CFD simulation of adiabatic water vapor absorption in large drops of water–LiBr solution

Hosseinnia, Seyed Mojtaba; Naghashzadegan, Mohammad; Kouhikamali, R.

doi:10.1016/j.applthermaleng.2016.03.144

Cited by 10 publications

(7 citation statements)

References 30 publications

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“…The literature shows that the CFD modelling of absorbers in VARS has been developed using two multiphase models: Volume of Fluid (VOF) (Asfand et al, 2015;Hosseinnia et al, 2016) and Mixture (Panda and Mani, 2016). Therefore, both multiphase models were used in both the base and optimized CFD models.…”

Section: Vof and Mixture Models Resultsmentioning

confidence: 99%

“…Given the complexity of modelling heat and mass transfer processes in absorbers or generators used in VARs, the open literature discussing the use of CFD to model these components is limited. The CFD modelling was used to assess a membrane-based absorber using H2O/LiBr (Asfand et al, 2015), also H2O/(LiBr + LiI + LiNO3 + LiCl) and H2O/(LiNO3 + KNO3 + NaNO3) (Asfand et al, 2016), a falling film absorber using H2O/LiBr (Hosseinnia et al, 2016(Hosseinnia et al, , 2017, a bubble absorber using R134a-DMF (Panda and Mani, 2016), a plate bubble absorber using NH3/H2O (Lima et al, 2019), and a first approach of the absorption using NH3/LiNO3 (Zapata et al, 2021). Moreover, Asfand et al (2015) reported a CFD model to analyse the local heat and mass transfer mechanisms in an H2O/LiBr membrane-based absorber.…”

Section: Introductionmentioning

confidence: 99%

“…Results show that contrasted to a vertical nozzle with no swirl, the mass transfer coefficient increased between 120% and 170%, while the heat transfer coefficient increased from 20% to 40% in swirl flow. Hosseinnia et al (2016Hosseinnia et al ( , 2017 modelled the drop and jet flows of a falling film of H2O/LiBr on tubes. The phases interface was modelled with the volume of fluid model (VOF).…”

Section: Introductionmentioning

confidence: 99%

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Vapour Absorption Process in an Nh3/Lino3 Bubble Absorber Using an Optimized CFD Model

Amaris¹,

Zapata²,

Gutiérrez³

et al. 2022

Front. Heat Mass Transf.

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The present study aims to assess the vapour bubble absorption into the ammonia/lithium nitrate (NH3/LiNO3) solution by using an optimized CFD model. A detailed methodology to build up the CFD model is presented, as well as its validation using experimental data. The operating conditions set corresponds to an absorption chiller driven by low-temperature heat sources such as solar energy in warm environments. Results evidenced that the Volume of Fluid and Mixture models are adequate to be used in the CFD model to predict the absorption process in the bubble absorber assessed depending on the mesh density refinement. Moreover, the heat transfer coefficient from the solution side and the absorption mass flux are the variables needed for reliable validation of the model. Finally, the absorbed flux estimated from the CFD model ranged between 3.2×10 -3 kg.m −2 .s −1 and 4.4×10 -3 kg.m −2 .s −1 , while the solution side heat transfer coefficient varied between 457 W.m −2 .K −1 and 786 W.m −2 .K −1 , under the conditions considered.

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Section: Vof and Mixture Models Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Vapour Absorption Process in an Nh3/Lino3 Bubble Absorber Using an Optimized CFD Model

Amaris¹,

Zapata²,

Gutiérrez³

et al. 2022

Front. Heat Mass Transf.

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“…The present analysis focuses on an absorptive liquid film flowing over a vertical row of horizontal smooth tubes. Droplet impact and hydrodynamic boundary layer development (19)(20)(21)(22)(23)(24)(25)30) are not discussed herein. In order to reach a closed analytical solution of the governing transport equations, heat and mass transfer processes are considered under the following main assumptions:…”

Section: Physical Modelmentioning

confidence: 99%

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Giannetti

Rocchetti

Yamaguchi

et al. 2018

International Journal of Thermal Sciences

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“…The absorber has a direct impact on the system size and performance, and the performance improvement of the entire system can be attained by improving its performance. Hosseinnia et al [5] analyzed the vapor absorption rate inside free-falling droplets with a diameter of 4.4 mm in an adiabatic absorber and found that the operating pressure of the absorber is an important variable for the amount of supercooling according to the operating temperature and concentration. Asfand et al [6] examined the absorption rate according to the solution inflow rate by performing computational fluid dynamics (CFD) simulations.…”

Section: Introductionmentioning

confidence: 99%

Experimental Investigation of the Heat Transfer Characteristics of Plate Heat Exchangers Using LiBr/Water as Working Fluid

et al. 2021

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In this study, the heat exchange characteristics of water–LiBr solutions used as working fluid in a plate heat exchanger (PHE) were experimentally investigated at various concentrations. To analyze the heat transfer characteristics under LiBr/water conditions, a brazing type plate heat exchanger was installed, and the LiBr concentration on the high-temperature side was controlled at 56%, 58%, 60% and 60%. The results showed that the average heat transfer rate under water/water conditions was higher than that under LiBr/water conditions and the average heat transfer rate decreased as the LiBr concentration on the hot side increased. In addition, under both water/water and LiBr/water conditions, the average heat transfer rate and overall heat transfer coefficient increased as the mass flow rate of the working fluid on the hot side increased. When LiBr was used, the Reynolds number (Re) of LiBr on the hot side was more than nine times lower than that of water at the same mass flow rate owing to the influence of the increased viscosity. Based on the data obtained from the water/water and LiBr/water experiments, a correlation for predicting the Nusselt number (Nu) on the hot side in a wide range was developed.

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CFD simulation of adiabatic water vapor absorption in large drops of water–LiBr solution

Cited by 10 publications

References 30 publications

Vapour Absorption Process in an Nh3/Lino3 Bubble Absorber Using an Optimized CFD Model

Vapour Absorption Process in an Nh3/Lino3 Bubble Absorber Using an Optimized CFD Model

Heat and mass transfer coefficients of falling-film absorption on a partially wetted horizontal tube

Experimental Investigation of the Heat Transfer Characteristics of Plate Heat Exchangers Using LiBr/Water as Working Fluid

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