Direct contact evaporation heat transfer coefficient and drobble size distribution in a 2D column

Fu, Hailing; Huang, Qunwu; Cui, Yong; Sun, Yong; Jiang, Lihong

doi:10.1016/j.applthermaleng.2015.11.109

Cited by 15 publications

(1 citation statement)

References 32 publications

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“…In addition to this, a number of intrinsic nonlinear phenomena, including rapid phase changes and turbulent, are also the influencing factors. 30,31 Therefore, if the shape and location of the bubbles inside DCHE are investigated rather than counting computation, monitoring the mixing process will be more consummate. 32…”

Section: Introductionmentioning

confidence: 99%

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

Xiao

Luo

Huang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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By bringing two immiscible fluids at different temperatures into a direct contact heat exchanger (DCHE), bubble swarms are produced in the dual-loop ORC direct contact boiling heat transfer process. The aim of this paper is to make effort to explore the interplay between mixing state quality and heat transfer performance of fluids in the DCHE. Through flow visualization of this mixing process, a simple image analysis technique is introduced to represent the formation and evolution of vapor around the injected coolant droplets. Description of the boiling heat transfer process is here achieved by average volumetric heat transfer coefficient (VHTC). Experimental results attest that the proposed mixing index is powerful and sufficient compared with the Betti numbers method for the mixing quality quantification of bubbles inside DCHE. The synergistic association between the fluids mixing process and the heat transfer process is investigated by statistical regression model of new mixing index and VHTC. The contributions, including the data from monitoring practice in ORC heat transfer system and the proposed way, are presented to delve into the transient behaviors comparison of various fluids mixing and heat transfer processes conveniently.

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Section: Introductionmentioning

confidence: 99%

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

Xiao

Luo

Huang

et al. 2020

Proceedings of the Institution of Mechanical Engineers, Part C:

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The effect of packing on direct contact evaporation in spray column

Jin

Huang

et al. 2017

Can J Chem Eng

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The direct contact evaporation in countercurrent spray column has been experimentally investigated. Two kinds of random packing were added into the column independently to study their influence on heat transfer process. Three different continuous phase flow rates (150, 200, 250 L/h) and two different dispersed flow rates (6.565, 13.13 L/h) were used in the experiment. The inlet continuous phase temperature ranged from 42 to 57 °C, and the inlet dispersed phase temperature was near its boiling point. The effect of variable factors on the optimal column height, the volumetric heat transfer coefficient, the pressure drop, and the thickness of foam layer were studied. The results showed that packing had positive effects on heat transfer, such as decreasing the optimal column height and the thickness of foam layer, increasing heat transfer coefficient. But extra pressure was also obvious. Dixon rings performed better than Raschig rings in the experiments due to their finer structure.

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Experimental investigation on fluid flow and heat transfer characteristics of a submerged combustion vaporizer

Han

Ren

Wang

et al. 2017

Applied Thermal Engineering

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Direct contact evaporation heat transfer coefficient and drobble size distribution in a 2D column

Cited by 15 publications

References 32 publications

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

Interplay of fluids mixing and heat transfer in a dual-loop ORC direct contact heat exchanger used for waste heat utilization

The effect of packing on direct contact evaporation in spray column

Experimental investigation on fluid flow and heat transfer characteristics of a submerged combustion vaporizer

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