Thermo-hydrodynamic modeling of flow boiling through the horizontal tube using Eulerian two-fluid modeling approach

Pal, Ram Kumar; K, Ravi Kumar

doi:10.1016/j.ijheatmasstransfer.2020.120794

Cited by 20 publications

(2 citation statements)

References 37 publications

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“…Finally, it appears here that the solid temperature difference in a cross-section of the flow was strongly correlated with the flow regime itself. Such analysis is consistent with the solid temperature field presented by [36]. This turned out to be an experimental advantage, as the measurement of the volume fraction was much more complex than that of the temperature.…”

Section: Thermal Considerationssupporting

confidence: 85%

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

2023

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A numerical approach was implemented, to study a boiling flow in a horizontal serpentine tube. A NEPTUNE_CFD two-fluid model was used, to study the behavior of the refrigerant R141b in diabatic cases. The model was based on the Euler–Euler formalism of the Navier–Stokes equations, in which governing equations are solved for both phases of the fluid at each time step. The conjugate heat transfer—between the tube wall and the fluid—was considered via a coupling with the SYRTHES 4.3 software, which solves solid conduction in three dimensions. A mesh convergence study was carried out, which found that a resolution of 40 meshes per diameter was necessary for our case. The approach was validated by comparison with an experimental study of the literature, based on the faithful reproduction of the positions of two-phase flow regime transitions in the domain. Original post-processing was used, to unravel the flow characteristics. The mean and RMS fields of void fraction, temperatures and stream wise velocities in several sections were analyzed, when statistical convergence was reached. A thermal equilibrium was reached in the saturated liquid, but not in the vapor phase, due to the flow dynamic and possibly the presence of droplets. Finally, a thermal analysis of the configuration was proposed. It demonstrated the strong coupling between the temperature distribution in the solid, and the two-phase flow regimes at stake in the fluid domain.

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Section: Thermal Considerationssupporting

confidence: 85%

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

2023

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“…The homogeneous equilibrium model (HEM) approach is widely used in most of the reported thermalhydraulic studies [5,22]. The accuracy of HEM model is limited as it is modeled theoretically as single phase considering the average properties of all the phases and many flow behaviors could not be analyzed.…”

Section: Introductionmentioning

confidence: 99%

Effect of position of heat flux profile on the absorber surface of parabolic trough solar collector for direct steam generation

Pal

Kumar

2022

Journal of Energy Systems

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The overall performance of parabolic trough solar collector (PTSC) based power plants could be improved by introducing the Direct steam generation (DSG) in the receiver of the solar collector. However, the thermalhydraulic instability induced in the DSG process is a severe issue for the commercial application of the technology. The concentrated solar flux falling on the dry portion of the absorber before or after solar noon generates a high circumferential thermal gradient in the stratified flow region. In this work, numerical analysis of thermo-hydrodynamics of DSG has been performed to study the effect of position of solar flux profile using CFD solver ANSYS Fluent 2020R1. The TPF in the solar collectors is modeled through two-fluid modeling approach. The inlet mass flow rate and operating pressure for PTSC are considered as 0.6 kg/s, and 100 bar, respectively. The solar beam radiations are considered as 750 W/m2 and 1000 W/m2. The obtained results revealed that temperature distribution at the absorber outer surface varies in the range of 585 K to 643 K. The maximum circumferential temperature difference is observed as 55.5 K. The volume fraction of vapor at the absorber outlet are found as 0.31 and 0.37 respectively for DNI 750 W/m2 and 1000 W/m2. The corresponding pressure losses are 316 Pa and 350 Pa, respectively. The obtained results could be employed to characterize the thermal behavior of the DSG solar collectors. The model is useful to configure the solar field operation for optimum performance.

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Investigation of a Buoyant Bubble Motion in a Wall-Driven Square Cavity

Afass,

Bergadà,

Derfoufi

et al. 2023

Lecture Notes in Mechanical Engineering

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Thermo-hydrodynamic modeling of flow boiling through the horizontal tube using Eulerian two-fluid modeling approach

Cited by 20 publications

References 37 publications

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

Euler–Euler Multi-Scale Simulations of Internal Boiling Flow with Conjugated Heat Transfer

Effect of position of heat flux profile on the absorber surface of parabolic trough solar collector for direct steam generation

Investigation of a Buoyant Bubble Motion in a Wall-Driven Square Cavity

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