Numerical simulations of nucleate boiling in impinging jets: Applications in power electronics cooling

Narumanchi, Sreekant; Troshko, Andrey; Bharathan, D.; Hassani, Vahab

doi:10.1016/j.ijheatmasstransfer.2007.05.026

Cited by 55 publications

(33 citation statements)

References 46 publications

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“…Of particular value is a paper by Narumanchi, Troshko, Bharathan and Hassani that includes a detailed discussion of the physics implemented in Fluent with the RPI-boiling model [7,8]. The RPI boiling model is based on the work of Podowski and others [9].…”

Section: Discussionmentioning

confidence: 99%

Two-phase computational fluid dynamics analysis of a hypervapotron heatsink for ITER first wall applications

Youchison¹,

Ulrickson²,

Bullock³

2009

2009 23rd IEEE/NPSS Symposium on Fusion Engineering

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Section: Discussionmentioning

confidence: 99%

Two-phase computational fluid dynamics analysis of a hypervapotron heatsink for ITER first wall applications

Youchison¹,

Ulrickson²,

Bullock³

2009

2009 23rd IEEE/NPSS Symposium on Fusion Engineering

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“…It can be estimated as t q = 0.8/f n [1]. The fraction of the wall area affected by nucleation is given as [4]:…”

Section: Mechanistic Boiling Modelmentioning

confidence: 99%

“…The bubble mean diameter D b has usually been modelled by either a constant, estimated value [8] or as a linear function of local sub-cooling ∆T sub = T sat − T l , [1,3,4] with adjustable reference bubble sizes and corresponding sub-cooling temperatures. As shown by [10], these simple approaches are very deficient when compared against the measured bubble size profiles.…”

Section: Mechanistic Boiling Modelmentioning

confidence: 99%

“…In the past, the majority of published CFD predictions of boiling flows employed the RPI model of Kurul and Podowski [1] for interfacial transfer closures. It was validated against high pressure flows but later some authors [3,4,5] adopted this model for low pressure boiling flows. Model improvements have been proposed by [6,7], while the model extension to conditions close to CHF was reported in [8].…”

Section: Introductionmentioning

confidence: 99%

“…In the majority of CFD simulations [3][4][5]9, 10] the boiling model has been coupled with multi-fluid conservation equations where individual velocity, temperature and other field variables can be solved for each phase. The exception is Bo's work [11], where the homogeneous multi-phase mixture (single fluid) approach was used in conjunction with the author's own mass transfer model.…”

Section: Introductionmentioning

confidence: 99%

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Multi-phase mixture modelling of nucleate boiling applied to engine coolant flows

Pržulj¹,

Shala²

2009

Computational Methods in Multiphase Flow V

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The paper reports on the use of the homogeneous multi-phase mixture modelling approach to simulate nucleate boiling in low pressure flows. A variant of the RPI (Rensselaer Polytechnic Institute) mechanistic nucleate boiling model provides closures for the wall thermal conditions and mass transfer rates due to phase change in the bulk flow. The bubble departure diameter at the wall and the bubble bulk diameter are identified as the most influential factors and their original model coefficients are modified.The numerical difficulties due to large density variations associated with phase change are successfully addressed in conjunction with the segregated pressure based SIMPLE (Semi-Implicit Method for Pressure Linked Equations) algorithm.The nucleate boiling model has been compared against published data from two experiments. The computed and measured values for the wall heat flux and vapour volume fractions are in broad agreement. The model capability is also demonstrated for the engine coolant flow where the conjugate heat transfer problem involving complex engine components is solved.

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Non‐Circular Hydraulic Jump on a Moving Surface due to an Impinging Circular Free Surface Jet of Water

Seraj

Gadala

2012

steel research int.

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Liquid jet impingement has many industrial cooling applications such as metal manufacturing and steel cooling on run‐out tables (ROT). The development of the wetting front around the impingement point of a jet is central in jet impingement cooling. In this paper, the effects of moving target surface and jet Reynolds number on wetted zone and on the formation and location of hydraulic jump (HJ) are explored through a series of industrial‐scale experiments of an impinging circular free surface long water jet with high Reynolds number of 11 000–50 000 and industrial jet parameters. The moving test surface impacts the radial evolution of circular wetted zone in all directions and alter the circular HJ at the wetting front into a non‐circular contour that depends on the jet Re number. The limited relations in the literature do not represent these measured shapes and do not appropriately predict radii of HJ in industrial scale. A new correlation for radius of non‐circular HJ has been derived in this study that compared more accurately to the experimental data. Numerical simulations of radial impingement flow on moving surface were performed using a variant of k–ε turbulent model and results are compared to the experimental data. The computational results for the wetting front were found to be close to the experimental data indicating the appropriate performance of the turbulent model.

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Numerical simulations of nucleate boiling in impinging jets: Applications in power electronics cooling

Cited by 55 publications

References 46 publications

Two-phase computational fluid dynamics analysis of a hypervapotron heatsink for ITER first wall applications

Two-phase computational fluid dynamics analysis of a hypervapotron heatsink for ITER first wall applications

Multi-phase mixture modelling of nucleate boiling applied to engine coolant flows

Non‐Circular Hydraulic Jump on a Moving Surface due to an Impinging Circular Free Surface Jet of Water

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