CFD investigation on the flow structure inside thermo vapor compressor

Ji, Myoungkuk; Utomo, Tony Suryo; Woo, J. S.; Lee, Yong–Hun; Jeong, Hyomin; Chung, Hanshik

doi:10.1016/j.energy.2009.12.002

Cited by 86 publications

(13 citation statements)

References 12 publications

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“…Since the Reynolds number ranges from 3.038 × 10 5 to 1.044 × 10 6 in the calculations, a realizable -turbulence model [19][20][21][22][23] is employed to close the flow governing equations and describe the turbulent properties:…”

Section: Governingmentioning

confidence: 99%

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Zhu

Lin

Feng

et al. 2013

Advances in Mechanical Engineering

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In nitrogen drilling, entrained sand particles in the gas flow may cause erosive wear on metal surfaces and have a significant effect on the operational life of discharge pipelines, especially for elbows. In this paper, computational fluid dynamics (CFD) simulations based code FLUENT is carried out to investigate the flow erosion on a sand discharge pipe in conjunction with an erosion model. The motion of the continuum phase is captured based on solving the three-dimensional Reynolds-averaged Navier-Stokes (RANS) equations, while the kinematics and trajectory of the sand particles are evaluated by the discrete phase model (DPM). The flow field has been examined in terms of pressure, velocity, and erosion rate profiles along the flow path in the bend of the simulated discharge pipe. Effects of flow parameters such as inlet velocity, sandy volume fraction, and particle diameter and structure parameters such as pipe diameter and bend curvature are analyzed based on a series of numerical simulations. The results show that small pipe diameter or small bend curvature leads to serious erosion, while slow flow, little sandy volume fraction, and small particle diameter can weaken erosion. The results obtained from the present work provide useful guidance to practical operation and discharge pipe design.

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Section: Governingmentioning

confidence: 99%

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Zhu

Lin

Feng

et al. 2013

Advances in Mechanical Engineering

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“…Similar research was performed by [78,94] who varied the converging angle ϕ in the range 0-4.5 degrees in the context of desalination. Zhu et al [78] observed an increase of ω between 0 • and 2 • , and Ji et al [94] concluded that ω increases between 0 • to 1 • to a maximum value. Lin et al [79] also varied the angle ϕ corresponding to the inlet cone of the mixing chamber which seemed, however, to be of minor influence.…”

Section: The Mixing Chamber Inlet Anglementioning

confidence: 61%

“…A compromise is generally sought in terms the order of discretization and grid refinement [242]. Approaches such as grid adaptation which refine grids by zones adjusts the mesh only in the zones of important gradients, for example close to walls (Figure 21 and 22) or in zones of shear layer [28,88,92,165,238] or automatic adjustment dictated by specific criteria have been used [94,137,210,219,224].…”

Section: Computation and Discretization Schemesmentioning

confidence: 99%

“…Where possible, most ejector modeling has been validated by comparison with experiments focused on global data in terms of pressures, temperatures and flow rates [58,94,136,169,217,219,237,276,277] to name only a few. Several comparisons between simulation and experiments were performed and discrepancies were generally fair (5% to 15% approximately) for analytical modeling [59,70,278].…”

Section: Global Validationmentioning

confidence: 99%

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Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

et al. 2019

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Ejectors used in refrigeration systems as entrainment and compression components or expanders, alone or in combination with other equipment devices, have gained renewed interest from the scientific community as a means of low temperature heat recovery and more efficient energy use. This paper summarizes the main findings and trends, in the area of heat-driven ejectors and ejector-based machines, using low boiling point working fluids, which were reported in the literature for a number of promising applications. An overall view of such systems is provided by discussing the ejector physics principles, as well as a review of the main developments in ejectors over the last few years. Recent achievements on thermally activated ejectors for single-phase compressible fluids are the main focus in this part of the review. Aspects related to their design, operation, theoretical and experimental approaches employed, analysis of the complex interacting phenomena taking place within the device, and performance are highlighted. Conventional and improved ejector refrigeration cycles are discussed. Some cycles of interest employing ejectors alone or boosted combinations are presented and their potential applications are indicated.

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“…Liu [26] investigated the AR on the ejector efficiencies and established empirical correlations to predict ejector efficiencies. Liu and Ji [27,28] numerically investigated the flow characteristics inside the steam ejector, which could help to better understand the mechanism of steam ejector.…”

Section: Energies 2018 11 X For Peer Review 3 Of 13mentioning

confidence: 99%

Experimental Investigation of the Steam Ejector in a Single-Effect Thermal Vapor Compression Desalination System Driven by a Low-Temperature Heat Source

et al. 2018

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The paper presents an experimental investigation of a steam ejector in a single-effect thermal vapor compression (S-TVC) desalination system driven by a low-temperature (below 100 °C) heat source. To investigate the performance of the steam ejector in the S-TVC desalination system, an experimental steam ejector system was designed and built. The influences of the nozzle exit position (NXP), operating temperatures, and the area ratio of the ejector (AR) on the steam ejector performance were investigated at primary steam temperatures ranging from 40 °C to 70 °C, and at secondary steam temperatures ranging from 10 °C to 25 °C. The experimental results showed that the steam ejector can work well in the S-TVC desalination system driven by a low-temperature heat source below 100 °C. The steam ejector could achieve a higher coefficient of performance (COP) by decreasing the primary steam temperature, increasing the secondary steam temperature, and increasing the AR. The steam ejector could also be operated at a higher critical condensation temperature by increasing the primary steam temperature and secondary steam temperature, and decreasing the AR. This study will allow S-TVC desalination to compete with adsorption desalination (AD).

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CFD investigation on the flow structure inside thermo vapor compressor

Cited by 86 publications

References 12 publications

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Numerical Analysis of Flow Erosion on Sand Discharge Pipe in Nitrogen Drilling

Current Advances in Ejector Modeling, Experimentation and Applications for Refrigeration and Heat Pumps. Part 1: Single-Phase Ejectors

Experimental Investigation of the Steam Ejector in a Single-Effect Thermal Vapor Compression Desalination System Driven by a Low-Temperature Heat Source

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