Numerical Simulation of Boiling from a Single Reentrant-Cavity

Dietl, Jochen; Stephan, Peter

doi:10.1615/ihtc15.pbl.008590

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“…Herbert et al (2013) complemented this model by the capability to account for moving contact lines and validated the solver with experimental data of single drop impingement of FC-72 on a superheated wall. Dietl and Stephan utilized the solver to simulate pool boiling from single reentrant cavities Dietl and Stephan (2014). Rettenmaier et al complemented the model further by the ability to capture complex hydrodynamic behavior in the vicinity of the three-phase contact line (Rettenmaier (2019)) and enhanced the included capabilities of adaptive mesh refinement and load balancing to account for stable simulations with a high degree of parallelization (Rettenmaier et al (2019)).…”

Section: Introductionmentioning

confidence: 99%

Numerical Investigation of Successively Nucleating Bubbles During Subcooled Flow Boiling of FC-72 in Microgravity

Franz

Sielaff

Stephan

2021

Microgravity Sci. Technol.

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For the present study numerical simulations of subcooled flow boiling of FC-72 in microgravity have been conducted to accompany boiling experiments performed in microgravity on the International Space Station (ISS). The numerical domain represents the geometry of the experimental test cell. For all simulations the open source framework OpenFOAM was employed, including extensions to the interFoam solver, which have been developed at the authors’ institute. A reference case has been defined applying intermediate values from the experimental parameter range as system parameters. This case has been examined thoroughly with regards to hydrodynamic phenomena and heat transfer during multiple, successive bubble cycles. Based on this reference case, the system parameters flow velocity, input heat flux, pre-heating time, and subcooling of the liquid bulk have been varied, and the impact of these quantities on bubble growth and movement as well as heat transfer have been studied. It was found, that an increased flow rate as well as increased subcooling lead to smaller bubbles and increased time between subsequent nucleations. A high input heat flux, an increased pre-heating time, and a decreased subcooling lead to a rapid cycle of bubble nucleation and coalescence.

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Section: Introductionmentioning

confidence: 99%