Computational and Experimental Investigation of using an Extractor in the Vertical Gravitational Flash Tank Separator

Mahmood, Raid Ahmed; Buttsworth, David; Malpress, Ray

doi:10.15282/ijame.16.2.2019.18.0505

Cited by 11 publications

(6 citation statements)

References 20 publications

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“…The no slip wall was applied for the wall boundary. Six cases were simulated for the same domain of the horizontal tube, each case corresponding to a particular mass flow rate that was used in the experiments [31]. Table 3…”

Section: Figure 4 Computational Domain Of the Horizontal Tube Geometrymentioning

confidence: 99%

CFD Numerical and Experimental Investigation of Two-Phase Flow Development After an Expansion Device in a Horizontal Pipe

Mahmood¹,

Buttsworth²,

Malpress³

et al. 2021

Journal of Thermal Engineering

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To optimize a vertical flash tank separator, the characteristics of the flow entering the separator are required to be known. A flash tank separator improves the performance of a refrigeration cycle by separating the liquid from liquid-gas flow and providing the evaporator with only liquid refrigerant. This technique improves the effective area and enhances the heat transfer coefficient in the evaporator. This paper investigates the influence of the inlet operating conditions to an expansion device, on the adiabatic two-phase flow development in a horizontal pipe downstream from the expansion device. This work also compares three dimensional numerical simulations and experimental observations for the two-phase flow development after the expansion device in the horizontal pipe. A general trend of the two-phase flow after the expansion device was gradually developed and the expansion length was identified at less than 200 mm from the inlet. The two-phase flow behaviour was recorded using a digital camera recording the flow behaviour at the upstream and downstream of the horizontal tube. The results revealed that an increase of the mass flow rate causes an increase in the void fraction and a reduction in the slip ratio in the developed region. The simulations underestimate the expansion length and the mean difference between the experimental data and the numerical results is 8 %.

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Section: Figure 4 Computational Domain Of the Horizontal Tube Geometrymentioning

confidence: 99%

CFD Numerical and Experimental Investigation of Two-Phase Flow Development After an Expansion Device in a Horizontal Pipe

Mahmood¹,

Buttsworth²,

Malpress³

et al. 2021

Journal of Thermal Engineering

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“…The coefficient of performance (COP) and energy consumption need more attention to provide high performance with low energy consumption of a vapour compression refrigeration system. The vapour injection technique using vertical gravitational flash tank separator was used to improve the COP [11,15,[35][36][37]. Winandy and Lebrun [38] reported that the vapour injection contributes to raise the compressor capacity with constant COP.…”

Section: Vapour Compression Cyclementioning

confidence: 99%

“…The vapour compression refrigeration system consists of four main components named: compressor, condenser, expansion device, and evaporator [2][3][4][5][6][7][8]. These components are connected in order to produce the refrigeration effect through thermodynamic processes: compression, condensation, expansion, and evaporation [9][10][11][12][13][14]. There are man thermodynamic losses associated with isentropic vapour compression and constant enthalpy expansion due to high discharge temperature of the refrigerant, large power consumptions, rise in the condenser heat rejection, large throttling losses and drop in refrigeration capacity.…”

Section: Introductionmentioning

confidence: 99%

Review of Mechanical Vapour Compression Refrigeration System Part 2: Performance Challenge

Mahmood

Ali

Al-Janabi

et al. 2021

International Journal of Applied Mechanics and Engineering

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Reducing energy consumption and providing high performance for a vapour compression refrigeration system are big challenges that need more attention and investigation. This paper provides an extensive review of experimental and theoretical studies to present the vapour compression refrigeration system and its modifications that can be used to improve system’s performance and reduce its energy consumption. This paper also presents the challenges that can be considered as a gab of research for the future works and investigations. Cooling capacity, refrigerant effect, energy consumption can be improved by using vapour injection technique, natural working fluid, and heat exchanger. Based on the outcome of this paper, vapour injection technique using natural refrigerant such as water can provide ultimate friendly refrigeration system. Future vision for the vapour compression refrigeration system and its new design technique using Computational Fluid Dynamic (CFD) is also considered and presented.

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“…Two-phase flow patterns represent the behavior of the two-phase flow and can be found in many forms which depend on the operating conditions. The two-phase flow pattern influences the performance of some industry devices such as vertical flash tank separators for the liquid separation [5], [6].…”

Section: Introductionmentioning

confidence: 99%

Experimental Comparison Between Wire Mesh and Electrical Capacitance Tomography Sensors to Predict a Two-Phase Flow Behaviour and Patterns in Inclined Pipe

Hameed¹,

Abdulkareem²,

Mahmood³

2021

Technium

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Two-phase flow behaviour and its flow patterns have a significant effect in many applications in industry. Oil-gas is one of the two-phase flow types that have many applications in petroleum and power stations. An oil-gas two-phase flow behaviour and flow patterns have been investigated in an inclined pipe using two different tomography sensors: Wire Mesh sensor (WMS) and Electrical Capacitance Tomography (ECT). A special experimental facility was designed and built to operate the tow-phase flow application in the inclined pipe with the various angle of inclination. A set of experimental data were collected using operating conditions which covered a two-phase flow range of superficial velocity of gas (Usl) from 0.05 to 0.52 m/s and superficial velocity of liquid (Usg) from 0.05 to 4.7 m/s at atmospheric pressure and room temperature. Three inclined angles to change the pipe’s inclination 45, 60, and 80-degree were applied in the experiments. The Comparison between the Wire Mesh Sensor (WMS) and Electrical Capacitance Tomography (ECT) was completed experimentally. The results revealed that there is a good agreement between the two sensors, however; the WMS had a higher frequency which was calculated 1000 frames per second compared with the ECT which worked at 200 frames per second.

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Computational and Experimental Investigation of using an Extractor in the Vertical Gravitational Flash Tank Separator

Cited by 11 publications

References 20 publications

CFD Numerical and Experimental Investigation of Two-Phase Flow Development After an Expansion Device in a Horizontal Pipe

CFD Numerical and Experimental Investigation of Two-Phase Flow Development After an Expansion Device in a Horizontal Pipe

Review of Mechanical Vapour Compression Refrigeration System Part 2: Performance Challenge

Experimental Comparison Between Wire Mesh and Electrical Capacitance Tomography Sensors to Predict a Two-Phase Flow Behaviour and Patterns in Inclined Pipe

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