have been investigated. The use of water subcooling of 0 K has enabled the validation and verification procedures associated with the numerical approach to be compared against experimental and numerical data reported in the literature. The choice of the maximum degree of water subcooling is dictated by the need to justify the periodic boundary conditions applied in this numerical study. In the simulation for the higher Reynolds number, only the case of 10 K subcooling has been included, as a consequence of the very high computation effort involved. A detailed statistical analysis of the DNS and LES data obtained from the application of the well-known wall laws has also been assessed. In the vicinity of the liquid/vapour interface, the characteristics of the turbulent motions appear somewhat diverse, depending on whether the interface is basically flat or wavy in character. For a flat interface, some damping effect of the presence of the interface on the turbulence intensity has been observed, a feature which becomes enhanced as the level of liquid subcooling is increased. In the case of a wavy interface, the damping effect is predicted as considerably less pronounced.

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Section: Introductionmentioning

confidence: 99%

DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow

Апанасевич

Lucas

Sato

et al. 2022

Flow Turbulence Combust

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“…Chu et al (2000) obtained the interface condensation heat transfer coefficient (HTC) for countercurrent stratified smooth flow. Lee et al (2006) experimentally studied the interface condensation for stratified wavy flow by analyzing 105 local interface condensation HTCs. Štrubelj et al (2010) numerically modeled with threedimensional two-fluid models based on the condensationinduced water hammer experiments performed on the PMK-2 device.…”

Section: Introductionmentioning

confidence: 99%

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Sun

Zhang

et al. 2020

Front. Energy Res.

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Direct contact condensation (DCC) as a complex thermal-hydraulic phenomenon has been the subject of a great deal of research under forced flow conditions. It is an interesting challenge to study the phenomenon in a natural circulation system (NCS). In this paper, the flow behaviors along with DCC phenomena were experimentally investigated by a visualization method in an NCS at low pressure. Moreover, the influence of initial parameters including heat flux, inlet temperature and resistance of the heated section on the NCS was analyzed in detail. The experimental results revealed that two types of DCC phenomena were found in the NCS. When Type I DCC occurs, the interface wave will be formed due to the hydraulic jump caused by the reverse flow of subcooled water. The interface wave easily contributes to the occurrence of Type II DCC due to the Kelvin-Helmholtz instability. In addition, the NCS tends to be more unstable with the increase in the heat flux or the inlet resistance. The influence of inlet temperature on the flow rate should comprehensively consider the changes of outlet parameters and subcooled degree of the steam and the subcooled water.

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“…They found that the condensation heat transfer coefficient increased with the increase of steam flow rate and water flow rate. Chu et al [4] and Lee et al [5] investigated an interfacial heat transfer for counter-current steamewater stratified flow in a horizontal circular pipe for a smooth and wavy liquid flow, respectively. They investigated the parametric effects of the flow rates of steam and subcooled water and the degree of subcooling on the condensation heat transfer.…”

Section: Introductionmentioning

confidence: 99%

Quantitative observation of co-current stratified two-phase flow in a horizontal rectangular channel

Lee

Euh

Kim

et al. 2015

Nuclear Engineering and Technology

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Interfacial condensation for countercurrent steam–water stratified wavy flow in a horizontal circular pipe

Cited by 17 publications

References 8 publications

DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow

DNS and Highly-Resolved LES of Heat and Mass Transfer in Two-Phase Counter-Current Condensing Flow

Effects of Direct Contact Condensation on Flow Characteristics of Natural Circulation System at Low Pressure

Quantitative observation of co-current stratified two-phase flow in a horizontal rectangular channel

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