Fixed grid numerical modelling of frost growth and densification

Bartrons, Eduard; Galione, Pedro; Segarra, Carlos David Pérez

doi:10.1016/j.ijheatmasstransfer.2018.10.080

Cited by 18 publications

(8 citation statements)

References 32 publications

(51 reference statements)

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“…We assume incompressibility of humid air and neglect the term having time derivative of density [29]. The deposited frost has zero velocity.…”

Section: Governing Equations Of Conservationmentioning

confidence: 99%

“…C 0 is an arbitrary constant which is set to 1.5E6 [29] in this work and 0 is set to a small value (such as 1E-12) to avoid division by zero in the case of α ice = 1. If a given control volume has no ice (α ice = 0), the coefficient K d takes a value of zero.…”

Section: Governing Equations Of Conservationmentioning

confidence: 99%

“…Hence, in the regions with frost, the velocity of humid air drops corresponding to the porosity. Similar approach is used by several researchers to model phase change systems [24,27,29].…”

Section: Governing Equations Of Conservationmentioning

confidence: 99%

“…Hence, in this work, we have developed an approach based on mixture model which uses a single set of conservation equations with a volume fraction to distinguish between the phases. Mixture model has been used extensively in the study of phase change systems [24][25][26][27][28][29]. Recently, Bartrons et al [29] used a mixture model with frost as a porous structure to analyze frost growth over a flat plate in two dimensions with a two step predictor-corrector approach.…”

Section: Introductionmentioning

confidence: 99%

“…Mixture model has been used extensively in the study of phase change systems [24][25][26][27][28][29]. Recently, Bartrons et al [29] used a mixture model with frost as a porous structure to analyze frost growth over a flat plate in two dimensions with a two step predictor-corrector approach. We use the semi-implicit pressure splitting method to solve the momentum equations coupled with mass conservation of water and energy equations.…”

Section: Introductionmentioning

confidence: 99%

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Numerical Simulations of Frost Growth Using Mixture Model on Surfaces with Different Wettability

Shahane¹,

Shen²,

Wang³

2021

Preprint

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Frost growth on cold surfaces is a transient process with coupled heat and mass transfer. Due to multiple factors such as humidity, temperature, flow velocity and constantly changing thermal properties as frost grows, precise prediction can be challenging. Especially when the geometry of the frosting surfaces gets complicated, it requires a balance of computing accuracy and efficiency. In this work, a numerical model is developed to predict frost growth considering the effect of the above parameters. Mixture model is adapted to improve the computational efficiency and the unstructured grids add the flexibility to extend the model to complex geometries. The predicted frost growth rate matches well with the experimental data reported in the literature under similar conditions. The model predicts reasonable growth trend of frost as the surface temperature, air temperature, humidity and flow velocity vary. The surface wettability effect is well captured at the early stage of frosting and it shows a higher frost growth rate on surfaces with a higher wettability.

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“…We assume incompressibility of humid air and neglect the term having time derivative of density [29]. The deposited frost has zero velocity.…”

Section: Governing Equations Of Conservationmentioning

confidence: 99%

Section: Governing Equations Of Conservationmentioning

confidence: 99%

“…Hence, in the regions with frost, the velocity of humid air drops corresponding to the porosity. Similar approach is used by several researchers to model phase change systems [24,27,29].…”

Section: Governing Equations Of Conservationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

Numerical Simulations of Frost Growth Using Mixture Model on Surfaces with Different Wettability

Shahane¹,

Shen²,

Wang³

2021

Preprint

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Evaporation of anhydrous ammonia from small concrete coupons and implications regarding evaporation from a large accidental spill on concrete

Languirand,

Phung,

Hanna

et al. 2023

Process Safety Progress

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Anhydrous ammonia is transported via ship, rail, and road everyday in the United States as a refrigerated liquid at ambient pressure. As a result, unintential release of a large amount of anhydrous ammonia could result from an accident during transportation. The aim of this paper is to provide a better understanding of the evaporation of anhydrous ammonia from porous media. In our investigation, laboratory‐scale concrete coupons were used as a surrogate for a larger concrete pad that could be present in an event involving an unintentional release of liquid anhydrous ammonia. Concrete coupons sized 5 cm × 5 cm × 1.9 cm were saturated in liquid anhydrous ammonia, and measurements of the subsequent evaporation from the coupons were made in an environmental chamber. The ambient air temperature within the chamber varied from 5 to 45°C, and the relative humidity varied from 5% to 75%. Mass‐difference calculation and Berthelot's reaction were used to determine the average evaporation rate from a concrete coupon across all trials, which was found to be 6.5 ± 1.9 mg/s. To validate these evaporation rates, the remaining ammonia in the concrete coupon was measured for each trial. We found that the time‐integrated calculated evaporation rates correlated well with the total mass of ammonia that was lost from the coupons. In addition, it was found that ambient air temperature and relative humidity had little influence on anhydrous ammonia evaporation from the concrete coupons.

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Frost prediction based on a 3D CFD model of heat and mass transfer in a counter-cross-flow parallel-plate liquid-to-air membrane energy exchanger

Alipour Shotlou,

Pourmahmoud

2023

Build. Simul.

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Fixed grid numerical modelling of frost growth and densification

Abstract: Portal del coneixement obert de la UPC http://upcommons.upc.edu/e-prints Aquesta és una còpia de la versió author's final draft d'un article publicat a la revista International Journal of Heat and Mass Transfer.

Cited by 18 publications

References 32 publications

Numerical Simulations of Frost Growth Using Mixture Model on Surfaces with Different Wettability

Numerical Simulations of Frost Growth Using Mixture Model on Surfaces with Different Wettability

Evaporation of anhydrous ammonia from small concrete coupons and implications regarding evaporation from a large accidental spill on concrete

Frost prediction based on a 3D CFD model of heat and mass transfer in a counter-cross-flow parallel-plate liquid-to-air membrane energy exchanger

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