Numerical study of falling film thickness over fully wetted horizontal round tube

Q, Qiu; Zhu, Xun; Mu, Lin; Shen, Shengqiang

doi:10.1016/j.ijheatmasstransfer.2015.01.024

Cited by 67 publications

(8 citation statements)

References 11 publications

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“…According to the findings of Qiu et al, 36 Zhao et al, 37 and Tahir et al, 38 surface tension, viscosity, flow rate, distributor height, and tube diameter all influence falling FT over horizontal tubes. The asymmetric spreading of liquid FT is noticed for different circumferential angles.…”

Section: Introductionmentioning

confidence: 94%

“…Furthermore, different experimental facilities have been utilized in the existing literature to find the liquid FT such as the optical-electronic method, 31 double fiber, optical probe, 32 laser-induced fluorescence technology, 33 laser confocal displacement meter, 34 and air-coupled ultrasonic transducer. 35 According to the findings of Qiu et al, 36 Zhao et al, 37 and Tahir et al, 38 surface tension, viscosity, flow rate, distributor height, and tube diameter all influence falling FT over horizontal tubes. The asymmetric spreading of liquid FT is noticed for different circumferential angles.…”

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confidence: 94%

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Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Kandukuri

Deshmukh

Katiresan

2022

Asia-Pacific J Chem Eng

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The intertube flow regimes and hydrodynamic behavior of the liquid profile have a significant impact on the functioning of falling-film evaporators. Column flow is one of the fundamental flow modes, which is actively observed in many industrial evaporators. A high-speed digital photographic device is utilized to visualize the complete progression of column flow phases for intertube distances of 10/20/30/40 mm and Reynolds number (Re) values ranging from 41 to 583. The Sobel edge detection algorithm is implemented to quantify the flow parameters for each frame of a sequence. The research results indicated that the column flow regime between the inline horizontal tubes can be broadly classified into the following phases: columnar droplet flow, periodic column flow, satellite drops column flow, drift column flow, and mixing liquid film column flow. The findings show that the liquid jet diameters between the tubes range from 1.6 to 8.46 mm, an increase in the liquid jet diameter with Re and a decrease with tube-to-tube distance. The axial coverage of the liquid film profile beneath the tube differed from 2.07 to 3.99 mm and over the tube surface ranged from 1.14 to 2.68 mm. The formation of dry spots and flooding is a major problem in the operation of falling-film heat exchangers. The shape and size of the liquid jet have a direct impact on the interfacial area; understanding the entire progression of column flow regimes, as well as their characteristics, can help designers avoid the aforementioned problem.

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Section: Introductionmentioning

confidence: 94%

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confidence: 94%

Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Kandukuri

Deshmukh

Katiresan

2022

Asia-Pacific J Chem Eng

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“…Additional information about the effects of these parameters on the optimal MEE-MVR system configuration and operational conditions are presented in Onishi et al 13 (2017a). Since horizontal-tube falling film arrangements presents higher heat transfer coefficients than vertical ones, these type of configuration exhibits reduced equipment size and, therefore, lower capital investment (Qiu et al, 2015).…”

Section: Superstructure and Process Descriptionmentioning

confidence: 99%

Process optimization for zero-liquid discharge desalination of shale gas flowback water under uncertainty

Onishi

Ruiz‐Femenia

Salcedo‐Díaz

et al. 2017

Journal of Cleaner Production

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Sustainable and efficient desalination is required to treat the large amounts of highsalinity flowback water from shale gas extraction. Nevertheless, uncertainty associated with well data (including water flowrates and salinities) strongly hampers the process design task. In this work, we introduce a new optimization model for the synthesis of zero-liquid discharge (ZLD) desalination systems under uncertainty. The desalination system is based on multiple-effect evaporation with mechanical vapor recompression (MEE-MVR). Our main objective is energy efficiency intensification through brine discharge reduction, while accounting for distinct water feeding scenarios. For this purpose, we consider the outflow brine salinity near to salt saturation condition as a design constraint to achieve ZLD operation. In this innovative approach, uncertain parameters are mathematically modelled as a set of correlated scenarios with known probability of occurrence. The scenarios set is described by a multivariate normal distribution generated via a sampling technique with symmetric correlation matrix. The stochastic multiscenario non-linear programming (NLP) model is implemented in GAMS, and optimized by the minimization of the expected total annualized cost. An illustrative case study is carried out to evaluate the capabilities of the proposed new approach. Cumulative probability curves are constructed to assess the financial risk related to uncertain space for different standard deviations of expected mean values. Sensitivity analysis is performed to appraise optimal system performance for distinct brine salinity conditions. This methodology represents a useful tool to support decision-makers towards the selection of more robust and reliable ZLD desalination systems for the treatment of shale gas flowback water.Keywords: Shale gas flowback water; Multiple-effect evaporation with mechanical vapor recompression (MEE-MVR); Zero-liquid discharge (ZLD); Uncertainty; Risk management; Robust design.3

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“…Qiu et al [10] analyzed the behavior of the film thickness in the falling film regime. Their investigation proved that the circumferential rate (the film thickness distribution in the circumferential direction of the tube) increases from 0 to 90 degrees, reaching the minimal values of the film thickness near 90 degrees.…”

Section: Analysis Of Film Thicknessmentioning

confidence: 99%

“…Therefore, Qiu et al [10] recommend a deeper insight into the distribution of film thickness which was required to promote the development of these systems.…”

Section: Introductionmentioning

confidence: 99%

Improved of effective wetting area and film thickness on a concentric helical bank of a generator for an absorption heat transformer

Lazcano-Véliz

Hernández

Juárez-Romero

et al. 2016

Applied Thermal Engineering

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Numerical study of falling film thickness over fully wetted horizontal round tube

Cited by 67 publications

References 11 publications

Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Characterization of column flow regimes on horizontal tubes for falling‐film systems: An experimental approach

Process optimization for zero-liquid discharge desalination of shale gas flowback water under uncertainty

Improved of effective wetting area and film thickness on a concentric helical bank of a generator for an absorption heat transformer

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