Experimental study of the flow characteristics in a falling film liquid desiccant dehumidifier

Luo, Yimo; Chen, Yi; Zhong, Dan; Wang, Yuanhao; Yang, Hongxing

doi:10.1080/23744731.2017.1251265

Cited by 5 publications

(5 citation statements)

References 24 publications

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“…Therefore, a correlation for the liquid oxygen under the range of Ka = 3532–6558 is fitted as shown in Equation . The exponent 0.904 of Ka is similar to 0.975 10 but bigger than 0.6 7–9,12 or 0.764 11 . It shows that Ka has a greater impact on the wettability of liquid oxygen, which is different from that of water.…”

Section: Resultsmentioning

confidence: 84%

“…Analogous to the first formula, the empirical correlation was put forward for the film flow of LiCl solution on the vertical plate. The discrepancies between the predictions and experimental data are within ±2% 12 . As seen, both the Kapitza number Ka and contact angle θ have a great impact on Re c .…”

Section: Introductionmentioning

confidence: 68%

“…A stagnant gas‐filled domain was created when the transient simulation started. Because the plate length is only 60 mm and the simulation Re is below 1600 in our study, hence, we can infer that the film surface is still smooth and locates in the laminar regime according to the results in previous works 12,47,49,50 . The PISO method was selected for the pressure–velocity coupling, and the PRESTO and the second‐order upwind were chosen for the pressure and momentum discretization.…”

Section: Problem Formulationmentioning

confidence: 75%

“…The letters “W” and “D” represent the wetting and dewetting processes. The first equation is the most classic correlation that is used to predict the critical Reynolds number ( Re c ), which was often cited in the references 9,11,12 . It was proposed based on the force balance at the upstream stagnation point of a dry‐patch.…”

Section: Introductionmentioning

confidence: 99%

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Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Wan

2021

Asia-Pacific J Chem Eng

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In this study, 2D and 3D models of corrugated plates using the volume of fluid (VOF) model were set up to simulate the influence of corrugated structure on the wettability and heat transfer. The results show that compared with the triangular corrugation, the rectangular corrugation has a slower growth rate of wetting ratio (WR) as the Weber number (We) increases under the same corrugation length Le and corrugation depth De. The average WR of the triangular corrugation is 2.8% less than that of the smooth plate. For the triangular corrugation, the higher Le contributes to improving wettability, but the average heat transfer coefficient havg first decreases to the minimum at Le = 5 mm and then increases 8% to 9% to a steady value until Le = 8 mm. WR decreases with De at We ≤ 0.76. A WR correlation considering the corrugation steepness St (St = De/Le) and a critical Re correlation corresponding to the minimum wetting rate were fitted for the liquid oxygen. As the inclination angle ϕ increases, the average film thickness decreases and havg increases until ϕ = 75°, while the variation rate slows down afterwards. At Re = 1200, havg has a decreasing trend at St ≤ 0.13, increases at St ≥ 0.14 and reaches a plateau after St = 0.24 as St increases. It increases by 30.6%, 47.4%, and 44.4% for the inclination angle ϕ = 30°, 60°, 90° cases from St = 0.14 to 0.24. The enhancement is caused by the vortices existing at St ≥ 0.14.

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Section: Resultsmentioning

confidence: 84%

Section: Introductionmentioning

confidence: 68%

Section: Problem Formulationmentioning

confidence: 75%

Section: Introductionmentioning

confidence: 99%

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Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Wan

2021

Asia-Pacific J Chem Eng

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“…For the vertical film flow, it is found that the film regime is laminar at Re ≤ 1600 [30]. Moreover, the film surface is smooth and laminar near the region of liquid inlet, which is defined as the wave inception [31,32]. Furthermore, we acquired the length of wave inception at Re = 1600, for the water was less than 20 cm (see Figure 3 in [32]).…”

Section: Assumptions and Mathematical Modelsmentioning

confidence: 99%

Falling Film Flow and Heat Transfer of Cryogenic Liquid Oxygen on Different Structural Surfaces

et al. 2022

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The accurate prediction of the falling film characteristics of cryogenic liquids is necessary to ensure good evaporation performance, due to their special physical properties. In this study, the film flow and heat transfer characteristics on four different structures were investigated, and the performance of the cryogenic liquid oxygen was compared with other fluids with higher temperatures, which demonstrates the influence of structures and liquid mediums. The VOF model was used to capture the film surface in the simulation model. The results show that for the four structures, liquids with higher kinematic viscosity tend to have greater film thickness, and the sensible heat transfer coefficients are inversely related to the nominal thermal resistance of falling film flow. Both on the smooth plate and the corrugated plate, the film wettability depends on the kinematic viscosity, rather than the dynamic viscosity, and the effect of kinematic viscosity is greater than that of surface tension. Both the local heat transfer coefficient and its fluctuation amplitude decrease gradually along the flow direction on the triangular corrugated plate, and the vortices are easier to produce at the wall troughs when the film viscosity is higher. At the bottom of the horizontal tube, the increases in local film thickness of the liquid oxygen are less than those of the water and the seawater. More liquid tends to accumulate at the bottom of the round tube, while it easily detaches from the film surface of the elliptical tube. For the horizontal tubes, the local heat transfer coefficients decrease rapidly when θ = 0–5°, and increase sharply at θ = 175–180°.

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Performance intensification of regeneration process for non-corrosive plastic plate vertical falling film tower

Kumar

Patil

Xiao

et al. 2019

Applied Thermal Engineering

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Experimental study of the flow characteristics in a falling film liquid desiccant dehumidifier

Cited by 5 publications

References 24 publications

Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Numerical study of the falling film wettability and heat transfer on the inclined plates with different corrugated structures

Falling Film Flow and Heat Transfer of Cryogenic Liquid Oxygen on Different Structural Surfaces

Performance intensification of regeneration process for non-corrosive plastic plate vertical falling film tower

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