Experimental and computational investigation of vertical downflow condensation

Lee, Hyoungsoon; Kharangate, Chirag R.; Mascarenhas, Nikhin; Park, Ilchung; Mudawar, Issam

doi:10.1016/j.ijheatmasstransfer.2015.02.037

Cited by 134 publications

(50 citation statements)

References 76 publications

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“…It is concluded that the increase of air fraction from 0% to 4% deteriorates condensation heat transfer as high as 50% at low pressure. A recent report by Lee et al [20] examines condensation in downward flow through a circular tube both experimentally and computationally using FC-72 as a working fluid. Caruso and Maio [21] present an article on both theoretical and experimental investigation on steam condensation in the presence of noncondensable gases within horizontal and inclined tubes.…”

Section: Introductionmentioning

confidence: 99%

A study of mixed convection heat transfer with condensation from a parallel plate channel

Giri

Bhuyan

Das

2015

International Journal of Thermal Sciences

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Section: Introductionmentioning

confidence: 99%

A study of mixed convection heat transfer with condensation from a parallel plate channel

Giri

Bhuyan

Das

2015

International Journal of Thermal Sciences

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“…The same approach was also adopted in Bortolin et al [27], Kharangate et al [29], and Lee et al [16]. The basic equations for the continuity, momentum, energy, turbulence kinetic energy, and the specific dissipation rate are the same with those of single-phase flow as listed in Eq.…”

Section: Governing Equationsmentioning

confidence: 99%

“…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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“…To some extent, it impedes the prominent trends of miniaturization of electronic devices, which is essential for NEMS/MEMS. Although a few models had been proposed/implemented to enable the simulation of boiling in CFD code and obtains reasonable results [1][2][3], almost none of them has considered the complex interactions between micro structures and the surrounding fluid from the atomistic level, which are critical for bubble nucleation on solid surface.…”

Section: Background and Literature Reviewmentioning

confidence: 99%