Numerical study of heat and mass transfer of ammonia-water in falling film evaporator

Bu, Xianbiao; Ma, Weibin; Huang, Yuanfeng

doi:10.1007/s00231-011-0923-4

Cited by 8 publications

(3 citation statements)

References 26 publications

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“…There exist in general two approaches to treat numerically the heat and mass transfer associated with the evaporation of a liquid film in presence of a nonsaturated gas [18][19][20][21]. The first one considers an extremely thin layer of liquid.…”

Section: Overview Of Falling Film and Associated Heat And Mass Transf...mentioning

confidence: 99%

Liquid Film Evaporation: Review and Modeling

Orfi¹,

Mohamed²

2023

Humidity Sensors - Types and Applications

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Liquid film evaporation is encountered in various applications including in air humidifiers, in multiple effect distillers in thermal desalination, and in absorption cooling evaporators. It is associated with a falling pure, binary or multicomponent liquid film with associated complex and coupled heat and mass transfer processes. This chapter presents important fundamental aspects inherent to falling film evaporation in several geometrical configurations such as on horizontal tubes and inside inclined or vertical tubes or channels. The first part of the chapter concerns a review of recent works on this topic with emphasis on modeling and simulation features related to falling liquid films with heat and mass transfers. This document aims also to establish a frame for the modeling of the fluid flow with heat and mass transfer in the presence of evaporation. The main governing equations and the appropriate boundary and interfacial conditions corresponding to the fluid flow and associated heat and mass transfer and phase change are systematically presented and discussed for the case of falling film in a vertical channel with the presence of flowing gas mixture. Various simplifications of the governing equations and boundary and interfacial conditions have been proposed and justified. In particular, the formulation with extremely thin liquid film approximation is discussed.

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Section: Overview Of Falling Film and Associated Heat And Mass Transf...mentioning

confidence: 99%

Liquid Film Evaporation: Review and Modeling

Orfi¹,

Mohamed²

2023

Humidity Sensors - Types and Applications

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“…They help maintain better control of reaction conditions, improved security conditions, the gain in energy and reducing congestion (Hung et al 2013). The falling films are generally used as an intermediary for the transfer of heat and mass transfer (Zhang 2008;Bu et al 2011) in industrial equipment such as condensers and the evaporation towers (Marenzana et al 2004;Buonomo et al 2012). An extension of thermal quadrupole formalism is proposed for the modeling of heat conduction in heterogeneous environments, where the change in thermal properties is one-dimensional (Fudym 2002).…”

Section: Introductionmentioning

confidence: 99%

Falling Film in a Heated Micro-channel

Mejri¹,

Fudym²,

Sghaier³

et al. 2015

Applied Condition Monitoring

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Abstract. The main objective of this work is to study experimentally and numerically a falling film in a micro-channel. The experimental section involves in creating a temperature gradient within the liquid, while monitoring the temperature using an infrared camera. A numerical model is established and solved by a semianalytical method called the thermal quadrupole method. Finally, we conclude with a comparison between the experiments and the numerical study.

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“…the three-dimensional transient simulations of heat and mass transport processes associated with two-phase flows. Because of its large heat transfer efficiency, there has been particular scientific interest devoted to modeling the nucleate boiling process [30][31][32][33][34][35], including the analyses of flow structures [36] and the nonlinear dynamics of bubble growth [37][38][39].…”

Section: Introductionmentioning

confidence: 99%

A novel 1D/2D model for simulating conjugate heat transfer applied to flow boiling in tubes with external fins

2014

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This study presents a novel, simplified model for the time-efficient simulation of transient conjugate heat transfer in round tubes. The flow domain and the tube wall are modeled in 1D and 2D, respectively and empirical correlations are used to model the flow domain in 1D. The model is particularly useful when dealing with complex physics, such as flow boiling, which is the main focus of this study. The tube wall is assumed to have external fins. The flow is vertical upwards. Note that straightforward computational fluid dynamics (CFD) analysis of conjugate heat transfer in a system of tubes, leads to 3D modeling of fluid and solid domains. Because correlation is used and dimensionality reduced, the model is numerically more stable and computationally more time-efficient compared to the CFD approach. The benefit of the proposed approach is that it can be applied to large systems of tubes as encountered in many practical applications. The modeled equations are discretized in space using the finite volume method, with central differencing for the heat conduction equation in the solid domain, and upwind differencing of the convective term of the enthalpy transport equation in the flow domain. An explicit time discretization with forward differencing was applied to the enthalpy transport equation in the fluid domain. The conduction equation in the solid domain was time discretized using the CrankNicholson scheme. The model is applied in different boundary conditions and the predicted boiling patterns and temperature fields are discussed.

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Numerical study of heat and mass transfer of ammonia-water in falling film evaporator

Cited by 8 publications

References 26 publications

Liquid Film Evaporation: Review and Modeling

Liquid Film Evaporation: Review and Modeling

Falling Film in a Heated Micro-channel

A novel 1D/2D model for simulating conjugate heat transfer applied to flow boiling in tubes with external fins

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