Simulation of condensation flow in a rectangular microchannel

Chen, Sihan; Yang, Zhen; Duan, Yuan-Yuan; Chen, Ying; Wu, Di

doi:10.1016/j.cep.2013.12.004

Cited by 75 publications

(29 citation statements)

References 26 publications

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“…The two-phase frictional pressure drop and Nusselt number were validated with empirical correlations and a qualitative comparison of various flow patterns against experimental visualization data was conducted, acquiring a reasonable result. A simulation of condensation flow in a rectangular microchannel with the VOF method was also carried out by Chen et al [7]. A thermal equilibrium model assuming that the interface temperature is at saturation was combined with the present VOF model.…”

Section: Numerical Simulation Of Laminar Film Condensation In a Horizmentioning

confidence: 99%

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Numerical Simulation of Laminar Film Condensation in a Horizontal Minitube with and Without Non-Condensable Gas by the VOF Method

Yin

Guo

Sundén

et al. 2015

Numerical Heat Transfer, Part A: Applications

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Based on the volume of fluid (VOF) method, a steady three-dimensional numerical simulation of laminar film condensation of water vapor in a horizontal minitube, with and without non-condensable gas, has been conducted. A user-defined function defining the phase change is interpreted and the interface temperature is correspondingly assumed to be the saturation temperature. An annular flow pattern is to be expected according to a generally accepted flow regime map. The heat-transfer coefficient increases with higher saturation temperature and a smaller temperature difference between the saturation and wall temperatures, but varies little with different mass flux and degree of superheat. The existence of a non-condensable gas will lead to the generation of a gas layer between vapor and liquid, resulting in a lower mass-transfer rate near the interface and higher vapor quality at the outlet. In consequence, the heat-transfer coefficient of condensation with a non-condensable gas drops sharply compared with that of pure vapor condensation. Meanwhile, the non-condensable gas with a smaller thermal conductivity would cause a stronger negative effect on heat flux as a result of a higher thermal resistance of heat conduction in the non-condensable gas layer.

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Section: Numerical Simulation Of Laminar Film Condensation In a Horizmentioning

confidence: 99%

“…As the standard VOF method does not cover the phase change, researchers have explored different ways to determine the mass and heat transfers during condensation [6,7,12,13,[24][25][26][27][28]. Among these phase change models, a relatively simple and efficient method described below has been employed:…”

Section: Phase Change Modelmentioning

confidence: 99%

Numerical Simulation of Laminar Film Condensation in a Horizontal Minitube with and Without Non-Condensable Gas by the VOF Method

Yin

Guo

Sundén

et al. 2015

Numerical Heat Transfer, Part A: Applications

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“…Such as literature [12]- [14] using it to study boiling and literature [15] [16] using it to research condensation. In this paper, using commercial software Fluent 14.0, multiphase flow model chooses VOF model, calculating as follows within controlling cell.…”

Section: Numerical Methodologymentioning

confidence: 99%

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

Liu¹,

Huo²,

Liu³

et al. 2015

ENG

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Numerical simulation on R245fa condensation inside an inner diameter of 8 mm horizontal tube is researched in this paper. The effect of variation in velocity, condensation temperature and superheat of inlet steam and variation in cooling water temperature on heat transfer coefficient are investigated as a parametric study. Condensation process of steam has been successfully modeled by applying a user defined function (UDF) added to the commercial computational fluid dynamics (CFD) package. By analyzing the corresponding condensate contours and the curves of local heat transfer coefficient, the relationships between condensation heat transfer coefficient and various parameters of R245fa inside horizontal tube are obtained. It shows that the heat transfer coefficient increases by the increase in velocity, condensation temperature and superheat of inlet steam and the decrease in cooling water temperature. The errors between the heat transfer coefficient of simulation result and model of Wang and Shah are within ±30%. The parametric study will provide the basis for designing efficient heat exchangers of R245fa.

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“…3 and Eq.4 are based on the Lee [31] model which is widely adopted for condensation [16,17,[25][26][27][28][29] and evaporation [32,33] simulations.…”

Section: Governing Equationsmentioning

confidence: 99%

The effect of gravity on R410A condensing flow in horizontal circular tubes

Zhang

et al. 2017

Numerical Heat Transfer, Part A: Applications

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Heat transfer characteristics of R410A condensation in horizontal tubes with inner diameter of 3.78 mm under normal and reduced gravity are investigated numerically. The mass transfer model and numerical methods are validated by comparing the numerical heat transfer coefficients under normal gravity with the experimental work and empirical correlations. The results indicate that the heat transfer coefficients increase with increasing gravitational accelerations at a lower mass flux, while the difference of these under varing gravity is insignificant at a higher mass flux. The liquid film thickness decreases with increasing gravity at the top part of the tube at vapor quality x = 0.5 and 0.9, while the reverse is true for that at the tube bottom. The average liquid film thickness is nearly the same under different gravity accelerations at the same vapor quality and mass flux. The local heat transfer coefficients increase with increasing gravity at the top of the tube and decrease with increases in gravity at the bottom. The proportion of the thin liquid film region is important for the overall heat transfer coefficients for the condensing flow. A vortex with its core lying at the bottom of the tube is observed under normal gravity because of the combined effect of gravity and the mass sink at the liquid-vapor interface, while the stream traces point to the liquid-vapor interfaces under zero gravity. The mass transfer rate under zero gravity is much lower than that of normal gravity.

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Simulation of condensation flow in a rectangular microchannel

Cited by 75 publications

References 26 publications

Numerical Simulation of Laminar Film Condensation in a Horizontal Minitube with and Without Non-Condensable Gas by the VOF Method

Numerical Simulation of Laminar Film Condensation in a Horizontal Minitube with and Without Non-Condensable Gas by the VOF Method

Theoretical Research on R245fa Condensation Heat Transfer inside a Horizontal Tube

The effect of gravity on R410A condensing flow in horizontal circular tubes

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