Parametric study of two-phase flow in a porous wick of a mechanically pumped loop heat pipe

Ali, Shujan; Pandey, Nishan; Hadj-Nacer, Mustafa; Greiner, Miles; Riyad, M. Faisal

doi:10.1063/5.0037715

Cited by 4 publications

(3 citation statements)

References 4 publications

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“…To estimate the source term, Darcy’s law and Forchheimer’s law , can be employed. The porous media model is particularly useful for simulating multiphase flow systems with intricate internals, such as reactors with biomass particles, nuclear reactors with bundles, and heat pipes with wicks . This model allows for an efficient representation of the flow behavior through the porous medium while considering the effects of the internal structures.…”

Section: Cfd Approaches For Phase Change Simulationmentioning

confidence: 99%

“…There are many advantages to heat pipes, including their flexibility, simplicity, long working life, and maintenance-free. Several industrial applications have benefited from these heat pipe techniques, including renewable energy, waste heat recovery, heat exchangers, electronics, space missions, , electric vehicles, and buildings . As a result, many different types of heat pipes have been developed to meet the needs of different application occasions, including thermosyphons, separate heat pipes, pulsating heat pipes, loop heat pipes, etc.…”

Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

“…It was found that the increased mass flow rate can intensify the turbulence, which can further reduce the wick temperature and the nucleation site density. Ali et al 77 found that a higher liquid flow rate could lead to higher boiling limits and lower operation temperature, which is beneficial to the mechanically pumped loop heat pipe. However, the pressure drop also increased obviously in this case.…”

Section: Reactor Cooling Crises Under Emergency Conditionsmentioning

confidence: 99%

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Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Phase change is a phenomenon that has been extensively utilized in chemical engineering, energy, electronics, vehicle, and space exploration. From both the science and engineering perspectives, gaining a profound understanding of the intricacies of multiphase flow processes accompanied by heat and mass transfer due to phase change is of fundamental importance. Indeed, the computational fluid dynamics (CFD) has been increasingly applied as an effective tool to give an in-depth and efficient analysis of the phase change processes, thereby enhancing our understanding and capacity to control and optimize the phase change effects in these processes. This paper seeks to provide a comprehensive review of the utilization of CFD methodologies in the simulations of phase change flows across various applications, including temperature management, drying, separation and purification, and others. First, the CFD models at various scales that are developed to elucidate the phase change processes are summarized. Second, the noteworthy advances in the recent CFD simulation work on various phase change processes are presented, respectively. Finally, the challenges and potential prospects to facilitate the application of the phase change flow are discussed. The current review aims to offer insightful guidance for the CFD modeling of phase change processes in numerous engineering application scenarios.

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Section: Cfd Approaches For Phase Change Simulationmentioning

confidence: 99%

Section: Phase Change For Thermal Management (Tm)mentioning

confidence: 99%

Section: Reactor Cooling Crises Under Emergency Conditionsmentioning

confidence: 99%

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Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Zhu

Zhang

et al. 2023

Ind. Eng. Chem. Res.

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Flow Characterization in Triply Periodic Minimal Surface (TPMS)-Based Porous Geometries: Part 1—Hydrodynamics

et al. 2022

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Swirl Brake Design for Improved Rotordynamic Vibration Stability Based on Computational Fluid Dynamics System Level Modeling

Ali

Mortazavi²,

Palazzolo

2023

ASME Open Journal of Engineering

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The accurate characterization of compressor rotordynamic coefficients during the design phase reduces the risk of subsynchronous vibration problems occurring in the field. Although rotordynamists extensively investigate discrete compressor components (such as seals and front shrouds) to tackle instability issues, integrated or system-level analysis of compressor rotordynamics is very sparse. In reality, the impeller, eye-labyrinth seal, and the front shroud heavily influence one another; and the collective dynamic behavior of the system differs from the sum of the dynamic behavior of isolated components. A computational fluid dynamics (CFD)-based approach is taken to evaluate the dynamic behavior of the system as a whole. The geometry and operating conditions in this work are based on the recent experimental study of Song et al. (2019, “Non-Axisymmetric Flows and Rotordynamic Forces in an Eccentric Shrouded Centrifugal Compressor—Part 1: Measurement,” ASME J. Eng. Gas Turbines Power, 141(11), p. 111014. 10.1115/1.4044874) on centrifugal compressor. The commercial CFD code cfx 19.0 is used to resolve Reynolds-averaged Navier–Stokes equations to quantify the eye-labyrinth seal and front cavity stiffness, damping, and added mass. The entire compressor stage is modeled to uncover the coupled behavior of the components and assess the stability of the whole system instead of just discrete components. In the current work, three CFD approaches, namely quasi-steady, transient static eccentricity, and transient mesh deformation techniques are studied and benchmarked against analytical and experimental results from the literature. Having established the efficacy of the proposed approach, four types of swirl brakes are proposed and analyzed for stability. The novel swirl brakes create negative swirls at the brake cavities and stabilize both the front shroud and the eye-labyrinth seal simultaneously.

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Parametric study of two-phase flow in a porous wick of a mechanically pumped loop heat pipe

Cited by 4 publications

References 4 publications

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Recent Advances in CFD Simulations of Multiphase Flow Processes with Phase Change

Flow Characterization in Triply Periodic Minimal Surface (TPMS)-Based Porous Geometries: Part 1—Hydrodynamics

Swirl Brake Design for Improved Rotordynamic Vibration Stability Based on Computational Fluid Dynamics System Level Modeling

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