Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes

Yoon, Jung-In; Phan, Thanh Tong; Moon, Chang-Kwon; Lee, Ho-Saeng; Jeong, Seok–Kwon

doi:10.1007/s00231-007-0261-8

Cited by 38 publications

(12 citation statements)

References 5 publications

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“…The absorption rate of the conventional absorbers varies between 0.002 kg/m 2 s and 0.003 kg/m 2 s depending on the configurations and operating conditions [1][2][3][4][5][6][7][8]. Attempts have been made to enhance the absorption rate by modifying the configuration of horizontal tube absorbers.…”

Section: Introductionmentioning

confidence: 99%

Parametric study of water vapor absorption into a constrained thin film of lithium bromide solution

Chung

Moghaddam

2012

International Journal of Heat and Mass Transfer

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Section: Introductionmentioning

confidence: 99%

Parametric study of water vapor absorption into a constrained thin film of lithium bromide solution

Chung

Moghaddam

2012

International Journal of Heat and Mass Transfer

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“…Four tube rows, which are one below the other in the 12 parallel columns, form one pass, than there are 12 passes with 48 tubes each. The results showed than the overall heat transfer coefficient is function to row and tube number, however, an average value of this parameter was calculated to be 3000 W·m Yoon et al [19] evaluated a horizontal tube falling-film absorber with different diameter tubes, using water/lithium bromide mixtures. The test tubes were bare copper tubes.…”

Section: Falling Film Absorbersmentioning

confidence: 99%

Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review

Ibarra-Bahena

Romero

2014

Energies

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Abstract:The absorber is a major component of absorption cycle systems, and its performance directly impacts the overall size and energy supplies of these devices. Absorption cooling and heating cycles have different absorber design requirements: in absorption cooling systems, the absorber works close to ambient temperature, therefore, the mass transfer is the most important phenomenon in order to reduce the generator size; on the other hand, in heat transformer absorption systems, is important to recover the heat delivered by exothermic reactions produced in the absorber. In this paper a review of the main experimental results of different absorber designs reported in absorption heat pump cycles is presented.

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“…Roques and Thome [12] have experimentally investigated the effect of falling films on arrays of horizontal tubes and found that it is possible to design falling film evaporators using a fully incremental approach, where the local heat transfer coefficient depends on the local film Reynolds number of the liquid falling on the top of the tube. Heat transfer depends on film flow rate and Reynolds number, as Yoon et al [13] have found, where the heat transfer coefficient increases as flow rate and cooling water velocity increase. In this article, liquid film falling over horizontal plain cylinders using CFD code has been investigated.…”

Section: Introductionmentioning

confidence: 93%

Liquid Film Falling on Horizontal Plain Cylinders: Numerical Study of Heat Transfer in Unsaturated Porous Media

Jafar

Thorpe

Turan

2014

International Journal for Computational Methods in Engineering

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In this article, numerical investigation of liquid film falling over three horizontal plain cylinders is presented. The flow Reynolds number of 50 to 3000 and cylinder diameters of 0.022 m, 0.123 m, and 0.1 m are employed. Numerical predictions are obtained using FLUENT, a proprietary computational fluid dynamics (CFD) code for 2D configurations of the three cylinders. The mathematical approach is based on the volume of fluid (VOF) method to account for two fluid phases, namely air and water. The research reported in this paper is motivated by the possibility of using detailed numerical simulations of the phenomena that occur in beds of irrigated porous media to cool horticultural produce. The effect of liquid flow rate (Reynolds number) and the cylinder diameter on heat transfer coefficient have been studied. It is found that increasing liquid flow rate or Reynolds number results in an increase in the heat transfer coefficients, and decreasing the cylinder diameter results in an increase in the heat transfer coefficient. The numerical results provide an insight into the cooling mechanisms within beds of unsaturated porous media. This research is part of an overall study of horizontal cylinders falling film flow and heat transfer.

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Heat and mass transfer characteristics of a horizontal tube falling film absorber with small diameter tubes

Cited by 38 publications

References 5 publications

Parametric study of water vapor absorption into a constrained thin film of lithium bromide solution

Parametric study of water vapor absorption into a constrained thin film of lithium bromide solution

Performance of Different Experimental Absorber Designs in Absorption Heat Pump Cycle Technologies: A Review

Liquid Film Falling on Horizontal Plain Cylinders: Numerical Study of Heat Transfer in Unsaturated Porous Media

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