Numerical assessment of steam ejector efficiencies using CFD

Varga, Szabolcs; Oliveira, Armando C.; Diaconu, Bogdan

doi:10.1016/j.ijrefrig.2009.01.007

Cited by 153 publications

(79 citation statements)

References 37 publications

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“…The most proper model should be selected against the flow physics, accuracy requirement, computing resources and simulation time. Since the RC DTH hammer drill bit was design with multiple ejectors, it is worthwhile to refer to the previous CFD simulations of ejector flow fields [18][19][20][21][22][23] before selecting the turbulence model. After long deliberation, the author selected the realisable k-ε model for the simulation.…”

Section: Solver Settingsmentioning

confidence: 99%

Effect of suction nozzle structure on reverse circulation performance of down-the-hole hammer drill bit

Zhao¹,

Li²,

Yin³

et al. 2017

IJHT

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This paper aims to disclose the effect of suction nozzle structure on the RC suction capacity of DTH drill bit. For this purpose, three different types of suction nozzles were developed for the DTH drill bit. Then, the CFD software was adopted to simulate the fluid movement in a hole and the DTH drill bit. The results show that type three ranked first in terms of RC suction capacity, while type two came at the bottom. Then, the entrainment ratio was introduced to quantify the RC capacity. The results show that the RC capacity of type three is about 6 times of that of the other two types of nozzles. Our research opens up a new direction for future engineering practices.

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Section: Solver Settingsmentioning

confidence: 99%

Effect of suction nozzle structure on reverse circulation performance of down-the-hole hammer drill bit

Zhao¹,

Li²,

Yin³

et al. 2017

IJHT

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“…The additional liquid line (9) circulates the liquid from the separator (6) and moves it through the pump (10), and continues back to the ejector (4). The evaporator (2) absorbs heat from the source (11), and the condenser (5) is connected to the heat sink (12) [3].…”

Section: Application Of Condensing Ejectormentioning

confidence: 99%

“…Analytical models have been made to better describe the experimental results. In the past few decades, CFD has been used to describe two-phase flow through nozzles, with some work particularly looking at the condensing ejector [8][9][10][11][12][13][14].…”

Section: Early Experimental Work On Condensing Ejectorsmentioning

confidence: 99%

“…More recently (within the last decade), CFD simulations looking at flow (both single-phase and two-phase) through an ejector have become more complex in the aspect of modeling [9][10][11][12][13]. More sophisticated turbulence models have been used to better predict the flow and compressibility effects have been added too.…”

Section: Ejector Flow Studies Using Cfdmentioning

confidence: 99%

“…Rusly et al [10] primarily focused on the effects of using different nozzle geometries. The authors used a combined ejector-vapor compression system, which contains an ejector sub-cycle and a vapor-compression sub-cycle.…”

Section: Ejector Flow Studies Using Cfdmentioning

confidence: 99%

See 2 more Smart Citations

Multidimensional modeling of condensing two-phase ejector flow

Colarossi

Trask

Schmidt

et al. 2012

International Journal of Refrigeration

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Performance testing of a novel ejector refrigerator for various controlled conditions

Ma¹,

Zhang²,

Omer³

et al. 2010

Int. J. Energy Res.

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SUMMARYThe paper presents the experimental results of a novel ejector refrigerator that was designed to be suitable for an airconditioning application using vacuum tube solar collectors for vapour generation. The primary flow of the ejector is controlled using a spindle in order to provide fine tuning for ejector operation as heat input changes with solar radiation. Water, the most environmentally friendly substance is used as the working fluid. The performance of the ejector was tested for a range of controlled primary flows, boiler temperatures, condensation capacities using different primary nozzles with different lengths. The effect of the operating conditions and nozzle length on the performance of the ejector was analyzed. It was found that in the tested boiler temperature range of 84-961C the maximum cooling capacity (4.01 kW) of the ejector with short nozzle is much higher than that of the ejector with long nozzle (2.9 kW) on the spindle position of 21 mm. However, the ejector with long nozzle has increased COP when the boiler temperature is below 881C and has higher critical back pressure.

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Numerical assessment of steam ejector efficiencies using CFD

Cited by 153 publications

References 37 publications

Effect of suction nozzle structure on reverse circulation performance of down-the-hole hammer drill bit

Effect of suction nozzle structure on reverse circulation performance of down-the-hole hammer drill bit

Multidimensional modeling of condensing two-phase ejector flow

Performance testing of a novel ejector refrigerator for various controlled conditions

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